Sumera Mahar Inayat Ali Khan Tauseef Ali Memon Aakash Maryam Jamil Ameera Shabbir


Objective: The present study aimed at the comparison of central venous blood gas (CVBG) and arterial blood gas (ABG) in the management of the selected patients in the emergency department and critical care unit (CCU). Study design: A comparative study. Place and Duration This study was conducted in University Hospital Kerry Ireland from January 2022 to January 2023. Methodology: The study included 80 patients that were critically ill and presented to CCU and the emergency room. ABGs and CVBGs measurements of B.E, K+, pCO2, and pH were taken. Other variables were noted simultaneously. A comparison of values of B.E, K+, pCO2, and pH of ABG and CVBG was done by application of a t-test. The sample was taken either from the arterial catheter or by a direct puncture. The blood was analyzed by a blood gas analyzer. The venous sample was taken using a central catheter. The amount of blood taken for CVBG analysis was 5 ml out of which, 0.1 ml was carried in a heparinized syringe. Results: The study consisted of 80 patients out of which 52 (65%) were male and 28 (35%) were female. 22 (27.5%) were from the age group 18 years to 30 years. 32 (40%) patients were from the age group 31 years to 60 years. The remaining 26 (32.5%) patients were from the age group 61 years to 90 years. According to linear regression analysis, ABG values of pH, B.E, and pCO2were correlated significantly with CVBG. Whereas, the value of K+ for ABGs and CVBGs was poorly correlated. Conclusion. Central CVBG values for pH, B.E, and pCO2 can be considered as an alternative to ABG values for making a continuous assessment in critical patients. However, the assessment of potassium levels cannot be done by CVBG values because of the difference in the level of potassium in the arterial and venous blood. The most significant benefit of using central CVBG values instead of ABG values in critically sick patients is the avoidance of recurrent arterial punctures.

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Venous pH, Blood Gas Analysis, Central CVBG, ABGs

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