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Angiology
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Norepinephrine and Forearm Vascular Resistance Responses to Tilt and Cold Pressor Test in Essential Hypertension: Effects of Aging

James R. Sowers, M.D.

Division of Endocrinology, Hypertension, Wayne State University, Detroit, Michigan

Pramod K. Mohanty, M.D., F.A.C.A.

Cardiology Division, V.A. Medical Center & Medical College of Virginia, Richmond, Virginia

Heart rate, blood pressure, forearm vascular resistance (FVR), and catecholamine and renin responses to head-up tilt at 80 degrees and cold pressor test were investigated in 15 hypertensive men aged less than fifty-five (mean 44 ± 7 years; M ± SD) and 13 similarly hypertensive men aged more than fifty-five (mean 62 ± 4 years; M±SD). Baseline plasma norepinephrine levels, as well as norepinephrine responses to tilt and cold pressor stress, were similar in the two groups, suggesting a lack of age-related increase in plasma norepi nephrine (NE) responses in patients with essential hypertyension. Normalized FVR responses (% change) to tilting (28 ± 21 vs 95 ± 36; M ± SE) and cold pressor test (33 ± 12 vs 64±21; M ± SE) were signifiantly less (p<0.01) in older hypertensives. These results, but not the plasma NE responses to reflex sym pathetic activation by tilt and cold pressor testing in older hypertensives, sug gest an impaired forearm vasoconstriction.

Angiology, Vol. 40, No. 10, 872-879 (1989)
DOI: 10.1177/000331978904001003
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