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Diagnostic Holter findings for arrhythmic syncope.
| SVT or AF with a ventricular response of more than 150 bpm, lasting over 32 beats. |
| VT lasting over 32 beats. |
| Sinus pauses longer than 3 s. |
| Bradycardia of less than 40 bpm. |
| Complete AV block or second-degree AV block Mobitz type 2. |
| Alternating bundle branch block. |
Abbreviations: SVT, supraventricular tachycardia; AF, atrial fibrillation; BPM, beats per minute; VT, ventricular tachycardia; AV, atrioventricular.
