Engle W D, Baumgart S, Schwartz J G, Fox W W, Polin R A
Am J Dis Child. 1981 Jun;135(6):516-20. doi: 10.1001/archpedi.1981.02130300016007.
To quantitate radiant power and insensible water loss under phototherapy, 12 neonates were studied under radiant warmers for one hour each with and without phototherapy. Warmer power was measured by wattmeter and thermopile. Power density received from phototherapy was 4.4 mW/sq cm. Addition of phototherapy to the servocontrolled warmer caused a disease in power density received from the warmer (17.1 to 12.9 mW/sq cm). However, the total radiant-power density received with phototherapy and the warmer combined (17.3 mW/sg cm) did not differ from net power density received without phototherapy (17.1 mW/sq cm). Insensible water loss, measured with a metabolic balance, increased from 2.54 to 3.73 mL/kg/hr, with addition of phototherapy. Since the total radiant-power density did not change, mechanisms other than increased radiant-power delivery must exist to explain the increased insensible water loss observed with phototherapy.
为了定量光疗下的辐射功率和不显性失水，对12例新生儿在辐射保暖器下分别进行了有光疗和无光疗各1小时的研究。保暖器功率通过瓦特计和热电堆测量。光疗的功率密度为4.4毫瓦/平方厘米。在伺服控制的保暖器上增加光疗导致从保暖器接收的功率密度下降（从17.1降至12.9毫瓦/平方厘米）。然而，光疗和保暖器联合接收的总辐射功率密度（17.3毫瓦/平方厘米）与无光疗时接收的净功率密度（17.1毫瓦/平方厘米）并无差异。通过代谢平衡测量，增加光疗后，不显性失水从2.54增加到3.73毫升/千克/小时。由于总辐射功率密度没有变化，必然存在除辐射功率增加之外的其他机制来解释光疗时观察到的不显性失水增加。
