Pulmonary embolism (blood clots impacting in lung blood vessels) usually decreases

A. False  Vascular obstruction tends to increase pulmonary vascular resistance and cause pulmonary hypertension.

B. True  Due to the fall in pulmonary blood flow, atrial pressure tends to fall.

C. False  The obstruction tends to dam back blood in the right heart.

D. False  It rises since pulmonary capillary perfusion falls.

E. False  Blood that traverses pulmonary capillaries is adequately oxygenated; cyanosis in patients with pulmonary embolism is usually peripheral cyanosis due to low cardiac output.