A Digital Timer for On‐Line Interval Measurement

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Abstract
A digital timer suitable for on‐line timing of cardiac intervals on a beat‐by‐beat basis is described in detail. The device expedites the process of on‐line data acquisition and analysis of mapping and timing of atrial and/or ventricular multiple data points for electrophysiologic surgery. An unusual feature allows interval measurement between a fixed reference point and varying data points to be expressed as a positive value regardless of whether the data point occurs before or after the reference. This low‐cost device is simple to operate and adds versatility to any existing analog recording system. (PACE, Vol. 4, September‐October, 1981)

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