The rhythm is supraventricular tachycardia with block. The atrial rate is about 200/min and there is 2:1 block. There is also ST depression in leads V3 to V6 suggestive of ischemia. The patient was having a non-q myocardial infarction. Rate (/min) 100 QT (ms) 305
pr (ms) ? QRS axis (degrees) 39
QRS (ms) 75

Rate (/min) QT (ms) 357
pr (ms) QRS axis (degrees) -9
QRS (ms) 88
Rate (/min) 100 QT (ms) 336
pr (ms) 230 QRS axis (degrees) -24
QRS (ms) 95