Correlation of simultaneously obtained capillary, venous, and arterial blood gases of patients in a paediatric intensive care unit
- 1Çukurova University, Faculty of Medicine, Department of Pediatrics, Pediatric Intensive Care Unit, 01330, Adana, Turkey
- 2Çukurova University, Faculty of Medicine, Department of Pediatrics, Division of Neonatology, 01330, Adana, Turkey
- 3Çukurova University, Faculty of Medicine, Pediatric Emergency Care Unit, 01330, Adana, Turkey
- 4Çukurova University, Faculty of Medicine, Department of Biostatistics, 01330, Adana, Turkey
- Correspondence to:
Dr D Yıldızdas
Çukurova University, Faculty of Medicine, Paediatrıc Intensive Care Unit, 01330, Adana, Turkey;
- Accepted 15 March 2003
Aims: To investigate the correlation of pH, partial pressure of oxygen (PO2), partial pressure of carbon dioxide (PCO2), base excess (BE), and bicarbonate (HCO3) between arterial (ABG), venous (VBG), and capillary (CBG) blood gases.
Methods: Patients admitted to the paediatric intensive care unit (PICU) in Çukurova University between August 2000 and February 2002 were enrolled.
Results: A total of 116 simultaneous venous, arterial, and capillary blood samples were obtained from 116 patients (mean age 56.91 months, range 15 days to 160 months). Eight (7%) were neonates. Sixty six (57%) were males. pH, PCO2, BE, and HCO3 were all significantly correlated in ABG, VBG, and CBG. Correlation in PO2 was also significant, but less so. Correlation between pH, PCO2, PO2, BE, and HCO3 was similar in the presence of hypothermia, hyperthermia, and prolonged capillary refilling time. In hypotension, correlation in PO2 between VBG and CBG was similar but disappeared in ABG–VBG and ABG–CBG.
Conclusions: There is a significant correlation in pH, PCO2, PO2, BE, and HCO3 among ABG, VBG, and CBG values, except for a poor correlation in PO2 in the presence of hypotension. Capillary and venous blood gas measurements may be useful alternatives to arterial samples for patients who do not require regular continuous blood pressure recordings and close monitoring of PaO2. We do not recommend CBG and VBG for determining PO2 of ABG.
- ABG, arterial blood gases
- BE, base excess
- CBG, capillary blood gases
- PCO2, partial pressure of carbon dioxide
- PICU, paediatric intensive care unit
- PO2, partial pressure of oxygen
- RDS, respiratory distress syndrome
- VBG, venous blood gases