@article{article_1742148, title={Geçici Fonksiyonel Dal Blokları: Klinik ve Elektrokardiyografik Bir İnceleme}, journal={Ankara Üniversitesi Tıp Fakültesi Mecmuası}, volume={26}, pages={1241–1250}, year={1974}, author={Sonel, Ahmet}, keywords={geçici, dal bloğu, ekg}, abstract={This study analyzes transient bundle branch blocks detected among 1535 electrocardiograms recorded over one year at Ankara University Medical Faculty’s Internal Medicine Clinic. Of the 235 cases presenting with bundle branch block, only 3 showed transient blocks related to heart rate variation. The study categorizes QRS widening into three types: (a) rate-dependent blocks due to tachycardia, (b) blocks due to bradycardia, and (c) rate-independent intermittent blocks. One case involved left bundle branch block occurring after D/C cardioversion—a phenomenon not previously reported in the literature. The findings highlight how cardiac cycle duration affects the refractory periods of the His-Purkinje system, contributing to block formation. The paper also discusses vagotonic maneuvers, bradycardia-related blocks, and intermittent conduction delays with detailed ECG illustrations and theoretical mechanisms.}, number={5-6}, publisher={Ankara University}