Pulmonary arterial hypertension (PAH) is a rare, progressive respiratory disease which causes dangerously high blood pressure and vascular resistance. This leads to progressive fatigue in the right ventricle which may even bring about heart failure.
The condition's main symptoms are breathlessness, dizziness and fatigue.
Pulmonary arterial hypertension is listed as a sub-category of pulmonary hypertension: in Italy, about 2,000 patients are estimated to have severe PAH.