Assessment of dry heat exchanges in newborns: influence of body position and clothing in SIDS

Elabbassi, Elmountacer Billah; Bach, Véronique; Makki, Malek; Delanaud, Stéphane; Telliez, Frédéric; Léké, A.; Libert, Jean‐Pierre

doi:10.1152/jappl.2001.91.1.51

Cited by 21 publications

(17 citation statements)

References 20 publications

(26 reference statements)

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“…Moreover, it has been shown that certain data obtained from the model are comparable to those measured in a newborn. [10][11][12] As expected, the total body heat loss decreases with increasing air temperature or added clothing elements. Insulating the head was shown to reduce the heat loss of the totally mannequin, especially for the nude mannequin ͑12.9%͒.…”

Section: Discussionsupporting

confidence: 70%

Head insulation and heat loss in naked and clothed newborns using a thermal mannequin

et al. 2002

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In newborns, large amounts of heat are lost from the head, due to its high skin surface area. Insulating the head (for example, with a hat or bonnet) can be a simple and effective method of reducing dry heat loss. In the present study, we evaluated the safety aspects of insulating the head of low-birth-weight naked or clothed newborns by using a heated mannequin that simulates a low-birth-weight newborn. Experimental conditions (comprising a nude and three clothed setups) were performed in a closed incubator at three different air temperatures (29 degrees C, 32 degrees C, and 34 degrees C) and with and without the head being covered with a bonnet in each case, i.e., 24 experimental conditions in all. The study shows that added clothing elements and insulating the head decreases the total heat loss of the mannequin as a whole. As regards the dry heat exchange from the head, wearing a bonnet decreases the local heat loss by an average of 18.9% in all clothed and thermal conditions. This phenomenon could be at the origin of brain overheating in heavily dressed newborns, when unrestricted heat loss is limited to the face only. Our results suggest that--apart from accidental hypothermia-in order to achieve thermal equilibrium of the body, it is preferable to leave the head unprotected and to increase the level of clothing insulation over the rest of the body.

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Section: Discussionsupporting

confidence: 70%

Head insulation and heat loss in naked and clothed newborns using a thermal mannequin

et al. 2002

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“…An original aspect of our study was the use of the baby doll model in the maternity ward and in home visits. The use of mannequins as a teaching resource is common in many areas of medicine (33,34), and in experimental studies related to SIDS (35,36). The doll models were specially manufactured for this study and had different “gender” and “race” features, providing an interesting and amusing element in the study.…”

Section: Discussionmentioning

confidence: 99%

Infant Sleep Position: A Randomized Clinical Trial of an Educational Intervention in the Maternity Ward in Porto Alegre, Brazil

Issler

Maróstica

Giugliani

2009

Birth

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“…As shown by Wheldon, 3 Sarman et al, 4 and Elabbassi et al, 5 a thermal mannequin can be a good tool for assessing thermal conditions and dry heat exchanges in neonatal care. With this device, instrumental errors are always lower than those expected from experiments on humans.…”

Section: B Mannequinmentioning

confidence: 93%

Assessment of whole body and regional evaporative heat loss coefficients in very premature infants using a thermal mannequin: Influence of air velocity

et al. 2005

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In human adults, experimental assessment of the evaporative heat loss coefficient (h(e)) requires a fully wetted skin surface area implying exposure to severe heat stress. For ethical reasons, this type of experimental situation is impossible to perform on neonates. The aim of the present study was to assess h(e) values in clinical situations for the body as a whole and for the different body segments, in particular, in natural and forced convection and using an anthropomorphic, sweating, thermal mannequin to represent a very small premature neonate (body mass 900 g). Skin hydration (i.e., simulated sweating) was performed by two electronic pumping systems, providing a steady adjustable flow of water to the mannequin surface. Experiments were carried out in a closed-incubator heated to air temperatures of 33 degrees C and 36 degrees C, with air velocities (Va) ranging from 0.01 to 0.7 m s(-1), and with four levels of air relative humidity (40, 50, 60, and 80%). For the body as a whole, h(e)=7 W m(-2) mb(-1) in natural convection, whereas in forced convection h(e) was 11.7, 12.4, and 14.1 W m(-2) mb(-1) for air velocities of 0.2, 0.4, and 0.7 m s(-1), respectively. As far as local h(e) is concerned, our results showed that the relative values of regional water loss in forced convection differ greatly from those observed under still air conditions. Thus, increasing air velocity enhances the heterogeneity in regional skin cooling, which may contribute to the neonate's thermal discomfort.

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Assessment of dry heat exchanges in newborns: influence of body position and clothing in SIDS

Cited by 21 publications

References 20 publications

Head insulation and heat loss in naked and clothed newborns using a thermal mannequin

Head insulation and heat loss in naked and clothed newborns using a thermal mannequin

Infant Sleep Position: A Randomized Clinical Trial of an Educational Intervention in the Maternity Ward in Porto Alegre, Brazil

Assessment of whole body and regional evaporative heat loss coefficients in very premature infants using a thermal mannequin: Influence of air velocity

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