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Neurovascular function during pregnancy in the spontaneously hypertensive rat
Clinical and Experimental Pharmacology & Physiology
|June 1, 1992
Summary
Blood pressure (BP) significantly drops in pregnant spontaneously hypertensive rats (SHR) during the final gestation week. Altered vascular neuroeffector function is unlikely to be the sole cause of this pregnancy-induced BP decline.
Area of Science:
- Cardiovascular Physiology
- Reproductive Biology
- Hypertension Research
Background:
- Spontaneously hypertensive rats (SHR) exhibit a dramatic decline in blood pressure (BP) during the final week of gestation.
- Understanding the mechanisms behind this BP drop is crucial for managing hypertensive disorders during pregnancy.
Purpose of the Study:
- To investigate the hypothesis that alterations in vascular neuroeffector function contribute to the pregnancy-induced BP decline in SHR.
- To compare these alterations in pregnant SHR with normotensive Wistar-Kyoto (WKY) rats.
Main Methods:
- Studied pregnant SHR and WKY rats near term.
- Assessed responses of perfused mesenteric vasculature to noradrenaline (NA) and potassium chloride (KCl).
- Evaluated responses to sympathetic nerve stimulation.
Main Results:
- A significant BP drop occurred in late gestation in both SHR and WKY rats.
- Mesenteric vascular responsiveness to NA and KCl was reduced in SHR 4 days before delivery but normalized 1 day before delivery.
- Pregnancy did not affect sympathetic nerve stimulation responses in SHR vasculature.
Conclusions:
- Dynamic changes in neurovascular function occur near delivery in pregnant SHR.
- These late-stage neurovascular changes are unlikely to be the sole cause of the significant BP decline observed in SHR during the final week of gestation.