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A 60 year old frail male who had been hospitalised for 2 weeks develops onset of acute breathlessness and haemoptysis.His EKG shows Q wave and T inversion in lead III and prominent S wave in lead I.Atrial blood gasshowed PaO2 66 mm Hg, PaCO2 30 mm Hg and pH 7.42.The most useful investigation in his case would be -
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