Noncompaction cardiomyopathy arrhythmias

Overview
Patients with NCC frequently develop both arrhythmias and heart block.

Atrial Arrhythmias
25% of patients with NCC develop atrial fibrillation. Paroxysmal supraventricular tachycardia has also been observed.

Ventricular Arrhythmias
Up to 47% of patients develop ventricular arrhythmias, and sudden cardiac death accounts for half the deaths in a series of patients with isolated left ventricular noncompaction

Heart Block
Complete heart block has been observed in patients with NCC.