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Electrocardiogram

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Updated 2007-02-05 19:15

Electrocardiogram

Question Answer
P waveatrial depolarization
PR segmentconduction delay thru AV node (200msec)
QRS complexventricular depolarization (<120msec)
QT intervalmechanical contraction of the ventricles
T waveventricular repolarization
ST segmentisoelectric, ventricles depolarized
U wavecaused by hypokalemia
Peaked T wavecaused by hyperkalemia
Atrial Fibrillationirregularly spaced QRS complexes
Atrial Fluttersawtooth
1st degree blockprolonged PR interval (>200)
2nd degree block Mobitz 1"Wenckebach" progressive lengthening of PR until dropped beat
2nd degree block Mobitz 2No change in PR interval, but ratio of P:QRS 2:1, 3:1, etc.
3rd degree block (complete)atria and ventricles beat independently of each other
Ventricular Fibrillationno identifiable waves. fatal without defibrillation and CPR
ST elevationtransmural infarct
ST depressionsubendocardial infarct
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