HOMO
SAPIENS MOLECULAR NOSOLOGY - CARDIOVASCULAR DISEASES (CVD)
Table of contents :
Epidemiology : in 2002 62 million Americans
(32 million females and 30 million males > 20%) - had a cardiovascular
disease (including hypertension). The prevalence rises progressively with
age from 5% at age 20 to 75% at age > 75 years. 8% or 22 million adults
in the US have heart disease. In the US, the prevalence rate for those
who have angina pectoris is 17.5 per 1000 people
Cardiovascular diseases (CVD) represent the first leading cause of
death in Westernized countries, accounting for 45-50% of all deaths: 35%
are
coronary artery diseases (CAD).
Contradicting conventional wisdom, the largest-ever worldwide collaborative
study of heart disease has found that women are slightly more likely to
die from CVD than men and that heart
attacks and stroke
kill twice as many women as all cancers combined. Out of the total 16.5
million CVD deaths annually, 8.6 million are of women. Although > 80% of
the global burden of cardiovascular disease occurs in low-income and middle-income
countries, knowledge of the importance of risk factors is largely derived
from developed countries. Therefore, the effect of such factors on risk
of coronary heart disease in most regions of the world is unknown.
Risk factors significantly related to acute myocardial infarction (p<0.0001
for all risk factors and p=0.03 for alcohol) include :
-
smoking (odds ratio 2.87 for current vs never, PAR 35.7% for current and
former vs never)
-
raised ApoB/ApoA1 ratio (3.25 for top vs lowest quintile, PAR 49.2% for
top four quintiles vs lowest quintile)
-
history of hypertension (1.91, PAR 17.9%)
-
diabetes mellitus
(2.37, PAR 9.9%)
-
abdominal obesity (1.12 for top vs lowest tertile and 1.62 for middle vs
lowest tertile, PAR 20.1% for top 2 tertiles vs lowest tertile)
-
psychosocial factors (2.67, PAR 32.5%)
-
daily consumption of fruits and vegetables (0.70, PAR 13.7% for lack of
daily consumption)
-
regular alcohol consumption (0.91, PAR 6.7%)
-
regular physical activity (0.86, PAR 12.2%)
These associations were noted in men and women, old and young, and in all
regions of the world. Collectively, these nine risk factors accounted for
90% of the PAR in men and 94% in women. Abnormal lipids, smoking, hypertension,
diabetes
mellitus
,
abdominal obesity, psychosocial factors, consumption of fruits, vegetables,
and alcohol, and regular physical activity account for most of the risk
of myocardial infarction worldwide in both sexes and at all ages in all
regions. This finding suggests that approaches to prevention can be based
on similar principles worldwide and have the potential to prevent most
premature cases of myocardial infarctionref.
Other cardiovascular risk factors include :
-
family history of cardiovascular accident in ancestor females before age
40 and males before age 50
Heart
diseases (cardiopathies)
-
congenital
heart diseases / cardiopathies
Epidemiology : prevalence = 0.8% of all
(alive) newborns (1 per 200).
Aetiology :
-
unknown (85%)
-
intrinsic aetiology
-
chromosome alterations (6%)
-
single gene mutations (4%)
-
Holt-Oram
syndrome (HOS) / heart-hand syndrome : autosomal heart disease
of varying severity, usually an atrial or ventricular septal defect, associated
with skeletal malformation (hypoplastic thumb and short forearm)
-
Noonan
syndrome
-
Kartagener
syndrome

-
malformations of the septum, outflow tract and aortic arch are the most
common congenital cardiovascular defects and occur in mice lacking Cited2,
a transcriptional coactivator of TFAP2.
Cited2-/- mice also develop laterality defects, including right
isomerism, abnormal cardiac looping and hyposplenia, which are suppressed
on a mixed genetic background. Cited2-/- mice lack expression
of the Nodal target genes Pitx2c,
Nodal
and Ebafin
the left lateral plate mesoderm, where they are required for establishing
laterality and cardiovascular development. CITED2 and TFAP2 were detected
at the Pitx2c promoter in embryonic hearts, and they activate Pitx2c transcription
in transient transfection assays. An abnormal Nodal-Pitx2c pathway represents
a unifying mechanism for the cardiovascular malformations observed in Cited2-/-
mice, and that such malformations may be the sole manifestation of a laterality
defectref.
-
extrinsic aetiology (< 5%)
Perloff's classification according
to the following criteria :
-
presence or absence of cyanosis

-
normal, increased or decreased pulmonary blood flow
-
normal, increased or decreased pulmonary blood pressure
-
right or left anomaly
-
right or left dominant ventricle
-
general cardiopathies
-
innocent murmurs
-
double-inlet ventricle : a
congenital anomaly in which both atrioventricular valves or a single common
atrioventricular valve open into a single ventricle, which usually resembles
the left ventricle morphologically (double inlet left v.) but may resemble
the right (double inlet right v.) or neither or both ventricles.
-
double-outlet left ventricle
: a rare anomaly in which both great arteries arise from the left ventricle;
it is often associated with a hypoplastic right ventricle, ventricular
septal defect, valvular or subvalvular pulmonic stenosis, and a variety
of associated malformations.
-
double-outlet right ventricle
:
incomplete transposition of the great vessels in which both the aorta and
the pulmonary artery arise from the right ventricle, associated with a
ventricular septal defect. The defect may be remote from or close to either
or both semilunar valves; it may be related to the aorta (subaortic), to
the pulmonary trunk (subpulmonic), to both vessels (doubly committed),
or to neither (uncommitted); and it may be associated with pulmonary stenosis.
-
congenital
complete heart block (CHB)

-
corrected
transposition of great vessels / congenitally or physiologically corrected
transposition of the great arteries / mixed levocardia (0.5% of congenital
cardiopathies) : a developmental cardiac anomaly characterized by transposition
of the great vessels with inversion of the ventricles and atrioventricular
valves; termed “corrected” because the inverted ventricles compensate for
the transposition, producing a mirror-image blood flow in the heart, ensuring
that blood flow continues in its usual physiologic pathway. However, because
in > 99% of cases this condition usually is associated with other abnormalities,
many have commented that it should not be called "corrected" .The most
common anatomic associations include a ventricular
septal defect (VSD) (80%) and the presence of pulmonary
valve stenosis (50%), and tricuspid
valve anomalies (including dysplasia, straddling, or Ebstein-like malformation
(with or without regurgitation), 14-56%). The presence of a VSD causes
a systemic-to-pulmonary shunt; however, this usually is balanced because
of the "protective" effect of coexisting pulmonic stenosis.
-
Taussig-Bing syndrome : a rare
congenital malformation of the heart characterized by transposition of
the great vessels and a ventricular septal defect straddled by a large
pulmonary artery; hemodynamically it is characterized by pulmonary hypertension,
pulmonary plethora, cyanosis, and greater O2 saturation of blood
in the pulmonary artery than in the aorta.
-
microcardia : smallness of the heart
-
cardiac or heart malposition / ectocardia
: congenital displacement of the heart, either inside or outside the thorax.
-
dextrocardia : location of the heart
in the right hemithorax, with the apex pointing to the right, occurring
with transposition (situs inversus) of the abdominal viscera, or without
such transposition (other organs are normally placed).
-
isolated dextrocardia : mirror-image transposition of the heart
without accompanying alteration of the abdominal viscera.
-
mirror-image dextrocardia : location of the heart in the right side
of the chest, the atria being transposed and the right ventricle lying
anteriorly and to the left of the left ventricle, usually associated with
complete situs inversus.
-
secondary dextrocardia : displacement of the heart to the right
as a result of disease of the pleura, diaphragm, or lungs
-
levocardia : a term denoting the normal
position of the heart, used when other viscera are transposed
-
isolated levocardia : levocardia associated with transposition (situs
inversus) of the abdominal viscera, congenital structural anomaly of the
heart, and sometimes with absence of the spleen.
-
mixed levocardia / corrected transposition of the great vessels
-
situs inversus viscerum / situs
transversus : lateral transposition of the viscera of the thorax and
abdomen; a familial pattern and consanguineous parents have been reported.
Complete transposition of the viscera in the absence of other defects is
structurally sound
Aetiology : Klinefelter's
syndrome
-
dextroversion : location of the heart in the right hemithorax, the
left ventricle remaining on the left as in the normal position, but lying
anterior to the right ventricle.
-
ectopia cordis : congenital displacement of the heart outside the
thoracic cavity because of maldevelopment of the pericardium and sternum
-
pectoral ectopia cordis : location of the heart outside the thoracic
wall, through a cleft in the lower sternum
-
ectopia cordis abdominalis : a rare anomaly in which the heart is
located in the abdominal cavity.
-
acyanotic cardiopathies
without a shunt
-
right cardiopathies
-
pulmonic valve stenosis
-
congenital pulmonic valve failure
-
idiopathic dilatation of the pulmonary trunk
-
PPH
-
acyanotic Ebstein anomaly of the tricuspid
valve
-
right ventricle hypoplasia
-
arrhythmogenic
right ventricular dysplasia (ARVD) or cardiomyopathy (ARVC) : a congenital
right-sided cardiomyopathy
Epidemiology : predominantly in young
males
Aetiology :
-
hereditary (30%; autosomal dominant) : heterozygous mutations in PKP2,
which encodes plakophilin-2, an essential armadillo-repeat protein of the
cardiac desmosomeref
-
sporadic (70%)
Pathogenesis : replacement of cardiomyocytes
by fibrous or adipose tissue (transmural in right ventricle and subepicardiac
in left ventricle) resulting in weakness, dilatation of the right ventricle,
and pseudoaneurysmal bulging of the infundibulum, apex, and posterior basilar
region of the right ventricle during systole. Cardiomyocytes entrapped
within fatty tissue are electrically unstable and can occasionally lead
to palpitations, syncope, and sometimes ventricular
tachycardia arising in the right ventricle =>
-
sudden arrhythmic cardiac death
-
dangerous tachyarrhythmias
-
contractile failure
Symptoms & signs : ARVD patients present
between the second and fifth decades of life either with symptoms of palpitations
and syncope associated with ventricular tachycardia or with SCD. There
is a wide variation in presentation and course of ARVD patients, which
can likely be explained by the genetic heterogeneity of the diseaseref
Laboratory examinations : white tissue
at
cardio-MRI
.
Diagnosis is often delayed
Therapy : once diagnosed and treated with
an implanted
cardioverter/defibrillator (ICD)
,
mortality is low
-
left cardiopathies
-
aortic valve stenosis
-
aortic valve failure
-
congenital obstruction to left atrial inflow
-
pulmonary vein stenosis
-
mitral stenosis
-
intraatrial septum in left atrium due to (cor triatriatum)
Treatment : perforation.
-
mitral valve failure
-
congenitally corrected trasnposition of the great arteries
-
anomalous origin of the left coronary artery from the pulmonary trunk
-
miscellaneous
-
double-orifice mitral valve
-
congenital perforations
-
accessory commissures with anomalous chordal insertion
-
congenitally short or absent chordae
-
cleft posterior leaflet
-
parachute mitral valve
-
bicuspid aortic valve : a congenital
anomaly of the aortic valve, caused by incomplete separation of 2 of the
3 cusps; it is generally asymptomatic early in life but is predisposed
to calcification and stenosis later on. This condition, which narrows the
passage through which blood exits the heart, can require surgery at birth.
In severe cases the heart does not develop properly in the fetus and the
child is born with an illness called hypoplastic
left heart syndrome
Aetiology : calcification of the aortic
valve is the third leading cause of heart disease in adults. The
incidence increases with age, and it is often associated with a bicuspid
aortic valve present in 1-2% of the population. Despite the frequency,
neither the mechanisms of valve calcification nor the developmental origin
of a 2, rather than 3, leaflet aortic valve is known. Mutations in the
signalling and transcriptional regulator NOTCH1
cause a spectrum of developmental aortic valve anomalies and severe valve
calcification in non-syndromic autosomal-dominant human pedigrees. Consistent
with the valve calcification phenotype, Notch1 transcripts were most abundant
in the developing aortic valve of mice, and Notch1 repressed the activity
of Runx2, a central transcriptional regulator of osteoblast cell fate.
The hairy-related family of transcriptional repressors (Hrt), which are
activated by Notch1 signalling, physically interacted with Runx2 and repressed
Runx2 transcriptional activity independent of histone deacetylase activity.
These results suggest that NOTCH1 mutations cause an early developmental
defect in the aortic valve and a later de-repression of calcium deposition
that causes progressive aortic valve diseaseref.
Complications :
-
endocardial fibroelastosis
:
diffuse patchy thickening of the mural endocardium, particularly in the
left ventricle, due to proliferation of collagenous and elastic tissue.
It usually occurs in infants without other cardiac defects, but may occur
in adolescents and adults, usually in association with congenital cardiac
malformations. Thickening and incompetence of mitral and aortic valves
is often associated. It is usually classified as dilated if the left ventricle
is enlarged and hypertrophied or contracted if the left ventricle is of
normal or reduced size.
-
primary endocrine
endocardial fibroelastosis : a congenital form of endocardial fibroelastosis,
manifest in infancy and occurring unassociated with other cardiac defects.
-
coarctation of aorta,
infantile type : a form usually seen in infants, characterized by cyanosis
and diffuse involvement of the aortic isthmus, associated with other anomalies
such as a patent ductus, due to dysharmonic body development (robust trunk
and weak lower limbs) : hyposphigmia of femoral artery (compared to radial
artery), upper arterial hypertension, costal incisions.
-
pseudocoarctation of the
aorta : an uncommon congenital anomaly of the arch of the aorta that
simulates coarctation radiographically but does not produce occlusion of
the vessel.
-
cervical aortic arch : a rare,
usually asymptomatic, congenital anomaly in which the aortic arch has an
abnormally superior location, occasionally extending to the thoracic inlet
or into the neck
-
double aortic arch : a congenital
anomaly in which the aorta divides into 3 branches which embrace the trachea
and esophagus and reunite to form the descending aorta
-
right aortic arch : a congenital
anomaly in which the aorta is displaced to the right and passes behind
the esophagus, thus forming a vascular ring that may cause compression
of the trachea and esophagus
-
acyanotic
cardiopathies with left-to-right shunt => pulmonary
arterial hypertension (PAH)
-
endocardial cushion defects : a spectrum of septal defects resulting
from imperfect fusion of the endocardial cushions :
-
septal defect : a defect in one of the cardiac septa, resulting
in an abnormal communication between the opposite chambers of the heart
-
atrioseptal or atrial septal
defect (ASD) (8-13%) : congenital cardiac anomalies in which there
is persistent patency of the atrial septum due to failure of fusion between
either the septum secundum or the septum primum and the endocardial cushions
-
isolated septal defect
-
in septum primum
-
atrioventricularis communis
/ persistent common atrioventricular canal : a congenital cardiac anomaly
in which the endocardial cushions fail to fuse, the ostium primum persists
(producing a low-lying atrial septal defect), sometimes a single atrioventricular
valve occurs which has anterior and posterior cusps, and there is commonly
a defect of the membranous interventricular septum
-
ostium primum defect (severe) is a incomplete form of atrioventricularis
communis, there is no septum at the base of the defect, between the mitral
and tricuspid valves; it is usually associated with a cleft mitral cusp
and occasionally with a cleft tricuspid valve or a ventricular
septal defect.
-
ostium secundum defect : there is a rim of septum all around the
defect
-
complete absence : common atrium or trilobated heart
-
premature closure of foramen ovale => left atrium hypoplasia =>
death at birth
-
patent foramen ovale (PFO)
-
probe patency of foramen
ovale : incomplete physical closure of the foramen ovale postnatally,
although functional closure occurs, so that a probe may be passed between
the atria in the adult. It occurs in 20 to 25% of all hearts.
Epidemiology : prevalence = 26%, but reduces
with advancing age (34.3% until third decade (3.3 mm), 20.2% at ninth decade);
commonly associated with
Aetiology : by maintaining an embryonic
right atrial flow pattern into adult life and directing the blood from
the inferior vena cava preferentially toward the interatrial septum, Chiari's
network
(found in 1.3% to 4% of autopsy studies and 2% at TEE) may favor persistence
of a patent foramen ovale (associated in 83% of cases) and formation of
an atrial septal aneurysm and
facilitate paradoxic embolismref
Pathogenesis : interatrial right-to-left
shunting during those periods of time when right atrial pressure exceeds
left atrial pressure (Valsalva maneuver, occurring physiologically during
defecation, weight lifting or pulling, strong repeated cough) =>
Therapy : despite the growing recognition
of the PFO, particularly when associated with an atrial
septal aneurysm (ASA), as risk factor for paradoxical embolism, the
optimal treatment strategy for symptomatic patients remains undefined.
Laboratory examinations :
-
contrast-enhanced transesophageal
echocardiography (TEE)
+ Valsalva maneuver
-
contrast-enhanced transcranial
echocolordoppler (TCD)
(supine patients with horizontal arms, antecubital access, 9 ml NS + 1
ml air mixed just before injection => monitor 5 seconds after injection
for 10 seconds; transit > 1 microbubble within 40") + Valsalva maneuver.
It doesn't allow differential diagnosis with shunt at other level. Higher
sensitivity with femoral vein access. Repeat if negative : the shunt may
be permanent or latent (unmasked after Valsalva maneuver)ref
-
mild shunt : 1-10 microbubbles
-
moderate shunt : 11-20 microbubbles
-
severe shunt : > 20 microbubbles (tent effect)
Prognosis : if not treated, the likelihood
of a relapse of ischemic stroke increases by 3%/yr
-
septal defect associated with ...
-
... pulmonic valve stenosis
-
... transposition of pulmonary veins
-
total transposition : the 4 pulmonary veins join into a single trunk which
drains into ...
-
supracardiac variety
-
... azygos vein
-
... brachiocephalic trunk
-
... upper cava vein
-
... left pulmonary vein, which then drains into upper cava vein
-
cardiac variety :
-
... right atrium
-
... coronary sinus
-
subcardiac variety :
-
... lower cava vein
-
... suprahepatic veins
-
mixed variety : 2 of the abovementioned varieties.
-
partial transposition
-
venous sinus-type partial transposition : the 2 right pulmonary
veins drain into upper cava vein
-
... mitral
valve stenosis (Lutembacher disease)
Epidemiology : 30% of congenital lesions in
adults
Symptoms & signs
:
Therapy :
-
antithrombotic drugs

-
percutaneous transcatheter closure
-
surgical closure
-
baffle fenestration or adjustable atrial septal defect in a modified Fontan
operation. Hemodynamic benefits include increased cardiac index and systemic
oxygen transport, as well as lower systemic venous pressure. The incidence
and duration of pleural
effusions
is also reduced by this approach. Potential complications include those
associated with the closure mechanism (snare or umbrella) as well as the
possibility of paradoxical embolism.
-
partial anomalous pulmonary venous connection
-
ventricular septal defects
(VSD) (25% of all congenital cardiopathies) : congenital cardiac anomaly
in which there is persistent patency of the ventricular septum in either
the muscular or fibrous (membranous) portions, most often due to failure
of the bulbar septum to completely close the interventricular foramen.
-
isolated septal defect (Eisenmenger
disease)
-
inlet septum
-
pars perimembranosa
-
over the crista supraventricularis (less frequent).
-
below the crista supraventricularis (more frequent).
-
pars muscularis / septum inferius (Roger
disease / maladie de Roger) : single or multiple
=> Roger murmur
-
infundibular septum
-
cushions
-
complete asbsence : univentricular heart
-
septal defect associated with ...
-
aortic regurgitation
-
left ventricular to right atrial shunt
-
...
Symptoms & signs
:
-
aortic root to right heart shunt
-
ruptured sinus of Valsalva aneurysm
-
coronary arterovenous fistula
-
anomalous origin of the left coronary artery from the pulmonary trunk
-
aortopulmonary level shunt
-
patent Botallo ductus arterious
(PDA) : while in foetus blood flows from left pulmonary artery into
aortic arc, in adult (when it doesn't undergo obliteration to create the
arterial ligament) it flows from aorta into left
pulmonary artery. Signs :
-
aortic or aorticopulmonary septal
defect / aorticopulmonary fenestration or window : a congenital anomaly
in which there is abnormal communication between the ascending aorta and
pulmonary artery just above the semilunar valves
-
multiple level shunts
-
cyanotic
cardiopathies with right-to-left (RLS) shunt
-
normal or decreased pulmonary blood flow
-
overriding aorta : a congenital anomaly
occurring in tetralogy of Fallot and
Eisenmenger
disease, in which the aorta is displaced to the right so that it appears
to arise from both ventricles and straddles the ventricular septal defect.
-
normal or decreased pulmonary blood pressure
-
dominant right ventricle : Fallot
tetralogy / "blue disease"
Pathogenesis : anomaly
of truncoconic septum => pulmonic valve
stenosis & ventricular
septal defect (VSD) => aorta communicating
with both ventricles (overriding aorta,
"knight aorta") & hypertrophy of right
ventricle
-
pseudotruncus arteriosus : the most severe form of tetralogy of
Fallot with associated pulmonary atresia in which outflow is through a
single major vessel, the aorta, accompanied by the remnant of the atretic
pulmonary artery.
-
Corvisart's disease : tetralogy of Fallot associated with right
aortic arch
Symptoms & signs
: early cyanosis
,
squatting
(decreases blood return from lower limbs and increases
pulmonary
arterial hypertension (PAH) which limits left-to-right shunt), bronchitis
(due to pulmonary hyperemia), doubling of 2nd tone.
-
dominant left ventricle
-
normal ventricles
-
increased pulmonary blood pressure
-
Eisenmenger
syndrome : ventricular septal defect with pulmonary hypertension
and cyanosis
due to right-to-left (reversed) shunt of blood. Sometimes defined as pulmonary
arterial hypertension (pulmonary vascular disease) and cyanosis
with the shunt being at the atrial, ventricular, or great vessel area.
It occurs in patients with large ...
-
... congenital cardiac ...
-
... surgically created extracardiac ...
-
10% of Blalock-Taussig anastomosis (subclavian artery
to pulmonary artery)
-
30% of Waterston anastomosis (ascending aorta to
pulmonary artery)
-
30% of Potts anastomosis (descending aorta to pulmonary
artery)
... left-to-right shunts. These shunts initially
cause increased pulmonary blood flow. Subsequently, usually before puberty,
pulmonary vascular disease causes pulmonary
arterial hypertension, ultimately resulting in reversed (right-to-left)
or bidirectional shunt flow with variable degrees of cyanosis
.
Symptoms & signs
: hypoxia => cyanosis
,
dyspnea
,
syncope
-
increased pulmonary blood flow
-
complete
transposition of great arteries or vessels (5-7% of all congenital
cardiopathies, the commonest) : a congenital cardiovascular malformation
in which the aorta arises entirely from the morphologic right ventricle
and the pulmonary artery from the morphologic left ventricle, so that the
venous return from the peripheral circulation is recirculated by the right
ventricle via the aorta to the systemic circulation without being oxygenated
in the lungs. It is incompatible with prolonged life unless mixing of oxygenated
and deoxygenated blood occurs at some anatomic level (atrial
septal defect, ventricular
septal defect, patent
ductus arteriosus (PAD))
Treatment : surgical atrial septectomy
=> balloon atrial septostomy (Blalock-Hanlon operation
: a palliative operation for transposition of the great vessels, consisting
of the creation of an interatrial septal defect) => atrial switch
(Senning operation : surgical creation of two interatrial channels
for crossing the systemic and pulmonary venous circulations in transposition
of the great vessels) => arterial switch operation / Mustard operation
: correction of transposition of great vessels by construction of an intra-atrial
baffle, composed of pericardial tissue or synthetic material, to direct
the systemic and pulmonary venous blood into the left and right ventricles,
respectively (survival rate > 90%)
-
double-outlet right ventricle of the Taussig-Bing type
-
truncus arteriosus
-
total anomalous pulmonary venous connection
-
single ventricle wthout pulmonic stenosis
-
common atrium
-
tetralogy of Fallot with pulmonary atresia
and increased collateral arterial flow
-
tricuspid atresia with large ventricular
septal defect and no pulmonic stenosis
-
hypoplastic left
heart syndrome (HLHS) : any of a group of congenital anomalies consisting
of hypoplasia or atresia of the left ventricle and of the aortic or mitral
valve or both and hypoplasia of the ascending aorta; it is characterized
by respiratory distress and extreme cyanosis, with cardiac failure and
death in early infancy. It accounts for nearly 25% of deaths among neonates
with congenital heart disease. A hypertrophic frenulum separating the alveolar
portion of the maxillary palatine suture is a markerref.
A hypothesis is proposed implicating an immune mechanism involving maternal
antibodies produced in response to pharyngitis caused by group A b-hemolytic
streptococci (GABHS) (“strep throat”). After crossing the placenta, the
antibodies injure the developing fetal heart, leading to HLHS either because
of direct injury to the LV or secondary to reduced blood flow through affected
aortic and mitral valves. Analogy is drawn to rheumatic
heart disease (RHD), a known sequela of strep throatref.
Complications : hyperuricemia, cholelithiasis,
renal failure, impaired hemostasis
Aetiology : SNPs in BMP4
can lead to atrioventricular canal defects (AVCD)
-
cardioptosis : downward displacement
of the heart.
-
cardiocoele : protrusion of the heart
through a fissure of the diaphragm or through a wound.
-
cardioplegia : arrest of contraction
of the myocardium, as may be induced by the use of
-
chemical compounds
-
cold (cryocardioplegia)
... in the performance of surgery upon the heart.
-
carditis : inflammation of the heart.
-
Lyme carditis : cardiac involvement,
generally transient, in Lyme
disease
;
it usually manifests as some degree of atrioventricular
block but ventricular tachycardia
and left ventricular dysfunction (LVD) may occur.
-
rheumatic carditis / rheumatic heart
disease (RHD) : cardiac involvement in rheumatic
fever
,
which when severe may be manifested by congestive
heart failure, progressive cardiac enlargement, pericarditis,
and significant murmurs due to valvular dysfunction.
-
streptococcal carditis : carditis
occurring as a result of streptococcal sore throat.
-
diseases of endocardium

-
endocarditis : exudative and proliferative
inflammatory alterations of the endocardium, usually characterized by the
presence of vegetations or verrucae on the surface of the endocardium (vegetative
or verrucous endocarditis) or in the endocardium itself. It may occur
as a primary disorder or as a complication of or in association with another
disease.
Localizations :
-
valvular endocarditis (most commonly) : endocarditis affecting the
membrane over the valves of the heart, rather than the mural, chordal,
trabecular, or papillary tissue
-
native valve endocarditis : infective endocarditis involving one
or more of the natural heart valves. The most affected is the mitral valve.
-
prosthetic valve endocarditis : infective endocarditis as a complication
of implantation of a prosthetic
valve
in the heart; the vegetations usually occur along the line of suture
-
ulcerative endocarditis : infective endocarditis characterized by
rapid ulceration of the valvular lesions.
-
mural or parietal endocarditis : a form affecting the lining of
the walls of the heart chambers, rather than the valvular, chordal, trabecular,
or papillary tissue
-
endocarditis chordalis : endocarditis affecting particularly the
chordae tendineae.
-
right-side endocarditis : primary acute endocarditis of the right
side of the heart.
Aetiology :
-
infectious or
infective endocarditis (IE) / malignant or septic endocarditis : endocarditis
caused by infection with microorganisms. It has been classified according
to course. Because underlying causes and available therapies have changed,
this division has little current clinical validity and has been largely
replaced by classification on the basis of etiology or underlying anatomy.
Epidemiology : incidence = 1.6÷6
cases / 100,000 / yr; male-to-female ratio 1:5; average onset at age 60;
mortality has declined since half of 1970's
Localizations : as for rheumatic endocarditis,
but right endocarditis is more common in intravenous drug addicted
-
acute bacterial
endocarditis (ABE) involves a normal heart valve, and has a short history
and rapid course (incubation : 2-5 weeks). RF
in 25-50%.
-
subacute endocarditis / endocarditis lenta (affects damaged heart
valves, and lasting 3-4 weeks or months)
-
subacute bacterial endocarditis (SBE) :
-
streptococcal endocarditis : infective endocarditis caused by streptococcal
invasion of the heart valves
-
fecal streptococci (in feces of both children and adults; nowadays
renamed Enterococcus spp.
)
-
viridans endocarditis : a subacute form of infective endocarditis
due to infection with viridans streptococci.
-
fungal or mycotic endocarditis : infectious endocarditis, usually
subacute, due to various fungi, most commonly
-
HACEK group :
-
Brucella melitensis

-
Yersinia spp.

-
Listeria monocytogenes

-
Coxiella burnetii
(rickettsial endocarditis : endocarditis caused by invasion of the
heart valves with Coxiella burnetii; it is a sequela of Q fever,
usually occurring in persons who have had rheumatic
fever
)
-
anaerobic bacteriaref
:
-
Acinetobacter spp.

-
Chlamydia spp.

-
Mycoplasma spp.

-
Treponema
pallidum subsp. pallidum
(syphilitic endocarditis : endocarditis resulting from extension
of syphilitic infection from the aorta)
-
Mycobacterium
tuberculosis
(tuberculous endocarditis : a rare form of endocarditis in which
the endocardium is involved by extension of a tuberculous perimyocarditis
or of miliary tuberculosis)
-
Suttonella indologenes

-
Tropheryma whippelii

Predisposing conditions :
-
local conditions increasing pressures and slowing blood flow => deposition
of microorganisms and platelets
-
high risk
-
intermediate risk
-
low risk
-
immunodepression
Source of infectious organisms :
-
direct implantation during diagnostic or therapeutic invasive techniques
-
hematogenous route
-
endovenous drug addiction (=> endocarditis on tricuspid valve => tricuspid
valve failure)
-
tooth extraction
-
abdominal or urinary surgery
-
respiratory infections
-
skin infections
Symptoms & signs :
-
due to systemic infection
-
due to local infection
-
dyspnea
,
chest pain, abdominal and limb pain
Morphology : few large polypoid thrombotic
vegetations consisting of fibrin, platelets, and granulocytes) : that can
embolize in early stages, ulcerations => cuspid perforation, and colonies
of microorganisms, Bracht-Wächter bodies (nonspecific inflammatory
foci of lymphocytic and mononuclear cells in the myocardium) (differential
diagnosis with nonbacterial
thrombotic endocarditis (NBTE))
Definition of infective endocarditis according to
-
Duke criteria, 1994, proposed by Durack et al.ref.
These criteria have been validated by the authors of reports of numerous
studies during the past 4 years in a wide spectrum of patients, including
children, adults, the elderly, prosthetic valve recipients, injection drug
users, nondrug users, patients in tertiary care settings, patients in primary
hospitals, and patients treated outside of the United States. When pathologically
confirmed cases were considered to be the gold standard for assessing the
Duke criteria, the collective sensitivity of the Duke criteria in numerous
studies was >80%ref.
In addition, the high specificityref
and negative predictive valueref
of the Duke criteria have been confirmed. Despite these data, the Duke
criteria have shortcomings. An often-heard criticism of the Duke criteria
is the overly broad categorization of the group "possible IE." For example,
in the original Duke criteria, an individual patient could be classified
as having "possible IE" if only 1 minor criterion was present and if the
patient did not meet requirements for "rejected IE." To "reduce the size
of this possible group and to amplify the size of the rejected group,"
Bayerref
recently called for a "diagnostic floor" for the group of patients listed
as "possible IE." Other critics have suggested the modification of currentref
or the inclusion of additional minor criteriaref
to increase the sensitivity of the Duke criteria. Finally, issues such
as the relative risk of IE in cases of Staphylococcus aureus bacteremiaref1,
ref2,
the poor diagnostic sensitivity in suspected cases of Q-fever IEref,
and the relative role of transesophageal echocardiography (TEE) in the
diagnosis of IEref1,
ref2,
ref3
remain unresolved.
-
modified Duke criteria, 2000, with modifications shown in Italicsref
:
-
definite infective endocarditis
-
pathologic criteria
-
microorganisms demonstrated by culture or histologic examination of a vegetation,
a vegetation that has embolized, or an intracardiac abscess specimen; or
-
pathologic lesions; vegetation or intracardiac abscess confirmed by histologic
examination showing active endocarditis
-
clinical criteria
-
2 major criteria; or
-
1 major criterion and 3 minor criteria; or
-
5 minor criteria
-
possible infective endocarditis
-
1 major criterion and 1 minor criterion; or
-
3 minor criteria
-
rejected :
-
firm alternate diagnosis explaining evidence of infective endocarditis;
or
-
resolution of infective endocarditis syndrome with antibiotic therapy for
4 days; or
-
no pathologic evidence of infective endocarditis at surgery or autopsy,
with antibiotic therapy for 4 days; or
-
does not meet criteria for possible infective endocarditis, as above
Major criteria :
-
blood culture positive for IE (time for PCR introduction ?ref)
-
typical microorganisms consistent with IE from 2 separate blood cultures:
-
viridans streptococci, Streptococcus bovis, HACEK group, Staphylococcus
aureus; or
-
community-acquired enterococci, in the absence of a primary focus; or
-
microorganisms consistent with IE from persistently positive blood cultures,
defined as follows:
-
at least 2 positive cultures of blood samples drawn >12 h apart; or
-
all of 3 or a majority of 4 separate cultures of blood (with first and
last sample drawn at least 1 h apart)
-
single positive blood culture for Coxiella burnetii or antiphase I IgG
antibody titer >1 : 800
-
evidence of endocardial involvement
-
echocardiogram positive for IE (transesophageal echocardiography recommended
in patients with prosthetic valves, rated at least "possible IE" by clinical
criteria, or complicated IE [paravalvular abscess]; transthoracic echocardiography
as first test in other patients), defined as follows :
-
oscillating intracardiac mass on valve or supporting structures, in the
path of regurgitant jets, or on implanted material in the absence of an
alternative anatomic explanation; or
-
abscess; or
-
new partial dehiscence of prosthetic valve
-
new valvular regurgitation (worsening or changing of pre-existing murmur
not sufficient)
Minor criteria :
-
predisposition, predisposing heart condition or injection drug use
-
fever, temperature >38°C
-
vascular phenomena, major arterial emboli, septic pulmonary infarcts, mycotic
aneurysm, intracranial hemorrhage, conjunctival hemorrhages, and Janeway's
lesions

-
immunologic phenomena: glomerulonephritis, Osler's
nodes
,
Roth's spots, and rheumatoid factor
-
microbiological evidence: positive blood culture but does not meet a major
criterion as noted above (excludes single positive cultures for coagulase-negative
staphylococci and organisms that do not cause endocarditis) or serological
evidence of active infection with organism consistent with IE
-
echocardiographic minor criteria eliminated
Complications :
Therapy & prophylaxis
before minor and major surgery : antibacterial
drugs
.
Prognosis :
-
lethality : 40%.
-
recovery when treated
-
organization of thrombi => joining of edges => nastriform calcified masses
on edges after years
-
rheumatic endocarditis : endocarditis
associated with rheumatic
fever
.
Involvement may be mural but is usually valvular and involves the entire
valve; it is then more accurately termed rheumatic valvulitis, characterized
by valvular edema, numerous small, erosions and translucent vegetations
(1-3 mm "warts" or protrusions of connective tissue covered by fibrin and
platelets) located as a rosary chain on the edges of the valve cusps along
the lines of closure and chordae tendinae. As vegetations are well-anchored,
they don't embolize
Localizations : mitral valve (alone or
with aortic valve) (90%) > isolated aortic valve > mitral, aortic and tricuspid
valves > mitral and tricuspid > tetravalvulitis
Pathogenesis : after 1 year => retracting
fibrosis (fibroplastic endocarditis) => stiffening and joining of
commissurae
-
nonbacterial
thrombotic endocarditis (NBTE) / marantic endocarditis : endocarditis
characterized by noninfected vegetations composed of fibrin and other blood
elements, generally located on the line of closure of the mitral and aortic
valves and susceptible to embolization.
Aetiology : chronic debilitating disease
-
cancers

-
Libman-Sacks disease or endocarditis
/ atypical or nonbacterial verrucous endocarditis or carditis / endocarditis
benigna : NBTE associated with systemic
lupus erythematosus and occasionally in scleroderma
,
thrombotic
purpura
,
and other collagen diseases; the vegetations (whose size is intermediate
between that of rheumatic and infectious
endocarditis) consist of necrotic nuclear debris (hematoxylinophilic
bodies), fibrinoid
degeneration
,
and trapped, disintegrating, fibroblastic and inflammatory cells and are
located on the edges of the valve cusps along the lines of closure, on
chamber walls and chordae tendinae
Localizations : tricuspid valve > tricuspid
+ mitral valves > tricuspid + pulmonary valves
Pathogenesis : => fibrosis (as for rheumatic
endocarditis)
-
thromboendocarditis : a term formerly used for nonbacterial thrombotic
endocarditis or sometimes incorrectly for nonbacterial verrucous endocarditis.
-
Löffler's
parietal fibroplastic endocarditis / constrictive endocarditis / eosinophilic
endomyocardial disease : endocarditis associated with eosinophilia,
marked by fibroplastic thickening of the endocardium, and resulting in
congestive heart failure, persistent tachycardia, hepatomegaly, splenomegaly,
serous effusions into the pleural cavity, edema of the legs, and edema
and ascites of the arms
Laboratory examinations :
-
diseases of heart
valves
/ valvulopathies
-
cardiovalvulitis : inflammation of the valves of the heart.
-
failure
-
stenosis
-
restenosis : recurrent stenosis, especially of a valve of the heart,
after surgical correction of the primary condition.
-
false restenosis : stenosis recurring after failure to divide either
commissure of the cardiac valve beyond the area of incision of the papillary
muscles.
-
true restenosis : restenosis occurring after complete opening of
one or both of the commissures of the cardiac valve involved.
-
diseases of atrioventricular valves
-
diseases of mitral
valve
ref
-
mitral stenosis (MS)
-
buttonhole or fishmouth mitral stenosis / mitral buttonhole : an
advanced state of mitral stenosis in which adhesion and shortening of the
mitral cusps produces a diaphragmatic slit resembling a buttonhole
Epidemiology : female:male ratio 3:1.
Aetiology :
-
rheumatic fever
: complete calcification of a rheumatic left atrium was first described
in 1898, in association with chronic rheumatic mitral disease, and is more
common in women, most of whom have symptoms for > 20 years. The condition
is assumed to be the end result of extensive rheumatic pancarditis. The
calcification may be confined to the left atrial appendage or, rarely,
to the posterior left atrial wall — owing to a regurgitant mitral jet —
in which case the calcified patch is called the MacCallum's patch.
Massive calcification usually spares the interatrial septum, but when the
septum is affected, any further surgery near the mitral valve is hazardous.
Radiography of the left lateral side of the chest is recommended to assess
long-standing rheumatic mitral-valve disease. Complete calcification has
been described as a "coconut atrium" or "porcelain atrium"ref
-
thromboembolism
-
atrial myxoma
-
bronchial
carcinoid

Pathogenesis => symptoms
: fusion of valve commissures, fibrotic and calcified cuspids, shortened
chordae tendinea =>
-
A normally 4 cm2
-
A = 2-4 cm2 (mild stenosis)
-
A = 1.3-2 cm2 (moderate stenosis)
-
A < 1.3 cm2 (severe stenosis) => surgery
symptomatic if A < 1 cm2 => decreased AV flow => atrial hypertension
=> left heart failure (exercise intolerance
(tachycardia), AT and AF
=> arterial thromboembolism, bitonal voice
due to compression of left lower laryngeal / recurrent nerve, cyanotic
mitralic facies; rarely myocardium ischemia)
=> pulmonary arterial hypertension
(PAH) (=> hemoptysis
,
dyspnea,
acute
pulmonary edema if A < 0.7 cm2).
Signs :
Therapy:
-
asymptomatic (NYHA dyspnea class I or II) : echocardiography
every year and medical therapy
-
symptomatic (NYHA dyspnea class III or IV, thromboembolism, AF,
A < 1.2 cm2, tachycardia) :
-
diuretics for heart failure; digoxin, b-blockers
,
and rate-limiting calcium antagonists for rate control in AF
-
conservative surgery (divulsion, commissurotomy or ballooned valvuloplasty)
or valve replacement

Secondary prevention : penicillin prophylaxis
against recurrent episodes of rheumatic fever; anticoagulants to prevent
systemic thromboembolism
-
mitral failure or regurgitation (MR)
Aetiology :
-
acute => atrial compliance doesn't increase
-
chronic => increased atrial compliance
-
congenital : fenestrated mitral valve
-
inflammatory
-
degeneration
-
infections : bacterial endocarditis in carriers of valve prostheses or
after cardiosurgery in elderlies
-
structural impairment
-
dilatation of left ventricle
-
dyskinesia of papillary muscles and chordae tendinea
-
thromboembolism
-
annular dilatation
-
thickened leaflets
-
flail mitral valve : a mitral valve having a cusp that has lost
its normal support (as in ruptured chordae tendineae) and flutters in the
blood stream
-
redundant leaflets with abnormal coaptation
-
papillary muscle rupture
-
papillary muscle dysfunction
-
annular calcification
-
paraprosthetic leak
Symptoms are those due to AF,
pulmonary
arterial hypertension (PAH), dyspnea, acute
pulmonary edema, and right
ventricle failure
Signs :
Carpenter classification :
-
type I (fig.a) : normal leaflet, normal chordal motion; annular
dilatation due to dilatated cardiomyopathy
-
type II (fig. b) : leaflet prolapse, excessive chordal motion = mitral
valve prolapse (MVP) syndrome / Barlow's disease or syndrome / floppy mitral
valve syndrome / midsystolic click–late systolic murmur syndrome / systolic
click–murmur syndrome
Epidemiology : prevalence = 5% of population
(females > males)
Pathogenesis : myxomatous proliferation
of the leaflets of the mitral valve
-
too large leaflets
-
too long chordae tendinea
-
ischemia of papillary muscles
Symptoms : often asymptomatic. Palpitations
and chest discomfort may occur
Signs on auscultation :
Treatment : in some cases progressive mitral
regurgitation necessitates valve replacement (redundancy or hooding of
mitral valve leaflets so that they prolapse into the left atrium, often
causing mitral regurgitation), conservative (asportation of part of the
strip(s) and suture of the remaining part, shortening of chordae tendinea
by inserting them back into papillary muscles, solid ring) or prosthetic
surgery.
-
type III (fìg. c) : restricted leaflet or restricted chordal
motion
Therapy :
|
0
|
1
|
2
|
| symptoms (NYHA class) |
absent |
I/II |
III/IV |
| EF% |
> 60 |
50-60 |
< 50 |
| ESD [mm] |
< 40 |
40-45 |
> 45 |
| factibility |
absent |
possible |
sure |
Overall score :
-
0-1 : dilatation, clinical follow-up, echocardiography
every 12 months
-
2 : borderline, clinical follow-up, echocardiography
every 6 months
-
3-6 : surgery
-
asymptomatic (NYHA dyspnea class I or II) :
-
normal heart => echocardiography
every 6-8 months
-
dilated or hypokinetic heart => cardiac catheterism and coronarography
if age > 40
-
EF > 25-30% => conservative (valvuloplastic with insertion of solid ring
or suture) or prosthetic surgery.
-
EF < 25-30% => medical therapy (diuretics and vasodilators (usually
ACEIs) for heart failure; nitrates and b-blockers
for angina), valve
replacement
,
or heart transplantation
-
symptomatic (NYHA dyspnea class III, tachyarrhythmia, AF) => transesophageal
echocardiography (TEE)
(echocolordoppler
may be expecially useful)
Secondary prevention : no proven treatment
-
mitral valve stenofailure
Aetiology :
-
diseases of tricuspid
valve

-
tricuspid stenosis (TS)
Signs :
-
tricuspid failure or regurgitation
(TR)
If mild it can be considere paraphysiological.
Aetiology : gastrointestinal
carcinoid
Signs :
Treatment : cardiac catheterism + right ventriculography
=>
-
functional failure =>
-
mild => no need for surgery
-
severe =>
-
organic failure => conservative surgery or valve
replacement

-
combined disease
-
diseases of semilunar valves
-
diseases of aortic
valve
ref
-
aortic stenosis (AS)
Aetiology :
Grading :
-
normal transvalvular pressure gradient < 4 mmHg
-
50-60 mmHg : moderate stenosis
-
> 80 mmHg : severe stenosis
Varieties :
-
valvular aortic stenosis : congenital,
bicuspid aortic valve, rheumatic fever, senile fibrocalcification
-
supravalvular aortic stenosis
: a rare form of aortic stenosis occurring above the aortic valve, usually
caused by a complete circumferential fibrous ring of constricting tissue
at the level of the sinus of Valsalva => Williams-Beuren
syndrome / elfin facies syndrome

-
subaortic or
subvalvular aortic stenosis : aortic stenosis due to an obstructive
lesion in the left ventricle below the aortic valve, causing a pressure
gradient across the obstruction within the ventricle
-
due to hypertrophic cardiomyopathy
Sudden onset.
Symptoms & signs :
Laboratory examinations : widespread use of
catheterisation to assess the extent of aortic-valve stenosis could increase
the risk of cerebral blood clotting and brain damage
Therapy :
-
A < 0.75 cm2 / m2BSA => DPtransvalvular
> 50 mmHg : aortography, coronarography
if age > 40 years
-
A > 0.75 cm2 / m2BSA => DPtransvalvular
< 50 mmHg
=> conservative (divulsion, commissurotomy or ballooned valvuloplasty)
or valve replacement
(indicated also for women planning a pregnancy) + ventriculoplasty (if
post-ischemic) to prevent aCHF
Complications : type
2 acquired von Willebrand's disease / von Willebrand's syndrome
=> slatentization of intestinal
angiodysplasia (IA)
(Heyde's syndrome)
Secondary prevention : no proven treatment
but lipid-lowering therapy may slow progression of calcific aortic stenosis
-
aortic failure, insufficiency or
regurgitation (AR)
Aetiology :
-
alterations of cuspids
-
annuloaortic ectasia : dilatation
of the proximal aorta and the fibrous ring of the heart at the aortic orifice,
marked by aortic regurgitation and, when severe, by dissecting
aneurysm
-
loss of support : subaortic ventricular
septal defect (VSD)
-
quadricuspid aortic valve
Pathogenesis : myocardial hypertrophy compensatory
of left ventricular volume overload
Symptoms & signs :
-
diastolic regurgitation
murmur

-
presystolic
or atriosystolic murmur

-
Traube's sign / pistol-shot sound : a loud sound like a pistol shot
heard in auscultation over the femoral arteries in aortic regurgitation
-
Hill's sign : disproportionate femoral systolic hypertension, seen
in aortic regurgitation and certain other conditions involving increased
stroke volume.
-
results of markedly increased stroke volume :
-
Quincke's pulse :
-
Müller's sign : a sign of aortic insufficiency consisting of
pulsation, or bobbing, of the uvula and redness of the tonsils and velum
palati during systole, infrequently seen with severe or sudden-onset aortic
regurgitation. In some patients, the pulsation extended to the soft palate
and posterior oropharynxref
-
Musset's sign : rhythmical jerking movement of the head; seen in
cases of aortic aneurysm and aortic insufficiency.
Treatment : carotideal doppler if age > 65
=>
-
normal heart, asymptomatic, intermediate failure => control every 6-8 months
-
enlarged heart, severe failure =>
-
asymptomatic
-
normal EF => control every 3 months
-
decreased EF =>
-
symptomatic => aortography, cardiac catheterism, coronarography
=>
-
EF > 25 % => surgery
-
EF < 25 % => echocardiography
with dobutamine
-
negative => diuretics and vasodilators (usually ACEIs) for heart failure;
valve
replacement
and eventually heart reduction or transplantation
-
positive => surgery
Secondary prevention : vasodilators (nifedipine
or ACEIs) to protect the left ventricular myocardium and delay the need
for surgery
-
combined disease
-
diseases of pulmonic valve

-
pulmonary stenosis
-
subinfundibular
-
infundibular stenosis : stenosis
below the pulmonary valve, within the infundibulum (conus arteriosus) of
the right ventricle of the heart.
-
valvular
-
supravalvolar (stenosis of pulmonary artery and its branches))
Aetiology : gastrointestinal
carcinoid
Signs :
-
pulmonary failure
If mild it can be considere paraphysiological.
Symptoms & signs : diastolic
regurgitation murmur
-
combined disease
-
multiple valvulopathies
-
diseases of myocardium
/ cardiomyopathies : a general diagnostic term designating primary
noninflammatory disease of the heart muscle, often of obscure or unknown
etiology and not the result of ischemic, hypertensive, congenital, valvular,
or pericardial disease.
Diagnosis : EKG
.
Aetiology and pathogenesis
-
myocardial contusion : contusion
of the heart, most frequently due to impact against an automobile steering
wheel or other blunt object; the trauma may cause arrhythmias,
conduction disturbances, or clinical signs of acute
myocardial infarction such as electrocardiographic abnormalities.
-
idiopathic or primary cardiomyopathies : those disorders in which
the pathological process involves solely the myocardium and in which the
cause is unknown and not part of a disease affecting other organs
-
idiopathic
-
familial or intrinsic aetiology (20-50%; 68% between age 1 and 19)
-
mutations in cardiomyocyte-expressed genes (=> direct damage)
-
sarcomere proteins
-
cytoskeleton proteins
-
energy metabolism proteins
-
mutations in modifier genes
-
altered expression of normal genes
-
secondary cardiomyopathies : any form that is due to another cardiovascular
disorder (e.g., systemic arterial
hypertension) or is a manifestation of systemic disease (e.g., sarcoidosis
).
-
sporadic
-
arrhythmias
HR varies physiologically during respiration (up to 5% during normal
respiration, up to 30% during deep respiration).
If HR < 60 bpm in an adult : bradycardia
-
central bradycardia : bradycardia dependent on disease of the CNS
-
fetal bradycardia : a fetal heart rate (FHR) < 120 beats per
minute, generally associated with hypoxia; it is usually due to placental
insufficiency; it may also result from placental transfer of local anesthetics
or beta-adrenergic blocking agents, and rarely from heart block associated
with congenital heart disease or maternal collagen vascular disease.
-
nodal bradycardia : bradycardia in which the stimulus of the heart's
contraction arises in the atrioventricular node or common bundle.
-
postinfective bradycardia : bradycardia occurring after infectious
disease.
-
essential bradycardia : bradycardia occurring without discoverable
cause.
-
Branham's bradycardia or sign : bradycardia produced by digital
closure of an artery proximal to an arteriovenous fistula.
If HR > 100 bpm in an adult : tachycardia
-
atrioventricular reciprocating tachycardia (AVRT) : a reentrant
tachycardia in which the reentrant circuit contains both the normal atrioventricular
nodal to His bundle pathway and an accessory pathway as integral parts
-
antidromic atrioventricular (AV) reciprocating tachycardia : a reentrant
tachycardia in which the reentrant circuit involves anterograde conduction
over the accessory pathway and retrograde conduction over the normal AV
node to His bundle pathway
-
orthodromic atrioventricular (AV) reciprocating tachycardia : a
nodal reentrant tachycardia in which the reentrant circuit involves anterograde
conduction over the usual AV node to His bundle pathway and retrograde
conduction over an accessory pathway
-
double tachycardia : the occurrence of 2 types of ectopic tachycardia,
e.g., nodal and ventricular tachycardia, at the same time.
-
ectopic tachycardia : abnormally rapid heart action in response
to impulses arising outside the sinoatrial node.
-
orthostatic tachycardia : disproportionate rapidity of the heart
rate on rising from a reclining to a standing position.
-
pacemaker-mediated tachycardia / endless loop tachycardia : in patients
with dual chamber pacemakers, tachycardia caused by retrograde conduction
of ventricular impulses, either premature ventricular complexes or impulses
triggered by ventricular pacing which are sensed by the atria and trigger
a subsequent ventricular impulse; an endless loop may develop
-
paroxysmal tachycardia : a condition marked by attacks of rapid
action of the heart having sudden onset and cessation. It is usually qualified
by the locus of impulse origin as either ventricular or supraventricular;
some classifications subdivide the latter into atrial and junctional tachycardias.
-
reciprocating tachycardia : a tachycardia due to a reentrant mechanism
and characterized by a reciprocating rhythm
-
reentrant tachycardia / circu