Baumgart S, Engle W D, Fox W W, Polin R A
Pediatr Res. 1981 Dec;15(12):1495-9. doi: 10.1203/00006450-198112000-00008.
Twelve critically ill neonates mechanically ventilated for respiratory failure (mean weight 1.33 kg, mean gestation 31 wk) were studied to quantitate the effects of radiant power from a radiant warming device, body weight, and body surface area on insensible water loss. Radiant power density (Mw/cm2) was measured using a wattmeter and thermopile transducer. Insensible water loss was measured using a Potter Baby Scale. Weight correlated inversely with insensible water loss, (r = -0.86, P less than 0.001). Radiant power density correlated inversely to weight, (r = -0.71, P less than 0.001). There was a significant increase in insensible water loss as radiant power density increased, (r = 0.54, P less than 0.05). Net radiant power received (W/kg) by infants over their exposed surface area, correlated directly to insensible water loss, (r = 0.67, P less than 0.01) irrespective of body weight. Critically ill neonates ventilated for respiratory failure and nursed under radiant warmers incurred greater insensible water losses than previously reported for well infants. The magnitude of this increased insensible water loss is inversely related to body size and is determined directly by the radiant power density required to maintain body temperature.
对12例因呼吸衰竭接受机械通气的危重新生儿（平均体重1.33千克，平均孕周31周）进行了研究，以定量分析辐射保暖设备的辐射功率、体重和体表面积对不显性失水量的影响。使用功率计和热电堆传感器测量辐射功率密度（毫瓦/平方厘米）。使用波特婴儿秤测量不显性失水量。体重与不显性失水量呈负相关（r = -0.86，P < 0.001）。辐射功率密度与体重呈负相关（r = -0.71，P < 0.001）。随着辐射功率密度增加，不显性失水量显著增加（r = 0.54，P < 0.05）。婴儿在其暴露表面积上接收的净辐射功率（瓦/千克）与不显性失水量直接相关（r = 0.67，P < 0.01），与体重无关。因呼吸衰竭接受通气并在辐射保暖器下护理的危重新生儿，其不显性失水量比之前报道的健康婴儿更大。这种增加的不显性失水量的幅度与身体大小呈负相关，并直接由维持体温所需的辐射功率密度决定。
