The nurse is gathering data on a client with a diagnosis of tuberculosis. The nurse should review the results of which diagnostic test to confirm this diagnosis?

A. Respiratory alkalosis: Respiratory alkalosis is generally associated with hyperventilation and is not directly caused by tension pneumothorax. In tension pneumothorax, the primary issues are related to pressure changes within the thoracic cavity, not respiratory alkalosis.

B. Increased venous return: In tension pneumothorax, venous return is actually decreased due to the increased intrathoracic pressure compressing the great vessels, which impedes blood flow back to the heart.

C. Decreased cardiac output: Tension pneumothorax causes a significant increase in intrathoracic pressure, leading to compression of the heart and great vessels, which results in decreased venous return and ultimately decreased cardiac output. This is a critical and life-threatening consequence of tension pneumothorax.

D. Dilated ventricles: Dilated ventricles are more commonly seen in chronic heart conditions such as heart failure, rather than in acute tension pneumothorax. Tension pneumothorax typically results in reduced ventricular filling rather than dilation.

A. Repeat blood serum potassium: While it’s important to monitor potassium levels, the immediate priority when preparing to administer potassium is ensuring safe administration practices, not rechecking levels before initiating therapy.

B. Educate client regarding high-potassium food sources: Client education is important for long-term management but is not a priority when preparing for intravenous potassium replacement in an acute setting.

C. Cardiac monitoring during infusion: Potassium affects cardiac conduction, and rapid correction can lead to arrhythmias. Continuous cardiac monitoring is necessary to detect any life-threatening arrhythmias during the infusion.

D. Ensure that the client's urine output is at least 1 mL/kg/hour: Adequate urine output ensures that the kidneys are functioning and capable of excreting excess potassium, reducing the risk of hyperkalemia.

E. Ensure potassium infusion is prepared with 5% dextrose solution: Potassium should not be mixed with dextrose, as it can increase insulin release, causing potassium to shift into cells and worsen hypokalemia.