You have just given your patient a 0.03 mg/ml dose of methacholine to assess for asthma. The subsequent forced vital capacity (FVC) shows no change. What should you do next?
a. Report to the physician that the patient does not have asthma.
b. Wait 1 hr and repeat the test at the same dose.
c. Have the patient return tomorrow to re-peat the test.
d. Double the dose and repeat the FVC ma-neuver.
ANS: D
If a positive response does not occur, the methacholine dosage is doubled to 0.06 mg/ml, and then the FVC maneuver is repeated.
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