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Continuous monitoring of oxygen tension with a transcutaneous sensor during hypotensive anesthesia
Author(s) -
Megerman J.,
Mihelakos P. Th.,
Katsamouris A. N.,
Fahmy N. R.,
Lappas D. G.,
Abbott W. M.
Publication year - 1987
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.1987.tb02514.x
Subject(s) - medicine , arterial oxygen tension , anesthesia , sodium nitroprusside , blood pressure , mean arterial pressure , oxygen tension , cardiology , oxygen , heart rate , nitric oxide , chemistry , organic chemistry , lung
Transcutaneous oxygen tension (TCPo 2 ) is a useful noninvasive technique for monitoring arterial oxygen tension under stable circulatory conditions. This study was undertaken to determine if TCPo 2 is also reliable during sodium nitroprusside‐induced hypotension under general anesthesia. Arterial blood gases and TCPo 2 were measured prior to inducing hypotension (baseline), at 20‐min intervals during hypotension, and when systemic arterial pressure had returned to within 10% of the control (pre‐hypotension) value. With induced hypotension, Pao 2 and TGPo 2 decreased significantly (P<0.05), and were well correlated by linear regression (r>0.85); however, regressions were strongly dependent on the individual patient. The mean regression line for all patients as a group was given by TCPo 2 = 0.69 Pao 2 + 20.7 mmHg (r = 0.93, P <0.01); significantly different regressions were obtained for each patient ( P <0.0001). Comparing changes in TCPo 2 versus those in Pao 2 (relative change from baseline values) did not substantially reduce the variability among patients. It is concluded that TCPo 2 reliably reflects changes in arterial oxygen tension during controlled hypotension under general anesthesia, but that a separate calibration of TCPo 2 vs. Pao 2 , obtained prior to inducing hypotension, may be required for each individual patient.