Arrhythmogenic right ventricular cardiomyopathy
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Arrhythmogenic right ventricular cardiomyopathy (ARVC), also referred to as arrhythmogenic right ventricular dysplasia (ARVD) or simply arrhythmogenic cardiomyopathy, is a cardiomyopathy that is one of the more common causes of sudden cardiac death in young patients.
The estimated population prevalence is thought to range around 1 in 1000-5000 8. It typically presents in young individuals. There is a recognized male predilection, with a male-to-female ratio of 2.7:1. Several reports suggest that there is a familial occurrence of ARVC of about 30-50%, with mainly autosomal dominant inheritance, various penetrance, and polymorphic phenotypic expression.
Patients with ARVC commonly present with palpitations, syncope, or sudden cardiac arrest due to their propensity for ventricular ectopy arising from the structurally abnormal right ventricle. Exertion is a common trigger for the causative ventricular tachyarrhythmias. Patients may also present with the clinical hemodynamic "congestion" component of CHF, including;
jugular venous distension
symmetric, pitting pedal edema
features most pronounced in the right precordial leads (V1-3)
subtle positive "notch" after the J point and before the T wave
localized widening of QRS complex (V1-3)
prominent, broad S wave with slurred upstroke
inversion of T waves (V1-3)
usually regular, wide (QRS duration >0.12) complex rhythms with rates between 140-250 beats per minute
typical of monomorphic ventricular tachycardia (VT)
deviation of the QRS axis in the frontal plane
often demonstrates a morphology consistent with an ectopic origin in the right ventricular outflow tract (RVOT VT)
major QRS vector travels from the base to the apex, roughly leftward and inferiorly, thus appearing predominantly positive in leads aVL (high lateral) and II, III and aVF (inferior)
may also demonstrate a left bundle branch morphology
Diagnosis is based on the presence of structural, histologic, electrocardiographic, arrhythmic, and genetic factors 4. This involves a combination of characteristic abnormalities in family history, electrocardiography, cardiac imaging as well as an endomyocardial biopsy.
Diagnostic criteria have also been developed, of which patients must have either two major criteria, one major and two minor criteria, or four minor criteria. See diagnostic criteria for arrhythmogenic right ventricular cardiomyopathy 2.
Two morphologic variants of ARVC have been reported: fatty and fibrofatty.
the fatty form is characterized by almost complete replacement of the myocardium without thinning of the ventricular wall, and it occurs exclusively in the right ventricle
the fibro-fatty variant is associated with significant thinning of the right ventricular wall, and the left ventricular myocardial wall may also be involved 1,2
Both idiopathic and familial etiologies have been proposed (see epidemiology above) 2.
As the name implies, it classically involves the right ventricle although, on autopsy studies, a sizable number of cases also show a degree of left ventricular involvement. Left dominant arrhythmogenic cardiomyopathy is a separate entity.
Chest radiographic findings are non-specific and can often be normal. May show evidence of right ventricular dilatation (best seen on a lateral view).
Echocardiography has inconsistent sensitivity and specificity for the diagnosis of ARVC and is not considered a primary modality in the final diagnosis 12.
The major echocardiographic criteria consistent with ARVC are:
regional dyskinesia, akinesia, or aneurysm of the right ventricle
with one of the below criteria also present
increased end-diastolic right ventricular outflow tract (RVOT) diameter
greater than or equal to 32 mm (parasternal long-axis measurement) 14
36 mm or greater when measured in a parasternal short-axis
respective cutoffs when corrected for body surface area are 19 and 21 mm/m2
a fractional area change of 33% or less
The minor criteria are:
regional right ventricular akinesia or dyskinesia (required)
right ventricular outflow tract diameter (measured in the parasternal long-axis) between 29 and 35 mm
a fractional area change between 34-39%
Supportive features include:
disproportionate enlargement of the basal right ventricle
secondary ("functional") tricuspid regurgitation
associated with right ventricular dilatation and dysfunction
intensely echogenic moderator band 13
May show right ventricular dilation and fatty low attenuation to the right ventricular wall.
Cardiac MRI is the most sensitive diagnostic imaging modality. Major cardiac MRI diagnostic criteria are:
regional RV akinesia or dyskinesia or dyssynchronous RV contraction and 1 of the following:
ratio of RV end-diastolic volume to BSA (body surface area) ≥110 mL/m2 (male) or ≥100 mL/m2 (female)
RV ejection fraction ≤40%
Minor cardiac MRI diagnostic criteria are:
regional RV akinesia or dyskinesia or dyssynchronous RV contraction and 1 of the following:
ratio of RV end-diastolic volume to BSA ≥100 to <110 mL/m2 (male) or ≥90 to <100 mL/m2 (female)
RV ejection fraction >40% to ≤45%
MRI may show fatty infiltration in the right ventricle (and occasionally in the left ventricle) 8, but this can also be seen in normal myocardium 3 and is no longer part of the diagnostic criteria 9. A corrugated pattern to the right ventricular wall may be seen, known as the “accordion sign.”
Focal left ventricular dyskinesia may be present with fatty infiltration within the left ventricle. MRI is also helpful in the evaluation of myocardial fibrosis and scarring.
Treatment and prognosis
ARVC is a progressive disease and will probably lead to right ventricular failure in the long term unless sudden cardiac death occurs beforehand.
Therapy is focussed on prevention of arrhythmogenesis by either pharmacologic (amiodarone or beta-blockade) or interventional (e.g. endocardial-epicardial radiofrequency ablation) means. An implantable cardioverter-defibrillator (ICD) is often placed to prevent degeneration of any future paroxysms of the abovementioned tachyarrhythmias.
Imaging differential considerations include:
right ventricular dilation due to congenital heart disease
cardiomyopathy related to neuromuscular disease
cardiac Chagas disease
congenital ventricular aneurysm
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