Sick Sinus Syndrome ECG | Medical Algorithm

Are you examining an ECG for evidence of the tachycardia-bradycardia syndrome?

Yes

Does the ECG show?

• alternating bradycardia and tachycardia?

Yes

• episodes of sinus bradycardia or subatrial bradyarrhythmias?

Yes

• periodic sinus arrest with asystole may occur, with complete absence of P waves for > 2 seconds?

Yes

• absence of escape rhythms during episodes of bradycardia?

Yes

• AV block?

Yes

• episodes of atrial fibrillation, atrial tachycardia, or atrial flutter?

Yes

Tachycardia-Bradycardia Syndrome (Sinoatrial Disorder, Sick Sinus Syndrome) Electrocardiographic Features