Expediency and Safety of Using Non-Invasive Methods to Control Gas Exchange Parameters During Surgeries in the Prone Position

O.A. Rud


The objective of our study was to test the adequacy of the reflection of gas exchange parameters by using non-invasive methods (capnometry, pulse oximetry) during percutaneous nephrolithotripsy in the prone position under general anesthesia.
Materials and Methods. Patients underwent arterial blood gas analysis, and we compared their results with the data of non-invasive methods at three points: in 10 min after intubation; in 10 min after prone positioning and removing the roller of operating table; in 10 min after putting down the roller of operating table.
Results. Patients in all measurement points had no statistically significant difference between the indices of SpO2 and SO2 (р > 0.05). P(a-Et)CO2 in the supine position and in the prone position without roller comprised 3.70 ± 0.51 mmHg and 3.80 ± 0.73 mmHg respectively. There was no statistically significant difference between the indices (p = 0.361). The findings are fully comply with the norm. In the prone position with extended roller of operating table in the epigastric region ­P(a-Et)CO2 was 7.10 ± 0.78 mmHg (the difference is statistically significant in comparison with the first and third stages of the operation, р < 0.05). The value of CO2 gradient does not exceed the allowable values — up to 10 mmHg.


capnometry; oximetry; prone position; percutaneous nephrolithotripsy


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