Abstract 10147: Normal Values of Regional Oxygen Saturation Index (rSO2) in Children Using Near Infra-Red Spectroscopy (NIRS) Vary With Age.
Introduction: Near infra-red spectroscopy (NIRS) monitoring of cerebral, splanchnic and renal ′regional oxygen saturation index′ (rSO2) after heart surgery in children is increasing in intensive care setting. rSO2 values are used to monitor trend during critical illness because normal values of rSO2 index are not established or calibrated in currently available equipment. We hypothesize that normal values of rSO2 will remain similar regardless of age and size of the patient since they reflect cardiac index.
Methods: 168 children with and without heart disease were studied during their outpatient visit to a tertiary care cardiac center. rSO2 index for cerebral, splanchnic and renal regions were measured. Age, body size, vital signs, pulse oximetry, diagnosis, EKG and echocardiogram reports were reviewed. Normal cardiac output is presumed. Normal values are reported.
Results: 101 children had no heart disease. 67 children had heart disesae. 11 children with cyanosis (pulse oximetry <94%) were excluded. Normal values are reported as mean and standard deviation (SD). For the whole group, cerebral rSO2 index was 68.7 (SD 7.6), splanchnic rSO2 index was 70.7 (SD 11.5) and renal rSO2 index was 70.8 (11.5). Table provides normal rSO2 index values for infants (< 1 yr age) and children (> 1 yr age). Cerebral and splanchnic rSO2 indices were significantly lower in infants compared to children (p < 0.001). Renal rSO2 index was not significantly different between infants and children (p = 0.17)
Conclusions: Normal values of rSO2 index vary with age. Infants have lower rSO2 reading than children > 1 yr. These differences may reflect age-related changes in regional perfusion. Further studies are needed to understand the factors causing the variation in rSO2 index in children.
- © 2010 by American Heart Association, Inc.