%0 Journal Article %A Suzanne S Summer %A Jesse M Pratt %A Elizabeth A Koch %A Jeffrey B Anderson %T Testing a novel method for measuring sleeping metabolic rate in neonates %D 2013 %R 10.4187/respcare.02636 %J Respiratory Care %P respcare.02636 %X Introduction: Sleeping Metabolic Rate (SMR) is used as a proxy for Basal Metabolic Rate in infants, when measurement while awake is not practical. Measuring SMR via indirect calorimetry (IC) can be useful for assessing feeding adequacy especially in compromised neonates. Standard IC equipment, including the hood placed over the head, is not designed for the smallest of patients. Our aim was to determine whether a smaller, non-standard hood measures SMR in neonates similarly compared to a standard large hood. Methods: SMR was measured in healthy neonates (controls) and those born with single ventricle congenital heart disease (cases). Two measurements were performed: SMR using a standard large hood (LH) and SMR using a smaller hood (SH). Time to steady state, minute ventilation (VE), and expired carbon dioxide (FECO2) – an indicator of data quality – were also measured. Primary outcome was SMR using both hoods. Results are stated as Median (IQR). Spearman correlations measured association between SH and LH. Results: We studied nine controls and seven cases. SMR in controls was not different between SH and LH [35.7 (15.14) vs. 37.8 (7.41) kcals/kg/day, respectively]. In cases, SH was significantly greater than LH [45.5 (4.63) vs. 34.2 (8) kcals/kg/day, p<0.02]. FECO2 was significantly higher in SH versus LH in both groups, and VE was significantly lower in SH versus LH in controls only. SMR values for SH and LH were significantly correlated in the control group (r = 0.80, p < 0.01). Time to steady state was similar in both groups regardless of hood size. Conclusions: SMR measured with a small hood yields results similar to those measured with a standard large hood in healthy neonates without affecting testing time or other aspects of the IC procedure. Furthermore,resultsin compromised infants suggest that a smaller hood may facilitate SMR testing in this population. %U https://rc.rcjournal.com/content/respcare/early/2013/11/19/respcare.02636.full.pdf