Pulmonary Hypertension in Infants Who Are Premature

Area of Science:

• Neonatology
• Pediatric Cardiology
• Respiratory Medicine

Background:

• Pulmonary hypertension (PH) in neonates is a critical condition often linked to the transition from fetal to postnatal circulation.
• PH in preterm infants involves diverse pathophysiologic mechanisms, categorized into precapillary, postcapillary, and flow-driven phenotypes.
• Traditional treatments like inhaled nitric oxide have variable efficacy depending on the specific PH phenotype and cause.

Purpose of the Study:

• To review the current understanding of PH in premature infants.
• To propose a framework for diagnosing and phenotyping PH in this population.
• To guide individualized management strategies based on physiological understanding.

Main Methods:

• Narrative review of existing literature on neonatal pulmonary hypertension.
• Analysis of pathophysiologic mechanisms and hemodynamic features of different PH phenotypes.
• Synthesis of diagnostic and therapeutic approaches for preterm infants with PH.

Main Results:

• PH in preterm infants presents a spectrum of phenotypes with distinct clinical and hemodynamic characteristics.
• Efficacy of pulmonary vasodilators is phenotype-dependent, necessitating tailored therapeutic approaches.
• A physiologically grounded framework can aid in diagnosis and phenotyping.

Conclusions:

• Accurate phenotyping of pulmonary hypertension in preterm infants is crucial for optimizing treatment.
• Individualized management strategies informed by physiological understanding are essential.
• Further research into phenotype-specific therapies for neonatal PH is warranted.