Improvements in Infant Sleep Position: We Can Do Better!

Implementation of Safe Sleep Practices by Mothers with 0-1 Year-Old Infants

Aim: The sleep environment of an infant affects the likelihood of sudden infant death syndrome and other sleep-related infant deaths. This study was performed to determine the safe sleep practices of mothers with 0–1 year-old infants. Methods: This descriptive study included 204 mothers with 0–1 year-old infants who visited family health centers between October 30 and December 28, 2018. The data were collected using a questionnaire form and evaluated using the number, percentage, mean, standard deviation, and chi-squared test. Results: The mean age of the mothers was 28.48 ±5.83 years; 43.1% were primary school graduates and 84.8% were housewives; 53.9% of the infants were girls and 39.2% were 0–3 months old. It was found that 47.5% of the mothers put their infant to sleep in the supine position, 46.1% in the non-supine position, 70.1% on a soft bed, and 76.5% by using a pillow. In addition, 41.2% of the mothers stated that they used pacifiers while putting their infant to sleep, 9.8% stated that they slept in the same bed with their infant, and 92.9% stated that they slept in the same room. Conclusion: It was determined that the mothers performed certain risky practices related to the sleep environment, particularly regarding soft beds’ use, sleeping positions, pillow use, and bed-sharing. It may be recommended that healthcare professionals play an active role and take responsibility in increasing the level of knowledge and awareness of parents regarding safe sleep. Keywords: sleep, infant, mothers, family practice

Aerodynamic factors affecting rebreathing in infants

The rebreathing of expire air, with high carbon dioxide and low oxygen concentrations, has long been implicated in unexplained Sudden Infant Death Syndrome (SIDS) when infants are placed to sleep in a prone (facedown) position. This study elucidates the effect of the aerodynamic parameters Reynolds number, Strouhal number, and Froude number on the percentage of expired air that is reinspired (rebreathed). A nasal module was designed that served as a simplified geometric representation of infant nostrils and placed above a hard, flat surface. Quantitative and flow visualization experiments were performed to measure rebreathing, using water as the working medium, under conditions of dynamic similarity. Different anatomic (e.g., tidal volume, nostril diameter), physiological (e.g., breathing frequency), and environmental (e.g., temperature, distance from the surface) factors were considered. Increases in Strouhal number (simultaneously faster and shallower breathing) always produced higher rebreathed percentages, because rolled-up vortices in the vicinity of the nostrils had less time to move away by self-induction. Positively and negatively buoyant flows resulted in significant rebreathing. In the latter case, consistent with a warm environment and a high percentage of rebreathed CO₂, denser gas pooled in the vicinity of the nostrils. Reynolds numbers below 200 also dramatically increased rebreathing because the expired gas pooled much closer to the nostrils. These results clearly elucidated how the prone position dramatically increases rebreathing by a number of different mechanisms. Furthermore, the results offer plausible explanations of why a high-temperature environment and low birthweight are SIDS risk factors. NEW & NOTEWORTHY A fundamentally new aerodynamics-based approach to the study of rebreathing of expired air in infants is presented. Rebreathing is implicated in unexplained Sudden Infant Death Syndrome (SIDS) when infants sleep in a prone position. This is the first time that aerodynamic parameters are systematically varied and their effects on rebreathing quantified. The study provides us with a deeper understanding of the effects of breathing frequency, tidal volume (birthweight) and environmental conditions.