Supernormal conduction in a case of mobitz type II atrioventricular block
| Autor: | Yasunaga Hiyoshi, Naokata Sumitomo, Masaya Sugiura, Hidetaka Okazaki, Mamoru Ayusawa, Takeshi Motomiya, Harumizu Sakurada, Masayasu Hiraoka |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Atropine
Pacemaker Artificial medicine.medical_specialty Heart block Supernormal conduction Bundle-Branch Block Electrocardiography Internal medicine medicine Humans Mobitz type II atrioventricular block medicine.diagnostic_test Bundle branch block business.industry Isoproterenol Middle Aged Right bundle branch block medicine.disease Atrioventricular node Heart Block medicine.anatomical_structure Anesthesia Atrioventricular Node Exercise Test Cardiology Female Cardiology and Cardiovascular Medicine business medicine.drug |
| Zdroj: | Journal of Electrocardiology. 31:61-65 |
| ISSN: | 0022-0736 |
| Popis: | A 52-year-old woman exhibited Mobitz type II atrioventricular block with right bundle branch block and 1:1 atrioventricular conduction at or slower than 80 beats/min. Electrophysiologic study revealed transient HV interval block followed by recovery from the block at shorter coupling intervals without prolongation of the H1H2 and H2V2 intervals, suggesting true supernormal conduction. Isoproterenol enhanced the supernormal conduction, with shortening of blocked intervals and recovery of atrioventricular conduction, while atropine caused their less marked enhancement. Linking (ie, retrograde concealment of the impulse to the distal His bundle region through the blocked right bundle branch) is considered a possible mechanism of supernormal conduction in this case. |
| Databáze: | OpenAIRE |
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