Adaptation to extrauterine existence: cardiac and respiratory rates during the first 72 hours.
In 29 asymptomatic underweight newborns, 10 true preterms and 19 small-forgestational age (SGA), recordings of respiratory and cardiac rates were performed during the first 72 hours of life. The results may be summarized as follows: 1. Respiratory rates (RR) are slightly elevated during the first day of life. 2. The respiratory-to-cardiac ratio (RR/CR) is very constant throughout the first three days. 3. Low-Apgar infants initially have an elevated RR. 4. True preterm infants have higher cardiac rates (CR) than SGA infants. Not all of the phenomena observed can be totally explained on the basis of existing knowledge.
D000222:Adaptation, Physiological; D001034:Apgar Score; D006339:Heart Rate; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007234:Infant, Premature; D007236:Infant, Small for Gestational Age; D008991:Monitoring, Physiologic; D012119:Respiration