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KMID : 0352119960120010060
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Journal of Kyung Hee University
1996 Volume.12 No. 1 p.60 ~ p.65
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Variation in Arterial and End-Tidal Carbon Dioxide Tension Difference under General Anesthesia in the Kidney Position
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Abstract
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The monitoring of end-tidal carbon dioxide tension (PETCO2)by capnography is becoming increasing common in operation rooms. PETCO2 is often used as an estimate of arterial carbon dioxide tension (PaCO2) with understanding that PaCO2 usually
exceeds
PETCO2.
However, the arterial to end-tidal carbondioxide difference [P(a-ET)CO2] was related to the many factors (lung diseases, age, systolic blood pressure and position).
We evaluated P(a-ET)CO2 during general anesthesia in 20 patients scheduled for renal surgery in the kidney position.
The PaCO2 and PETCO2, heart rate, mean arterial blood pressure and esophageal temperature were measured at following intervals: 10min after induction of anesthesia; at 5min, 35min and 65min after placement in the kidney position; after skin
closure;
5min after replacement in the supine position.
There were no significant changes in PaO2 and PaCO2. However, PETCO2 decreased and P(a-ET)CO2 increased significantly from 35min after placement in the kidney position to 5min after replacement in the supine position (p<0.05). P(a-ET)CO2 at 5min
after
replacement in the supine position was significantly decreased compared to the value at after skin closure (P<0.05).
In conclusion, P(a-ET)CO2 increases when patients are placed in the kidney position and may vary with prolongation of anesthesia. Therefore capnography must be used in conjunction with arterial gas measurement.
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