Definition of cause for English Language Learners. : 1  something or someone that produces an effect, result, or condition : something or someone that makes something happen or exist. : 2  a reason for doing or feeling something. : 3  something (such as an organization, belief, idea, or goal) that a group or people support or fight for.
Though PH patients have 68% probability of surviving after the first year of diagnosis, and the chances decrease to 34% four years later, according Ohio State University Lung Center, early diagnosis is critical in increasing the pulmonary hypertension life expectancy.
Definition and Causes. Pulmonary hypertension is a hemodynamic state defined by a resting mean pulmonary artery pressure at or above 25 mm Hg. Because this definition is based on hemodynamic criteria, pulmonary hypertension can be the result of a variety of diseases of different causes. Pulmonary arterial hypertension (PAH), however, should be distinctly differentiated from pulmonary venous hypertension resulting from left heart disease.