Correct choice is (a) Lung collapse
The best explanation: A spirometer is used to help the lungs regain their strength. After a surgery, due to the use of the ventilator, the lungs may feel a little abnormal and may have a weakness. This is also possible due to age. The person is made to breathe into the spirometer to exercise their lungs and regain normal lung function. Normally, 10 to 15 breaths with the spirometer every 1 to 2 hours is prescribed, or as often as instructed by your nurse or doctor.