A 9-year-old kidney-transplant recipient arrives pale and quiet, clutching a half-empty water bottle. His mother says he has vomited twice, has had fewer wet diapers today, and “just isn’t acting like himself”; the medication list is folded inside a plastic sandwich bag. His temperature is 38.7°C, heart rate 142, and the next dose of his immunosuppressant is due in 20 minutes. The question is what must happen before the medication clock runs out.

— What’s your move? Read on.

Before you read
  • How do you protect the graft while resuscitating the child?
  • Which medications and infections require special attention in an immunosuppressed patient?

When to Think of It

Fever, hypotension, vomiting/diarrhea, oliguria, altered behavior, respiratory symptoms, abdominal pain over the graft, new edema, hypertension, or missed immunosuppressants in any transplant recipient should trigger a transplant-emergency pathway. Assume serious infection until proven otherwise; immunosuppression may blunt fever and leukocytosis.

Sick or Not Sick

The pivotal call is shock, threatened airway, altered mental status, or rapidly declining graft function versus physiologic stability. Shock or organ dysfunction mandates resuscitation and ICU-level consultation while diagnostic workup proceeds.

The First Fifteen Minutes

  • ABCs, cardiac monitoring, two IVs or IO access, bedside glucose, temperature, urine output, and immediate contact with the transplant center. Obtain CBC, CMP, magnesium, phosphorus, lactate, blood cultures, urinalysis/culture, drug levels when relevant, and viral testing without delaying treatment.
  • Hypoglycemia: dextrose 10% 5 mL/kg IV (0.5 g/kg; maximum commonly 250 mL), because glucose rapidly reverses neuroglycopenia. Recheck in 10–15 minutes; dosing varies by age and institutional protocol.
  • Suspected septic shock with poor perfusion: balanced crystalloid 10–20 mL/kg IV bolus, reassessing after each bolus, because it restores preload; use smaller aliquots if cardiac or renal dysfunction is present.
  • Persistent shock after fluid or concern for myocardial dysfunction: epinephrine infusion 0.05–0.3 mcg/kg/min IV, titrated to perfusion, because it provides inotropy and vasoconstriction. Norepinephrine 0.05–0.3 mcg/kg/min IV is reasonable when vasodilatory shock predominates; check institutional pediatric infusion guidance.
  • Suspected bacterial sepsis: ceftriaxone 75–100 mg/kg IV/IO once, maximum 2 g, plus vancomycin 15 mg/kg IV, because broad early coverage is essential; tailor to local resistance, renal function, allergies, and transplant-center guidance. If hospital-acquired infection, neutropenia, or severe immunosuppression is present, cefepime 50 mg/kg IV, maximum 2 g, or piperacillin-tazobactam 100 mg/kg of the piperacillin component IV, maximum 4.5 g, may be preferred.
  • Chronic steroid user with shock: hydrocortisone 2 mg/kg IV, maximum 100 mg, because stress-dose steroid restores catecholamine responsiveness; confirm the home regimen and involve the transplant team.
  • Do not independently stop, double, or substitute tacrolimus, cyclosporine, sirolimus, mycophenolate, or prednisone; obtain urgent transplant advice. Vomiting, diarrhea, AKI, and interacting drugs can make tacrolimus levels toxic.

Definitive Care & Disposition

Admit any ill or potentially infected transplant child, generally to a monitored bed or PICU if shock, respiratory failure, altered mental status, severe electrolyte abnormality, or rising creatinine is present. Ultrasound with Doppler evaluates graft perfusion, hydronephrosis, collections, and vascular complications; biopsy is usually specialist-directed for suspected rejection. Treat identified infection, obstruction, thrombosis, rejection, or drug toxicity with the transplant service. Avoid NSAIDs, nephrotoxins, and iodinated contrast unless the diagnostic benefit clearly outweighs risk.

How This One Kills

The lethal error is labeling oliguria, vomiting, or lethargy as a medication side effect and delaying sepsis treatment or graft imaging. Immunosuppression can make a child appear deceptively well until shock or graft loss is advanced.
The Differential — What Else Looks Like This
  • Acute rejection — rising creatinine, hypertension, graft tenderness, or reduced urine without a clear infectious source; confusing it with dehydration delays specialist therapy.
  • Calcineurin-inhibitor toxicity — tremor, hypertension, AKI, hyperkalemia, or neurologic symptoms with an elevated level; escalating immunosuppression worsens toxicity.
  • Graft obstruction or vascular compromise — abrupt oliguria/anuria and abnormal Doppler findings; delay can cause irreversible graft loss.
  • Ordinary viral gastroenteritis — may cause vomiting and poor intake but can produce dangerous tacrolimus level changes and dehydration in this population.

The Second-Day Story

An immunosuppressed child may have no fever, leukocytosis, or focal tenderness. A caregiver may report only fatigue, reduced interaction, poor intake, new hypertension, or fewer wet diapers. The reliable signals are trend changes—weight, creatinine, urine output, blood pressure, medication tolerance, and drug exposure—so compare with baseline and involve the transplant team early.
Back to Our Patient
Back to the 9-year-old kidney-transplant recipient: his fever, tachycardia, vomiting, and reduced urine output represent a high-risk presentation, so the team recognizes possible sepsis with threatened graft function rather than simple gastroenteritis. He is placed on monitors, receives IV access, cultures and labs, cautious balanced-crystalloid boluses with reassessment, and prompt broad-spectrum antibiotics; because perfusion remains poor, a vasoactive infusion and stress-dose hydrocortisone are considered while the transplant service is contacted. Doppler ultrasound shows preserved flow without obstruction, and cultures later grow urinary E. coli. He is admitted to the PICU, with immunosuppressant dosing adjusted by the transplant team and graft function monitored closely.
Patient Presentation to Attending
How you’d present this patient on the floor — tight, pertinent positives and negatives, no rambling
“This is a 9-year-old kidney-transplant recipient with fever, two episodes of vomiting, decreased urine output, and acute lethargy since this morning. He is febrile to 38.7°C, tachycardic at 142, pale, and has delayed capillary refill, without respiratory distress or focal peritoneal signs. His glucose is normal, but lactate is elevated and creatinine is above his baseline; cultures are pending. I’m concerned for sepsis with early graft dysfunction, while rejection, tacrolimus toxicity, and obstruction remain in the differential. I’ve obtained access and cultures, started cautious weight-based crystalloid with reassessment, given empiric broad-spectrum antibiotics, and called the transplant service; he needs PICU monitoring, vasoactive support if perfusion does not improve, and urgent graft Doppler imaging.”

Study Directive

  • Draw a transplant-emergency algorithm from memory: shock, infection, rejection, toxicity, obstruction, and vascular compromise.
  • Memorize empiric sepsis doses for ceftriaxone, vancomycin, cefepime, and hydrocortisone.
  • Review one institutional pediatric transplant guideline and identify its transplant-center contact process.
  • Practice calculating maintenance immunosuppressant timing, weight-based fluid boluses, and vasoactive infusion rates for a 20-kg child.
  • Complete three cases involving oliguria after transplant and state the next test, medication hazard, and disposition for each.