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In neonates, babies, children, teenagers, and young adults, pulmonary hypertension (PH) is a complex syndrome that can be accompanied by a number of cardiac, pulmonary, and systemic diseases that increase morbidity and mortality. Inflammation, pulmonary vascular remodelling, and angioobliteration are features of the underlying pulmonary hypertensive vascular disease (PHVD), which causes elevated pulmonary arterial pressure and resistance, right ventricular dysfunction, left ventricular compression, and ultimately heart failure. Recent developments in PH-targeted medicines and interventional surgical techniques have improved survival and quality of life in PH/PHVD patients.

A potentially fatal condition called pulmonary vascular obstructive disease is brought on by severe, persistent pulmonary hypertension. Recent discoveries in genetics and cell biology, however, give new insights into the pathophysiology of this illness, and novel treatments promise to increase survival and improve quality of life. It is essential to take a more proactive and aggressive approach to the management of pulmonary hypertension in young adults because the area is developing quickly. The evidence from several experimental investigations and the sustained clinical and hemodynamic improvement found in many adults with primary pulmonary hypertension treated with continuous prostacyclin suggest that the disease process may be stopped and possibly even reversed. Potential is probably larger in young people in whom the

The vasculature is still changing. Although most children are referred for treatment later in the course of the disease, pulmonary hypertension is usually not detected in infancy, highlighting the need to raise awareness of the condition. Young Adult Drug-Induced PAH in PH Obstructive pulmonary disease (COPD)

Obstructive sleep apnea is a breathing disorder during sleep.

PH with chronic thromboembolism Chronic high altitude exposure – PH Left ischemic heart disease chronic hypertension of the arteries persistent renal failure Myeloproliferative conditions Physiopathological occurrences

Hypoxia in the alveoli and respiratory acidosis Heart failure with a reduced ejection fraction or heart failure with a preserved ejection fraction is caused by RV hypertension.

PH in postcapillaries Pre- and postcapillary PH combined Children and young adults with PH The main causes of PH in adults are idiopathic, hereditary, drug-induced, and connective tissue disease-associated pulmonary arterial hypertension (PAH), whereas PH in children frequently occurs with congenital heart disease, with genetic syndromes, and as persistent PH in newborn and young infants. Interstitial lung disease, bronchopulmonary dysplasia, and developmental lung disease are also frequently linked to PH in children, whereas chronic obstructive pulmonary disease, sleep-disordered breathing, alveolar hypoxia, and carbon dioxide retention are the most common causes of PH in adults. Children rarely develop post-capillary PH from left heart disease, but adults with left ventricular diastolic insufficiency are increasingly identified with the condition. Pre-capillary PH, also known as PAH, is increasingly regarded as a systemic condition that affects the heart, lung, liver, kidney, skeletal muscle, and connective tissue, among other organ systems. Treatment

Recent years have seen a remarkable evolution in the treatment of PAH, which has resulted in the approval of 5 different classes of medications for adults, including prostacyclin analogues, endothelin receptor antagonists [ERAS], soluble guanylate cyclase stimulators, and prostacyclin receptor agonists, using 4 different delivery methods (oral, inhaled, subcutaneous, and intravenous). Patients’ symptomatic status significantly improved thanks to modern medication therapy, which also resulted in a reduced rate of clinical decline. But only a small number of these medications have been formally licenced for use in children since therapy techniques for adult PAH have not been properly investigated in young patients.

To improve screening, diagnostics (including genetic testing), established treatments, and therapy tailored to treat the underlying pathological processes in the child/young adult with PH, additional clinical and translational research is required. The RV and pulmonary arteries may both be equally relevant therapeutic targets, according to mounting evidence. Reactivation of foetal gene expression, induction of an epigenetic failure programme, dysregulation of the autonomic nervous system, abnormal mitochondrial metabolism with ineffective adenosine triphosphate production, and decreased coronary artery perfusion with potential for myocardial and microvascular injury are all examples of RV maladaptation.