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ISSN: 2157-7099
Journal of Cytology & Histology
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Arrhythmogenic Right Ventricular Cardiomyopathy and Heart Transplantation: Two Cases

Gesaro GD1*, Minà C1, Ruperto C1, Liotta R2, Scardulla C1 and Clemenza F1

 

1Cardiology Unit, Department for the Study and Treatment of Cardiothoracic Diseases and for Cardiothoracic Transplants, IRCCS - ISMETT, Palermo, Italy

2Pathology Unit, Department of Diagnostic and Therapeutic Services, IRCCS - ISMETT, Palermo, Italy

*Corresponding Author:
Gesaro GD
Cardiology Unit, Department for the Study
and Treatment of Cardiothoracic Diseases
and for Cardiothoracic Transplants
IRCCS-ISMETT, Palermo, Italy
Tel: +393294225215
Fax: +390912192400
E-mail: [email protected]

Received Date: November 20, 2015 Accepted Date: January 07, 2016 Published Date: January 09, 2016

Citation: Gesaro GD, Minà C, Ruperto C, Liotta R, Scardulla C, et al. (2016) Arrhythmogenic Right Ventricular Cardiomyopathy and Heart Transplantation: Two Cases. J Cytol Histol 7:388. doi:10.4172/2157-7099.1000388

Copyright: © 2016 Gesaro GD, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Abstract

Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a myocardial disease characterized by fibrofatty replacement. The main clinical features are sudden death due to ventricular arrhythmias and congestive heart failure. Diagnosis of ARVC is still problematic and frequently made only by autopsy. Criteria for orthotropic heart transplant (HTx) have still not well been defined. We present two cases of arrhythmogenic right ventricular cardiomyopathy who underwent heart transplant. They demonstrate that heart transplant can be a real therapeutic option for these patients and offer to us the possibility to confirm the diagnosis and better understand pathological and histological features of the disease.

Keywords

Heart Transplantation; Heart failure; Cardiomyopathy; Cardiac anatomy/pathologic anatomy; Heart failure operations

Case Report

Case 1

This is a 62 years-old-male affected from 1987 by ARVC characterized by recidivant episodes of supraventricular and ventricular tachycardia treated with amiodarone, cardioverter defibrillator implantation and transcatheter ablation over time.

In March 2011 he was admitted in our institution for dyspnea after mild effort and signs of right heart decompensation (hepatomegaly, jugular distension and peripheral edema). He has optimized the medical treatment with the increase of amiodarone dose to 300mg die and the increase of furosemide to 175 mg die. So he started evaluation for heart transplant. The electrocardiogram showed bradycardia and the characteristic epsilon waves (Figure 1). NT-pro-BNP was 1624 pg/ml. Right heart catheterization (RHC) showed: pulmonary artery pressure 26/16/20 mmHg, right atrium pressure: 19 mmHg, pulmonary capillary wedge pressure: 17 mmHg, right ventricle (RV) mean pressure: 17 mmHg, cardiac output: 3,5 l/min, cardiac index: 1,8 m/l/m2. At echocardiogram right ventricle resulted dilated and severely hypokinetic with apical trabeculae and hyper-reflective moderator band. Tricuspid valve had a severe regurgitation with slow velocity (1,3 m/sec). Left ventricle (LV) was mildly dilated with ejection fraction 40%. Based on history of recidivant ventricular tachycardia and right ventricular failure with left ventricle dysfunction he entered in our heart transplant waiting list and underwent HTx in August 2011 with regular post-operative course. The explanted heart examination confirmed the clinical diagnosis of ARVC.

cytology-histology-atrial-fibrillation

Figure 1: ECG: Atrial fibrillation, epsilon waves in right precordial leads and inverted T waves in V1-V5.

Gross examination revealed right ventricular dilatation. Right ventricle outflow tract appeared enlarged and transillumination highlined the wall thinning and the almost total fibro-fatty replacement of the myocardium. Focal areas of endocardial fibrosis were seen in both ventricles.

Microscopic examination revealed transmural adipose infiltration with hypertrophic and degenerated myocytes. Subendocardial fibrosis was also seen. Similar pathological findings, although of smaller extension, were also detected in left ventricle (Figure 2).

cytology-histology-right-ventricle

Figure 2: Right ventricle outflow tract wall thinning at transillumination (panel A). Total fibro-fatty replacement of right ventricular myocardium (panel B-C)

Case 2

This is a 43-year-old female with a past diagnosis of post-partum cardiomyopathy (1994) characterized by episodes of non-sustained VT. In 2009 an echocardiography showed severe dilatation and systolic dysfunction of the right ventricle (FAC 25%; TAPSE 13 mm) with aneurysmatic areas and diastolic bulging of apex and infero-lateral wall. Left ventricle was dilated and hypo-akinetic (EF 33%) too. Cardiac magnetic resonance (MRI) confirmed our suspicious of ARVC with biventricular involvement and evidence of fibrosis of right ventricle and of basal and median segment of anterolateral and inferior wall. Implantable cardioverted-defibrillator (ICD) implantation was performed. Many episodes of cardiac decompensation occurred so she was hospitalized for heart transplant work up. At RHC we founded: pulmonary artery pressure: 38/18/28 mmHg, right atrium pressure: 10 mmHg, pulmonary capillary wedge pressure: 24 mmHg, cardiac index 1.9 L/min/mq while cardiopulmonary exercise test showed a low maximal oxygen consumption (10.4 mL/kg/min).

Considering hemodynamic instability with end-stage biventricular failure, NYHA class III, despite maximal tolerated therapy with furosemide 50 mg, carvedilol 12,5 mg, losartan 50mg, spironolactone 25mg and amidarone 200mg, she was inserted in waiting list and, on 3 April 2012 was transplanted. Post-operative course was regular. The findings of ARVC were founded at anatomo-pathological examination (Figure 3). Explanted heart examination revealed a dilated and thinwalled right ventricle. Especially in the infero-basal region and in the apex, the RV wall was translucent, extremely thinned (apical wall thickness 1 mm) and infiltrated by adipose tissue. In LV fibrofatty replacement of myocardium was limited to posterior wall while in lateral wall a focal two-layered area with an epicardial compacted and a thick endocardial non-compacted layer was described. Microscopic examination showed a severe degeneration of myocytes, repaired by fibro-fatty replacement.

cytology-histology-transmural

Figure 3: Panel A: Transmural fibrofatty replacement in infundibulum. Panel B: A focal area of adipose infiltrate/infiltration in left ventricular posterior wall (arrows) and diffuse adipose substitution in right ventricular wall (arrowheads). Panel C, D: Transmural adipose infiltration with degenerated and hypertrophic myocytes.

Discussion

Arrhythmogenic right ventricular cardiomyopathy/dysplasia is an heart muscle disease that predominantly affects the right ventricle and predisposes to ventricular arrhythmias, sudden cardiac death and heart failure [1-4].

Despite the modified Task Force criteria [5], diagnosis of ARVC is still problematic and often made only by pathological examination during autopsy after unexplained sudden death. Cardiac MRI allows to characterize structural abnormalities [6] but its use is limited by ICD implantation. The growing knowledge regarding arrhythmic outcome, risk factors, and life-saving therapeutic interventions, make it particularly timely to critically address and place into perspective the issues relevant to the clinical management of ARVC/D patients [7].

Natural history and prognostic predictors are also not well understood [8,9]. Some patients are asymptomatic with typical RV structural changes and can experience sudden death, some other develop signs of right congestive ventricular failure. End stage biventricular failure can also occur in selected cases. The frequency of progression to heart failure is actually still unknown [10].

At the best of our knowledge, indications and timing of transplantation for ARVC are lack and only few cases are described in literature [11,12]. Refractory RV failure, LV involvement and recurrence of ventricular arrhythmias had been recognized as prognostic predictors. These subsets of patients should be considered as cardiac transplant candidates.

We presented two cases of ARVC with different clinical and anatomo-pathological pictures. The first patient had severe RV heart failure with mild LV involvement and persistent electrical instability, despite drug therapy, for which he had been subjected to repeated ablation procedures. The clinical picture of the second patient was instead characterized by refractory congestive heart failure with biventricular involvement. Our cases demonstrate that Heart transplant is a real therapeutic option and offer to us the possibility to confirm the diagnosis and better understand pathological features of the disease.

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