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Background  Very low birth weight (VLBW) infant thermal instability upon neonatal intensive care unit admission has been associated with respiratory morbidity; however, the association between ongoing thermal instability and respiratory morbidity remains unclear.    Methods  A longitudinal data analysis was conducted on 12 VLBW infants. Chronic respiratory morbidity risk was defined as supplemental oxygen requirement (FiO 2 ) or scheduled diuretic dosing at 36 weeks post-menstrual age. Acute respiratory morbidity was quantified as desaturations (SpO 2 <90%), bradycardia with desaturations (HR<100 and SpO 2 <90%), apnea, increase in FiO 2  requirement, or increase in respiratory support. Multi-level, mixed-effects models and regression analysis examined the relationships between body temperature over the first 14 days of life and respiratory morbidities.    Results  Body temperature was not associated with chronic respiratory morbidity risk ( p= 0.2765). Desaturations, bradycardia with desaturations, increased FiO 2  requirement, and increased respiratory support were associated with decreased body temperature ( p< 0.05). Apnea was associated with increased body temperature ( p <0.05). The covariate-adjusted risk of desaturations ( aOR =1.3), bradycardia with desaturations ( aOR =2.2), increase in FiO 2  requirement  (aOR =1.2), and increase in respiratory support ( aOR= 1.2) were significantly greater during episodes of hypothermia.    Conclusion  VLBW infants are dependent on a neutral thermal environment for optimal growth and development. Therefore, the significant associations between hypothermia and symptoms of acute respiratory morbidity require further study to delineate if these are causal relationships that could be attenuated with clinical practice changes, or if these are concurrent symptoms that cluster during episodes of physiological instability.

Body temperature instability and respiratory morbidity in the very low birth weight infant: a multiple case, intensive longitudinal study