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Connecting two worlds: positive correlation between physicochemical approach with blood gases and pH in pediatric ICU
Chanapai Chaiyakulsil1, Papope Mueanpaopong2, Rojjanee Lertbunrian3
1Division of Pediatric Critical Care, Department of Pediatrics, Faculty of Medicine, Thammasat University, Bangkok, Thailand.
Insights
The effective strong ion difference correlates with blood gas pH in critically ill children, advancing acid-base disturbance management. This study supports further research into physicochemical approaches for pediatric critical care.
Area of Science:
- Pediatric Critical Care Medicine
- Clinical Chemistry
- Physiology
Background:
- The physicochemical approach, including strong ion difference, offers a novel framework for understanding and managing acid-base disturbances.
- Current application of physicochemical principles in pediatric critical care is limited, necessitating further investigation.
- Accurate assessment of acid-base balance is crucial for managing critically ill pediatric patients.
Purpose of the Study:
- To evaluate the correlation between the physicochemical approach and blood gas pH for acid-base determination in critically ill pediatric patients.
- To explore the utility of various physicochemical parameters in assessing acid-base status in this population.
Main Methods:
- Analysis of 1338 paired blood gas and physicochemical measurements from 130 critically ill pediatric patients.
- Inclusion of a metabolic subgroup for detailed analysis (743 paired measures).
- Correlation analysis between physicochemical parameters (effective strong ion difference, simplified and apparent strong ion difference, strong ion gap, sodium chloride gap) and blood gas pH, alongside traditional measures (standard base excess, lactate, chloride, bicarbonate).
Main Results:
- The effective strong ion difference demonstrated the strongest correlation with blood gas pH in the overall cohort (R=0.398, p<0.001) and the metabolic subgroup (R=0.685, p<0.001).
- Other physicochemical parameters and traditional measures also exhibited varying degrees of correlation with blood gas pH.
- A significant positive correlation was observed between physicochemical parameters and blood gas pH.
Conclusions:
- Physicochemical parameters, particularly the effective strong ion difference, show a positive correlation with blood gas pH in critically ill pediatric patients.
- These findings support the potential of the physicochemical approach for evaluating acid-base disturbances in pediatric critical care.
- Further research is warranted to fully integrate physicochemical principles into the management of acid-base balance in pediatric patients.
Objective:
Physicochemical approach such as strong ion difference provides a novel concept in understanding and managing acid-base disturbance in patients. However, its application in pediatrics is limited. This study aimed to evaluate a correlation between the physicochemical approach and blood gas pH for acid-base determination in critically ill pediatric patients.
Results:
A total of 130 pediatric patients were included, corresponding to 1338 paired measures for analyses. Of these, the metabolic subgroup (743 paired measures) was defined. Among physicochemical parameters, the effective strong ion difference showed the best correlation with the blood gas pH in the whole cohort (R = 0.398; p < 0.001) and the metabolic subgroup (R = 0.685; p < 0.001). Other physicochemical parameters (i.e., the simplified and the apparent strong ion difference, the strong ion gap, and the sodium chloride gap) and the traditional measures (standard base excess, lactate, chloride and bicarbonate) also showed varying degrees of correlation. This study revealed the positive correlation between physicochemical parameters and the blood gas pH, serving as a connecting dot for further investigations using physicochemical approach to evaluate acid-base disturbance in pediatric population.
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