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Preterm birth is defined as a delivery that occurs at 20 weeks’ gestation or later but prior to 37 weeks’ gestation (from the first day of the last menstrual period). Although advancements in neonatology and obstetrical interventions have dramatically improved…
2.1 Physiologic changes during pregnancy Human pregnancy is characterized by profound anatomic and physiologic changes that affect virtually all systems and organs in the body. Many of these changes begin in early gestation. Understanding of the various physiologic adaptations in…