The Daily Differential — Thursday, September 24, 2026

Dialysis-Related Emergencies

Missed dialysis can rapidly become a lethal combination of hyperkalemia, pulmonary edema, and acidemia. Temporizing measures buy time; dialysis is often the definitive treatment.

Also known ashemodialysis complications · dialysis complications · dialysis access problems · missed dialysis

By the Blue Fish Med Desk Sep 24, 2026 · Phoenix

0:00 / –:–– AI‑generated audio

A 64-year-old man arrives after missing two dialysis sessions because his ride never came. He sits bolt upright, breathing in short bursts; his shoes leave deep marks at his ankles. The monitor shows peaked T waves, and his blood pressure is 198/106. The next move is still yours.

— What’s your move? Read on.

Before you read

What must happen before definitive correction of his electrolyte and volume problems?
Which common “fix” should not delay definitive care?

When to Think of It

Think dialysis emergency with missed or inadequate sessions, access failure, dyspnea, weakness, confusion, chest pain, dysrhythmia, or unexplained shock. Look for pulmonary edema, hyperkalemic ECG changes, uremic complications, and evidence of infection or access thrombosis.

Sick or Not Sick

The key fork is immediate threat to life or organ function—especially unstable dysrhythmia, severe respiratory distress, shock, or significant hyperkalemic ECG changes—versus a stable patient who can undergo expedited assessment and dialysis planning.

The First Fifteen Minutes

Unstable or hypoxemic: Oxygen to maintain adequate saturation; use noninvasive ventilation for persistent work of breathing if the patient can protect their airway, and intubate if failing. Obtain continuous ECG monitoring, IV access, point-of-care glucose, ECG, electrolytes, blood gas, and renal panel; call nephrology/dialysis early when urgent dialysis is likely.
Hyperkalemic ECG changes or peri-arrest: Calcium gluconate 1 g IV (10 mL of 10% solution) over 2–5 minutes; repeat ECG and repeat the dose if changes persist. It stabilizes myocardial membranes but does not lower potassium. Use calcium chloride 1 g IV through secure central access for arrest or profound instability when appropriate; it is more caustic to peripheral veins.
Significant hyperkalemia requiring intracellular shift: Regular insulin 10 units IV plus dextrose 25 g IV (for example, 50 mL D50); check glucose frequently and recheck potassium. Add albuterol 10–20 mg by nebulization as an adjunct; it shifts potassium intracellularly but is not definitive.
Severe hypertension with pulmonary edema: If blood pressure permits, nitroglycerin 0.4 mg SL every 5 minutes for up to 3 doses while arranging ongoing care; it reduces preload and afterload. For persistent severe distress/hypertension, IV nitroglycerin may be started at 10–20 mcg/min and titrated to response.
Avoid routine potassium binders or bicarbonate as a substitute for urgent dialysis in a patient with ECG toxicity; bicarbonate is most useful when significant metabolic acidemia is present.

Definitive Care & Disposition

Urgent hemodialysis is definitive for refractory or severe hyperkalemia, pulmonary edema not responding to initial support, severe acidemia, or uremic complications such as encephalopathy or pericarditis. Identify the precipitant—missed session, access malfunction, medication/dietary cause, or infection—and treat it. Admit patients with urgent dialysis needs, significant electrolyte or respiratory abnormalities, suspected infection, or unsafe access; a stable patient may be discharged only after the underlying issue is addressed and a reliable dialysis plan is confirmed.

How This One Kills

Treating the ECG or number rather than the patient—and assuming insulin, albuterol, or a potassium binder has solved the problem—can leave a patient with ongoing potassium release and sudden fatal dysrhythmia while dialysis is delayed.

The Differential — What Else Looks Like This

Acute coronary syndrome — ischemic symptoms or dynamic regional ECG changes support it; mistaking it for “just uremia” delays reperfusion assessment.
Pulmonary embolism — abrupt dyspnea, hypoxemia, and right-heart strain without volume-overload findings; mislabeling it pulmonary edema delays a time-critical workup.
Access infection or sepsis — fever, rigors, hypotension, or focal access inflammation; attributing shock to dialysis-related volume shifts delays source control and antibiotics.

The Second-Day Story

Older adults may present with weakness, falls, nausea, confusion, or “not feeling right,” without dramatic dyspnea or a clear history of missed sessions. Beta-blockade or a pacemaker can blunt expected tachycardia, and a reassuring-looking ECG does not exclude dangerous hyperkalemia. Check the dialysis history, ECG, potassium, volume status, and access rather than relying on a textbook symptom pattern.

Back to Our Patient

Back to our 64-year-old with the ankle marks and peaked T waves. Recognize missed dialysis with pulmonary edema and likely hyperkalemia; risk-stratify him as immediately high risk because of respiratory distress and ECG changes. Start monitoring and respiratory support, give IV calcium for the ECG toxicity and insulin with dextrose to shift potassium, and use nitroglycerin if his severe hypertension persists. These measures are a bridge, not a cure: arrange urgent hemodialysis and admit him for definitive treatment and evaluation of why he missed his sessions.

Patient Presentation to Attending

How you’d present this patient on the floor — tight, pertinent positives and negatives, no rambling

“This is a 64-year-old man with end-stage kidney disease on hemodialysis presenting with worsening dyspnea after missing two sessions. He is orthopneic with progressive leg swelling and denies fever, chest pain, or access-site pain. He is hypertensive, hypoxemic, and working to breathe, with bilateral crackles and a functioning access with a palpable thrill. ECG shows peaked T waves; potassium is 6.8, and chest imaging is consistent with pulmonary edema. I’m concerned for volume overload with clinically significant hyperkalemia, with acute coronary syndrome and infection less likely but still under assessment. He is on continuous monitoring and respiratory support, has received membrane stabilization and intracellular potassium-shifting therapy, and needs urgent dialysis. I recommend ICU-level admission while nephrology arranges dialysis.”

Study Directive

From memory, list the urgent dialysis indications and distinguish temporizing hyperkalemia treatments from definitive potassium removal.
Review your institution’s hyperkalemia pathway; practice ordering calcium, insulin/dextrose, and repeat glucose/potassium checks without prompting.
In a simulated case, give a 30-second handoff that includes missed sessions, access status, ECG, potassium, respiratory status, and dialysis urgency.

Recent Literature

Review or guideline ISPD peritonitis guideline recommendations: 2022 update on prevention and treatment
Li PK, Chow KM, Cho Y, et al. · Perit Dial Int, 2022 · PMID 35264029 · cited 708×

For suspected peritoneal dialysis–associated peritonitis, obtain dialysis effluent for testing and start prompt empiric antibiotics.

Full text · open access

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Renal Transplant Emergencies

Infection, obstruction, vascular compromise, rejection, and medication toxicity can all threaten a transplanted kidney—and some demand action before the...

Also known askidney transplant complications · renal allograft rejection · transplant rejection · transplant kidney failure

0:00 / –:–– AI‑generated audio

The Case

A 47-year-old woman, six weeks after a kidney transplant, says her urine has dwindled since yesterday. Her forehead is hot, and she winces when the clinician presses over the new graft. Her partner holds a list of unfamiliar medication names, none taken yet this morning. The first decision is still ahead.

Before You Read

Which transplant recipient needs immediate sepsis management rather than a wait for diagnostic certainty?
What bedside test can quickly identify a reversible obstructive cause of graft dysfunction?
Which medication history could change both the differential and the treatment plan?

Why It Matters

Infection, obstruction, vascular compromise, rejection, and medication toxicity can all threaten a transplanted kidney—and some demand action before the precise cause is known. Fever or acute graft dysfunction in an immunosuppressed patient warrants a low threshold for admission and transplant-team involvement.

When to Think of It

Consider an emergency with fever, graft-area pain, reduced urine output, hematuria, rising creatinine, hypertension, hypotension, or systemic illness. Ask about transplant timing, baseline function, missed or changed immunosuppressants, recent procedures, and prior resistant organisms; immunosuppression can mute classic infection signs.

Sick or Not Sick

The pivotal call is sepsis or threatened graft perfusion/obstruction now versus stable graft dysfunction. Shock, poor perfusion, anuria, severe electrolyte abnormality, or rapidly rising creatinine requires immediate resuscitation and urgent specialist involvement.

The First Fifteen Minutes

Obtain cultures (blood and urine when feasible before antibiotics), CBC, metabolic panel, urinalysis/culture, lactate if ill, ECG for significant hyperkalemia, and bedside bladder scan. Do not delay antibiotics for cultures in a patient with sepsis.
Sepsis or suspected serious bacterial infection: Give cefepime 2 g IV promptly, then use renal-adjusted maintenance dosing; add vancomycin 20–25 mg/kg IV loading dose when MRSA, line, or resistant gram-positive infection is a concern. Renal function, local resistance patterns, and transplant history affect selection and repeat dosing—check institutional protocol and involve pharmacy.
Hypoperfusion or shock: Give balanced crystalloid in reassessed boluses; avoid uncritical large-volume loading in a patient with oliguria, heart failure, or pulmonary edema. If hypotension persists after appropriate fluid, start norepinephrine 0.05–0.1 mcg/kg/min IV infusion, titrating to perfusion/MAP; it restores vascular tone.
Anuria or retention concern: Scan the bladder and assess for catheter obstruction/retention; obtain urgent renal transplant ultrasound with Doppler when obstruction or vascular compromise is possible. Contact the transplant team early.
Do not empirically stop or escalate immunosuppressants without transplant-team guidance; do not delay stabilization while awaiting rejection testing.

Definitive Care & Disposition

Admit patients with suspected graft pyelonephritis, sepsis, acute graft dysfunction, obstruction, anuria, significant electrolyte disturbance, or uncertain follow-up. Transplant ultrasound with Doppler helps assess hydronephrosis and vascular flow; further evaluation may include cultures, medication levels, and specialist-directed biopsy. Treat infection, obstruction, vascular complications, rejection, or drug toxicity according to the cause with transplant nephrology/urology involvement; avoid nephrotoxins when possible and adjust drug dosing to renal function.

How This One Kills

Calling an acutely failing graft “rejection” before excluding infection, obstruction, or vascular compromise can lead to harmful immunosuppression escalation—or lose the chance to relieve a reversible obstruction or restore perfusion.

The Atypical Presentation

Immunosuppression may blunt fever, leukocytosis, local tenderness, and the usual inflammatory response; older patients may present only with malaise, confusion, or a creatinine rise. A patient may also report normal urine output despite significant graft injury. Compare creatinine with baseline, check medication adherence and interactions, obtain urine testing, and have a low threshold for imaging and transplant consultation.

Back to Our Patient

Back to our 47-year-old six weeks after transplant, with dwindling urine, fever, and graft tenderness. Recognize acute graft dysfunction with possible infection; risk-stratify her as high risk because infection and threatened graft function are both plausible. Obtain cultures and renal testing promptly, start empiric IV antibiotics for suspected serious infection without waiting for results, assess perfusion and bladder emptying, and arrange urgent transplant ultrasound and transplant-team consultation. Admit her for workup and treatment of the cause, with sepsis escalation if perfusion worsens.

Patient Presentation to Attending

“This is a 47-year-old woman six weeks after kidney transplant presenting with one day of oliguria, fever, and pain over the graft. She reports no missed immunosuppressant doses, but we are confirming her regimen and checking for recent medication changes. She is febrile and tender over the graft; I’m assessing for sepsis and hemodynamic instability, with no known evidence yet of retention or obstruction. Initial testing shows acute creatinine elevation from baseline and pyuria; cultures are pending. My leading concern is graft pyelonephritis with acute graft dysfunction, while obstruction, rejection, and vascular compromise remain important alternatives. I recommend prompt IV antibiotics, urgent transplant ultrasound with Doppler, and immediate transplant-team consultation. She should be admitted, with escalation to critical care if she develops shock or worsening perfusion.”

Study Directive

Practice a focused transplant history: date, baseline creatinine, urine output, medications/adherence, recent changes, prior cultures, and access to the transplant team.
Review your local febrile-transplant pathway and renal-adjusted empiric antibiotic options.
Draw a differential for acute graft dysfunction— infection, obstruction, vascular issue, rejection, medication toxicity—and identify the first test or action for each.

Key Medications

Cefepime: 2 g IV initial dose for serious infection; maintenance must be renal-adjusted and may vary with indication and local protocol.
Vancomycin: 20–25 mg/kg IV loading dose when indicated; subsequent dosing should be guided by renal function and institutional monitoring.
Norepinephrine: Start 0.05–0.1 mcg/kg/min IV infusion for persistent septic shock; titrate to perfusion and protocol.
Antibiotic choice and dose depend on renal function, transplant medications, infection source, and prior cultures; check Lexicomp, UpToDate, or institutional guidance if uncertain. Pediatric regimens differ and are weight-based.

High-Yield Pearls

A creatinine “baseline” is essential: a value that looks normal in isolation may represent major graft dysfunction.
Transplant kidney denervation can make obstruction or infection less painful than expected; absence of classic colicky pain is not reassuring.
Medication reconciliation should include interactions and recent dose changes, not just whether the patient takes immunosuppressants.

The Mimics

Acute rejection — often graft dysfunction with little or no fever; confusing it with infection can make empiric immunosuppression dangerous.
Medication toxicity — recent dose change or interacting medication may point to toxicity; missing it can worsen graft injury by continuing the offending exposure.
Obstructive uropathy — hydronephrosis or retention on imaging/bladder scan; delay can cause preventable graft damage.
Vascular compromise — abrupt severe dysfunction with abnormal Doppler flow; delay can threaten graft viability.

Board Question

A kidney-transplant recipient presents with fever, hypotension, and acute graft dysfunction. What is the best next step? -

AGive high-dose corticosteroids for presumed rejection -
BObtain cultures and promptly start empiric IV antibiotics while resuscitating -
CDelay antibiotics until transplant ultrasound is completed -
DDischarge if urine output improves after IV fluid

Reveal answer

Correct: B

Treat suspected sepsis promptly while evaluating graft dysfunction; cultures should be obtained first when feasible, but antibiotics must not be delayed in an unstable patient. Rejection treatment requires specialist evaluation and should not be presumed before urgent infection is addressed.

TheDaily Differential

Dialysis-Related Emergencies

When to Think of It

Sick or Not Sick

The First Fifteen Minutes

Definitive Care & Disposition

How This One Kills

The Second-Day Story

Study Directive

Recent Literature

More in Today's Issue

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Bleeding AV Shunt

Yesterday’s Differential

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Critical Care Corner

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Pharmacology Corner

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