Medication Reconciliation in a Patient with Heart Failure and CKD
Mr. J is an 82-year-old man with heart failure with reduced ejection fraction (HFrEF, EF 30%), chronic kidney disease stage 3b (eGFR 38 mL/min/1.73 m²), and osteoarthritis. He lives alone and manages his own medications. He presents to the clinic with a 3-day history of worsening shortness of breath, 5-lb weight gain, and increased leg swelling. His current medications include: furosemide 40 mg daily, lisinopril 20 mg daily, carvedilol 6.25 mg twice daily, spironolactone 25 mg daily, metformin 500 mg twice daily, ibuprofen 400 mg three times daily as needed for knee pain, and atorvastatin 20 mg daily. He reports taking all medications as prescribed but admits he has been using ibuprofen more frequently due to knee pain. His blood pressure is 150/90 mm Hg, heart rate 88, and oxygen saturation 92% on room air. Labs: potassium 5.8 mEq/L, creatinine 2.1 mg/dL (baseline 1.6), BNP 1200 pg/mL.
1. Which medication(s) are most likely contributing to his current decompensation and hyperkalemia? Prioritize the top two and explain the mechanism.
Read the worked answer
The top two culprits are ibuprofen and spironolactone.
- Ibuprofen (NSAID): inhibits prostaglandin synthesis, causing afferent arteriolar vasoconstriction and reduced renal blood flow. This worsens CKD, blunts the effect of furosemide and lisinopril, and promotes sodium and fluid retention, leading to HF exacerbation. It also reduces potassium excretion, contributing to hyperkalemia.
- Spironolactone (aldosterone antagonist): directly reduces potassium excretion in the distal nephron. In the setting of CKD and NSAID use, the risk of hyperkalemia is markedly increased.
Lisinopril also raises potassium, but the acute change (new NSAID use) points to ibuprofen as the primary driver. Metformin is a minor contributor (risk of lactic acidosis with worsening renal function) but not the main cause of hyperkalemia or fluid overload.
2. What immediate medication adjustments would you recommend, and what monitoring plan would you set?
Read the worked answer
- Discontinue ibuprofen immediately; recommend acetaminophen (max 3 g/day) for osteoarthritis pain and consider topical NSAID or nonpharmacologic measures.
- Hold spironolactone until potassium <5.0 mEq/L and renal function stabilizes; recheck potassium and creatinine within 3–5 days.
- Continue furosemide but consider increasing dose temporarily (e.g., to 80 mg daily) for volume overload, with daily weights and strict I/O.
- Continue lisinopril and carvedilol unless hypotension or worsening renal function (creatinine rise >30%) occurs; monitor BP and renal function.
- Hold metformin temporarily given AKI on CKD; recheck eGFR and restart if stable.
- Patient education: avoid all NSAIDs, recognize signs of hyperkalemia (weakness, palpitations), and follow up in 1 week with repeat BMP.