USMLE Forum Archives - USMLE Step 2 CK - acid base balance
acid base balance
HIV - 01-09-08 20:29
A 54-year-old woman with a long history of emphysema presents because of an exacerbation of her cough and dyspnea. On physical examination, her blood pressure is 126/64 mm Hg, pulse is 82/min, and respirations are 24/min. On lung examination, there are loud expiratory wheezes and rhonchi. The cardiac examination is normal. An arterial blood gas is performed. Which of the following results would most likely be expected?
A. pH of 7.20, pCO2 of 60, and pO2 of 46
B. pH of 7.30, pCO2 of 50, and pO2 of 94
C. pH of 7.35, pCO2 of 45, and pO2 of 60
D. pH of 7.46, pCO2 of 25, and pO2 of 76
E. pH of 7.52, pCO2 of 30, and pO2 of 82
HIV - 01-09-08 20:29
A 54-year-old woman with a long history of emphysema presents because of an exacerbation of her cough and dyspnea. On physical examination, her blood pressure is 126/64 mm Hg, pulse is 82/min, and respirations are 24/min. On lung examination, there are loud expiratory wheezes and rhonchi. The cardiac examination is normal. An arterial blood gas is performed. Which of the following results would most likely be expected?
A. pH of 7.20, pCO2 of 60, and pO2 of 46
B. pH of 7.30, pCO2 of 50, and pO2 of 94
C. pH of 7.35, pCO2 of 45, and pO2 of 60
D. pH of 7.46, pCO2 of 25, and pO2 of 76
E. pH of 7.52, pCO2 of 30, and pO2 of 82
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#3
Re: acid base balance 8401glacieres - 01-11-08 03:13 A-----is the answer.
Since she has long standing emphysema she will be having chronic respiratiry acidosis compensated by renal mechanisms, but however we r not given his value of HCO3, which would have helped in comming to a diagnosis easily, it is better t pick up option A.
#4
Re: acid base balance radhamesramos - 01-29-08 13:33 yes, we needed the Bicarb. But good question though
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