Effects of baroreceptor reflex on efferent pulmonary sympathetic nerve activity in anesthetized cat.
Am J Physiol
; 268(4 Pt 2): R1078-83, 1995 Apr.
Article
em En
| MEDLINE
| ID: mdl-7733390
ABSTRACT
We analyzed the baroceptor reflex effect on efferent pulmonary sympathetic nerve activity (PSNA) in anesthetized cats. PSNA was recorded from the central end of the cut nerve bundle, which was isolated from the lobar artery supplying the diaphragmatic lobe. Renal sympathetic nerve activity (RSNA) and aortic blood pressure (AP) were also simultaneously measured. There were grouped discharges synchronous with cardiac cycle and its respiratory modulation in PSNA. In a given cardiac cycle, the discharge patterns differed between the pulmonary and renal nerves. Average sympathetic nerve activity and AP obtained from 100 consecutive cardiac cycles showed that the baroreceptor reflex delay time on the pulmonary nerve (266 ms) was longer than that on the renal nerve (195 ms). The data indicate nonuniformity in the cardiac-related PSNA and RSNA. The grouped PSNA disappeared with hexamethonium bromide, indicating that PSNA originates from postganglionic efferent fibers. To examine the baroreflex response of PSNA, AP was increased by 70 mmHg with phenylephrine and decreased by 70 mmHg with nitroprusside. PSNA changed inversely to the changes in mean aortic pressure (MAP). In the delta MAP-delta PSNA curve, delta PSNA reached the maximum level (74%) and the noise level at -56 +/- 4 and 58 +/- 4 mmHg, respectively. The mean slope of the curve was 1.5 +/- 0.1%/mmHg. RSNA also responded inversely to the MAP change.(ABSTRACT TRUNCATED AT 250 WORDS)
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Artéria Pulmonar
/
Sistema Nervoso Simpático
/
Barorreflexo
Limite:
Animals
Idioma:
En
Revista:
Am J Physiol
Ano de publicação:
1995
Tipo de documento:
Article