Effect of hypothermia and sampling site on blood esmolol concentrations.

Abstract:

:Esmolol hydrochloride was administered by constant-rate continuous infusion to 10 patients undergoing hypothermic cardiopulmonary bypass for coronary artery revascularization surgery. After a suitable loading dose, the esmolol infusion was started approximately 30 minutes before bypass and was stopped 10 minutes after termination of bypass. Esmolol concentrations were measured in arterial and venous blood samples collected before and after bypass and in samples taken from the inflow and outflow ports of the membrane oxygenator during bypass. Blood esmolol concentrations increased during hypothermia in a manner that correlated significantly and inversely with temperature. All patients were separated from the extracorporeal circulation without difficulty, and the average arterial esmolol concentration was slightly below the prebypass concentration within minutes of discontinuing bypass. Esmolol disappeared from the blood rapidly on terminating the infusion. There was no difference between esmolol concentrations measured simultaneously from the inflow and outflow ports of the membrane oxygenator during bypass, but radial arterial esmolol concentrations before and after bypass were on average about sevenfold higher than forearm venous esmolol concentrations during the esmolol infusion. The results of this study lead to two important conclusions: (1) in vivo clearance of esmolol demonstrates acute temperature dependence and (2) esmolol is removed irreversibly as it passes through the microcirculation of the hand, making measurement of peripheral esmolol concentrations markedly dependent on sampling site (arterial versus venous).

journal_name

J Clin Pharmacol

authors

Jacobs JR,Croughwell ND,Goodman DK,White WD,Reves JG

doi

10.1002/j.1552-4604.1993.tb04670.x

subject

Has Abstract

pub_date

1993-04-01 00:00:00

pages

360-5

issue

4

eissn

0091-2700

issn

1552-4604

journal_volume

33

pub_type

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