Early Pulmonary Hypertension in Preterm Infants

Area of Science:

• Neonatology
• Pediatric Cardiology
• Respiratory Medicine

Background:

• Pulmonary hypertension (PH) in preterm neonates presents unique multifactorial pathogenesis.
• Premature lungs are susceptible to injury from ventilation and oxygen, leading to diverse PH phenotypes.
• Early PH prevalence varies significantly, affecting 8-55% of extremely preterm infants.

Purpose of the Study:

• To review the characteristics and pathogenesis of PH in preterm neonates.
• To discuss the variable prevalence and contributing factors of early PH.
• To highlight the controversies surrounding the management of PH and vasodilator use in this population.

Main Methods:

• Literature review of studies on neonatal pulmonary hypertension.
• Analysis of factors contributing to lung injury and vascular dysfunction in preterm infants.
• Synthesis of current evidence on PH management strategies.

Main Results:

• Preterm infants experience lung injury from positive pressure ventilation and high oxygen concentrations.
• Disrupted lung development and vascular signaling pathways contribute to abnormal pulmonary vascular transition.
• The prevalence of PH in extremely preterm infants is highly variable.

Conclusions:

• PH in preterm neonates is characterized by multifactorial causes and unique presentations.
• Abnormal pulmonary vascular transition is linked to disrupted lung development and signaling.
• Current management approaches for early PH, including off-label vasodilator use, require further investigation and consensus.