Correct Answer: C

Rationale: Ethambutol is associated with potential vision changes, including optic neuritis. Patients should be instructed to report any visual disturbances immediately to prevent permanent vision loss. Monitoring for changes in vision is crucial to detect any adverse effects early on and prevent serious complications.

Correct Answer: B

Rationale: The correct answer is the statement 'I take antacids several times a day.' Antacids can alter the absorption of heparin, potentially affecting its effectiveness and increasing the risk of clot formation. This is a significant concern as it can impact the therapeutic outcome of heparin therapy. The other statements are not directly related to potential complications or interactions with heparin therapy.

Correct Answer: C

Rationale: Pursed-lip breathing is a breathing technique that involves inhaling slowly through the nose and exhaling gently through pursed lips. This technique helps improve breathing efficiency and can be beneficial for individuals with respiratory conditions. Instructing the client to take a deep breath in through the nose is essential for proper execution of pursed-lip breathing, making choice C the correct answer.

Correct Answer: B

Rationale: Monitoring the effectiveness of tuberculosis medication is crucial to ensure the treatment is working properly. Regular sputum samples help in assessing the response to the medication. This monitoring can guide adjustments in the treatment plan if needed. Options A and C are incorrect as they do not reflect essential aspects of tuberculosis treatment. Option D is not a standard recommendation for tuberculosis treatment and may lead to misconceptions.

Correct Answer: B

Rationale: In a client with a pneumothorax, the priority action for the nurse is to obtain a large-bore IV needle for decompression. This intervention helps to relieve the pressure in the pleural space, allowing the lung to re-expand. Prompt decompression is crucial in managing a tension pneumothorax, which can be life-threatening. Assessing pain, administering medication, and preparing for chest tube insertion are important, but they should follow the immediate intervention of decompression in a critical situation like a tension pneumothorax.