Day 4 of Vancomycin and Ketorolac: Rising Creatinine and a Supratherapeutic Trough

This is acute kidney injury with a supratherapeutic vancomycin level, most likely from combined vancomycin and NSAID nephrotoxicity - not simply dehydration.

• Creatinine 2.4 from a baseline of 0.9 is roughly a 2.7-fold rise, which meets KDIGO stage 2 criteria; oliguria (300 mL/12 hr ≈ 25 mL/hr) corroborates it.
• Trough 28 mcg/mL exceeds the usual 10–20 mcg/mL target for serious MRSA infection. High troughs correlate with accumulation once clearance falls - the level and the creatinine are telling the same story.
• Ketorolac around the clock for 4 days causes afferent arteriolar vasoconstriction and reduced renal perfusion; combined with vancomycin's tubular toxicity, the effect is more than additive. Older age and hypertension add risk.
• The volume picture is mixed, not simply dry: 2 kg weight gain, bibasilar crackles, and ankle edema indicate extravascular fluid, while the rising BUN suggests reduced effective circulating volume. Do not reflexively bolus several liters.
• The infection may also contribute: temp 37.9 °C, tachycardia, and fatigue mean sepsis-driven renal injury belongs on the differential even though the leg is improving.

• Hold the vancomycin and hold the ketorolac, then notify the provider immediately with SBAR. With a creatinine of 2.4 and a trough of 28, giving the scheduled dose is a foreseeable harm; holding a dose and escalating is within nursing scope and is the safer default.
• Ask for specific orders: renal dosing and pharmacy consult, repeat vancomycin level/AUC-based monitoring, an alternative analgesic, and cultures or imaging if sepsis is a concern.
• Assess volume status rather than guessing: strict intake and output, daily weight, orthostatics if safe, lung and edema exam, and a focused look for other nephrotoxins (contrast, ACE inhibitors, NSAIDs the patient takes at home).
• Request labs: repeat creatinine and electrolytes including potassium, since AKI plus spironolactone-like or ACE-inhibitor therapy can cause hyperkalemia; consider a urinalysis.
• Document the assessment, the held doses, the notification time, and the provider's response. If the provider cannot be reached and the order stands, escalate to the covering provider or charge nurse.

Monitoring:

• Hourly or per-order urine output with a strict I&O record; report <0.5 mL/kg/hr for 2 consecutive hours.
• Daily weight at the same time on the same scale.
• Creatinine and electrolytes at least daily, potassium and bicarbonate in particular; watch for hyperkalemia and acidosis.
• Continue to assess for sepsis (temperature, mentation, perfusion) and for volume overload (crackles, edema, oxygenation), since the therapy for one can worsen the other.
• If vancomycin continues, follow AUC- or trough-based monitoring per pharmacy and watch for infusion reactions and ototoxicity.

Teaching:

• Explain in plain terms why the pain medicine changed: "This anti-inflammatory has been hard on your kidneys, so we're switching to something safer."
• Ask him to report decreased urine, swelling, or feeling more tired, and to avoid over-the-counter ibuprofen or naproxen at home - write it down.
• Tell him to report ringing in the ears or hearing change, and rash or flushing during the infusion.
• Flag the need to call for help to the bathroom - fatigue plus new AKI plus age makes falls likely, and the discharge medication list must reflect the NSAID avoidance and any renal dose adjustments.