A 55-year-old man, who has been on bed rest for the past 10 days, complains of breathlessness and chest pain. The chest X-ray is normal. The next step in investigation should he:
Ans. I.ung ventilation - perfusion scan
I.ung ventilation - perfusion scan
Pulmonary aeriography
Pulmonary venous wedge angiography
Echocardiography