Persistent Pulmonary Hypertension of the Newborn (PPHN)

Persistent Pulmonary Hypertension of the Newborn (PPHN) is a serious condition affecting a newborn's lungs and heart. Normally, after birth, the blood vessels in the lungs open up to allow oxygen to enter the blood. In PPHN, these vessels remain narrow, causing high blood pressure in the lungs and making it hard for the baby to get enough oxygen. This leads to breathing difficulties and low oxygen levels in the body. The condition mainly affects the circulatory system and can cause symptoms like rapid breathing, bluish skin color, and poor feeding.

Persistent Pulmonary Hypertension of the Newborn (PPHN) is characterized by the failure of the normal decrease in pulmonary vascular resistance after birth, resulting in sustained high pressure in the pulmonary arteries. This causes right-to-left shunting of blood through fetal circulatory pathways such as the foramen ovale and ductus arteriosus, leading to severe hypoxemia. The core pathology involves abnormal vasoconstriction or remodeling of the pulmonary vasculature, often secondary to conditions like meconium aspiration syndrome, perinatal asphyxia, or congenital diaphragmatic hernia. PPHN is clinically significant because it causes severe respiratory distress and can lead to multiorgan dysfunction if untreated. It requires prompt recognition and management to improve oxygenation and reduce pulmonary artery pressure.