Tariq Mahmood Alam.
Heart Rate - Correction of Apex-cardiographic Parameters.
Pak Armed Forces Med J Jan ;47(2):26-9.

Apexcardiography (ACG) is a reliable and simple non-invasive technique. It is used for evaluation of left ventricular diastolic function. The most commonly employed ACG parameters are (a) A20 interval, (b) duration of rapid filling wave (RFW) and (c) relative amplitude of `a` wave (a/H ratio). Presently, these parameters are being used without correction for heart rate. This study was designed to assesss the effect of heart rate on diastolic parameters of ACG in healthy subjects (n=25). The uncorrected A20 interval (Mean ± SD) was 80±9.2 m sec and RFW was 101 ± 19.77 m sec. The a/H ratio was 2.1 ±0.73%. The heart rate was 75±9.82 bpm. The correlation and regression analysis displayed insignificant relationship of A20 interval, RFW and a/H ratio with heart rate; indicating usefulness of their raw values for left ventricular diastolic evaluation. A similar study is required at a larger scale to support the present investigation.

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