A Review of Left Ventricular Non-compaction Cardiomyopathy (LVNC)

Left ventricular non-compaction (LVNC) is a rare congenital phenotype defined by the presence of prominent left ventricular trabeculae, deep intertrabecular recesses (continuous with the ventricular cavity), and a thin compacted layer. The most common presentation of LVNC is dyspnea (60%), followed by palpitations (18%), chest pain (15%), syncope (9%), and prior stroke (3%). LVNC presenting with acute myocardial infarction (MI) has rarely been reported in the literature. A forty-one-years old female presented with substernal chest pain and exertional dyspnea. On physical examination, she was alert without any distress, her lungs and heart examination were within normal limits. Peripheral pulses were palpable and regular, and +1 peripheral pitting edema was noted. EKG showed normal sinus rhythm with premature atrial contractions (PACs), left axis deviation, and ST-segment and T wave changes suggestive of inferior wall ischemia. Troponin I level was found to be elevated, which peaked within 24 hours, Troponin_max 110.08 ng/ml. Transthoracic echocardiography showed moderate LV dilatation with severely reduced EF (15-20%), and diffuse LV hypokinesis with a grade III restrictive pattern. There was heavy trabeculation of LV involving 2/3rd LV endocardium and wall thickness with sinusoidal tunnels perpendicular to LV wall. These morphological findings met the diagnostic criteria of LVNC/NCM. LVNC presenting with acute myocardial infarction (MI) can be related to poor outcomes, however, more data is needed to establish the clinical implication of this presentation. Asymptomatic LVNC can be observed while symptomatic LVNC should be treated with standard guidelines of HF.