If wheezing and rhonchii

-          Bronchial Asthma

If edema of legs, palpable liver, murmur or prominent neck veins.

-          C.C.F

If sudden breathless in an apaarently healthy middle aged man.

-          Acute myocardial infarct with L.V.F

If Emphysemotous chest, poor air blast.

-          Emphysema (C.O.P.D) with superadded infection of spontaneous pneumothorax.

Sudden breathlessness in a healthy man, with fine crepitations and no rhonchii, should make you suspect myocardial infarct. Ask for ECG.