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This study presents a rare case of sinoventricular conduction during unstable angina. Sinus impulses conducted without visible P waves suggest atrial refractoriness due to ischemia.
Area of Science:
- Cardiology
- Electrophysiology
- Myocardial Infarction
Background:
- Unstable angina pectoris is a critical condition.
- Sinoventricular conduction is a rare phenomenon.
- Myocardial ischemia can affect atrial electrical activity.
Abstract:
A case with sinoventricular conduction and sinus bradycardia during unstable angina pectoris is presented. Although His bundle electrogram showed atrial and His bundle deflection no P waves could be observed in any surface leads even when effective high right atrial pacing was performed. It may be assumed that the electric or sinus impulses are conducted over the specialized atrial tracts while atrial muscle is in a refractory state due to myocardial ischemia.