A client with congestive heart disease returns to the clinic with muscle aching. The physician orders a potassium level, which shows hypokalemia. The drug regimen includes furosemide (Lasix) 80 mg b.i.d. In addition to treatment with a potassium supplement, the nurse administers which of the following prescribed drugs?

Correct Answer: C

Rationale: Spironolactone (C), a potassium-sparing diuretic, counters furosemide’s potassium loss. Bumetanide (A) and torsemide (B) are loop diuretics, clonidine (D) is an antihypertensive.

Correct Answer: C

Rationale: Given t_total = t_as + t_ad + t_vs + t_vd, solving for t_vd: subtract all other phases from t_total. t_vd = t_total - (t_as + t_ad + t_vs). Option C, t_total - (t_as + t_vs), is correct, assuming t_ad is included in the total but not explicitly subtracted here.

Correct Answer: A

Rationale: MI pain results from insufficient oxygenation of cardiac muscle due to blocked coronary arteries, causing ischemia. Overload or imbalance may contribute to other conditions but not directly to MI pain.

Correct Answer: D

Rationale: Thrombolytic therapy effectiveness in acute MI depends on time since symptom onset (ideally within 6-12 hours), as it dissolves clots to restore blood flow. History (A), aspirin sensitivity (B), and MI specifics (C) are secondary to this time-sensitive factor.

Correct Answer: B

Rationale: A drop from 350,000 to 65,000 platelets suggests heparin-induced thrombocytopenia (HIT), an adverse reaction requiring immediate reporting and heparin cessation. A and C misinterpret the issue, and D is a subsequent step.