HESI OB EXAM STUDY GUIDE NEWBORN.

HESI OB EXAM STUDY GUIDE NEWBORN.Respiratory transition in the newborn Respiratory function • Established when cord is cut. • Air inflates lungs with first breath. • 4 factors influence the initiation of the 1st breath Chemical factors: hypercarbia, acidosis, and hypoxia which stimulate the resp center in the brain to initiate breathing. Sensory factors stimulate the first breath. Thermal factors are involved when the neonate exits the warm environment they have been used to. Mechanical factors such as removal of fluid from the lungs and replacements of air is the primary mechanical factor. • The fetal chest compression that occurs during a vaginal birth increases the intrathoracic pressure and helps push fluid out of the lungs. Circulatory transition in the newborn • Successful adaptation in the neonate involves five major changes and increased aortic pressure • Decreased venous pressure and increased systemic pressure • Decreased pulmonary pressure