Multi-channel USB acquisition for automated QT dispersion

Abstract

QT dispersion has been shown to be a marker of those at risk of sudden cardiac death due to cardiac arrhythmias [1]. QT is among of the various parameters of electrocardiogram (ECG) that represents the heart abnormalities. QT interval is defined as the measurement between the Q onset and the T offset of the typical ECG wave. QT dispersion (QTd) is defined as the subtraction of the maximum QT interval and the minimum QT interval in any of the 12 ECG leads. Automatic QT interval measurement involves the accurate detection of the Q onset and T offset point in the ECG wave. The T offset computerized detection is the most challenging task. This is due to the different morphologies of the T wave [1]. Therefore it is critical to have in hand a database of ECG from various groups of subjects from a variety of arrhythmias. Since the QTd has the potential in anticipating sudden cardiac death, it is important to have tool that acquires the ECG and produces the QTd index continuously and as instantaneous as possible. Moreover, the development of algorithm such as the T end point detection which utilizes digital signal processing is an endless study and improves with time. Hence a PC based USB acquisition for 12 lead ECG is relevant to facilitate this never ending algorithm development and database growth.