End tidal carbon dioxide as a predictor of the arterial PCO2 in the emergency department setting

Emergency Medicine Journal : EMJ
C YosefyL Reisin

Abstract

Patients arriving in the emergency department (ED) need rapid and reliable evaluation of their respiratory status. Mainstream end tidal carbon dioxide (ETCO(2)) is one of the methods used for this purpose during general anaesthesia of intubated patients in the operating theatre. Sidestream ETCO(2) (SSETCO(2)) might be a non-invasive, rapid, and reliable predictor of arterial Pco(2) in non-intubated patients in respiratory distress. The aim of this study was to verify whether SSETCO(2) can accurately predict the arterial Pco(2) and to detect variables that may affect this correlation. A prospective semi-blind study. The participants were 73 patients (47 men, 26 women) referred to the ED for respiratory distress. Arterial blood gas pressures and SSETCO(2) measurements were performed and recorded for all patients. Other parameters recorded were: age; body temperature; respiratory rate; blood pressure; pulse rate; and medical diagnosis. A significant correlation was found between SSETCO(2) and arterial Pco(2) (r = 0.792). Compared with the correlation curve of the whole group, age under 50 years deflected the correlation curve to the left, while temperature above 37.6 degrees C deflected it to the right. The rest of the parameters ...Continue Reading

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