title: [A period of urgent postnatal adaptation as a critical stage of human ontogenesis].
abstract: The infant's state immediately after delivery is characterized by critical shifts of homeostasis parameters: decompensated mixed acidosis, pathologic indices of gaseous blood condition (arterial hypoxemia and hypercapnia), spontaneous postnatal hypothermia. Qualitative change of functional systems after delivery is accompanied by expressed tense of adaptation and regulation mechanisms and by centralization of cardiac rhythm control. The use of mathematical analysis of cardiac rhythm made it possible to find out that the change of degree of adaptation tense in the process- of postnatal period obeys the exponential dependence; moreover, the duration of transitional process of healthy newborns is 1 hour, but it considerably increases in case of hypoxia. After comparison of cardiac rhythm indices of these two groups of newborns it has been pointed out that mechanisms of adaptation after delivery are equal and they are based on the growing activity of central regulation processes. The dynamics of transitional process such as the period of postnatal adaptation indicates the reserve possibilities of infant and helps to reveal pre-nosological forms of disadaptational syndrome.
mesh_terms: D000222:Adaptation, Physiological; D001831:Body Temperature; D002245:Carbon Dioxide / Q000097:blood; D005260:Female; D005318:Fetal Heart / Q000502:physiology; D006339:Heart Rate; D006801:Humans; D007231:Infant, Newborn; D010100:Oxygen / Q000097:blood; D011247:Pregnancy; D012119:Respiration
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen
vernacular_title: Period ékstrennoĭ postnatal'noĭ adaptatsii kak kriticheskiĭ étap ontogeneza cheloveka.