Topics Discussed: body temperature regulation; fever; neonatal hypothermia; rewarming.
Excerpt:"The chance of survival of neonates is markedly enhanced by the successful prevention of excessive heat loss. For that purpose, the newborn infant must be kept under a neutral thermal environment. This is defined as the external temperature range within which metabolic rate and hence oxygen consumption are at a minimum while the infant maintains a normal body temperature (Figures 61 and 62 and Table 61). The normal skin temperature in the neonate is 36.036.5°C (96.897.7°F). Thenormal core (rectal) temperature is 36.537.5°C (97.799.5°F). Axillary temperature may be 0.51.0°C lower (95.998.6°F). A normal body temperature implies only a balance between heat production and heat loss and should not be interpreted as the equivalent of an optimal and minimal metabolic rate and oxygen consumption.Hypothermia and excessive heat loss. Preterm infants are predisposed to heat loss because they have a high ratio of surface area to body weight, little subcutaneous fat, and reduced glycogen and brown fat stores. In addition, their hypotonic ("frog") posture limits their ability to curl up to reduce the skin area exposed to the colder environment.
- Mechanisms of heat loss in the newborn include the following:
- Radiation. Radiation is heat loss from the infant (warm..."
The content above is only an
excerpt. For full access, log into an existing user account below, purchase an annual subscription, or
purchase a short-term subscription to the complete website.
offers pediatrics students,
educators, and practioners access to leading McGraw-Hill texts, interactive imaging
content, exclusive multimedia, and flexible curricular tools.
Timed access to all of AccessPediatrics
24 hours for $34.95
48 hours for $54.95