ICU Map

Neutropenic & Immunocompromised Sepsis

Immediate 1-hour empiric antipseudomonal therapy, host-specific diagnostic pathway, and oncologic emergency escalation.

RecognizeAssessDecideDifferentialInterveneReassess
Immunocompromised Patient with Fever, Shock, or Organ Failure
Assessment StepTrigger: Fever >= 38.3°C, Shock, or Organ Failure in Neutropenic or Oncology PatientExplore Topic
Draw 2 sets of blood cultures (peripheral + CVC lumens) and serum lactate immediately.
Clinical ActionAdminister Empiric Antipseudomonal Beta-Lactam within 60 Minutes
Use an appropriate empiric antipseudomonal beta-lactam (e.g., cefepime, piperacillin-tazobactam or meropenem) selected for local resistance risk and source. Give a full initial dose promptly, then adjust maintenance dosing for kidney function/RRT and optimize beta-lactam exposure (prolonged infusion/TDM where appropriate). Add MRSA-active therapy only when clinically indicated (e.g., shock with relevant risk, catheter/skin infection, pneumonia or known colonization).
Assessment StepEvaluate Specific Organ Failure & Host Complications
Respiratory Failure vs Tumor Lysis Syndrome vs CAR-T Toxicity vs Fungal Infection.
Differential Branches (3)
1Branch
Clinical ActionAcute Respiratory Failure: HRCT Chest within 24h + Early BAL (PJP / Aspergillus / DAH)
Trial HFNC/NIV with a low threshold for intubation when noninvasive support is failing (HIGH trial context). Treat suspected/confirmed PJP with TMP-SMX adjusted to host and renal function; adjunctive corticosteroids are evidence-based for moderate-to-severe HIV-associated PCP but should not be applied automatically to HIV-negative PJP. Use syndrome-appropriate mold therapy for suspected invasive aspergillosis with ID input.
2Branch
Clinical ActionTumor Lysis Syndrome: Vigorous IV Hydration + Rasburicase 0.2 mg/kg + CRRT
Rasburicase contraindicated in G6PD; CRRT for refractory hyperkalemia and hyperphosphatemia.
3Branch
Clinical ActionPost-CAR-T Toxicity: Tocilizumab 8 mg/kg for CRS vs Dexamethasone for ICANS
Grade with ASTCT criteria; avoid tocilizumab for isolated ICANS neurotoxicity.

An educational representation of clinical reasoning, not a diagnostic algorithm or personalized medical advice — always apply clinical judgment and institutional protocols.

Caution

Escalate — Red Flags & Critical Warnings

  • Rasburicase in G6PD deficiency triggers fatal methemoglobinemia and massive intravascular hemolysis.
  • In hyperleukocytosis/leukostasis, unnecessary RBC transfusion before cytoreduction can increase blood viscosity and worsen microvascular symptoms. Avoid reflex transfusion, but do not withhold lifesaving RBCs for major hemorrhage or critical symptomatic anemia; coordinate with hematology.

Related Bedside Clinical Problems (21)

Bedside Presentations
Sudden Hypoxemia

Bedside triage of acute desaturation: signal verification, immediate danger screening (DOPE / tension pneumothorax), oxygen escalation ladder, and mechanism-based differential.

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Sudden Ventilator Deterioration & High Airway Pressures

Algorithmic troubleshooting of acute patient-ventilator collapse: the DOPE framework, peak vs plateau pressure differentiation, auto-PEEP evaluation, and manual bagging separation.

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Acute Severe Respiratory Distress

Bedside management of the gasping, tachypneic patient: work-of-breathing assessment, accessory muscle use, P-SILI prevention, and timely intubation vs noninvasive support.

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Linked Deep-Dive Topics (7)

Reference Knowledge
Immunocompromised & Oncologic Critical Illnessinfectious-disease

Host immune defects, neutropenic sepsis, acute respiratory failure (PJP/Aspergillus), tumor lysis syndrome, leukostasis, CAR-T CRS/ICANS, and ICU triage.

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Sepsisinfectious-disease

Life-threatening organ dysfunction caused by a dysregulated host response to infection — recognized by an acute rise in SOFA score, not by infection plus fever alone.

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Hospital-Acquired Pneumonia (HAP)infectious-disease

Nosocomial pneumonia developing ≥ 48 hours after admission in non-ventilated patients, host and antibiogram MDR risk tailoring, nasal MRSA PCR screening, and 7-day de-escalation.

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Acute Respiratory Distress Syndromerespiratory

Acute, diffuse inflammatory lung injury causing hypoxemia and bilateral infiltrates not fully explained by cardiac failure or fluid overload.

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Acute Kidney Injury in Critical Carerenal

Sepsis-AKI microcirculatory decoupling, KDIGO staging, Furosemide Stress Test (FST), urine microscopy, and the AEIOU dialysis threshold framework.

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Continuous Renal Replacement Therapy (CRRT)renal

Principles of convection vs diffusion, filtration fraction, delivered effluent dosing (20–25 mL/kg/h), Regional Citrate Anticoagulation, and citrate toxicity.

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Severe Hyperkalemia in Critical Illnessrenal

Nernst resting potential mechanics, ECG progression, the 3-step resuscitation framework (Stabilize, Shift, Eliminate), and post-dialysis rebound kinetics.

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