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CASE REPORT
Year : 2009  |  Volume : 10  |  Issue : 1  |  Page : 30-37 Table of Contents     

Isolated left ventricular noncompaction: Case report and review of the literature


1 M.D, Adult Intervention Cardiology Fellow, University Health Network, Toronto, Canada
2 M.D, Consultant Cardiologist, Department of Cardiology and Cardiothoracic Surgery, Hamad Medical Corporation, Doha, Qatar

Date of Web Publication17-Jun-2010

Correspondence Address:
Awad Alqahtani
M.D, Adult Intervention Cardiology Fellow, University Health Network, Toronto
Canada
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Source of Support: None, Conflict of Interest: None


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How to cite this article:
Alqahtani A, Alnabti A. Isolated left ventricular noncompaction: Case report and review of the literature. Heart Views 2009;10:30-7

How to cite this URL:
Alqahtani A, Alnabti A. Isolated left ventricular noncompaction: Case report and review of the literature. Heart Views [serial online] 2009 [cited 2019 Dec 15];10:30-7. Available from: http://www.heartviews.org/text.asp?2009/10/1/30/63843


   Introduction Top


Isolated left ventricular noncompaction (IVNC) is a rare congenital disorder that was first described in a 33-year-old woman by Engberding et al, [1] in 1984. Subsequently, many case reports and several case series in both children and adults have been published [2],[3],[4],[5],[6],[7],[8],[9] . IVNC was recently classified as a genetic cardiomyopathy [10] caused by a failure of normal embryogenesis of the endocardium and myocardium in utero [11] , resulting in prominent ventricular trabeculations with deep intertrabecular recesses [Figure 1].

Noncompaction can occur in isolation or in association with various other cardiac anomalies, such as obstruction of the right or left ventricular outflow tract, complex cyanotic congenital heart disease, and coronary anomalies [12],[13] . However, IVNC, by definition, occurs in the absence of other coexisting cardiac abnormalities [14] . The clinical manifestations of this disease are quite diverse and often diagnosis is delayed due to the limited awareness of its unique clinical and imaging characteristics [5] . We present a case report of a 22-year-old male with IVNC and discuss clinical presentation, diagnostic criteria, management, and prognosis.


   Case presentation Top


This is 22-year-old male referred to cardiology with a diagnosis of cardiomegaly seen on chest X-ray. His history started with symptoms of mild hemoptysis while being certified in scuba diving. The maximum depth he dove was 25 feet and other than noticing blood in his saliva, he had a good experience. Later that night, however, he experienced chest pain and when it wasn't gone by the next morning his mother took him to a local Emergency. By his description, the local hospital felt that his chest pain was muscular in nature but performed a CXR, which revealed marked cardiomegaly. An echocardiogram was ordered as outpatient and booked to be seen at cardiology.

Past medical history revealed that he was in excellent health: he is physically active; plays various sports, runs 3-4 km four times per week and has been working this summer at a water park where his job is to help patrons at the top of a large water slide which is 98 steps up.

When questioned further, he admitted to having noticed some very mild decrease in exercise tolerance over the past 6 months where he found he was more tired while playing hockey.

Family history revealed that his father was diagnosed with severely reduced cardiac function 10 years ago. He has one sister, age 19 who is healthy. No other significant family history.

He had no known drug allergies. He was not on any medications. He tried marijuana in the past but nothing illicit/illegal in recent months.

Physical examination: Vital Signs: HR 98, RR 22, BP 90/60, Afebrile, O2 saturation 99% in room air, mildly tachypneic but with no accessory muscle use. JVP at 2 cm. Examination of HEENT and lungs were normal. Cardiac examination showed a slightly active precordium with displaced apex downward and laterally; normal S1, loud S2 with audible S3. There was a grade 2/6 holosystolic murmur heard best at the apex. Abdomen was soft, non-distended, and non-tender. The tip of the liver was palpable at the right costal margin. There was no splenomegaly. Extremities were pale and cool to touch but no cyanosis. Radial, femoral, and pedal pulses were 2+.

Blood chemistry including CBC, electrolytes, creatinine, liver function tests, and blood gas analysis were normal.

ECG showed sinus tachycardia (rate 109); QRS duration 100, QTc 468, axis 108, possible LV hypertrophy.

An echocardiogram showed situs solitus, levocardia, left aortic arch and atrioventricular-ventriculoarterial (AV-VA) concordance; pulmonic veins drained normally to left atrium and inferior vena cava to right atrium. The interatrial and interventricular septum were intact. The left ventricle was markedly dilated with severely decreased global left ventricular systolic function (EF 16%). Hypertrabeculation with multiple crypts at the apical postero-lateral aspects of the left ventricle [Figure 1] was noted. There was mild to moderate mitral regurgitation (MR) with dilated LA. There was moderate right ventricular dysfunction and right strial dilatation. The RVSP was 51 mmHg. The main pulmonary artery and branches were normal-sized. Normal sized PA and branches. There was mild aortic insufficiency with tricuspid aortic valve, normal coronary artery origins. There was no pericardial effusion.

A diagnosis of isolated left ventricular non compaction (LVNC) was given based on the echo finding. A CT chest was performed for work-up of hemoptysis and confirmed bilateral subsegmental pulmonary emboli. Patient was started on warfarin, low dose angiotensin-converting enzyme inhibition and beta blocker therapy. 24 hour Holter monitoring showed no arrhythmia detected. Cardiac MRI was done and supported the diagnosis of left ventricular non compaction [Figure 3]. He was referred to electrophysiology service for consideration of internal defibrillator implantation. We advised him to bring his sister for echocardiography test to rule out the existence of this condition.


   Epidemiology Top


IVNC has been described both in children and in adults. Based on all current case reports, the incidence is higher in men than in women. A recent epidemiological study of primary cardiomyopathies in Australian children indicated that IVNC accounted for 9.2% of all cases and that it was the third most common cause of cardiomyopathy after dilated and hypertrophic cardiomyopathies15. This is similar to the experience at the Texas Children's Hospital in the United States (US), where IVNC accounted for 9.5% of cardiomyopathies identified in children over a 5-year period [9] . In the adult population, among patients referred to a tertiary-care centre for echocardiography, two series of case reports indicated a prevalence of 1.4 to 26 per 10,000 [4],[16] ; nevertheless, since all current prevalence data are based on case reports, the true prevalence of IVNC in adults remains unclear.


   Genetics Top


IVNC is a genetically heterogeneous disorder with both familial and sporadic forms. To date, mutations in 7 different genes have been found [17] ; however, at present, mutations in G4.5 gene (TAZ gene) on the Xq28 chromosomal region identified in neonatal IVNC is the only confirmed disease-causing locus [18] . This gene codes for a protein known as taffazin, which has a role in the maintenance of the cardiolipin layer in the inner membrane of the mitochondria, as well as in the promotion of differentiation and maturation of osteoblasts, and in prevention of maturation in adipocytes [19] . Mutations in the TAZ gene have not been identified in adults; further, contrary to the potential X-linked transmission in neonatal IVNC, it has been proposed that the mechanism of transmission in adults is autosomal dominant [20] . This is based on the observations that approximately 50% of descendants of patients with IVNC inherit the condition, cases of maleto-male transmission occurs, and the disorder may occur in females.


   Clinical presentation Top


The clinical presentation of IVNC is highly variable, ranging from an incidental echocardiographic diagnosis without symptoms to disabling heart failure. Often, the reasons for referral to a cardiologist in patients eventually diagnosed with IVNC include unexplained heart failure, uncertain echocardiographic findings, palpitations, or shortness of breath on exertion [4] . The three most common clinical presentations include heart failure (HF), arrhythmias, and embolic events [11],[24] . Additional presenting symptoms include chest pain and syncope [24].

Heart failure

In HF, clinical presentations range from asymptomatic LV dysfunction to severe disabling HF. In a comparison of all published adult case series, the prevalence of symptomatic HF is 30-73%, while LV systolic dysfunction is 58-82% [2],[3],[4],[5],[6],[7],[8],[9] . This is similar to the prevalence in case reports of children with IVNC. Although most patients have systolic LV dysfunction, diastolic dysfunction has also been described in as many as one-third of the patients in several case series [3],[24],[25] . The cause of systolic dysfunction in patients with IVNC is unclear; however, there are two leading hypotheses:

  • Chronic subendocardial hypoperfusion and microcirculatory dysfunction [26].
  • Reduced thickness of the compact myocardial layer in relation to the trabeculated myocardium in the affected regions [21].
Diastolic dysfunction, on the other hand, may be related to both abnormal relaxation and restrictive filling caused by the numerous prominent trabeculae [25].

Arrhythmias

The two most common clinically significant arrhythmias in patients with IVNC are atrial fibrillation and ventricular tachycardia. Atrial fibrillation is seen in as many as 5-29% of patients, while ventricular tachycardia has been described in 3-47% of patients- Sudden death occurred in 18% of patients followed in two case series [4],[5] . Paroxysmal supraventricular tachycardia and complete heart block have also been reported in patients with IVNC [3],[5] .

Several hypotheses have been proposed for the high incidence of ventricular arrhythmias and sudden cardiac death in patients with IVNC. These include irregular branching and connection of myocardial fascicles to the noncompacted segments, isometric contraction with increased wall stress, and localized coronary perfusion impairment inducing disorganized or delayed electrical activation [27] . In addition post-mortem analyses have illustrated the presence of ischemic subendocardial lesions with fibrosis, likely secondary to chronic ischemia. These lesions can also act as substrates for ventricular arrhythmias [28] . Furthermore, many patients with IVNC have significant LV dysfunction, which in turn is a risk factor for ventricular arrhythmias [24] .

Several nonspecific electrocardiogram (ECG) abnormalities are present in most patients with IVNC [8],[24] . These include LV hypertrophy, left bundle branch block, intraventricular conduction delays, inverted T waves, and axis shifts. In approximately 15% of pediatric patients, Wolff-Parkinson-White syndrome has been described; however, its prevalence in the adult population is negligible.

Thromboembolism

Thromboembolism may include the cerebrovascular, pulmonary, peripheral vascular or mesenteric systems. Initial case reports illustrated a prevalence as high as 24% in adult populations [5] ; however, more recent publications indicate a prevalence of 0-9% over a follow-up period of 2.4-3.8 years [7],[8],[24] . This lower prevalence is partially due to selective anticoagulation with acetylsalicylic acid or warfarin in two of the three recent case reports and the larger populations reflect a more accurate estimate [7],[24] . The prevalence of thromboembolism in the two pediatric case series is much lower and no cases of systemic thromboembolism are reported in the largest case series.

Thromboembolic events have been attributed to the formation of thrombi in the extensively trabeculated ventricular myocardium, to LV dysfunction, and/or atrial fibrillation. Nevertheless, recent pathological data suggest that the formation of thrombi in noncompacted ventricles is not very common [29] . Furthermore, one of the largest case-control retrospective studies in patients with IVNC revealed that when patients were matched with controls having similar degrees of LV dysfunction, there was no difference in the rates of systemic thromboembolism [30] . As a result, it appears that the main risk factors for cardioembolic events in patients with IVNC are the severity of the underlying systolic dysfunction, the presence of atrial tachyarrhythmias, and the presence of previous thromboembolic events rather than noncompaction itself.


   Diagnosis Top


Echocardiography

Traditionally, the diagnosis of IVNC is based on 2D echocardiography and characterized by the presence of numerous, prominent trabeculations with deep intertrabecular recesses in hypertrophied and often hypokinetic segments in the myocardium of the LV [Figure 1] [11] . The most commonly involved areas are the LV apex, and the mid inferior and lateral walls [28] . Ventricular wall hypokinesis may also be observed in the compacted segments of the myocardium, which supports the hypothesis of diffuse myocardial microcirculatory dysfunction in these patients [4] . The most commonly used echocardiographic criteria for the diagnosis of IVNC in adults follows the proposal by Oechslin et al [Table 1] [14]. The validity of these criteria in differentiating IVNC from other common cardiomyopathies was established in a subsequent publication [31] . Right-ventricular noncompaction has also been described; however, due to the difficulty in distinguishing normal variants found in the highly trabeculated right ventricle from the pathological noncompacted ventricle, many authors dispute the existence of this entity [4] . Currently, standard criteria for the diagnosis of rightventricular noncompaction do not exist.

Magnetic resonance imaging

MRI has an emerging role in the diagnosis and prognosis of patients with IVNC [32] . Currently, the role of MRI includes confirming echocardiographic findings, detecting subtle forms of IVNC, localizing and determining the extent of myocardial involvement, obtaining myocardial perfusion data, assessing extent of myocardial fibrosis, identifying ventricular thrombi, and helping to differentiate IVNC from other potential diagnoses [33] .

MRI findings for IVNC reveal [Figure 3]:

  • Numerous, excessive trabeculations in the LV with predominant involvement of apical and mid portions of the lateral and inferior walls [32].
  • Thinning of the LV wall in diastole.


Furthermore, several MRI features are thought to have poor prognostic value; these include high intensity T2 signal in the endocardial layer [34] presence of subendocardial perfusion defects35 and delayed enhancement of the subendocardial layer [36].

Compaction during embryological life. [Figure 2]A: Reproduced from Sedmera D et al. [22] Reprinted with permission. [Figure 2]B and C: Reproduced from Wessels A et al. [23] Copyright© 2003 the American Physiological Society. Reprinted with permission

Other diagnostic modalities

Several other diagnostic modalities have been described; however, none have proven superior to echocardiography or MRI. To date, computed tomography (CT) has not been widely used in the description of patients with IVNC and no diagnostic criteria exist. PET has been used to illustrate the presence of microcirculatory dysfunction in the hearts of patients with IVNC26 but it lacks utility in the diagnosis of IVNC. The "loosened myocardium" of IVNC has also been observed by ventriculography during angiography [37] . However, contrast ventriculography and coronary angiography are useful to rule out other concomitant cardiac abnormalities, rather than to diagnose IVNC.


   Natural history Top


Prognosis for patients with IVNC is highly variable; the spectrum ranges from a prolonged asymptomatic course to rapid progressive HF, which may lead to heart transplantation or death. Based on a pediatric case series, LV dysfunction inevitably develops in patients with IVNC over a 10-year period, regardless of the presence of symptoms at the time of diagnosis [3] . Similarly, in an adult case series with serial echocardiograms, 43% of patients had a progressive decline in LV ejection fraction over a 3-year period [24] . HF hospitalization is common in adults, occurring in as many as 50% of patients in one study [4],[7],[24] . Earlier studies by Ritter et al [5] and Oechslin et al [4] reported mortality in the range of 35%-47% for mean follow up periods of 2.5 and 3.7 years, respectively. More recent publications with similar mean follow-up periods report mortality in the range of 2%-15%, suggesting that the prognosis may not be as poor as previously described. This is likely because many patients identified in recent studies had milder phenotypes of the disease, lower incidences of symptoms at diagnosis, higher prevalences of implantable cardioverter defibrillator (ICD) use, better use of evidence based medical therapy, and improved echocardiographic techniques to facilitate the detection of previously unrecognized asymptomatic cases.

Certain features seem to be associated with patients at a higher risk of mortality, including higher LV end diastolic diameter at the time of initial presentation, New York Heart Association class III/IV, chronic atrial fibrillation, bundle branch block, four sustained ventricular arrhythmias, and higher left-atrial size [7] . Patients with these characteristics may need closer follow-up and more aggressive clinical management.


   Management Top


Currently, there are no guidelines for the management of patients with IVNC. Management plans generally involve a confirmation of the diagnosis with echocardiogram and other imaging modalities, as needed. Prominent trabeculations (normal variant), apical hypertrophic cardiomyopathy, hypertensive heart disease, dilated cardiomyopathy, endocardial fibroelastosis, cardiac metastases, and LV thrombus are important differential diagnoses [3],[6],[24] .

Patients with noncompaction with or without LV systolic dysfunction should be followed by a cardiologist on a regular basis, with the frequency based on symptoms. Clinical visits should comprise a history, physical examination, and echocardiography, as well as Holter monitoring to identify silent arrhythmias [5],[7],[27] .

Symptomatic patients should be managed based on their clinical presentation, following the respective consensus guidelines [7],[23] . There has been significant controversy regarding anticoagulation for patients with IVNC. Some argue that all patients should be anticoagulated with warfarin [4],[5] , while others recommend anticoagulation for those with LV dysfunction, atrial fibrillation, a previous history of embolic events, or those with known ventricular thrombi [29] . The issue of ICD implantation in these patients because of the high risk of sudden cardiac death is also highly controversia[l4] . Some authors propose that patients with high-risk predictors of death (see above) should be considered for ICD implantation[27]. Finally, first degree family members of all patients diagnosed with IVNC should undergo a screening echocardiogram[4].


   Conclusion Top


IVNC is a rare genetic congenital disorder caused by failure of the normal embryogenic myocardial compaction process. Its clinical presentation is highly variable, ranging from incidental echocardiographic diagnosis to symptomatic heart failure, thromboembolism, or arrhythmia. The main diagnostic modalities are 2D echocardiogram and MRI, both of which have clearly defined diagnostic criteria. Patients with IVNC are at risk for many adverse clinical outcomes and need to be followed closely by clinicians with adequate familiarity with the disease. Management is based on guidelines that have been set out for the various clinical presentations, and screening of first degree relatives is warranted.

 
   References Top

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2.Chin TK, Perloff JK, Williams RG, Jue K, Mohrmann R. Isolated noncompaction of left ventricular myocardium. A study of eight cases. Circulation. 1990;82(2):507-513.   Back to cited text no. 2      
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7.Lofiego C, Biagini E, Pasquale F, et al. Wide spectrum of presentation and variable outcomes of isolated left ventricular non-compaction. Heart. 2007;93(1):65-71.   Back to cited text no. 7      
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12.Dusek J, Ostadal B, Duskova M. Postnatal persistence of spongy myocardium with embryonic blood supply. Arch Pathol. 1975;99(6):312-317.   Back to cited text no. 12      
13.Lauer RM, Fink HP, Petry EL, Dunn MI, Diehl AM. Angiographic demonstration of intramyocardial sinusoids in pulmonary-valve atresia with intact ventricular septum and hypoplastic right ventricle. N Engl J Med. 1964;271:68-72.   Back to cited text no. 13      
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19.Bione S, D'Adamo P, Maestrini E, Gedeon AK, Bolhuis PA, Toniolo D. A novel X-linked gene, G4.5. is responsible for Barth syndrome. Nat Genet. 1996;12(4):385-389.   Back to cited text no. 19      
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21.Bartram U, Bauer J, Schranz D. Primary noncompaction of the ventricular myocardium from the morphogenetic standpoint. Pediatr Cardiol. 2007;28(5):325-332.   Back to cited text no. 21      
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29.Stollberger C, Finsterer J. Left ventricular hypertrabeculation/noncompaction and stroke or embolism. Cardiology. 2005;103(2):68-72.   Back to cited text no. 29      
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31.Frischknecht BS, Attenhofer Jost CH, Oechslin EN, et al. Validation of noncompaction criteria in dilated cardiomyopathy, and valvular and hypertensive heart disease. J Am Soc Echocardiogr. 2005;18(8):865-872.   Back to cited text no. 31      
32.Hany TF, Jenni R, Debatin JF. MR appearance of isolated noncompaction of the left ventricle. J Magn Reson Imaging. 1997;7(2):437-438.   Back to cited text no. 32      
33.Petersen SE, Selvanayagam JB, Wiesmann F, et al. Left ventricular noncompaction: Insights from cardiovascular magnetic resonance imaging. J Am Coll Cardiol. 2005;46(1):101-105.   Back to cited text no. 33      
34.Daimon Y, Watanabe S, Takeda S, Hijikata Y, Komuro I. Two-layered appearance of noncompaction of the ventricular myocardium on magnetic resonance imaging. Circ J. 2002;66(6):619-621.   Back to cited text no. 34      
35.Soler R, Rodr?guez E, Monserrat L, Alvarez N. MRI of subendocardial perfusion deficits in isolated left ventricular noncompaction. J Comput Assist Tomogr. 2002;26(3):373-375.   Back to cited text no. 35      
36.Alsaileek AA, Syed I, Seward JB, Julsrud P. Myocardial fibrosis of left ventricle: Magnetic resonance imaging in noncompaction. J Magn Reson Imaging. 2008;27(3):621-624.   Back to cited text no. 36      
37.Jenni R, Rojas J, Oechslin E. Isolated noncompaction of the myocardium. N Engl J Med. 1999;340(12):966-967.  Back to cited text no. 37      


    Figures

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    Tables

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  In this article
    Introduction
    Case presentation
    Epidemiology
    Genetics
    Clinical present...
    Diagnosis
    Natural history
    Management
    Conclusion
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