![]() Agreement between PCO2 and ETCO2 measurements was 8.4 mmHg and a precision of 11.1 mmHg.As there is only a moderate correlation between PCO2 and ETCO2 levels in COPD patients, ETCO2 measurement should not be considered as a part of the decision-making process to predict PaCO2 level in COPD patients. ![]() However, no reliable method for measuring PETCO2 during noninvasive ventilation (NIV) has been established. Mean arterial PCO2 levels were 43.24☑4.73 and mean ETCO2 levels were 34.23☑0.86 mmHg. The end-tidal partial pressure of carbon dioxide (PETCO2) can be used to estimate the arterial partial pressure of carbon dioxide (PaCO2) in patients who undergo mechanical ventilation via endotracheal intubation. ![]() SS-ETCO2 measurement and arterial blood gas analysis were carried out on 118 patients. The demographics, diagnosis, vital signs, laboratory test results and clinical outcomes of the patients were recorded. During the study period, simultaneous SS-ETCO2 measurement using a Medlab Cap 10 sidestream capnograph was performed on every COPD patient requiring arterial blood gas analysis. This prospective cross-sectional study has been carried out over a 3-month period in a tertiary care university hospital emergency department with an annual census of 75 000 visits. Cross-sectional associations between ETCO2 and PaCO2 were examined in the study. Capnography devices are employed throughout pre-hospital and hospital settings to determine how effectively a patient is ventilating. We aimed to determine the value of sidestream end-tidal carbon dioxide (SS-ETCO2) measurement in patients with chronic obstructive pulmonary disease (COPD) in the emergency department. End-tidal CO2 (ETCO2) measurements are an established, non-invasive tool for assessing critically ill patients.
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