Abstract：
:Hypothalamic stimulation generally inhibits baroreflex-induced bradycardia. However, we have noted discrete areas of the rat hypothalamus which facilitate reflex bradycardia. The effects of hypothalamic stimulation on baroreflex-induced changes in heart rate were investigated in urethane-anesthetized rats (1.2 g/kg, i.p.; n = 6) instrumented with femoral arterial and venous catheters. Bipolar electrodes (250 micron diameter) were implanted stereotaxically in the hypothalamus. Baroreflex-induced bradycardia was elicited by phenylephrine (PE) injection (8-20 micrograms/kg). Responses to stimulation (STIM) (50-150 microA, 80 Hz, 0.5 ms), PE, and Stim + PE were studied for 1 min. In the ventral medial and anterior hypothalamus, STIM caused transient increases in blood pressure and no changes in heart rate. Peak blood pressure was lower during STIM + PE than during PE (144 +/- 5 vs 164 +/- 3 mm Hg; P less than 0.05). However, STIM + PE resulted in a lower heart rate compared to PE (194 +/- 22 22 vs 270 +/- 17 bpm; P less than 0.05). At 1 min, the heart rate in STIM + PE rats remained lower than in PE rats (205 +/- 37 vs 319 +/- 16 bpm; P less than 0.05). Atropine administration indicated that the facilitation was primarily parasympathetic in nature. These results identify specific hypothalamic regions which facilitate baroreflex-induced bradycardia by parasympathetic mechanisms.
journal_name
Brain Resjournal_title
Brain researchauthors
Pardini BJ,Patel KP,Schmid PG,Lund DDdoi
10.1016/0006-8993(86)91163-7subject
Has Abstractpub_date
1986-10-08 00:00:00pages
274-81issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(86)91163-7journal_volume
384pub_type
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