A client is using an incentive spirometer on the first postoperative day after an inguinal herniorrhaphy. The practical nurse (PN) should reteach the proper use of the spirometer when the client demonstrates which action?

A. Using a tight seal around the mouthpiece: Maintaining a tight seal ensures accurate measurement of inspired air volume and prevents air leakage. This is an appropriate action that promotes lung expansion and prevents postoperative atelectasis. B. Sitting upright during the treatment: The upright position allows maximum lung expansion and optimal diaphragmatic movement. This position enhances the effectiveness of deep breathing exercises using the incentive spirometer. C. Blowing forcefully into the mouthpiece: The client should inhale slowly and deeply through the mouthpiece, not blow into it. Forcefully exhaling indicates misuse of the device, as the purpose is to encourage sustained inspiration to expand the alveoli and improve ventilation. D. Exhaling slowly after two seconds: Slow exhalation after holding the breath allows gradual air release and helps maintain alveolar inflation. This step supports proper technique following the deep inhalation performed during incentive spirometry.