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Combined Effect of Radiant-Warmer Power and Phototherapy

William D. Engle, MD; Stephen Baumgart, MD; Jacob G. Schwartz, MS; William W. Fox, MD; Richard A. Polin, MD

Am J Dis Child. 1981;135(6):516-520.

Abstract
• 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 decrease 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/sq 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.

(Am J Dis Child 1981;135:516-520)

Author Affiliations
From the Division of Neonatology, Children's Hospital of Philadelphia, Department of Pediatrics, University of Pennsylvania School of Medicine.

Footnotes
Reprint requests to Division of Neonatology, Children's Hospital of Philadelphia, 34th Street and Civic Center Boulevard, Philadelphia, PA 19104 (Dr Polin).

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