title: A digital timer for on-line interval measurement.
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.
mesh_terms: D004562:Electrocardiography / Q000295:instrumentation*; D006321:Heart / Q000502:physiology*; D006801:Humans; D009203:Myocardial Infarction; D013997:Time Factors