Comparison of Arterial Blood Gases by both Invasive and Non-Invasive Methods During the Weaning from Mechanical Ventilation in Patients Undergoing Cardiac Surgery

Due to the side effects of invasive techniques, the use of non-invasive techniques with continuous monitoring has been considered by health centers. In this study, invasive and non-invasive techniques for monitoring arterial blood gases were compared during patientschr('39') weaning from mechanical ventilation after cardiac surgery.

In a descriptive-cross-sectional study, 70 patients who were candidates for cardiac surgery were assessed during 1397 at Jamaran Heart Hospital and the values for oxygen saturation and carbon dioxide measured by non-invasive methods (pulse oximetry and capnography) and invasive (ABG) were compared

The results of the study showed that there is a difference of 1.7±4.54 between the copography and PaCO2 values, and a difference of 0.92±2.29 between the SPO2 and SaO2 values. There was a positive and significant correlation between ETCO2 and PaCO2 (P<0.001, r=0.43). There was also a correlation between SPO2 and SaO2 numbers (P=0.03, r=0.25). The results of the linear regression test showed that ETCO2 and SPO2 can predict PaCO2 and SaO2 using the following formula, respectively. PaCO2=20.61+0.45(ETCO2), SaO2=63.65+0.25(SPO2).

Capnography and pulse oximetry can be used as non-invasive, inexpensive, and safe methods in weaning patients from mechanical ventilation after cardiac surgery. For a more detailed examination, it is recommended that studies be performed with a larger sample size, as well as in patients with different physical conditions and severity of the disease.