Which of the following measures during cardiopulmonary exercise evaluation are most useful in differentiating between exercise intolerance of cardiac versus ventilatory origin?
1. Maximum heart rate
2. O2max
3. PaCO2
4. PaO2
a. 2 and 4 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: C
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