Key result
Postmortem histology and electrophysiology reveal an atrio-hisian bypass tract explaining absent PR interval lengthening.
Case Report (n=1)
This case report correlates the electrophysiologic finding of a fixed PR interval during premature atrial stimulation with the anatomic presence of an atrio-hisian bypass tract.
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Single-case histologic confirmation of atrio-hisian bypass in fatal SVT; leaves open its prevalence and management implications in short-PR patients.
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.
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C Brechenmacher (2012) conducted a case report in Repeated seizures and a short PR interval with narrow QRS complex (n=1). Electrophysiologic studies and postmortem histological examination was evaluated on Electrophysiology and histology findings. Electrophysiologic studies and postmortem histological examination in a patient with a short PR interval revealed an atrio-hisian bypass tract, explaining the lack of PR interval lengthening.
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