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Normal Sinus RhythmOriginates in the SA node, follows appropriate conduction pathways.Rhythm: RegularRate: 60-100 bpmEvery P has a QRS and every QRS has a PPRI: 0.12-0.20 secondsQRS: 0.08 -0.12 seconds, narrow
Sinus TachycardiaOriginates in the SA node. Rapid rhythm which occurs with increased oxygen demand ( exercise, infection, hypovolemia, hypoxia, MI, and to stimulant drugs).Rhythm: regular/fastRate: > 100 bpmEvery P has a QRS and every QRS has a P PRI: .12 - .20 seconds QRS: normal
Atrial FlutterCharacterized by “saw tooth” atrial activityConduction ratio to the ventricles 2:1 – 8:1. ( usually 2:1-4:1)Caused by a reentrant circuit located in the right atrium.May occur in COPD, hypoxia, intrinsic cardiac disease, valve disease, pericarditis or post operatively.If >150 bpm, may seriously compromise cardiac output.Treatment is rate control, cardioversion, surgical or catheter ablation. Rate: atrial rate 250-400 (generally 300bpm)