[Volatile anesthetics suppress cardiac function in man; an investigation based on systolic time intervals].
Hemodynamic changes and left ventricular performance were investigated by simplified mechanocardiography using finger plethysmography instead of carotid artery pulse tracing in patients who received 4 volatile anesthetics with or without nitrous oxide. Systolic blood pressure (Ps), diastolic blood pressure (Pd), heart rate (HR), pre-ejection period (PEP), left ventricular ejection time (LVET), isovolemic contraction time (ICP), PEP/LVET, Pd/ICT, and 1/PEP2 were selected as indices which represent hemodynamics and systolic time intervals. Enflurane 0.6 and 1.2MAC prolonged PEP, and shortened 1/PEP2 and Pd/ICT significantly. Addition of nitrous oxide caused more depression. Halothane 0.6MAC prolonged PEP, and shortened 1/PEP2 and Pd/ICT. Sevoflurane 1.2MAC shortened only 1/PEP2. Addition of nitrous oxide prolonged PEP and PEP/LVET, and shortened Pd/ICT. Isoflurane 1.2MAC lowered Ps and increased HR. The results indicate that cardiac performance was depressed by volatile anesthetics in the order of enflurane, halothane, sevoflurane and isoflurane.
Mutoh
T
T
Department of Anesthesiology, Nippon Medical School, Tokyo.
D000328:Adult; D000777:Anesthetics / Q000494:pharmacology*; D003864:Depression, Chemical; D004737:Enflurane / Q000494:pharmacology*; D004987:Ethers / Q000494:pharmacology*; D005260:Female; D006221:Halothane / Q000494:pharmacology*; D006439:Hemodynamics / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D007530:Isoflurane / Q000494:pharmacology*; D008297:Male; D008738:Methyl Ethers; D008875:Middle Aged; D000077149:Sevoflurane
D000777:Anesthetics; D004987:Ethers; D008738:Methyl Ethers; D000077149:Sevoflurane; D004737:Enflurane; D007530:Isoflurane; D006221:Halothane