Effects of volatile anesthetics on ryanodine-treated ferret cardiac muscle.

Abstract:

:The volatile anesthetics halothane, isoflurane, and sevoflurane depress myocardial contractility by decreasing transsarcolemmal Ca2+ influx, Ca2+ release from the sarcoplasmic reticulum, Ca2+ sensitivity of the contractile proteins, and cross-bridge performance. The aim of this study is to assess and compare the effects of halothane, isoflurane, and sevoflurane on contractility in conditions in which sarcoplasmic reticulum Ca2+ release is abolished by pretreatment with ryanodine. Ferret right ventricular papillary muscles were exposed to ryanodine at 10(-6) M and then to incremental concentrations of halothane, isoflurane, or sevoflurane. In the presence of ryanodine, each anesthetic decreased isometric and isotonic contractility in a reversible, concentration-dependent manner with no differences between anesthetics and with little or no effect on time variables. It is likely that differences between anesthetic effects on contraction amplitude in isometric and isotonic twitches reside in their effects on the sarcoplasmic reticulum.

journal_name

J Cardiovasc Pharmacol

authors

Housmans PR,Bartunek AE

doi

10.1097/00005344-200108000-00006

subject

Has Abstract

pub_date

2001-08-01 00:00:00

pages

211-8

issue

2

eissn

0160-2446

issn

1533-4023

journal_volume

38

pub_type

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