The Intern At Work: Internal Medicine 256. Snowmageddon - An approach to Leukostasis
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Oct 28, 2024 A clinical deep dive into leukostasis using a memorable snowstorm analogy. Physiology of blast-driven microvascular obstruction is broken down into simple parts. Classic organ presentations and focused exam priorities are highlighted. Practical investigation pitfalls and urgent management steps are reviewed, including cytoreduction, tumor lysis caution, and transfusion guidance.
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Blasts Cause Mechanical Microvascular Obstruction
- Leukostasis is mechanical microvascular obstruction from large circulating blasts that impair tissue oxygen delivery.
- Blasts can be up to ~20 μm versus 7–8 μm RBCs and adhere to endothelium, increasing viscosity and hypoxia.
Differentiate Hyperleukocytosis From Leukostasis
- Hyperleukocytosis is a lab finding (WBC >100×10^9/L) whereas leukostasis is symptomatic end-organ damage from circulating blasts.
- Leukostasis = symptomatic hyperleukocytosis requiring clinical judgment beyond the CBC.
Actively Look For Brain And Lung Signs
- Assess for CNS and respiratory involvement with focused neurologic exam and AB C's, and monitor in ICU or step-down if unstable.
- Look for headache, visual changes, somnolence, dyspnea, hypoxia, crackles, and altered mental status.