Normal PCWP with pulmonary oedema is seen in: (A) Left atrial myxoma, (B) High altitude, (C) Pulmonary vein obstruction, (D) Pulmonary aery obstruction
Answer is B. Ref Harrison 19 th ed pg 1763 The use of a Swan-Ganz catheter permits measurement of PCWP and helps differentiate high-pressure (cardiogenic) from normal- pressure (noncardiogenic) causes of pulmonary edema. High altitude has been grouped together as one of the miscellaneous causes for ARDS reflecting pulmonary oedema with a normal PCWP