Which of the following statements is true about inspiratory capacity (IC)?
1. It is reduced in restrictive lung diseases.
2. It may be reduced in obstructive lung diseases.
3. It may help determine the type of lung expansion therapy to apply.
A)1 and 3 only
B)2 and 3 only
C)1 and 2 only
D)2 only

Question

Quizplus · Accepted Answer

The IC may be normal or reduced in restrictive and obstructive lung diseases. A reduction of IC occurs in restrictive lung diseases because the patient’s inhaled volume is reduced, and there is a reduction in total lung capacity. In mild obstructive lung diseases, the IC is usually normal. In moderate and severe obstructive diseases, the IC can be reduced because the resting expiratory level of the functional residual capacity has increased because of hyperinflation of the lungs. An increase in IC may occur when the patient inhales from below the resting expiratory level when the measurement is performed; athletes and musicians who play wind instruments may also have increased inspiratory capacities. Therapists use the measurement of IC in clinical protocols to decide between methods of lung expansion therapy.

Which of the Following Statements Is True About Inspiratory Capacity