The nurse discovers that an older client with no history of cardiac or renal disease has an elevated serum magnesium level. To further investigate the cause of this electrolyte imbalance, what information is most important for the nurse to obtain from the client's medical history?

The correct answer is choice D: Begin chest compressions at 100/minute.

Choice A rationale:

Observing for swelling at the fracture site is not immediately relevant in this emergency situation. The priority is to address the lack of pulse and respiration.

Choice B rationale:

Analyzing the cardiac rhythm in another lead is unnecessary when the patient has no pulse and is not breathing. Immediate life-saving measures are required.

Choice C rationale:

Obtaining a 12-lead electrocardiogram is not the priority in this scenario. The patient needs immediate resuscitation efforts.

Choice D rationale:

Beginning chest compressions at 100/minute is the correct intervention. The absence of a carotid pulse and spontaneous respirations indicates cardiac arrest, and chest compressions are essential to maintain circulation and oxygenation until further help arrives.

A) Incorrect- Dullness bilaterally on percussion is not a normal finding, but it is not an immediate concern after thoracentesis. It may indicate fluid accumulation or consolidation in both lungs, which could be related to other conditions such as pneumonia or heart failure.
B) Incorrect- Serosanguinous drainage from the chest tube is expected after thoracentesis, as long as it is not excessive or continuous. The nurse should monitor the amount and color of the drainage and document it accordingly.
C) Incorrect- Diminished breath sounds in the left lower lobe are also expected after thoracentesis, as the procedure removes fluid and air from the pleural space and reduces lung expansion. The nurse should auscultate the lungs before and after the procedure and compare the findings. The breath sounds should improve gradually as the lung re-expands.
D) Correct- This is a sign of tension pneumothorax, which is a life-threatening complication of thoracentesis. Tension pneumothorax occurs when air accumulates in the pleural space and creates positive pressure that pushes the mediastinum (the heart, great vessels, and trachea) to the opposite side of the chest. This can impair venous return, cardiac output, and respiratory function. The nurse should report this finding to the healthcare provider immediately and prepare to assist with needle decompression or chest tube insertion.