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KMID : 0356920110610020138
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Korean Journal of Anesthesiology
2011 Volume.61 No. 2 p.138 ~ p.142
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Effect of airway pressure on lumbar epidural pressure during positive pressure ventilation
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Han Sun-Sook
Lim Young-Jin
Jeon Yun-Seok
Min Kyoung-Beom
Ahn Won-Sik
Lee Sang-Chul
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Abstract
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Background: The purpose of this study was to measure lumbar epidural pressure (EP) during the insertion of a Tuohy needle under general anesthesia and to evaluate the influence of airway pressure on EP.
Methods: Lumbar EP was measured directly through a Tuohy needle during intermittent positive pressure ventilation in fifteen patients. Mean and peak EP were recorded after peak inspiratory pressures (PIP) of 0, 15, and 25 cmH2O.
Results: All measured lumbar EPs were positive, with the pressure increasing during inspiration and decreasing during expiration. Median EP was 6.0 mmHg (interquartile range, 4.0-8.0) at 0 cmH2O of PIP, 6.5 mmHg (4.5-8.5) at 15 cmH2O, and 8.5 mmHg (6.0-10.5) at 25 cmH2O, increasing significantly at 15 cm H2O PIP, and further increasing at 25 cmH2O (P < 0.001).
Conclusions : We demonstrate the influence of increased airway pressure on lumbar EP measured directly through a Tuohy needle. Lumbar EPs were positive, and increasing PIP levels significantly increased lumbar EP.
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KEYWORD
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Epidural pressure, General anesthesia, Lumbar
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