Exam 19: Pulmonary Function Testing

During a helium (He) dilution functional residual capacity (FRC) measurement, the technologist first bleeds in 500 ml of He (He Vol) and obtains an initial reading of 4.0% (FiHe). After equilibration, the second He reading is 3.2% (FfHe). What is the patient's FRC?

What causes the residual volume (RV) and functional residual capacity (FRC) to increase?

To what should all spirometric values obtained under ambient conditions be converted?

What is the American Thoracic Society standard for volumetric accuracy of spirometers?

What is the predicted normal tidal volume in the adult patient?

Which of the following statements is TRUE when comparing the pulmonary function test results of men versus women?

Which of the following is typically elevated in restrictive lung disease?

What do we measure to determine the precision of an instrument?

Which of the following is equal to total lung capacity (TLC)?

Toward the end of a nitrogen washout test for functional residual capacity, the expired concentration of N₂ begins rising. What does this probably indicate?

A patient has a decreased DLCO but a normal DLCO/V_A ratio. The patient most likely has

Which of the following statements is TRUE about inspiratory capacity (IC)? I. It is reduced in restrictive lung diseases. II. It may be reduced in obstructive lung diseases. III. It may help determine the type of lung expansion therapy to apply.

What conclusions can you draw from the following data, obtained on a 32-year-old 53-kg woman admitted for elective surgery? ACTUAL PRED \% PRED ACTUAL PRED \% PRED TLC 4.93 5.27 94\% FVC 3.67 3.86 95\% FRC 2.41 2.43 99\% \% 84\% 78\% RV 1.29 1.35 96\% 5.66 5.74 99\% VC 3.64 3.86 94\% 3.53 3.49 101\%

You perform a series of pulmonary function tests on a patient with a potentially infectious disease carried via the airborne route. Which of the following infection-control procedures should you implement? I. Wear a respirator or close-fitting surgical mask. II. Dispose of, sterilize, or disinfect the tubing circuit after testing. III. Clean the interior surface of the spirometer before the next test.

What is the predicted normal for the peak expiratory flow (PEF) in the average man?

Tests of pulmonary mechanics include all of the following except:

What is the normal predicted total lung capacity (TLC) for adults?

Which of the following are indications for assessing pulmonary function? I.screen for pulmonary disease II.evaluate patients for surgical risk III.assess the progression of disease IV.assist in determining pulmonary disability V.modify the therapeutic approach to patient care

In which of the following conditions is total lung capacity (TLC) always reduced?

All of the following pulmonary function devices directly collect and measure gas volumes except: