Printer Friendly

Noncompaction of the ventricular myocardium with tetralogy of Fallot/Fallot tetralojisi ile "noncompacted" ventrikuler miyokard.

Introduction

Noncompaction of the ventricular myocardium (NVM) is a rare congenital unclassified cardiomyopathy. It is caused by a defect in cardiac morphogenesis resulting in an arrest of compaction of loose interwoven meshwork of myocardial fibers during intrauterine life (1). It can result with severe systolic dysfunction as well as hypertrophy of the involved walls of the ventricles (2). It is diagnosed both in children and adults. Currently, the incidence of this rare cardiomyopathy is estimated 0.05% in adults (3). The disorder is usually diagnosed by two-dimensional echocardiography. It can be seen in patients with other congenital anomalies or in isolated form in the absence of associated anomalies (4). We describe an illustrative case of NVM, a 22-year-old male with tetralogy of Fallot (TOF) and progressive worsening of heart failure.

Case report

A 22-year-old man was evaluated at the outpatient clinic for dyspnea and weakness on exertion. He had TOF and Blalock-Taussig shunt was done 12 years ago. There was a history of sudden cardiac death (his father and brother) in his family. Mild cyanosis, protodiastolic gallop, apical 4/6 systolic murmur, hepatomegaly and jugular venous pulse were revealed on physical examination. Patient systolic/diastolic blood pressures and heart rate were 110/70 mmHg and 102 beats/min respectively. Sinus tachycardia and nonspecific interventricular conduction delay (QRS duration 140 ms) with a right heart axis were seen on electrocardiography. Cardiomegaly without pulmonary congestion and dextraposition of the aorta were revealed on the telecardiography. Two-dimensional transthoracic echocardiography showed dextraposition of aortic root, large membranous ventricular septal defect resembling a single ventricle (Fig. 1), infundibular pulmonary stenosis (gradient 20/14 mmHg), mild mitral regurgitation and severe tricuspid regurgitation (right ventricular (RV) systolic pressure 108 mmHg) and biventricular global hypokinesia (left ventricular (LV) ejection fraction %25, RV ejection fraction %30). The LV, RV end-diastolic and left atrial diameters were 63, 46 and 47 mm respectively. The left and right ventricles appeared to have concentric hypertrophy with multiple, prominent myocardial trabeculations and deep intertrabecular recesses communicating with the main ventricular cavity (Fig. 2 and 3). The end-systolic ratio of noncompacted to compacted myocardium was greater than 2:1. Accordingly, diagnosis of NVM was established. Left and right-sided heart catheterization was performed (systolic/diastolic pulmonary artery pressure 98/36 mmHg, RV pressure 114 mmHg, right atrial pressure 9 mmHg, pulmonary capillary wedge pressure 22 mmHg and pulmonic flow/systemic flow ratio: 1.1). The patient was taken under medical therapy (including silazapril 5 mg/d, carvedilol 6.25 mg/d, aspirin 150 mg/d, furosemid 20 mg/d and spironolacton 50 mg/d) and he is currently being evaluated for heart and lung transplantation.

[FIGURES 1-3 OMITTED]

Discussion

Myocardial noncompaction is a rare form of cardiomyopathy due to an arrest in endomyocardial embryogenesis (5). Noncompacted ventricular myocardium may be associated with other congenital anomalies, such as obstruction of the right or left ventricular outflow tracts, complex cyanotic congenital heart disease, and coronary artery anomalies (6,7). Pressure overload or myocardial ischemia in these secondary cases of myocardial noncompaction may prevent the normal regression of embryonic myocardial sinusoids. However, currently it is unclear whether the isolated and secondary forms of noncompaction are common or distinct lesions.

In the present case, NVM was associated with TOF and although the outflow tract obstruction was in the RV, both of the ventricles were affected by noncompaction. The patient had a low gradient in the right outflow tract and pulmonary hypertension. This hemodynamic situation is very rare in a TOF and low RV ejection fraction and/or increased pulmonary vascular resistance may be the reasons.

Both familial and sporadic forms of NVM have been described. Familial recurrence was seen in half of patients (4). Likewise, sudden cardiac death occurrences existed in his family history. In X-linked form of the disease, a locus has been found on Xq28, and mutations have been reported in G4.5 gene (4).

Noncompacted ventricular myocardium is usually detected by echocardiography and confirmed by cardiac magnetic resonance imaging. The characteristic echocardiographic findings consist of multiple, excessively prominent myocardial trabeculations and deep intertrabecular recesses perfused from the ventricular cavity, commonly involving the apical and mid-ventricular segments of the left ventricle (8).

Prominent myocardial trabeculation can be found in healthy hearts as well as in hypertrophic myocardium secondary to cardiomyopathies, valvular heart disease or hypertension. Thus, the differentiation between variants and NVM may often be challenging. An end-systolic ratio of non-compacted to compacted layers of >2 is diagnostic for NVM and allows differentiation of the trabeculations of NVM from that observed with dilated cardiomyopathy or hypertensive cardiomyopathy (9). In addition, evidence of direct blood flow from the ventricular cavity into deep intertrabecular recesses by colour Doppler echocardiography is one of the hallmarks of the diagnosis of NVM. This feature is clearly never been observed in other forms of LV hypertrophy (9).

In our case, echocardiography revealed biventricular dilatation with severely impaired systolic function. Characteristic, multiple, prominent muscular trabeculations were present in the both of the ventricles. The end-systolic ratio of noncompacted to compacted myocardium was greater than 2:1. Deep intertrabecular spaces communicating with the main ventricular cavity were evident on both two-dimensional and colour flow imaging. These findings were pathognomonic for NVM.

The clinical manifestations include congestive heart failure signs, arrhythmias and cardiac embolic events. The most common presentation is congestive heart failure, as in our case. Prognosis is poor and the common causes of death are intractable heart failure and sudden cardiac death (10). The end-stage congestive heart failure is managed with heart transplantation.

In summary, we present a coexistence of NVM and TOF in a 22-year-old male with the typical clinical and echocardiographic features of the disease.

References

(1.) Ichida F, Hamamichi Y, Miyawaki T, et al. Clinical features of isolated noncompaction of the ventricular myocardium. Long-term clinical course, hemodynamic properties, and genetic background. J Am Coll Cardiol 1999; 34: 233-40.

(2.) Murphy RT, Thaman R, Blanes JG, et al. Natural history and familial characteristics of isolated left ventricular non-compaction. Eur Heart J 2005;26:187-92.

(3.) Ritter M, Oechslin E, Sutsch G, Attenhofer C, Schneider J, Jenni R. Isolated noncompaction of the myocardium in adults. Mayo Clin Proc 1997; 72: 26-31.

(4.) Weiford BC, Subbarao VD, Mulhern KM. Noncompaction of the ventricular myocardium. Circulation 2004;109:2965-71.

(5.) Celik S, Gorgulu S, Gurol T, Dagdeviren B, Eren M, Tezel T. Myocardial noncompaction: two cases and review. Anadolu Kardiyol Derg 2003;3:48-53.

(6.) Tunaoglu FS, Kula S, Olgunturk R, Ozturk G. Noncompaction with arcus aorta anomalies. Turk J Pediatr 2003;45:363-6.

(7.) Cavusoglu Y, Ata N, Timuralp B, Gorenek B, Goktekin O, Kudaiberdieva G, et al. Noncompaction of the ventricular myocardium: report of two cases with bicuspid aortic valve demonstrating poor prognosis and with prominent right ventricular involvement. Echocardiography 2003; 20: 379-83.

(8.) Bax JJ, Lamb HJ, Poldermans D, Schalij MJ, de Roos A, van der Wall EE. Noncompaction cardiomyopathy-Echocardiographic diagnosis. Eur J Echocardiogr 2002; 3: 301-2.

(9) Jenni R, Oechslin E, Schneider J, Attenhofer Jost C, Kaufmann PA. Echocardiographic and pathoanatomical characteristics of isolated left ventricular non-compaction: a step towards classification as a distinct cardiomyopathy. Heart 2001;86:666-71.

(10.) Oechslin EN, Attenhofer Jost CH, Rojas JR, Kaufmann PA, Jenni R. Long term follow-up of 34 adults with isolated left ventricular non-compaction: a distinct cardiomyopathy with poor prognosis. J Am Coll Cardiol 2000; 36: 493-500.

Istemihan Tengiz, Emil Aliyev, Ugur O. Turk, Ertugrul Ercan Central Hospital, Kardiyoloji Klinigi, Izmir, Turkey
COPYRIGHT 2006 Galenos Yayincilik
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2006 Gale, Cengage Learning. All rights reserved.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:Case Report/Olgu Sunumu
Author:Tengiz, Istemihan; Aliyev, Emil; Turk, Ugur O.; Ercan, Ertugrul
Publication:The Anatolian Journal of Cardiology (Anadolu Kardiyoloji Dergisi)
Article Type:Case study
Date:Jun 1, 2006
Words:1238
Previous Article:Ebstein anomalisi ile aort koarktasyonu birlikteligi ve neonatal balon anjiyoplasti/Ebstein's anomaly with and neonatal balloon angioplasty.
Next Article:Renal transplantasyonlu bir hastada "off-pump" koroner arter baypas cerrahisi/Off-pump coronary artery bypass operation in a renal transplant patient.
Topics:


Related Articles
Minikardiyopleji yontermi ile kardiyopleji uygulamasi: Cardioplegia by minicardioplegia technique.
Ebstein anomalisi ile aort koarktasyonu birlikteligi ve neonatal balon anjiyoplasti/Ebstein's anomaly with and neonatal balloon angioplasty.
Noncompaction of the ventricular myocardium with bicuspid aortic valve/Bikuspid aort kapagi ile gorulen ventrikuler miyokardda "noncompaction".
Cardiac ruptures following myocardial infarction in medicolegal cases / Infarkt sonrasi gelisen kardiyak rupturler; adli otopsi serisi.
Tetralogy of Fallot with anomalous origin of the left pulmonary artery from descending aorta/Fallot tetraloji'li bir olguda sol pulmoner arterin inen...
Implantation of pulmonary valve without use of cardiopulmonary bypass: an innovative method/Kardiyopulmoner baypas gerektirmeyen pulmoner kapak...

Terms of use | Privacy policy | Copyright © 2019 Farlex, Inc. | Feedback | For webmasters