Figure 206-12 Arrhythmic causes of syncope. A. Sinus
rhythm in a patient with unexplained syncope. Sinus bradycardia. bifascicuLar
block, and a Long PR interval from surface electrocardiogram suggest
possible bradycardia etiology. In this patient, however, ventricular
tachycardia (B) was inducible with ventrucular extrastimulation anu
was the actual cause ol syncope. Control of ventricular tachycardia
(VT) without a pacemaker was sufficient to prevent syncope in this patient.
Termination of tachycardia and restoration of sinus rhythm are shown
in B. (from Sra et al. Reproduced with permission frtim the publisher and authors). |