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Parathyroid hormone and the vascular response to norepinephrine
1Second Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
American Journal of Hypertension
|August 1, 1990
Summary
High parathyroid hormone (PTH) levels in uremia reduce blood pressure response to norepinephrine. Parathyroidectomy improved this vascular responsiveness in hemodialysis patients, suggesting PTH actively impairs norepinephrine
Area of Science:
- Nephrology
- Endocrinology
- Cardiovascular Physiology
Background:
- Uremia is associated with reduced blood pressure reactivity to norepinephrine.
- This diminished pressor response is often attributed to elevated parathyroid hormone (PTH) levels.
- Existing research provides mixed evidence on the direct impact of high PTH on vascular responsiveness.
Purpose of the Study:
- To investigate the role of excess parathyroid hormone (PTH) in reduced norepinephrine blood pressure reactivity in uremic patients.
- To determine the effect of parathyroidectomy on vascular responsiveness to norepinephrine in hemodialysis patients.
Main Methods:
- Norepinephrine infusion tests were conducted in hemodialysis patients before and after parathyroidectomy.
- Vascular responsiveness was assessed by measuring blood pressure changes in response to a standardized norepinephrine infusion (100 ng/kg/min).
Main Results:
- Vascular response to norepinephrine significantly improved after parathyroidectomy.
- Blood pressure increase was 11.3 +/- 1.3 mm Hg before parathyroidectomy and 17.5 +/- 2.4 mm Hg after (P < .01).
Conclusions:
- Excess parathyroid hormone (PTH) plays an active role in the reduced vascular responsiveness to norepinephrine observed in uremia.
- The precise mechanisms underlying PTH's effect on vascular responsiveness remain to be elucidated.