<prompt> Pulmonary Hypeension is defined as Pulmonary Aery Pressure:15mm Hg18mmHg20mmHg25rrnnHg  <response>: Answer is D 25mmHg: PH has been defined as an increase in mean pulmonary aerial pressure PAP 25 mmHg at rest as assessed by right hea catheterization RHO. Definition Characteristics Clinical groups All Pulmonary hypeension PH Mean PAP 25 mmHg Pre-capillary PH Mean PAP 25 mmHg Pulmonary aerial hypeension PWP 15mmHg PH due to lung diseases CO normal or reduced Chronic thromboembolic PH PH with under andor multifactorial mechanisms Post-capillary PH Mean PAP 25 mmHg PH due to left hea disease PWP 15 mmHg CO normal or reduced Note: High CO can be present in cases of hyperkinetic conditions such as systemic to pulmonary shunts only in the pulmonary circulation, Anaemia. Hypehyroidism, etc. CO cardiac output; PAP pulmonary aerial pressure; PH pulmonary hypeension; PWP pulmonary wedge pressure; 