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Beta Blockers Induce Different Intrarenal Effects in Humans: Demonstration by Selective Infusion of Tertatolol and Propranolol
Author(s) -
Nitenberg A.,
Chemla D.,
Blanchet F.,
Guery O.,
Prost JF.,
DutrayDupagne C.
Publication year - 1990
Publication title -
the journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 116
eISSN - 1552-4604
pISSN - 0091-2700
DOI - 10.1002/j.1552-4604.1990.tb03573.x
Subject(s) - renal blood flow , medicine , propranolol , renal circulation , vascular resistance , filtration fraction , arteriovenous oxygen difference , extraction ratio , cardiac output , renal function , renal artery , pah clearance , effective renal plasma flow , cardiology , hemodynamics , kidney , heart rate , blood pressure , stroke volume , chemistry , chromatography , extraction (chemistry)
The effects of tertatolol and propranolol on renal circulation were studied in patients with normal renal function to test the hypothesis that various beta blockers may have different vasomotor effects within the renal vascular bed. Left renal blood flow was measured by the continuous thermodilution method before (t 0 ), and 5 (t 1 ), 10 (t 2 ), 20 (t 3 ), and 30 (t 4 ) minutes after a selective infusion of tertatolol (0.25 mg, N = 4) or propranolol (2.5 mg, N = 4) into the left renal artery. Heart rate, cardiac output, aortic and right atrial pressures, and systemic vascular resistances did not significantly vary after either drug throughout the study. Plasma renin activity and plasma aldosterone in arterial and renal venous blood started to decrease at t 1 after each drug. After propranolol, renal blood flow, renal vascular resistance and the renal arteriovenous oxygen difference were unchanged. Conversely, after tertatolol at t 3 , renal blood flow was increased (from 426 ± 18 mL/min/1.73 m 2 to 509 ± 56 mL/min/1.73 m 2 , P = .03), renal vascular resistance and renal arteriovenous oxygen difference were decreased ( P < .001), and the renal blood flow/cardiac output ratio was increased ( P = .03). The filtration fraction did not vary after either drug, as attested by the unchanged polyfructosan extraction coefficient. This clinical study shows that selective infusion of a single low dose of tertatolol into the renal artery results in a delayed intrarenal vasodilator effect, while at the dose tested propranolol does not modify renal hemodynamics.