Acute Peric C-Constr Peric Electrocardiology P wave Normal 50% notch Abnormal q wave No Widespread calcification QRS VOltage ST-T Convex↑ except Non-specific in avR (VI) arrhythmia Sinus tachycardia Afib. a-v blockAcute Peric C-Constr Peric Electrocardiology P wave Normal 50%: notch Abnormal q wave No Widespread calcification QRS Voltage ↓ ↓ ST-T Convex ↑except in avR (V1) Non-specific Arrhythmia Sinus tachycardia Afib, A-V block