title: Noninvasive cerebral oximeter as a surrogate for mixed venous saturation in children.
abstract: We evaluated the relationship between regional cerebral oxygen saturation (rSO(2)) measured by near-infrared spectroscopy (NIRS) cerebral oximeter with superior vena cava (SVC), inferior vena cava (IVC), right atrium (RA), and pulmonary artery (PA) saturation measured on room air and 100% inspired oxygen administered via a non-rebreather mask (NRB) in children. Twenty nine pediatric post-orthotopic heart transplant patients undergoing an annual myocardial biopsy were studied. We found a statistically significant correlation between rSO(2) and SVC saturations at room air and 100% inspired oxygen concentration via NRB (r = 0.67, p = 0.0002 on room air; r = 0.44, p = 0.02 on NRB), RA saturation (r = 0.56, p = 0.002; r = 0.56, p = 0.002), and PA saturation (r = 0.67, p < 0.001; r = 0.4, p = 0.03). A significant correlation also existed between rSO(2) and measured cardiac index (r = 0.45, p = 0.01) and hemoglobin levels (r = 0.41, p = 0.02). The concordance correlations were fair to moderate. Bias and precision of rSO(2) compared to PA saturations on room air were -0.8 and 13.9%, and they were 2.1 and 15.6% on NRB. A stepwise linear regression analysis showed that rSO(2) saturations were the best predictor of PA saturations on both room air (p = 0.0001) and NRB (p = 0.012). In children with biventricular anatomy, rSO(2) readings do correlate with mixed venous saturation.
authors.affiliation: Department of Pediatrics, University of Arkansas for Medical Sciences and Arkansas Children's Hospital, Little Rock, AR 72202, USA. bhuttaadnant@uams.edu
authors.forename: Adnan T
authors.initials: AT
authors.lastname: Bhutta
authors.forename: Jesse W
authors.initials: JW
authors.lastname: Ford
authors.forename: James G
authors.initials: JG
authors.lastname: Parker
authors.forename: Parthak
authors.initials: P
authors.lastname: Prodhan
authors.forename: Eudice E
authors.initials: EE
authors.lastname: Fontenot
authors.forename: Paul M
authors.initials: PM
authors.lastname: Seib
authors.forename: Brittany I
authors.initials: BI
authors.lastname: Stroope
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Frazier
authors.forename: Michael L
authors.initials: ML
authors.lastname: Schmitz
authors.forename: Jonathan J
authors.initials: JJ
authors.lastname: Drummond-Webb
authors.forename: William R
authors.initials: WR
authors.lastname: Morrow
mesh_terms: D000293:Adolescent; D000367:Age Factors; D006328:Cardiac Catheterization; D002540:Cerebral Cortex / Q000098:blood supply*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D016027:Heart Transplantation; D006801:Humans; D007223:Infant; D008297:Male; D010092:Oximetry; D010101:Oxygen Consumption; D011184:Postoperative Period; D019265:Spectroscopy, Near-Infrared; D013997:Time Factors