Autonomic dysfunction in alcoholic cirrhosis and its relation to sudden cardiac death risk predictors.
Patients with liver cirrhosis have autonomic dysfunction and complex cardiovascular changes. Increases risk for sudden cardiac death (SCD) was recently recognized in liver cirrhosis. This study analyzed risk predictors for SCD related to autonomic dysfunction in patients with alcoholic liver cirrhosis (ALC). Twenty five patients with ALC were examined and compared with healthy control group. Cardiovascular autonomic reflex tests, comprehensive ECG with QTc interval, late potentials, short-term heart rate variability (HRV) analysis (time domain, spectral and nonlinear-Poincare plot analysis) and 24-h Holter ECG with long-term HRV analysis were done. According to autonomic reflex tests patients with ALC had high incidence (56%) of severe autonomic dysfunction, manifested as pronounced damage of vagal function. Patients had significantly depressed HRV (SDNN, SDANN, triangular index, LF and HF) and more frequently had serious arrhythmias, prolonged QTc and Poincare plot in a shape of dot (p < 0.001). In patient group QTc significantly inversely correlated with spectral components from short-term HRV analysis (ln(LF): r = -0.53, ln(HF): r = -0.47; p < 0.05), and Lown class significantly correlated with total autonomic function score (r = 0.64, p = 0.04). This study indicates that in ALC autonomic neuropathy with vagal impairment and sympathetic predominance is related to SCD risk predictors and onset of serious ventricular arrhythmias.