Adaptation of respiration in newborns.

1. Big picture

Adaptation of respiration in newborns means the transition from fetal life, where the placenta performs gas exchange and the fetal lungs are fluid-filled, to extrauterine life, where the newborn must establish air breathing, lung aeration, functional residual capacity, oxygenation, and effective gas exchange within minutes.

The examiner wants this core sequence:

Birth → cord clamping + first breaths
→ lung fluid is cleared
→ lungs expand
→ functional residual capacity is created
→ pulmonary vascular resistance falls
→ pulmonary blood flow increases
→ oxygenation rises

The most important clinical point:

The first priority in neonatal transition is effective ventilation, because oxygenation and circulatory adaptation depend on lung aeration.

If respiratory adaptation fails, the newborn may develop:

• apnea
• persistent cyanosis
• respiratory distress
• hypoxemia
• acidosis
• pulmonary hypertension
• need for neonatal resuscitation

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