The relationship between bedding and face-down death in infancy: mathematical analysis of a respiratory simulation system using an infant mannequin to assess gas diffusibility in bedding

Forensic Science International : Synergy
Jun SakaiJun Kanetake

Abstract

Rebreathing is a model for the relationship between a prone sleeping position and sudden infant death syndrome. This study used a mechanical simulation model to establish the relationship between types of bedding and rebreathing potential for an infant placed prone (face down) at different postnatal ages. The infant mannequin was connected to a respirator set to deliver physiologically appropriate combinations of tidal volume (V(T)) and respiratory rates (RR) across a range of postnatal ages (0-18 months). Before measurements were made, CO(2) flow was regulated to 5+/-0.1% of end-tidal PCO(2) (EtCO(2)). After the model was placed in a prone position, any increase in the fractional concentration of inspired CO(2) (FiCO(2)) was measured. FiCO(2) increased immediately and rapidly, and reached a maximum value within a few minutes. The maximum FiCO(2) ranged from under 2% to over 10%, depending on the bedding. FiCO(2) was also affected by V(T) and RR. This model is not applicable to actual infants because of the large tissue stores of CO(2) in infants; however, it is useful for evaluation of gas diffusibility of bedding and will simplify the investigation of sleeping environments when a baby is found dead with its face covered by so...Continue Reading

References

Dec 1, 1991·Journal of Paediatrics and Child Health·B J Taylor
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Apr 1, 1985·Pediatric Research·C S IrvingP D Klein
Aug 1, 1993·Archives of Disease in Childhood·D P BoltonC Cresswell
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Aug 26, 1998·The Tohoku Journal of Experimental Medicine·M FunayamaR Nozawa
Jun 28, 2003·Pediatrics International : Official Journal of the Japan Pediatric Society·Jun KanetakeMasato Funayama

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