Correct Answer: A

Rationale: The correct answer is A: 'There is no fluctuation in the water seal chamber.' In a client with a pneumothorax being treated with a chest tube, the absence of fluctuation in the water seal chamber indicates that the lung has re-expanded. This finding suggests that there is no air leak from the lung into the pleural space. Choices B and C are incorrect because continuous bubbling in the suction control chamber or tidaling in the water seal chamber would suggest ongoing air leakage, indicating that the lung has not fully re-expanded. Choice D is also incorrect as the position of the drainage system does not directly indicate lung re-expansion.

Correct Answer: B

Rationale: During an acute exacerbation of Crohn's disease, the nurse should maintain the client on a low-residue diet. This diet helps to minimize bowel irritation by reducing the volume and frequency of stools. Choices A, C, and D are incorrect. Encouraging the client to increase dietary fiber (Choice A) and eat a high-fiber diet (Choice D) can worsen symptoms and aggravate bowel inflammation in Crohn's disease. Providing the client with frequent high-calorie snacks (Choice C) may not be appropriate during an exacerbation since high-fat foods can be harder to digest and may exacerbate symptoms.

Correct Answer: D

Rationale: The correct answer is D because clients taking spironolactone should have their potassium levels checked regularly. Spironolactone is a potassium-sparing diuretic, meaning it helps the body retain potassium and can lead to hyperkalemia if levels become too high. Choices A, B, and C are incorrect because avoiding foods high in potassium, sodium, or monitoring blood pressure are not specific to the teaching related to spironolactone.

Correct Answer: C

Rationale: The correct answer is C. Pacing spikes after the QRS complex indicate a malfunction of the pacemaker and should be reported. Choice A is not directly related to the pacemaker function. Choice B, hiccups, are common and not typically associated with pacemaker issues. Choice D, a heart rate of 90 beats per minute, is within the normal range and does not indicate a pacemaker malfunction.

Correct Answer: C

Rationale: The correct answer is C. A potassium level of 2.8 mEq/L is low and should be reported to the provider. Furosemide can cause potassium depletion, leading to hypokalemia. Low potassium levels can result in cardiac dysrhythmias, which is a serious concern in clients with heart failure. Choices A, B, and D are within normal ranges and do not require immediate reporting. Sodium level of 140 mEq/L, heart rate of 82/min, and oxygen saturation of 95% are all acceptable findings.