Environment is everything that is around. It can be living or non-living things. It includes physical, chemical and other natural forces. Living things live in their environment. They constantly interact with it and change in response to conditions in their environment.
Cleveland_Clinic_Host: Pulmonary hypertension is a rare and serious lung disorder. It occurs in individuals of all ages, races, and ethnic backgrounds -- although it is more common in young adults and is approximately twice as common in women as in men.
Persistent pulmonary hypertension of the newborn (PPHN), occasionally referred to as persistent fetal circulation, results when there is severe vasoconstriction of the pulmonary vasculature resulting in elevation of pulmonary arterial pressure and right ventricular pressure.