Automated QT/RR analysis based on selective beat averaging applied to electrocardiographic holter 24 H

The study of QT/RR relationship is important for rhe clinical evoluarion of possible risk of acquired or congenitol ventricular tachyarrhythmias, predisposing to life-threatening arrhythmias. Tu improve the signal-tonoise ratio and obrain auromaied and reliable QT measurements from Holter ECG 24 h, a new upproach based on selective beats averaging was applied. A total of 102 healthy subjects (range 30-75 years, 53 women. 52.8 ±11.0 years, and 49 men, 56.6±11.8 years) were studied IO obrain QT/RR normality curves (BSD around meun vulur) seporotely for duy and night-time. Gender-related und CiTCUdiUn differences in the QT/RR relation were noticed, showing the potential utility and applicutian of this unalysis to derive physiologicnl observutions on repolarization mechanisms.