Fluid Restriction in Transient Tachypnea of the Newborn: A Systematic Review of Recent Evidence and Clinical Outcomes

Abstract

Transient Tachypnea of the Newborn (TTN) is a common self-limiting respiratory condition observed in neonates, particularly in late preterm and term infants. It is characterized by delayed clearance of fetal lung fluid, leading to respiratory distress shortly after birth.

 The condition poses a diagnostic challenge, as it must often be differentiated from other neonatal respiratory disorders, such as respiratory distress syndrome (RDS), meconium aspiration syndrome (MAS), and pneumonia(1).

The pathophysiology of TTN revolves around the impaired resorption of fetal lung fluid, which is normally cleared through active sodium transport mechanisms in the alveolar epithelium and lymphatic drainage during labour and early postnatal life(2). Cesarean deliveries, especially without labour, bypass the physiological mechanisms that facilitate fluid clearance, leading to fluid retention in the alveoli and subsequent respiratory distress(3). Additionally, factors such as immature sodium transport channels and altered pulmonary vascular resistance may further contribute to the delayed fluid clearance observed in TTN(4).

Fluid management plays a critical role in the management of TTN. Excessive fluid administration may exacerbate pulmonary edema and prolong respiratory distress by impeding the resorption of lung fluid. Consequently, fluid restriction has emerged as a potential strategy to optimize outcomes in neonates with TTN.