Leukostasis and hyperleukocytosis - Revision history

Danbot: Strip excess bold

2026-03-22T09:34:50Z

Strip excess bold

Danbot: Expand with concise EM-focused content: CLL distinction, avoid RBC transfusion pearl, management algorithm

2026-03-21T01:20:48Z

Expand with concise EM-focused content: CLL distinction, avoid RBC transfusion pearl, management algorithm

← Older revision		Revision as of 01:20, 21 March 2026
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	==Background==		==Background==
	*Hyperleukocytosis ~~is lab abnormality of~~ WBC >50~~-100K~~		*'''Hyperleukocytosis:''' WBC >100,000/μL (some define as >50,000)
	*Blood viscosity increases		*'''Leukostasis:''' Symptomatic hyperleukocytosis — a hematologic emergency
	*Leukostasis ~~is symptomatic~~ hyperleukocytosis~~; it is~~ a ~~medical~~ emergency		**White cell plugs obstruct microvasculature → end-organ damage
	**Most commonly seen with [[AML]] or [[CML]] in blast crisis		**Most commonly seen with [[AML]] or [[CML]] in blast crisis (blast cells are larger and stickier than mature WBCs)
	**High blast ~~cell count > WBC plugs in microvasculature~~		**Brain and lungs are most commonly affected organs
	***Brain and ~~lung~~ are most commonly affected		*20-40% of patients with leukostasis die within first week of presentation
	*20-40% of patients with leukostasis die within ~~1st~~ week of presentation		*'''Key distinction:''' WBC count alone does not predict leukostasis — CLL patients may have WBC >200K without leukostasis because mature lymphocytes are small and deformable

	==Clinical Features==		==Clinical Features==
	*[[Fever]]		*'''Fever''' — present in ~80%; may be from leukostasis-related inflammation or concurrent infection
	**80% ~~of patients~~		*'''CNS leukostasis:''' [[headache]], [[dizziness]], [[tinnitus]], visual disturbances, [[confusion]], [[ataxia]], stupor, [[coma]], [[intracranial hemorrhage]]
	**May be ~~due to~~ inflammation ~~associated with leukostasis~~ or concurrent infection		*'''Pulmonary leukostasis:''' [[Respiratory distress]], [[hypoxemia]], [[respiratory failure]]
	*~~Brain Leukostasis~~		**'''Pearl:''' ABG may show falsely decreased PaO2 (leukocytes consume O2 in vitro); pulse oximetry is more accurate
	**[[~~Headache~~]]		*'''Other:''' Priapism, renal insufficiency, limb ischemia, [[DIC]]
	**[[~~Dizziness~~]]
	**[[~~Tinnitus~~]]
	**[[~~Visual disturbances~~]]
	**[[~~Ataxia~~]]
	**[[~~Confusion~~]]
	**Stupor
	**[[~~Coma~~]]
	**Sudden death
	*Pulmonary ~~Leukostasis~~
	**[[Respiratory distress]]
	**[[~~Hypoxemia~~]]
	***[[ABG]] may show falsely decreased PaO2; pulse oximetry is more accurate
	**[[~~Respiratory failure~~]]

	==Differential Diagnosis==		==Differential Diagnosis==
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	==Evaluation==		==Evaluation==
	~~===Work-Up===~~		*CBC with differential and peripheral smear
	*CBC		*DIC labs: PT/INR, PTT, fibrinogen, D-dimer, FDP (DIC in up to 40%)
	*DIC labs		*[[Tumor lysis syndrome]] labs: BMP (potassium, calcium, phosphate), uric acid, LDH (TLS in up to 10%)
	**[[DIC~~]] occurs~~ in up to 40% ~~of patients~~		*[[CXR]]: interstitial or alveolar infiltrates
	**FDP, d-dimer, fibrinogen, coags		*CT head if CNS symptoms (hemorrhage or infarction)
	*[[Tumor ~~Lysis Syndrome~~]] labs		*Blood and urine cultures if febrile
	**TLS ~~occurs~~ in up to 10% ~~of patients~~		*'''Avoid transfusing RBCs''' before cytoreduction — may worsen viscosity and leukostasis symptoms
	**Chemistry
	**Uric acid
	**Calcium
	**Phosphate

	~~===Evaluation===~~
	*High degree of suspicion needed to make the diagnosis
	*WBC count usually >100K; can have symptoms with WBC as low as 50K
	*[[CXR]]
	**~~Interstial or alveolar infiltrates~~

	==Management==		==Management==
	*Hyperleukocytosis (asymptomatic)		*'''Hyperleukocytosis (asymptomatic):''' [[Hydroxyurea]] for cytoreduction may suffice
	**[[Hydroxyurea]] may ~~be all that is required~~		*'''Leukostasis (symptomatic):'''
	*Leukostasis		**Aggressive IV hydration — prevent dehydration which worsens viscosity
	**IV hydration		**'''Chemotherapy''' — only treatment proven to improve survival; hematology consult immediately
	***Prevent dehydration which ~~can worsen condition~~		**'''Hydroxyurea''' 50-100 mg/kg/day for urgent cytoreduction while awaiting chemotherapy
	**Chemotherapy		**'''Leukapheresis''' — temporizing measure to rapidly reduce WBC count; use if chemotherapy will be delayed
	***Only treatment proven to improve survival		*TLS prophylaxis: [[Allopurinol]] or [[rasburicase]], aggressive IV hydration
	**[[Hydroxyurea~~]] + leukapheresis~~		*Broad-spectrum [[antibiotics]] — leading cause of death in blast crisis is infection (patients are functionally [[neutropenia\|neutropenic]])
	***Can be use ~~for cytoreduction~~ if ~~chemo~~ will be delayed		*'''Do NOT transfuse RBCs''' to Hgb >10 until WBC is reduced (increases viscosity)
	*[[Allopurinol]] ~~may help prevent [[Tumor lysis syndrome]]~~
	*Consider [[rasburicase]]
	*Broad spectrum [[antibiotics]]
	**The leading cause of death in blast crisis is infection (patients are functionally [[neutropenia\|neutropenic]])

	==Disposition==		==Disposition==
	*Admit to ICU		*Admit to ICU for symptomatic leukostasis
			*Immediate hematology/oncology consult for all cases

			==See Also==
			*[[Tumor lysis syndrome]]
			*[[Neutropenic fever]]
			*[[DIC]]

	==References==		==References==
	<references/>		<references/>

	[[Category:Heme/Onc]]		[[Category:Heme/Onc]]

Elcatracho: /* Management */

2022-01-11T02:32:11Z

Management

← Older revision		Revision as of 02:32, 11 January 2022
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	*Consider [[rasburicase]]		*Consider [[rasburicase]]
	*Broad spectrum [[antibiotics]]		*Broad spectrum [[antibiotics]]
	**The leading cause of death in blast crisis is infection (patients are functionally neutropenic)		**The leading cause of death in blast crisis is infection (patients are functionally [[neutropenia\|neutropenic]])

	==Disposition==		==Disposition==

ClaireLewis: /* Clinical Features */

2019-08-31T00:56:41Z

Clinical Features

← Older revision		Revision as of 00:56, 31 August 2019
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	**[[Dizziness]]		**[[Dizziness]]
	**[[Tinnitus]]		**[[Tinnitus]]
	**Visual disturbances		**[[Visual disturbances]]
	**[[Ataxia]]		**[[Ataxia]]
	**Confusion		**[[Confusion]]
	**Stupor		**Stupor
	**Coma		**[[Coma]]
	**Sudden death		**Sudden death
	*Pulmonary Leukostasis		*Pulmonary Leukostasis
	**Respiratory distress		**[[Respiratory distress]]
	**[[Hypoxemia]]		**[[Hypoxemia]]
	***[[ABG]] may show falsely decreased PaO2; pulse oximetry is more accurate		***[[ABG]] may show falsely decreased PaO2; pulse oximetry is more accurate
	**Respiratory failure		**[[Respiratory failure]]

	==Differential Diagnosis==		==Differential Diagnosis==

ClaireLewis: /* Management */

2019-05-27T21:28:21Z

Management

← Older revision		Revision as of 21:28, 27 May 2019
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	==Management==		==Management==
	*Hyperleukocytosis (asymptomatic)		*Hyperleukocytosis (asymptomatic)
	**~~Hydoxyurea~~ may be all that is required		**[[Hydroxyurea]] may be all that is required
	*Leukostasis		*Leukostasis
	**IV hydration		**IV hydration
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	**Chemotherapy		**Chemotherapy
	***Only treatment proven to improve survival		***Only treatment proven to improve survival
	**Hydroxyurea + leukapheresis		**[[Hydroxyurea]] + leukapheresis
	***Can be use for cytoreduction if chemo will be delayed		***Can be use for cytoreduction if chemo will be delayed
	*[[Allopurinol]] may help prevent [[Tumor lysis syndrome]]		*[[Allopurinol]] may help prevent [[Tumor lysis syndrome]]
	*Consider rasburicase		*Consider [[rasburicase]]
	*Broad spectrum antibiotics		*Broad spectrum [[antibiotics]]
	**The leading cause of death in blast crisis is infection (patients are functionally neutropenic)		**The leading cause of death in blast crisis is infection (patients are functionally neutropenic)

Beren85: /* Management */

2019-04-14T21:53:08Z

Management

← Older revision		Revision as of 21:53, 14 April 2019
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	***Can be use for cytoreduction if chemo will be delayed		***Can be use for cytoreduction if chemo will be delayed
	*[[Allopurinol]] may help prevent [[Tumor lysis syndrome]]		*[[Allopurinol]] may help prevent [[Tumor lysis syndrome]]
			*Consider rasburicase
			*Broad spectrum antibiotics
			**The leading cause of death in blast crisis is infection (patients are functionally neutropenic)

	==Disposition==		==Disposition==

Mholtz: Text replacement - "==Treatment==" to "==Management=="

2017-12-10T23:31:33Z

Text replacement - "==Treatment==" to "==Management=="

← Older revision		Revision as of 23:31, 10 December 2017
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	**Interstial or alveolar infiltrates		**Interstial or alveolar infiltrates

	==~~Treatment~~==		==Management==
	*Hyperleukocytosis (asymptomatic)		*Hyperleukocytosis (asymptomatic)
	**Hydoxyurea may be all that is required		**Hydoxyurea may be all that is required

Lisayee25: /* Work-Up */

2017-09-28T03:45:58Z

Work-Up

← Older revision		Revision as of 03:45, 28 September 2017
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	**[[DIC]] occurs in up to 40% of patients		**[[DIC]] occurs in up to 40% of patients
	**FDP, d-dimer, fibrinogen, coags		**FDP, d-dimer, fibrinogen, coags
	*Tumor Lysis Syndrome labs		*[[Tumor Lysis Syndrome]] labs
	**TLS occurs in up to 10% of patients		**TLS occurs in up to 10% of patients
	**Chemistry		**Chemistry

Mholtz: Text replacement - "==References== " to "==References== "

2017-07-24T01:12:18Z

Text replacement - "==References== " to "==References== <references/> "

← Older revision		Revision as of 01:12, 24 July 2017
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	==References==		==References==
			<references/>
	[[Category:Heme/Onc]]		[[Category:Heme/Onc]]

ClaireLewis: /* Background */

2016-12-11T01:04:38Z

Background

← Older revision		Revision as of 01:04, 11 December 2016
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	*Blood viscosity increases		*Blood viscosity increases
	*Leukostasis is symptomatic hyperleukocytosis; it is a medical emergency		*Leukostasis is symptomatic hyperleukocytosis; it is a medical emergency
	**Most commonly seen with [[AML]] or [[CML]] in ~~[[Blast~~ crisis]]		**Most commonly seen with [[AML]] or [[CML]] in blast crisis
	**High blast cell count > WBC plugs in microvasculature		**High blast cell count > WBC plugs in microvasculature
	***Brain and lung are most commonly affected		***Brain and lung are most commonly affected

← Older revision		Revision as of 09:34, 22 March 2026
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	==Background==		==Background==
	*~~'''~~Hyperleukocytosis:~~'''~~ WBC >100,000/μL (some define as >50,000)		*Hyperleukocytosis: WBC >100,000/μL (some define as >50,000)
	*'''Leukostasis:''' Symptomatic hyperleukocytosis — a hematologic emergency		*'''Leukostasis:''' Symptomatic hyperleukocytosis — a hematologic emergency
	**White cell plugs obstruct microvasculature → end-organ damage		**White cell plugs obstruct microvasculature → end-organ damage
Line 6:		Line 6:
	**Brain and lungs are most commonly affected organs		**Brain and lungs are most commonly affected organs
	*20-40% of patients with leukostasis die within first week of presentation		*20-40% of patients with leukostasis die within first week of presentation
	*~~'''~~Key distinction:~~'''~~ WBC count alone does not predict leukostasis — CLL patients may have WBC >200K without leukostasis because mature lymphocytes are small and deformable		*Key distinction: WBC count alone does not predict leukostasis — CLL patients may have WBC >200K without leukostasis because mature lymphocytes are small and deformable

	==Clinical Features==		==Clinical Features==
	*~~'''~~Fever~~'''~~ — present in ~80%; may be from leukostasis-related inflammation or concurrent infection		*Fever — present in ~80%; may be from leukostasis-related inflammation or concurrent infection
	*~~'''~~CNS leukostasis:~~'''~~ [[headache]], [[dizziness]], [[tinnitus]], visual disturbances, [[confusion]], [[ataxia]], stupor, [[coma]], [[intracranial hemorrhage]]		*CNS leukostasis: [[headache]], [[dizziness]], [[tinnitus]], visual disturbances, [[confusion]], [[ataxia]], stupor, [[coma]], [[intracranial hemorrhage]]
	*~~'''~~Pulmonary leukostasis:~~'''~~ [[Respiratory distress]], [[hypoxemia]], [[respiratory failure]]		*Pulmonary leukostasis: [[Respiratory distress]], [[hypoxemia]], [[respiratory failure]]
	**~~'''~~Pearl:~~'''~~ ABG may show falsely decreased PaO2 (leukocytes consume O2 in vitro); pulse oximetry is more accurate		**Pearl: ABG may show falsely decreased PaO2 (leukocytes consume O2 in vitro); pulse oximetry is more accurate
	*~~'''~~Other:~~'''~~ Priapism, renal insufficiency, limb ischemia, [[DIC]]		*Other: Priapism, renal insufficiency, limb ischemia, [[DIC]]

	==Differential Diagnosis==		==Differential Diagnosis==
Line 25:		Line 25:
	*CT head if CNS symptoms (hemorrhage or infarction)		*CT head if CNS symptoms (hemorrhage or infarction)
	*Blood and urine cultures if febrile		*Blood and urine cultures if febrile
	*~~'''~~Avoid transfusing RBCs~~'''~~ before cytoreduction — may worsen viscosity and leukostasis symptoms		*Avoid transfusing RBCs before cytoreduction — may worsen viscosity and leukostasis symptoms

	==Management==		==Management==
	*~~'''~~Hyperleukocytosis (asymptomatic):~~'''~~ [[Hydroxyurea]] for cytoreduction may suffice		*Hyperleukocytosis (asymptomatic): [[Hydroxyurea]] for cytoreduction may suffice
	*~~'''~~Leukostasis (symptomatic):~~'''~~		*Leukostasis (symptomatic):
	**Aggressive IV hydration — prevent dehydration which worsens viscosity		**Aggressive IV hydration — prevent dehydration which worsens viscosity
	**'''Chemotherapy''' — only treatment proven to improve survival; hematology consult immediately		**'''Chemotherapy''' — only treatment proven to improve survival; hematology consult immediately
	**~~'''~~Hydroxyurea~~'''~~ 50-100 mg/kg/day for urgent cytoreduction while awaiting chemotherapy		**Hydroxyurea 50-100 mg/kg/day for urgent cytoreduction while awaiting chemotherapy
	**~~'''~~Leukapheresis~~'''~~ — temporizing measure to rapidly reduce WBC count; use if chemotherapy will be delayed		**Leukapheresis — temporizing measure to rapidly reduce WBC count; use if chemotherapy will be delayed
	*TLS prophylaxis: [[Allopurinol]] or [[rasburicase]], aggressive IV hydration		*TLS prophylaxis: [[Allopurinol]] or [[rasburicase]], aggressive IV hydration
	*Broad-spectrum [[antibiotics]] — leading cause of death in blast crisis is infection (patients are functionally [[neutropenia\|neutropenic]])		*Broad-spectrum [[antibiotics]] — leading cause of death in blast crisis is infection (patients are functionally [[neutropenia\|neutropenic]])