The comparative effects of equimolar sevoflurane and isoflurane in isolated hearts. Anesth Analg 1995 Nov;81(5):1026-32
Date
11/01/1995Pubmed ID
7486042DOI
10.1097/00000539-199511000-00023Scopus ID
2-s2.0-0028839162 (requires institutional sign-in at Scopus site) 22 CitationsAbstract
The aim of this study was to compare the direct effects of equivalent molar concentrations of sevoflurane (SEVO) and isoflurane (ISO) on electrophysiology, mechanical function, metabolism, and perfusion in isolated hearts, independent of neuronal, humoral, or hemodynamic influences. Three equimolar concentrations of SEVO or ISO were administered randomly in each of 14 guinea pig hearts perfused by the Langendorff technique. Spontaneous heart rate (HR), atrioventricular (AV) conduction time, left ventricular pressure (LVP), and coronary flow (CF) were measured directly. To differentiate a direct vasodilatory effect from an indirect metabolic effect due to autoregulation of CF, arterial and coronary sinus oxygen tension were measured continuously to calculate oxygen delivery (Do2), myocardial oxygen consumption (MVo2), percent O2 extraction, and cardiac efficiency. Linear slope analysis (cardiac effect as a function of 0.1 mM anesthetic concentration) was used to compare anesthetic effects. Only AV time was increased more (P < 0.05) by ISO (+1.8 ms per 0.1 mM) than by SEVO (+1.1 ms per 0.1 mM). CF tended to be higher with ISO (+0.7 mL.g-1.min-1 per 0.1 mM) than SEVO (0.4 mL.g-1.min-1 per 0.1 mM) but this was not significant. HR (ISO, -1.4% per 0.1 mM; SEVO, -1.7% per 0.1 mM), LVP (ISO, -5.8% per 0.1 mM; SEVO, -5.1% per 0.1 mM), and percent O2 extraction (ISO, -6.1% per 0.1 mM; SEVO, -5.8% per 0.1 mM) were decreased similarly by both anesthetics and these effects were accompanied by proportional decreases in MVo2 (ISO, -34% +/- 4%, SEVO, -37% +/- 6%) at the highest concentrations (0.53 mM). Neither anesthetic altered cardiac efficiency.(ABSTRACT TRUNCATED AT 250 WORDS)
Author List
Graf BM, Vicenzi MN, Bosnjak ZJ, Stowe DFAuthor
David F. Stowe MD, PhD Professor in the Anesthesiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnestheticsAnimals
Blood Pressure
Coronary Circulation
Dose-Response Relationship, Drug
Ethers
Guinea Pigs
Heart
Heart Conduction System
Heart Rate
Isoflurane
Methyl Ethers
Oxygen