Effect of airway pressure on lumbar epidural pressure during positive pressure ventilation.
10.4097/kjae.2011.61.2.138
- Author:
Sun Sook HAN
1
;
Young Jin LIM
;
Yunseok JEON
;
Kyoung Beom MIN
;
Won sik AHN
;
Sang Chul LEE
Author Information
1. Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, Korea. limyjin@snu.ac.kr
- Publication Type:Original Article
- Keywords:
Epidural pressure;
General anesthesia;
Lumbar
- MeSH:
Anesthesia, General;
Humans;
Intermittent Positive-Pressure Ventilation;
Needles;
Positive-Pressure Respiration
- From:Korean Journal of Anesthesiology
2011;61(2):138-142
- CountryRepublic of Korea
- Language:English
-
Abstract:
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.
