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Effect of epidural block on the lag time of pulse oximeter response
Author(s) -
XUE F. S.,
LIAO X.,
TONG S. Y.,
LIU Q. H.,
AN G.,
LUO L. K.
Publication year - 1996
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/j.1365-2044.1996.tb15041.x
Subject(s) - medicine , tuohy needle , anesthesia , epidural block , lumbar , pulse (music) , epidural space , bupivacaine , catheter , surgery , detector , electrical engineering , engineering , seldinger technique
Summary 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 C 7 ‐T 2 vertebrae in group 1 and between L 3 ‐S 1 in group 2 and an epidural catheter was introduced. Arterial oxygen saturation (Spo 2 ) 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).