normalmeasurementprolongedecgfirst degreerhythmsinus bradycardiaformulapaced rhythmheartdiagramlabeledsinus rhythmventricular tachycardiacomplete heart blockcalculationcardiac cyclesupraventricular tachycardiaultrasoundp wavesecond degreesinus tachycardiaabnormaljunctional rhythmgraphextendedqrs complexatrial tachycardiawandering atrial pacemakerfetal ultrasound
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