A nurse is reinforcing teaching with a client who is scheduled for a cardiac catheterization. Which of the following should the nurse tell the client to expect during injection of the contrast medium?

The correct answer is choice C: Blood pressure change from 118/78 mm Hg to 86/50 mm Hg.

Choice C rationale: A significant drop in blood pressure can indicate various serious conditions, such as shock, hemorrhage, or a severe infection. The nurse should assess the client further and intervene as necessary to prevent complications.

Choice A rationale: The change in temperature may indicate the onset of a fever and requires further assessment, but it is not as immediately concerning as the sudden drop in blood pressure.

Choice B rationale: The change in respiratory rate could be a result of factors like pain, anxiety, or exercise. While it warrants further assessment, it is not as critical as the blood pressure change.

Choice D rationale: The heart rate change may be a response to medications, rest, or other factors. It should be monitored and assessed, but the priority finding is the blood pressure change, which may indicate a more severe underlying issue.

The correct answer is choice A, Perform suctioning. Restlessness and crackles in the lungs may indicate respiratory distress or airway obstruction, which may be due to mucus or secretions blocking the tracheostomy tube. Performing suctioning helps clear the airway of secretions, which will improve the client's breathing. Choice B is incorrect because instilling saline into the tubing is not a common intervention for managing restlessness and crackles. Choice C is incorrect because checking the cuff pressure is not related to managing restlessness and crackles. Choice D is incorrect because increasing humidification is not a common intervention for managing restlessness and crackles.

Other choices:

Instill saline into the tubing: Instilling saline into the tubing is not a common intervention for managing restlessness and crackles.

Check the cuff pressure: Checking the cuff pressure is not related to managing restlessness and crackles.

Increase the humidification: Increasing humidification is not a common intervention for managing restlessness and crackles.