You have just given your patient a 0.03 mg/ml dose of ...

[wrbasek0]

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.

Question 2

After a resting expiration, air still remains in the lungs. What is this volume called?
 
  a. Functional residual capacity (FRC)
  b. Vital capacity (VC)
  c. Residual volume (RV)
  d. Expiratory reserve volume (ERV)

[ryansturges]

Answer to Question 1

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.

Answer to Question 2

ANS: A
The four lung capacities are TLC, inspiratory capacity (IC), FRC, and the VC. These volumes and capacities are shown in Figure 20-10. The lung volumes that can be measured directly with a spirometer or pneumotachometer include VT, IC, IRV, ERV, and VC.