Rhythm disorders
Premature atrial contractions (PACs)
ECG criteria
Early P wave with morphology different from sinus; non-compensatory pause.
Related: rhythm disorders
- Sinus rhythmNormal P before every QRS, regular rhythm, rate 60-100 bpm.
- Sinus tachycardiaSinus rhythm with rate >100 bpm.
- Sinus bradycardiaSinus rhythm with rate <60 bpm.
- Tachy-brady syndromeSick sinus syndrome with alternating tachy- and bradyarrhythmias.
- Atrial fibrillationIrregularly irregular rhythm, no discrete P waves, fibrillatory baseline.
- Atrial flutterSawtooth flutter waves, often 2:1 or 4:1 AV conduction (atrial rate ~300 bpm).