Abstract
Introduction: Bioreactance, the analysis of intrabeat variations in response to high frequency transthoracic current, is a new method for noninvasive cardiac output measurement (NICOM). The objective of this study was to evaluate the cardiac index (CI) by bioreactance in children without hemodynamic alterations.
Methods: We performed a prospective, observational study in 10 patients with age range between 1 month to 12 years and weight from 4 to 30 Kg. The heart rate (HR), mean arterial pressure (MAP) and CI by bioreactance were analyzed every 6-8 hours.
Results: 34 measurements were made. The mean CI was 2.4 ± 1.03 ml/min/1.73 m2 (range 1 to 4.9 ml/min/1.73 m2). 52% of the measurements were lower than 2.5 L/min/1.73 m2. A significant correlation was found between CI and age (r = 0.50, p = 0.003), weight (r = 0.66, p < 0.001) and MAP (r = 0.369, p = 0.037). Significant differences were found when comparing CI in children whose weight was < 10 kg: 1.9 ± 0.73 ml/min/1.73 m2 (range 1 to 3.2 ml/min/1.73 m2), 10 and 20 kg: 2.07 ± 0.7 ml/min/1.73 m2 (range 1 to 3.6 ml/min/1.73 m2) and > 20 kg: 3.7 ± 0.8 ml/min/1.73 m2 (range 2.4 to 4.9 ml/min/1.73 m2) (p< 0.001).
Conclusion: In children CI values by bioreactance change with patient's age and weight. In a large percentage of measurements these might be lower than normal range. These data suggests that this method may not be useful to measure CI in small children.
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Diez, Y., Villaescusa, J., García, M. et al. 216 Cardiac Output Monitoring in Children by Bioreactance; a New Method for Noninvasive Cardiac Output Measurement. Pediatr Res 68 (Suppl 1), 113 (2010). https://doi.org/10.1203/00006450-201011001-00216
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DOI: https://doi.org/10.1203/00006450-201011001-00216