Quick answer
How should I present a contrast-induced acute kidney injury case on rounds?
Open with the timing relative to his contrast CT and his known baseline kidney disease, since both are essential context for interpreting the creatinine rise. Give the exact creatinine trend from his documented baseline, plus BUN, potassium, and urine microscopy, before naming acute tubular necrosis. End with stopping nephrotoxic medications, supportive fluids, and monitoring, and note the generally good prognosis.
Before you speak
Define the moment and the information you actually have
An urgent presentation 48 hours after a contrast-enhanced CT, once repeat labs return.
A supervising physician deciding on nephrotoxin avoidance and monitoring.
History, medications, social history, and creatinine, BUN, potassium, and urine microscopy. Vital signs and a formal fluid-status exam are described only as unremarkable, without exact numbers.
About 75 seconds
Fictional training case: The presentation is locked to the simulated patient JSON. It names important unknowns instead of inventing an examination, vital signs, allergies, or tests.
Complete spoken example
First, read it once without stopping
The paragraph breaks show the clinical shape. In a real presentation, pause briefly between ideas rather than announcing the headings.
Mr. Allen is a 64-year-old man with baseline stage 3 chronic kidney disease who presents 48 hours after a contrast-enhanced CT angiogram with decreased urine output and a rising creatinine.
He reports urinating less than 300 milliliters over the past day, along with ankle swelling and general malaise. He believes the contrast dye poisoned his kidneys and is worried he will need emergency dialysis.
His history includes stage 3a chronic kidney disease with a baseline eGFR of 45, hypertension, and peripheral artery disease, for which he takes lisinopril and atorvastatin; he is a retired plumber and ex-smoker.
His creatinine has risen from a documented baseline of 1.6 to 3.4, blood urea nitrogen is elevated at 54, and potassium is elevated at 5.1. Urine microscopy shows numerous muddy brown granular casts and renal tubular epithelial cells.
My diagnosis is contrast-induced acute kidney injury manifesting as acute tubular necrosis, based on the timing after contrast exposure, the creatinine rise from his documented baseline, the elevated potassium, and the muddy brown casts on urine microscopy.
I would hold his lisinopril and any other nephrotoxic agents, provide isotonic IV fluid hydration, monitor his intake and output along with daily electrolytes and acid-base status closely given his elevated potassium, and avoid any further contrast exposure. The prognosis for recovery within one to two weeks is generally good with supportive care.
Build the presentation
Give every sentence one job
A presentation is a compressed clinical argument, not a chart read aloud. These six moves keep the facts connected to your reasoning.
Opening one-liner
Anchor the timing to the contrast exposure
“Mr. Allen is a 64-year-old man with baseline stage 3 chronic kidney disease who presents 48 hours after a contrast-enhanced CT angiogram with decreased urine output and a rising creatinine.”
Why it belongs: Naming his baseline kidney disease and the exact 48-hour timing relative to contrast exposure in the first sentence is what points directly toward contrast-induced injury rather than another cause of acute kidney injury.
This is a 64-year-old with kidney problems and low urine output.
He has baseline stage 3 chronic kidney disease and presents 48 hours after contrast CT with decreased urine output and a rising creatinine.
Why: Naming the specific timing relative to contrast exposure is the key diagnostic clue, not just 'low urine output.'
History of present illness
Give the specific symptoms and his own theory
“He reports urinating less than 300 milliliters over the past day, along with ankle swelling and general malaise. He believes the contrast dye poisoned his kidneys and is worried he will need emergency dialysis.”
Why it belongs: A specific, quantified oliguria threshold is more useful than 'less urine,' and naming his fear of needing dialysis allows it to be addressed directly in the plan.
He's not urinating much and has some swelling.
He is urinating less than 300 milliliters over the past day, with ankle swelling and malaise.
Why: A specific quantified volume is more clinically useful than a vague description.
Relevant background
Confirm his baseline kidney function and medications
“His history includes stage 3a chronic kidney disease with a baseline eGFR of 45, hypertension, and peripheral artery disease, for which he takes lisinopril and atorvastatin; he is a retired plumber and ex-smoker.”
Why it belongs: Knowing his baseline eGFR is essential context for interpreting how significant the current creatinine rise actually is, and lisinopril is a medication that may need to be held during acute kidney injury.
He has some kidney and heart problems.
He has baseline stage 3a chronic kidney disease with an eGFR of 45, and takes lisinopril, which may need to be held.
Why: Naming the baseline eGFR gives the listener the comparison point needed to interpret today's labs.
Objective data
State the creatinine trend and other labs
“His creatinine has risen from a documented baseline of 1.6 to 3.4, blood urea nitrogen is elevated at 54, and potassium is elevated at 5.1. Urine microscopy shows numerous muddy brown granular casts and renal tubular epithelial cells.”
Why it belongs: Stating the creatinine as a trend from a known baseline, rather than a single number, is what actually quantifies the severity of this acute injury, and the muddy brown casts are a specific finding pointing to acute tubular necrosis rather than another cause.
His creatinine is high and his urine test showed some abnormal cells.
His creatinine rose from a baseline of 1.6 to 3.4, and urine microscopy shows muddy brown granular casts.
Why: Naming the trend from baseline and the specific microscopic finding is more diagnostic than an isolated high number.
Assessment
Commit to the diagnosis and its likely cause
“My diagnosis is contrast-induced acute kidney injury manifesting as acute tubular necrosis, based on the timing after contrast exposure, the creatinine rise from his documented baseline, the elevated potassium, and the muddy brown casts on urine microscopy.”
Why it belongs: Naming the specific mechanism, acute tubular necrosis, rather than just 'kidney injury,' reflects the pattern shown by the urine microscopy and shapes the expected recovery course.
His kidneys are injured from the contrast dye.
This is contrast-induced acute kidney injury manifesting as acute tubular necrosis, based on the timing, creatinine trend, and urine microscopy findings.
Why: Naming the specific mechanism reflects the pattern shown on urine microscopy and informs the expected course.
Plan
State nephrotoxin avoidance and supportive care
“I would hold his lisinopril and any other nephrotoxic agents, provide isotonic IV fluid hydration, monitor his intake and output along with daily electrolytes and acid-base status closely given his elevated potassium, and avoid any further contrast exposure. The prognosis for recovery within one to two weeks is generally good with supportive care.”
Why it belongs: Naming the specific medication to hold, rather than a general statement about nephrotoxins, and stating the expected recovery timeframe gives the listener a concrete, actionable, and appropriately reassuring plan.
I'll stop his kidney-unfriendly medications and give fluids.
I would hold his lisinopril, provide isotonic IV fluids, and monitor potassium closely given his current level of 5.1.
Why: Naming the specific medication and the specific lab value being monitored is more actionable than a general statement.
Do not fill the blanks
Say what has not yet been established
Real presentations often happen before the chart is complete. A brief, explicit limitation is safer and more credible than a polished invention.
Vital signs and volume-status exam
Say: “Exact vital signs and a detailed volume-status exam beyond 'normal vitals with mild pedal edema' are not itemized in this simulation, and I would assess them directly to guide fluid management.”
Fluid management in acute kidney injury depends on an accurate assessment of volume status, not an assumption of normality.
Repeat renal function trend
Say: “A repeat creatinine and a documented urine-output trend over the next 24 to 48 hours are not yet available in this simulation and would confirm whether this is improving as expected.”
A single creatinine value does not confirm the trajectory of recovery; serial monitoring does.
Clinical compression
What leads, what stays, and what can wait?
| Source detail | Decision | Reason |
|---|---|---|
| Decreased urine output and rising creatinine 48 hours after contrast CT | Lead | This exact timing relative to contrast exposure is the central diagnostic clue. |
| Documented baseline creatinine of 1.6 rising to 3.4 | Lead | The trend from a known baseline quantifies the severity more precisely than an isolated value. |
| Retired plumber, ex-smoker | Omit | This detail does not change the acute management decision. |
| Elevated potassium of 5.1 | Include | It requires active monitoring given the risk of hyperkalemia in acute kidney injury. |
| Muddy brown granular casts on urine microscopy | Lead | This specific finding supports acute tubular necrosis as the mechanism. |
After the presentation
Likely attending questions
Answer the question first, then give the evidence. If the source case does not contain the answer, say what you would verify.
Why does it matter that you compared his creatinine to a documented baseline?
A single elevated creatinine value without a baseline could reflect long-standing chronic kidney disease rather than a new acute injury; comparing to his known baseline of 1.6 shows this is a genuine acute rise to 3.4, which is what defines acute kidney injury here.
Why hold his lisinopril specifically?
ACE inhibitors like lisinopril reduce glomerular filtration pressure and can worsen acute kidney injury or contribute to hyperkalemia, so holding it during the acute injury and reassessing once kidney function recovers is standard practice.
What would change your management if his potassium kept rising?
Worsening hyperkalemia despite conservative measures, especially with ECG changes, would prompt more urgent potassium-lowering treatment and reassessment of whether temporary dialysis support is needed, though his current course is expected to be manageable conservatively.
Self-check
A 30-second check before you present
- State the exact timing relative to the contrast exposure in the opening sentence.
- Name his baseline kidney disease and eGFR.
- Compare his current creatinine to a documented baseline, not just an isolated value.
- State the potassium value and why it needs monitoring.
- Name the specific urine microscopy finding, not just 'abnormal urine.'
- Name the specific mechanism, acute tubular necrosis, not just 'kidney injury.'
- Name the specific medication being held.
- State the expected recovery timeframe honestly, without over-promising.
Common presentation problems
Repair the habits that make a case hard to follow
Reporting an elevated creatinine without a baseline for comparison
Repair: State his documented baseline and how much it has risen.
Continuing his ACE inhibitor without comment
Repair: State explicitly that lisinopril is being held during the acute injury.
Assuming stability without describing volume status
Repair: State that a detailed volume-status exam is still needed to guide fluid management.
Promising full recovery with certainty
Repair: State that the prognosis is generally good but recovery still needs to be confirmed with follow-up labs.
Frequently asked questions
Oral case presentation questions
Should I mention preventive measures for future contrast exposures?
Yes, briefly, noting that future contrast studies should be avoided when possible or use preventive hydration protocols, given his demonstrated risk.
Do I need to calculate FENa in the presentation?
You can mention that the urine findings are consistent with acute tubular necrosis; a specific FENa calculation is useful supporting detail but not essential to state unless asked.
How long should this presentation be?
This worked example targets about 75 seconds. A patient with severe hyperkalemia or anuria would need a more urgent, focused presentation.
Practice out loud
Turn the patient encounter into your own presentation
Bedside English lets you interview an AI patient, then practice presenting the collected case to an AI attending and respond to follow-up questions.
Editorial record
Sources, provenance, and review boundary
The patient facts come from simulated case nephro_001. Clinical framing and presentation design were checked against the sources below. This page teaches clinical communication and reasoning; it is not medical advice or a local protocol.
- KDIGO Clinical Practice GuidelinesKidney Disease: Improving Global Outcomes · accessed 2026-09-03
- Feedback on Oral Presentations during RoundsStanford Medicine · accessed 2026-09-03
- Clinical Teaching Tools: OMP and SNAPPSUCSF Medical Education · accessed 2026-09-03
Published: · Last source, safety, and language review: