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paba
Forum Junior Topics: 15 Posts: 57 |
A 40 yr old man is admitted to hospital because of chronic cough and dyspnea.Pulmonary function tests and an arterial blood sample reveals following: End tidal air PO2 =95mmHg Vital capacity =1.5L below normal FRC =0.8L above normal RV =0.4L above normal PaO2 =72mmHg PaO2(breathing enriched O2) =95mmHg Which is the most likely cause of hypoxemia? A.Decreased pulmonary diffusion capacity B.Generalised hypoventilation C.Lt. to Rt.shunt D.Rt.to Lt.shunt E.very low V/Q ratio
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robin082006
| Forum Hero  Topics: 468 Posts: 5028
B, this patient has COPD
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paba
| Forum Junior Topics: 15 Posts: 57
Given Answer is A.
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robin082006
| Forum Hero Topics: 468 Posts: 5028
What is the minimum of A-a gradient that can be considered abnormal? Edited by robin082006 on Apr 23, 2006 - 8:14 AM
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ramo7
| Forum Senior Topics: 15 Posts: 126
answer is A
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cool_guyp4u
| Forum Senior  Topics: 12 Posts: 124
A and it is tough to make a definitive/ differential diagnosis with the info given. paba wrote: A 40 yr old man is admitted to hospital because of chronic cough and dyspnea.Pulmonary function tests and an arterial blood sample reveals following: End tidal air PO2 =95mmHg Vital capacity =1.5L below normal FRC =0.8L above normal RV =0.4L above normal PaO2 =72mmHg PaO2(breathing enriched O2) =95mmHg Which is the most likely cause of hypoxemia? A.Decreased pulmonary diffusion capacity B.Generalised hypoventilation C.Lt. to Rt.shunt D.Rt.to Lt.shunt E.very low V/Q ratio
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doc179
| Forum Guru Topics: 67 Posts: 1213
in physio the normal A-a gradient ranges from 5 - 10. But I think Goljan said in his audio that if the gradient is more than 30 it is considered abnormal. need to look it up somewhere else
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