Key result
In dogs with complete atrioventricular block, vagal stimulation significantly decreased the ventricular escape rhythm heart rate elevated by sympathetic ganglion stimulation from 78 to 71 beats/min.
Why the study?
Does vagal nerve stimulation reduce the heart rate of ventricular escape rhythm in dogs with complete AV block during sympathetic stimulation?
Does vagal nerve stimulation reduce the heart rate of ventricular escape rhythm in dogs with complete AV block during sympathetic stimulation?
Absolute Event Rate: 71% vs 78%
p-value: p=<0.05
Vagal nerve stimulation suppresses ventricular escape rhythm primarily through direct action on acetylcholine receptors rather than solely via presynaptic inhibition of norepinephrine release.
Vagal effects on ventricular escape rhythms in AV block models warrant no clinical change; leaves open direct cholinergic mechanisms for translational research.
直流通電を用い, 房室結節～His束にcatheter ablationを施行し作成した完全房室ブロックの心室補充調律に対する自律神経の影響を検討するとともに, アセチルコリンによるノルエピネフリン遊離抑制作用が心室自動能に対し機能的に関与しているかを検討した.迷走神経刺激による心室補充調律時の心拍数の減少は星状神経節刺激時とノルエピネフリン注入時で有意差は認められないことより, 心室補充調律に対する迷走神経節刺激の抑制作用は交感神経末端からのノルエピネフリン遊離抑制作用を介するよりも受容器への直接作用が主であると考えられた.また, プロプラノロール投与後では迷走神経刺激にて心拍数が減少しないことより, 心室補充調律に対するアセチルコリンの作用はノルエピネフリンの作用に拮抗するものと推察した.
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Nobuhiro Takahashi (1991) studied Complete atrioventricular block (n=15). Vagal stimulation during sympathetic ganglion stimulation vs. Sympathetic ganglion stimulation alone was evaluated on Heart rate (ventricular escape rhythm) (p=<0.05). In dogs with complete atrioventricular block, vagal stimulation significantly decreased the ventricular escape rhythm heart rate elevated by sympathetic ganglion stimulation from 78 to 71 beats/min.
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