Rhythm disorders
Tachy-brady syndrome
ECG criteria
Sick sinus syndrome with alternating tachy- and bradyarrhythmias.
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.
- 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).
- AVNRTAV nodal reentrant tachycardia: regular narrow QRS, rate 150-220, often retrograde P buried in QRS.