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All Categories 2nd degree type i av block aberrancy accessory pathway action potential adenosine anatomy approach to ecg apvp ashman phenomenon asvp atrial bigeminy atrial fibrillation atrial flutter av block av dissociation avnrt bigeminy blocked pac calcium channel blockers cardiac tamponade complete av block delta wave dual av pacing electrical alternans escape beat escape rhythm functional rbbb group beating heart blocks hyperkalemia isorhythmic av dissociation junctional rhythms lbbb left atrial enlargement left bundle branch block mobitz i myocardial infarction pac pacemaker pericardial effusion pharmacology premature atrial contraction premature ventricular contraction pvc rate related wenckebach retrograde p waves septal r wave sinus arrest sinus arrhythmia sinus pause stemi svt ventricular tachycardia (vt) vt wenckebach wpw syndrome