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Cerebral Circulation and Metabolism during Enflurane Anesthesia in Man

The bulletin of the Yamaguchi Medical School Volume 30 Issue 1 Page 39-45
published_at 1983-12
A020030000105.pdf
[fulltext] 571 KB
Title
Cerebral Circulation and Metabolism during Enflurane Anesthesia in Man
Creators Fujii Seigo
Source Identifiers
Creator Keywords
Anesthetics enflurane Brain blood flow oxygen consumption glicose consumpution
The effects of enflurane anesthesia on cerebral blood flow (CBF) and cerebral metabolic rate for oxgen (CMRo2) were studied in patients. The patients were divided into two groups according to the deph of anesthesia, I.e.,group I, 2% inspried enflurane, and group II, 3.5% inspired enfulurane. Cerebral perfusion pressure (CCP) was maintained above 60 mmHg with phenylephrine. In group I, patients were studied before surgery, while in group II, the measurements were performed before and surgery. In groupe I (enflurane concentration in the arterial blood, 15mg/dl),mean CBF and CMRo2 were 53 and 2.8 ml/100g/min,respectively. These values were not significantly different from CBF (46ml/100g/min) and CMRo2 (3.1 ml/100g/min) in the awake patients. The electroencephalogram (EEG) showed pregominant activities between 12 and 15 Hz with amplitude of 50 to 100чV with nterior dominance. In group II before surgery (enflurance concentration, 27 mg/dl), mean CBF (61 ml/100g/min) and CMRo2 (2.6 ml/100g/min) were significantly diferent from the awake values, while the EEG showed frequent spikes and suppression. In group II during surgery (enflurance concentration 27 mg/dl), mean CBF (67 ml/100g/min) and CMRo2 (2.6 ml/100g/min) were not defferent from the values before surgery despite significant EEG changes (decreased spiking increased suppression) The results indicate that enflurane is a cerebral vasodilator and causes an increse in CBF and a decrese in CMRo2 in man at an anesthetic level characterized by frequent spikes and suppression on the EEG. Nochanges in CBF and CMRo2 despite EEG changes with surgical stimulation suggest redistribution of flow coupled with metabolism.
Subjects
医学 ( Other)
Languages eng
Resource Type departmental bulletin paper
Publishers Yamaguchi University Graduate School of Medicine
Date Issued 1983-12
File Version Version of Record
Access Rights open access
Relations
[ISSN]0513-1812
[NCID]AA00594272
Schools 医学部