RESUMO
BACKGROUND: Effects of nonright-handedness on risk for sudden death associated with coronary artery disease via sympathetic imbalance contributed to ventricular arrhythmogenesis previously have been demonstrated. This study hypothesized that left-handedness might be associated with cardiac autonomic functions in healthy young men. The aim of this study was to examine the association between left-handedness and cardiac autonomic functions in healthy young men. METHODS: A total of 992 asymptomatic young male subjects underwent routine health checkup between May 2012 and July 2013, and were included in this study. All were submitted to a standard protocol that included a complete clinical examination, laboratory evaluation, 12-lead electrocardiogram, and 2D-echocardiogram. Fifty-two subjects were left-handed; 32 subjects had abnormal QRS-T angle. Statistical analyses were performed using statistical package SPSS 15.0 (IBM Corp., Armonk, NY, USA) and statistical significance was assessed at the two-tailed 0.05 threshold. RESULTS: A total of 52 (5%) subjects were left-handed; 32 (3%) subjects had an abnormal frontal QRS-T angle. The mean age, body mass index, systolic blood pressure, diastolic blood pressure, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, triglycerides, fasting glucose, current smoking, estimated glomerular filtration rate, hemoglobin, leukocyte count, platelet count, and echocardiographic parameters were not different between two groups. But subjects with left-handedness had greater prevalence of abnormal QRS-T angle. The left-handedness group had 18 subjects with abnormal QRS-T angle (34%) and the right-handedness group had 14 subjects with abnormal QRS-T angle (1.4%). The difference between two groups was significant (P < 0.001). CONCLUSION: In this study, there was a significant association between left-handedness and abnormal QRS-T angle in healthy young subjects.