Sanford E. Warren
United States Department of Veterans Affairs
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Featured researches published by Sanford E. Warren.
The American Journal of Medicine | 1980
Sanford E. Warren; Daniel T. O'Connor
Clinical and epidemiologic data support the contention that black people have a higher incidence and severity of essential hypertension than white people, a phenomenon which is likely due to genetic factors. Physiologic profiles in such patients reveal a striking prevalence of low renin, volume-expanded hypertension, with an exaggerated propensity to sodium retention. A deficiency in the natriuretic, vasodilatory renal kallikrein-kinin system may explain these phenomena and may be of practical importance in the selection of therapy.
American Heart Journal | 1983
Sanford E. Warren; Daniel T. O'Connor; Irving M. Cohen
Absent reflex tachycardia with captopril therapy suggests blunting of circulatory reflexes, perhaps contributing to antihypertensive efficacy, and angiotensin converting enzyme inhibition may alter sympathetic function. Captopril effects on autonomic function were investigated in five severe hypertensive patients. Mean blood pressure fell in all patients (from 141 +/- 6 to 119 +/- 7 mm Hg, p less than 0.02) without orthostatic blood pressure fall or increase in heart rate (both p greater than 0.1) on captopril. Captopril did not alter baroreflex sensitivity as tested by amyl nitrile hypotension or phenylephrine hypertension (both p greater than 0.1). Comparison of these severely hypertensive patients to age matched normotensive control subjects did reveal markedly blunted baroreflex sensitivity in both the amyl nitrite test (by 89%, p less than 0.01) and the phenylephrine test (by 83%, p less than 0.01), suggesting that baseline blunting of baroreflex function may in part account for absence of reflex tachycardia. Captopril diminished the cardioacceleration after cold stress (from 61 +/- 38 to 23 +/- 43 msec, p less than 0.05) as well as the blood pressure fall after alpha-adrenergic blockade (from 46 +/- 13 to 24 +/- 9 mm Hg, p less than 0.05), suggesting diminished sympathetic stimulation of resistance vessels and decreased sympathetic participation in blood pressure maintenance, possibly at the prejunctional synaptic level. Four biochemical indices of sympathetic activity did not change. Thus captopril-treated patients had blunted reflex tachycardia, commensurate with blunted baroreflex function at baseline, and physiologic and pharmacologic evidence of diminished sympathetic activity was obtained with captopril therapy. Whether diminished sympathetic activity is involved in captoprils antihypertensive effect has not been determined.
JAMA | 1980
Sanford E. Warren; Daniel T. O'Connor
JAMA | 1980
Sanford E. Warren; John A. Mitas; Aron R. Swerdlin
JAMA | 1979
Sanford E. Warren; Darrell D. Fanestil
JAMA Internal Medicine | 1979
Sanford E. Warren; Edward Ebert; Aron-Hirsz Swerdlin; Steven M. Steinberg; Richard A. Stone
Renal Failure | 1978
Sanford E. Warren; Daniel T. O'Connor; Steven M. Steinberg
American Heart Journal | 1982
B.C. Joswig; Matthew U. Glover; J.B. Handler; Sanford E. Warren; W.V.R. Vieweg
Catheterization and Cardiovascular Diagnosis | 1980
Valmik Bhargava; Sanford E. Warren; W. V. R. Vieweg; Ralph Shabetai
JAMA | 1983
Sanford E. Warren; Coleman Mosley