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:: (A) I.ung ventilation - perfusion scan, (B) Pulmonary aeriography, (C) Pulmonary venous wedge angiography, (D) Echocardiography
Answer is A. Ans. I.ung ventilation - perfusion scan