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Changes in the T‐wave amplitude of ECG during isoflurane anaesthesia
Author(s) -
ANNILA P.,
JANTTI V.,
LINDGREN L.,
YLIHANKALA A.
Publication year - 1993
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1993.tb03775.x
Subject(s) - isoflurane , medicine , anesthesia , amplitude , heart rate , qrs complex , burst suppression , blood pressure , cardiology , electroencephalography , physics , quantum mechanics , psychiatry
R/T‐wave amplitude ratio of electrocardiogram (ECG), heart rate (HR) and systolic arterial pressure (SAP) were recorded in 15 patients awake, at 1 minimal alveolar concentration of isoflurane before and during surgery, and in deep anaesthesia (electroencephalogram burst suppression) during surgery. R/T‐wave amplitude ratio and HR were sensitive to both surgery and changes in the level of isoflurane anaesthesia; induction of anaesthesia, skin incision and the rapid increase in the concentration of isoflurane all significantly decreased the T‐wave amplitude, without influence on the R‐wave. Changes in the T‐wave amplitude correlated directly to HR. SAP increased at skin incision and decreased when the anaesthesia was deepened. The authors conclude that the R/T‐wave amplitude ratio of ECG provides a reliable method for monitoring the sympathetic tone during isoflurane anaesthesia.