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Functional residual capacity in anesthetized children: normal values and values in children with cardiac anomalies
A Thorsteinsson1, C Jonmarker, A Larsson
1Department of Anesthesia and Intensive Care, University Hospital, Lund, Sweden.
Insights
Functional residual capacity (FRC) increases with growth in children. This study found FRC correlates with height and weight, unaffected by cardiac anomalies or sex in pediatric patients.
Area of Science:
- Pediatric Pulmonology
- Anesthesiology
- Physiology
Background:
- Functional residual capacity (FRC) is a key respiratory parameter.
- Understanding FRC changes with growth is crucial for pediatric care.
Purpose of the Study:
- To assess the relationship between functional residual capacity (FRC) and growth in children.
- To determine if cardiac anomalies influence FRC-growth correlations.
Main Methods:
- FRC was measured using an automated tracer gas washout technique in anesthetized children.
- Two groups were studied: healthy children and those with cardiac malformations.
- Measurements were validated for accuracy and reproducibility.
Main Results:
- FRC showed significant correlation with height, weight, and age in both healthy children and those with cardiac anomalies.
- Regression analysis indicated that sex and cardiac anomalies did not significantly alter FRC-growth relationships.
- Specific linear and nonlinear regression equations were derived for FRC based on height and weight.
Conclusions:
- Functional residual capacity (FRC) in children is strongly dependent on physical growth parameters like height and weight.
- The presence of cardiac anomalies does not appear to significantly affect the relationship between FRC and growth.
- Established regression models can predict FRC based on height and weight in pediatric populations.
Abstract:
To assess the increase in functional residual capacity (FRC) with growth, FRC was measured after induction of anesthesia in two groups of children. One group consisted of 74 children, 0.1-11.2 yr of age, without signs of cardiorespiratory disease (referred to here as "normal" children), and the other of 21 children, 0.2-6.9 yr of age, with cardiac malformations. Anesthesia was maintained with halothane in the normal children and with fentanyl, droperidol, and nitrous oxide in the children with cardiac anomalies. All patients were paralyzed, their tracheas intubated, and their lungs mechanically ventilated. FRC was measured with an automated tracer gas washout technique. In 70 patients the measurements were performed in duplicate with a mean coefficient of variation of 2.0%. FRC correlated significantly with height, weight, and age in both groups. Multiple regression analysis for both groups considered together indicated no significant improvement when factors for the sex of the child or for the presence of cardiac anomalies were incorporated into the model. In normal children the simple linear and nonlinear regression equations for FRC (in milliliters) versus height (in centimeters) were: FRC = -529 + 9.48 x height, r = 0.96; and FRC = 0.00175 x height2.66, r = 0.97, respectively. The corresponding equations for FRC (in milliliters) versus weight (in kilograms) were: FRC = -92 + 29.9 x weight, r = 0.93; and FRC = 9.51 x weight1.31, r = 0.95.(ABSTRACT TRUNCATED AT 250 WORDS)