TY - JOUR
T1 - Hemodynamic similarities between the trigeminal and aortic vasodepressor responses
AU - Kumada, M.
AU - Dampney, R. A L
AU - Whitnall, M. H.
AU - Reis, D. J.
PY - 1978
Y1 - 1978
N2 - The hemodynamic changes associated with hypotension elicited by electrical stimulation of the spinal trigeminal complex (trigeminal depressor response, TDR) or the aortic nerve (aortic depressor reflex, ADR) were compared in rabbits anesthetized with urethan. The hypotension associated with each response was accompanied by bradycardia, a marked fall in total peripheral resistance, a small decrease in cardiac output, and a nonuniform decrease in regional vascular resistances, with the order of magnitude of the decrease being femoral greater than mesenteric greater than renal arterial resistance. In individual experiments the percent decrease in heart rate, total peripheral resistance, or regional resistances was plotted against the percent fall in arterial pressure to obtain a pair of regression lines during the TDR and ADR. There was no significant difference in the slope or y-intercept of the regression line between the TDR and ADR for all of the hemodynamic variables examined. In both responses, however, the slope of the femoral resistance/arterial pressure relationship was significantly greater than that of the renal resistance/arterial pressure relationship. We conclude that the TDR is characterized by a pattern of hemodynamic changes similar to that of the ADR.
AB - The hemodynamic changes associated with hypotension elicited by electrical stimulation of the spinal trigeminal complex (trigeminal depressor response, TDR) or the aortic nerve (aortic depressor reflex, ADR) were compared in rabbits anesthetized with urethan. The hypotension associated with each response was accompanied by bradycardia, a marked fall in total peripheral resistance, a small decrease in cardiac output, and a nonuniform decrease in regional vascular resistances, with the order of magnitude of the decrease being femoral greater than mesenteric greater than renal arterial resistance. In individual experiments the percent decrease in heart rate, total peripheral resistance, or regional resistances was plotted against the percent fall in arterial pressure to obtain a pair of regression lines during the TDR and ADR. There was no significant difference in the slope or y-intercept of the regression line between the TDR and ADR for all of the hemodynamic variables examined. In both responses, however, the slope of the femoral resistance/arterial pressure relationship was significantly greater than that of the renal resistance/arterial pressure relationship. We conclude that the TDR is characterized by a pattern of hemodynamic changes similar to that of the ADR.
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M3 - Article
C2 - 623276
AN - SCOPUS:0018251727
VL - 234
JO - American Journal of Physiology
JF - American Journal of Physiology
SN - 0002-9513
IS - 1
ER -