Effect of epidural block on the lag time of pulse oximeter response |
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| Authors: | F. S. XUE X. LIAO S. Y. TONG Q. H. LIU G. AN L. K. LUO |
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| Affiliation: | F.S. Xue, MD, Vice Professor, Fellow of the Chinese Association of Anaesthesiology (FCAA), X. Liao, MB, Resident, FCAA, S.Y. Tong, MB, Resident, FCAA, Q.H. Liu, MD, Visiting Anaesthesiologist, FCAA, G. An, MD, Vice-Professor, Head, FCAA, L.K. Luo, MD, Professor, Honorary Chairman, FCAA, Department of Anaesthesiology, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and the Peking Union Medical College, Ba-Da-Chu Road, Shi-Jing-Shan District, Beijing, People's Republic of China (PR of China) 100041. |
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| Abstract: | ![]()
Thirty-six healthy patients, ASA 1, aged 16–41 years, scheduled for elective plastic surgery were studied to determine if thoracocervical or lumbar epidural blocks affected the lag time of the pulse oximeter response. Patients were allocated to receive thoracocervical epidural block (n = 20) (group 1) (lignocaine 1 %) or lumbar epidural block (n = 16) (group 2) (lignocaine 1.5%). Epidural block was performed with a 17-gauge Tuohy needle inserted in the midline between C7-T2 vertebrae in group 1 and between L3-S1 in group 2 and an epidural catheter was introduced. Arterial oxygen saturation (Spo2) was measured continuously using a Datex pulse oximeter. The lag time of the pulse oximeter response was measured while breathing oxygen (100%) after breath-holding. Values were obtained 10min before and 5, 10, 15, 20, 30, and 40 min after epidural injection of a test dose. There was a progressive decrease in the lag time of the pulse oximeter response so that by 30 min after epidural injection the mean (SD) value had decreased from 29 (6.1) to 14 (3.4) in Group 1 and 41 (12.8) to 23 (7.9) s in group 2 (p < 0.01). |
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| Keywords: | Anaesthetic techniques, regional epidural Measurement techniques pulse oximetry |
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