Atrio‐Hisian Fibers Anatomy and Electrophysiology

Introduction In this case, electrophysiology and histology could be studied in the same heart. Clinical investigation, clinical electrophysiology, and postmortem serial histological sections of the septum were analyzed. Methods A patient with repeated seizures and a short PR interval with narrow QRS complex underwent electrophysiologic studies. Results The patient died while experiencing a very rapid supraventricular tachycardia and histologic examination showed a atrio‐hisian bypass tract. Conclusion In our study, the lack of lengthening of the PR interval in spite of progressively premature atrial stimulation connected with the presence of atrio‐hisian bypass tract.