Acute peric C-Constr Peric Electrocardiology P wave Normal 50%: notch Abnormal g wave No Widespread calcification ORS Voltage ST-T Convex↑ except on-specific in avR(V1) 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