Somatosensory evoked potentials during hypoxia and hypocapnia in conscious humans

被引:12
|
作者
Ledsome, JR
Cole, C
SharpKehl, JM
机构
[1] UNIV BRITISH COLUMBIA,DEPT PHYSIOL,VANCOUVER,BC,CANADA
[2] UNIV BRITISH COLUMBIA,DEPT ANAESTHESIA,VANCOUVER,BC,CANADA
[3] VANCOUVER GEN HOSP,MICROGRAV LIFE SCI RES UNIT,VANCOUVER,BC,CANADA
来源
CANADIAN JOURNAL OF ANAESTHESIA-JOURNAL CANADIEN D ANESTHESIE | 1996年 / 43卷 / 10期
关键词
hypocapnia; hypoxia; monitoring; evoked potentials;
D O I
10.1007/BF03011904
中图分类号
R614 [麻醉学];
学科分类号
100217 ;
摘要
Purpose: The objective of the study was to evaluate the effects of moderate hypoxia and hypocapnia on the latency and amplitude of cortical somatosensory evoked potentials (SSEPs) in conscious human subjects. Methods: In ten volunteers the amplitude and latency of the cortical somatosensory evoked potentials were recorded during stimulation of the left posterior tibial nerve. Measurements of SSEPs and respiratory variables were made breathing ambient air, air containing a reduced oxygen percentage (17% O-2, 14% O-2 (n = 6) or 11% O-2 (n = IO)), and again dur ing voluntary hyperventilation breathing ambient air (PETCO(2) = 20 mmHg, n = IO). Results: Hypoxia (11% O-2) caused mild stimulation ventilation (P < 0.05) but had no effects on the latency or amplitude of the SSEP. Lesser degrees of hypoxia had no effects. Hyperventilation caused a small (2-4%) decrease) in the latency of the SSEP and an increase in the amplitude of the SSEP (P < 0.05). Conclusions: These findings in conscious subjects were consistent with previous observations in anaesthetized humans and anaesthetized dogs and show that the decrease in latency of the SSEP associated with hypocapnia is not due to changes in the depth of anaesthesia. These effects of hypocapnia may contribute to small variations in the latency of the SSEP when monitoring is performed during surgery, bur are unlikely to be large enough to be of clinical concern.
引用
收藏
页码:1025 / 1029
页数:5
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