1: Site of impulse formation–sinus rhythm, atrial rhythms, junctional rhythms.
2: Mechanism–tachy, brady, premature contractions.
3: Conduction disorder–LBBB, RBBB, complete AV block.
4: Seriousness or prognosis–minor, major, fatal.
(1) Minor–S tachy, S brady, PAC’s, PNC’s, PAC (<6 / min.)
(2) Major–A fib, 1°, 2 °,3° block, PAC, PNC, PVC (>6/min.)
(3) Fatal–V fib, asystole.
1: Supraventricular arrhythmia’s–arrhythmias whose impulse site is above the ventricles (atrial muscle or AV node).
2: Premature atrial contractions (PAC or APC) –premature and characterized by presence of P wave before QRS.
3: Paroxysmal atrial tachycardia (PAT) –runs of rapidly repeated premature atrial contractions–sudden onset; sudden stop; rate 50-150.
4: Atrial flutter–main difference between PAT and atrial tachy is rate and duration rate (atrial ) 300-320. Physiologic block at AV node doesn’t allow all atrial impulses through,
so ventricular rate may be in a ratio of 2:1 to 8:1 ( if 4:1 block, atrial rate 320, ventricular rate 80)–sawtooth baseline pattern.
5: Atrial fibrillation–irregularily irregular, undulating baseline with variable ventricular response. Lose atrial “kick” and embolization are problems. Atrial rate 350-500.
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