Blood Gases and Related Tests
The patient is a 64-year-old female being evaluated for a liver transplant. She has a long history of liver disease and recently began to complain of increased shortness of breath. The shortness of breath seems to subside when she lies down. She has a smoking history of 55 pack-years. Spirometry revealed an FEV1 of 1.23 L, consistent with a moderate obstructive ventilatory defect. She was referred for supine and upright shunt evaluation by the transplant surgeon.
PULMONARY FUNCTION TESTING
|Fio2||0.989||a – ao2||243|
Actual C(a – )o2 used for shunt calculation.
- Interpret the sitting and supine shunt values.
- What is the cause of the patient’s symptoms?
- What other tests might be indicated?
- On the basis of these findings, what treatment might be recommended?
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