Increase blood flow to lungs cause
Other causes include obstructive sleep apnea, congenital hea disease, chronic hypoxemia, pulmonary thrombosis (blood clots), or left ventricular failure. ... Hemodynamically, PAH can be caused by increased right ventricular output, increased pulmonary systemic vascular resistance, or increased pulmonary venous pressure Ref: guyton and hall textbook of medical physiology 12 edition page number:311,312,313
No change in pulmonary vascular resistance
Increased pulmonary vascular resistance
Decreases pulmonary vascular resistance
Initial increase followed by decrease in pulmonary vascular resistance
Respiratory system