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- W3140897036 abstract "We studied the time-dependent changes in the response of heart rate (sinus cycle length) to 30-second trains of vagal stimulation (8 Hz), repeated every 2 minutes, in canine neonates aged 7.1 +/- 2.5 (mean +/- SD) days. The first vagal train prolonged the sinus cycle length by 58 +/- 35%, but the response was attenuated during subsequent trains (98 +/- 5% inhibition of the vagal response after only 6.4 +/- 1.7 trains). After 40 minutes, complete restoration of the chronotropic response could be demonstrated. Receptor desensitization could be excluded as the reason for the attenuation by demonstrating preserved responses to exogenous acetylcholine. Neuropeptide Y, a sympathetic cotransmitter that has been shown to attenuate parasympathetic responses (thought to be the result of inhibition of the release of acetylcholine from parasympathetic nerve terminals), was administered (50 micrograms/kg) to eight newborns. Exogenous neuropeptide Y resulted in a complete inhibition of the chronotropic response to vaga..." @default.
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- W3140897036 date "1991-01-01" @default.
- W3140897036 modified "2023-09-26" @default.
- W3140897036 title "Rapid attenuation (fade) of the chronotropic response during vagal stimulation in the canine newborn. Evidence for a prominent neuropeptide Y effect." @default.
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