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A lean 55 year-old mechanic weighing 85kg has chronic shortness of breath during...
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A lean 55 year-old mechanic weighing 85kg has chronic shortness of breath during moderate exercise. On spirometry his vital capacity is 3.2L and his FEV1/FVC ratio is 78%. His arterial PO2 is 98mmHg at rest. He is most likely suffering from
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