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Left ventricular noncompaction is a rare cardiomyopathy, that should be considered as a possible diagnosis because of its potential complications which are heart failure, ventricular arrhythmias, and embolic events. Echocardiography is the standard diagnostic tool, and cardiomagnetic resonance can confirm or rule out this disease when the apex is difficult to visualise.
Left ventricular noncompaction or "spongy myocardium", is a rare congenital cardiomyopathy that can be diagnosed at any age. It is characterised by a thin, compacted epicardial layer and an extensive non-compacted endocardial layer, with prominent trabeculation and deep recesses that communicate with the left ventricular cavity but not with the coronary circulation (1), probably due to an arrest of compaction during intrauterine life. It can be isolated or associated with other congenital diseases. Based on echocardiographic studies, reported prevalence is between 0.014 and 1.3% in the general population. Eventually, this condition can potentially lead to chronic heart failure, life threatening ventricular arrhythmias and systemic embolic events (2).
Although there is no consensus on diagnostic criteria, echocardiography is the main diagnostic tool. In 2001, Jenni et al (3) proposed criteria based on an end systolic ratio of non-compacted to compacted layers above 2. Segments involved are mid ventricular (especially inferior and lateral ones) and apical (Fig. 1) with evidence of direct blood flow from the ventricular cavity into deep intertrabecular recesses by colour Doppler (Fig 2). Figure 1: A case of left ventricular noncompaction. Involves mid venticular and apical segments. Figure 2: Color Doppler showing direct blood flow from the ventricular cavity into deep intertrabecular recesses in a case of left ventricular non-compaction. Here are some practical tips when using echo:
Cardiac magnetic resonance imaging has become the method of choice to confirm or rule out left ventricular noncompaction, because echocardiography cannot allow proper visualisation of the apex in some cases (figure 4). Figure 4 : Cardiac magnetic resonance imaging of a case of left ventricular noncompaction. Number of segments visualised : Thuny et al. (5) demonstrated that CMR is superior to 2D echocardiography in regards to the number of segments that can be analysed (especially during assessment of anterior, anterolateral and inferolateral segments) and the evaluation of the extent of the two-layered structure. Criteria for diagnosis by CMR: Petersen et al. (6) described the criteria for the diagnosis by CMR: the ratio of noncompacted myocardium to compacted myocardium must be greater than 2.3 during the diastole (sensitivity of 86% and specificity of 99%). Later, Jacquier et al. (7) described another method to diagnose this entity: a trabeculated left ventricular mass above 20% of total mass with a sensitivity of 91.6% and a specificity of 86.5% is predictive of LVNC. Correlation with clinical severity: In terms of correlation with clinical severity, Dodd et al. (8) showed that the amount of delayed trabecular hyperenhancement correlates significantly with LV ejection fraction (LVEF) and is an independent predictor of LVEF.
The classical triad of complications - heart failure, ventricular arrhythmias and systemic embolic events - are common in patients with advanced disease, although overall, they are less frequently observed in recent studies than they were in initial reports. Oechslin et al (9) reported that in a group of 34 adults with left ventricular noncompaction, the presence of higher final diastolic diameter of left ventricle, low ejection fraction, functional class III-IV (New York Heart Association), persistent or permanent atrial fibrillation and bundle branch block were related with high risk and poor prognosis, calling to consider the possibility of implantation of an automated cardiac defibrillator and evaluation for transplant. Mortality was similar in left ventricular noncompaction as with patients with nonischemic dilated cardiomyopathy (3 year survival of 85 to 83 %) (10). Diagnosis calls for the study of family members, and maybe, genetic counseling. Due to the high prevalence of neuromuscular disorders reported in patients with left ventricular noncompacton, neurological and musculoskeletal evaluations are also recommended (11,12).
Left ventricular non compaction is a rare cardiomyopathy, but that should always be considered as a possible diagnosis because of its potential complications. Echocardiography is the standard tool for diagnosis, and CMR is very useful to confirm or rule out this disease, especially when the apex is difficult to visualise. Nevertheless, there are still many questions regarding this disease that require further investigation and follow up.
1.Isolated noncompaction of left ventricular myocardium. A study of eight cases Chin TK, Perloff JK, Williams RG, Jue K, Mohrmann R. Circulation 1990;82:507–513. 2.Isolated noncompaction of the myocardium in adults Ritter M, Oechslin E, Sutsch G, Attenhofer C, Schneider J, Jenni R. Mayo Clin Proc 1997;72:26 –31. 3.Echocardiographic and pathoanatomical characteristics of isolated left ventricular non-compaction: a step towards classification as a distinct cardiomyopathy Jenni R, Oechslin E, Schneider J, Attenhofer Jost C, Kaufmann PA. Heart. 2001;86(6):666-71. 4.Pitfalls in the diagnosis of left ventricular hypertrabeculation/non-compaction Stollberger C, Finsterer J. Postgrad Med J. 2006; 82 (972): 679-83. 5.Assessment of left ventricular noncompaction in adults: side-by-side comparison of cardiac magnetic resonance imaging with echocardiography Thuny F, Jacquier A, Jop B, Giorgi R, Gaubert JY, Bartoli JM, Moulin G, Habib G. Arch Cardiovasc Dis. 2010;103(3):150-9. 6.Left ventricular non-compaction: insights from cardiovascular magnetic resonance imaging Petersen SE, Selvanayagam JB, Wiesmann F, Robson MD, Francis JM, Andersen RH, et al. J Am Coll Cardiol. 2005; 46 (1): 101-5. 7.Measurement of trabeculated left ventricular mass using cardiac magnetic resonance imaging in the diagnosis of left ventricular non-compaction Jacquier A, Thuny F, Jop B, Giorgi R, Cohen F, Gaubert JY, Vidal V, Bartoli JM, Habib G, Moulin G. Eur Heart J. 2010 May;31(9):1098-104. 8.Quantification of Left Ventricular Noncompaction and Trabecular Delayed Hyperenhancement with Cardiac MRI: Correlation with Clinical Severity Dodd JD, Holmvang G, Hoffmann U, Ferencik M, Abbara S, Brady TJ, Cury RC. AJR Am J Roentgenol. 2007 Oct;189(4):974-80. 9.Long- term follow-up of 34 adults with isolated left ventricular noncompaction: a distinct cardiomyopathy with poor prognosis Oechslin EN, Attenhofer Jost CH, Rojas JR, Kaufmann PA, Jenni R. J Am Coll Cardiol. 2000; 36 (2): 493-500. 10.Isolated left ventricular noncompaction syndrome Stanton C, Bruce C, Connolly H, Brady P, Syed I, Hodge D, Asirvatham S, Friedman P. Am J Cardiol 2009;104:1135-1138. 11.Noncompaction of the Ventricular Myocardium Circulation. 2004; 109: 2965-2971 doi: 10.1161/01.CIR.0000132478.60674.D0 12.Noncompaction cardiomyopathy: a current view Rosa LV, Salemi VM, Alexandre LM, Mady C. Arq Bras Cardiol. 2011;97(1):e13-9.
Gisela Feltes-Guzmán, MD*; Iván J. Núñez-Gil, MD, PhD, FESC**. *Cardiovascular Imaging Unit. Cardiovascular Institute. Hospital Clínico San Carlos, Madrid. Spain. ** Coronary Care Unit-Interventional Cardiology. Cardiovascular Institute. Hospital Clínico San Carlos, Madrid. Spain. Authors' disclosures. None declared.