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- W2153448275 abstract "Neuropeptide Y and norepinephrine are localized in sympathetic nerve terminals throughout the heart. We sought to determine the functional distribution of the neuropeptide Y-containing sympathetic fibers to the sinus and atrioventricular (AV) nodal regions. We recorded cycle length, AV interval, and arterial pressure in 14 anesthetized dogs. We assessed the release of neuropeptide Y from sympathetic nerve terminals by measuring the attenuation of the vagal effects on cycle length and AV interval that occurred after unilateral ansa subclavia stimulation. Three-minute trains of right or left ansa stimulation, each applied at frequencies of 2, 5, and 10 Hz, produced a frequency-dependent inhibition of the vagal effects on cycle length and AV interval. After right ansa stimulation (10 Hz), however, the percent inhibition of the vagal effects on cycle length was 21 +/- 5% greater (p less than 0.001) than the percent inhibition of the vagal effects on AV interval. Conversely, after left ansa stimulation (10 Hz), the percent inhibition of the vagal effects on AV interval was 54 +/- 7% greater (p less than 0.001) than the percent inhibition of the vagal effects on cycle length. The vagal stimulus characteristics (frequency or voltage) did not significantly alter the percent inhibition, nor did the percent inhibition depend on the vagus stimulated (right or left vagus). We conclude that most of the neuropeptide Y-containing sympathetic fibers at the sinus node originate in right-sided ganglia, whereas most of those at the AV node originate in left-sided ganglia." @default.
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- W2153448275 date "1990-09-01" @default.
- W2153448275 modified "2023-09-23" @default.
- W2153448275 title "Sinus and atrioventricular nodal distribution of sympathetic fibers that contain neuropeptide Y." @default.
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- W2153448275 doi "https://doi.org/10.1161/01.res.67.3.713" @default.
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