Effects of low-dose amiodarone and Betaloc on the treatment of hypertrophic cardiomyopathy complicated with malignant ventricular arrhythmias

Objective: To study the therapeutic effects of low-dose amiodarone and Betaloc on hypertrophic cardiomyopathy complicated by malignant ventricular arrhythmias. Methods: Eighty-two such patients were selected and divided into a treatment group and a control group by the random number method (n=41), which were administered with low-dose amiodarone plus Betaloc and individual Betaloc respectively. Results: The treatment group had a significantly higher overall effective rate (85.4%) than the control group (65.9%) did. Based on the New York Heart Association's classification of cardiovascular disease, the treatment group mainly comprised Class III and IV patients before treatment, which were significantly relieved after treatment (P < 0.05). The heart rate was evidently decreased from (119.99 +/- 18.91) bpm to (80.98 +/- 12.34) bpm, and the incidences of premature ventricular contraction and tachycardia were significantly reduced (P < 0.05). The longest QT intervals after and before treatment were (421 +/- 32) ms and (411 +/- 35) ms respectively. The shortest QT interval after treatment [(350 +/- 36) ms] was significantly longer than that before [(307 +/- 31) ms]. The QT dispersion before treatment [(96 +/- 29) ms] was significantly higher that after [(64 +/- 17) ms] (P < 0.05). Six out of eighty two patients in the treatment group succumbed to adverse reactions (14.63%). Conclusion: Hypertrophic cardiomyopathy complicated with malignant ventricular arrhythmias can be well treated with low-dose anniodarone and Betaloc, with mitigated symptoms, improved prognosis and few adverse reactions.