Correct Answer: A

Rationale: The correct answer is A: Potassium 3.5 mEq/L. Digoxin can cause hypokalemia as an adverse effect. Monitoring potassium levels is crucial because low potassium levels can increase the risk of digoxin toxicity. Choices B, C, and D are incorrect as they are not directly associated with potential adverse effects of digoxin. Sodium levels are not typically affected by digoxin, calcium levels are not a primary concern with digoxin therapy, and magnesium levels are not the most important to monitor for digoxin adverse effects.

Correct Answer: B

Rationale: The correct answer is B because a new onset of tachypnea can indicate a respiratory complication, which requires immediate assessment. Sinus arrhythmia, epidural analgesia with weakness, and a hemoglobin A1C level of 6.8% in a client with diabetes do not pose immediate life-threatening concerns that require urgent assessment compared to the potential respiratory issues associated with tachypnea.

Correct Answer: D

Rationale: Following an amniocentesis at 33 weeks of gestation, the nurse should monitor the client for contractions. Contractions can indicate preterm labor, which requires immediate attention. Vomiting, hypertension, and epigastric pain are not typically associated with amniocentesis complications at this gestational age.

Correct Answer: C

Rationale: In Cushing's disease, there is increased cortisol production, which can lead to various metabolic disturbances. One of the common findings is an increased serum potassium level. The other options are incorrect because Cushing's disease typically causes hyperglycemia, not decreased serum glucose levels (A), lymphocytopenia, not increased lymphocyte count (B), and hyponatremia, not decreased serum sodium level (D).

Correct Answer: D

Rationale: In clients with cirrhosis, the liver is unable to produce clotting factors efficiently, leading to impaired clotting function. Therefore, an increased prothrombin time is expected in cirrhosis. Choices A, B, and C are incorrect. Decreased bilirubin levels are not typically seen in cirrhosis; prothrombin time is usually increased, not decreased; and albumin levels are often decreased in cirrhosis due to reduced synthetic liver function.