what is arterial hypertension
Pulmonary arterial hypertension (PAH) is a rare form of high blood pressure. It occurs in the pulmonary arteries that flow from your heart and through your lungs.Constricted and narrowed arteries prevent your heart from pumping adequate blood.When constriction occurs, the heart will need to work harder to compensate.his causes the blood pressure in the pulmonary arteries and in the heart to increase dramatically. As the condition worsens and the pressure becomes greater, you may begin experiencing a variety of signs and symptoms.