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According to the IDSA Practice Guideline, neutropenia is defined as an absolute neutrophil count (ANC) of <500 cells/mm<sup>3</sup> or an ANC that is expected to decrease to <500 cells/mm<sup>3</sup> during the next 48 hours, and fever is defined as a single oral temperature measurement of ≥38.3°C (101°F) or a temperature of ≥38.0°C (100.4°F) sustained over a 1-hour period. | According to the IDSA Practice Guideline, neutropenia is defined as an absolute neutrophil count (ANC) of <500 cells/mm<sup>3</sup> or an ANC that is expected to decrease to <500 cells/mm<sup>3</sup> during the next 48 hours, and fever is defined as a single oral temperature measurement of ≥38.3°C (101°F) or a temperature of ≥38.0°C (100.4°F) sustained over a 1-hour period. | ||
== Diagnostic Criteria == | |||
The definitions of [[fever]] and [[neutropenia]] are used to identify patients in whom empirical antibiotic therapy must be initiated. However, neutropenic patients represent a heterogeneous population and treatment may be considered even when they do not meet these specific criteria. Clinical judgment based on parameters in risk assessment also plays a critical role in tailoring the management. | The definitions of [[fever]] and [[neutropenia]] are used to identify patients in whom empirical antibiotic therapy must be initiated. However, neutropenic patients represent a heterogeneous population and treatment may be considered even when they do not meet these specific criteria. Clinical judgment based on parameters in risk assessment also plays a critical role in tailoring the management. | ||
=== Fever === | |||
Fever is defined as a single oral temperature measurement of ≥38.3°C (101°F) or a temperature of ≥38.0°C (100.4°F) sustained over a 1-hour period.<ref>{{Cite journal | doi = 10.1093/cid/ciq147 | issn = 1537-6591 | volume = 52 | issue = 4 | pages = 427–431 | last = Freifeld | first = Alison G. | coauthors = Eric J. Bow, Kent A. Sepkowitz, Michael J. Boeckh, James I. Ito, Craig A. Mullen, Issam I. Raad, Kenneth V. Rolston, Jo-Anne H. Young, John R. Wingard, null Infectious Diseases Society of Americaa | title = Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America | journal = Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America | date = 2011-02-15 | pmid = 21205990 }}</ref> | Fever is defined as a single oral temperature measurement of ≥38.3°C (101°F) or a temperature of ≥38.0°C (100.4°F) sustained over a 1-hour period.<ref>{{Cite journal | doi = 10.1093/cid/ciq147 | issn = 1537-6591 | volume = 52 | issue = 4 | pages = 427–431 | last = Freifeld | first = Alison G. | coauthors = Eric J. Bow, Kent A. Sepkowitz, Michael J. Boeckh, James I. Ito, Craig A. Mullen, Issam I. Raad, Kenneth V. Rolston, Jo-Anne H. Young, John R. Wingard, null Infectious Diseases Society of Americaa | title = Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America | journal = Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America | date = 2011-02-15 | pmid = 21205990 }}</ref> | ||
=== Neutropenia === | |||
Neutropenia is defined as an absolute neutrophil count (ANC) of <500 cells/mm<sup>3</sup> or an ANC that is expected to decrease to <500 cells/mm<sup>3</sup> during the next 48 hours.<ref>{{Cite journal | doi = 10.1093/cid/ciq147 | issn = 1537-6591 | volume = 52 | issue = 4 | pages = 427–431 | last = Freifeld | first = Alison G. | coauthors = Eric J. Bow, Kent A. Sepkowitz, Michael J. Boeckh, James I. Ito, Craig A. Mullen, Issam I. Raad, Kenneth V. Rolston, Jo-Anne H. Young, John R. Wingard, null Infectious Diseases Society of Americaa | title = Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America | journal = Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America | date = 2011-02-15 | pmid = 21205990 }}</ref> | Neutropenia is defined as an absolute neutrophil count (ANC) of <500 cells/mm<sup>3</sup> or an ANC that is expected to decrease to <500 cells/mm<sup>3</sup> during the next 48 hours.<ref>{{Cite journal | doi = 10.1093/cid/ciq147 | issn = 1537-6591 | volume = 52 | issue = 4 | pages = 427–431 | last = Freifeld | first = Alison G. | coauthors = Eric J. Bow, Kent A. Sepkowitz, Michael J. Boeckh, James I. Ito, Craig A. Mullen, Issam I. Raad, Kenneth V. Rolston, Jo-Anne H. Young, John R. Wingard, null Infectious Diseases Society of Americaa | title = Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America | journal = Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America | date = 2011-02-15 | pmid = 21205990 }}</ref> | ||
=== Profound neutropenia === | |||
Neutropenia in which the ANC is <100 cells/mm<sup>3</sup>; a manual reading of the blood smear is required to confirm this degree of neutropenia.<ref>{{Cite journal | doi = 10.1093/cid/ciq147 | issn = 1537-6591 | volume = 52 | issue = 4 | pages = 427–431 | last = Freifeld | first = Alison G. | coauthors = Eric J. Bow, Kent A. Sepkowitz, Michael J. Boeckh, James I. Ito, Craig A. Mullen, Issam I. Raad, Kenneth V. Rolston, Jo-Anne H. Young, John R. Wingard, null Infectious Diseases Society of Americaa | title = Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America | journal = Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America | date = 2011-02-15 | pmid = 21205990 }}</ref> | Neutropenia in which the ANC is <100 cells/mm<sup>3</sup>; a manual reading of the blood smear is required to confirm this degree of neutropenia.<ref>{{Cite journal | doi = 10.1093/cid/ciq147 | issn = 1537-6591 | volume = 52 | issue = 4 | pages = 427–431 | last = Freifeld | first = Alison G. | coauthors = Eric J. Bow, Kent A. Sepkowitz, Michael J. Boeckh, James I. Ito, Craig A. Mullen, Issam I. Raad, Kenneth V. Rolston, Jo-Anne H. Young, John R. Wingard, null Infectious Diseases Society of Americaa | title = Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America | journal = Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America | date = 2011-02-15 | pmid = 21205990 }}</ref> | ||
=== Functional neutropenia === | |||
Functional neutropenia refers to patients whose hematologic malignancy results in qualitative defects (impaired [[phagocytosis]] and killing of pathogens) of circulating neutrophils. These patients should also be considered to be at increased risk for infection, despite a normal neutrophil count.<ref>{{Cite journal | doi = 10.1093/cid/ciq147 | issn = 1537-6591 | volume = 52 | issue = 4 | pages = 427–431 | last = Freifeld | first = Alison G. | coauthors = Eric J. Bow, Kent A. Sepkowitz, Michael J. Boeckh, James I. Ito, Craig A. Mullen, Issam I. Raad, Kenneth V. Rolston, Jo-Anne H. Young, John R. Wingard, null Infectious Diseases Society of Americaa | title = Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America | journal = Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America | date = 2011-02-15 | pmid = 21205990 }}</ref> | Functional neutropenia refers to patients whose hematologic malignancy results in qualitative defects (impaired [[phagocytosis]] and killing of pathogens) of circulating neutrophils. These patients should also be considered to be at increased risk for infection, despite a normal neutrophil count.<ref>{{Cite journal | doi = 10.1093/cid/ciq147 | issn = 1537-6591 | volume = 52 | issue = 4 | pages = 427–431 | last = Freifeld | first = Alison G. | coauthors = Eric J. Bow, Kent A. Sepkowitz, Michael J. Boeckh, James I. Ito, Craig A. Mullen, Issam I. Raad, Kenneth V. Rolston, Jo-Anne H. Young, John R. Wingard, null Infectious Diseases Society of Americaa | title = Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America | journal = Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America | date = 2011-02-15 | pmid = 21205990 }}</ref> | ||
=== Microbiologically defined infection === | |||
This can include both | This can include both | ||
# bacteremia, either with a single organism or polymicrobial infection, but without a definable nonhematogenous site of infection, and | # bacteremia, either with a single organism or polymicrobial infection, but without a definable nonhematogenous site of infection, and | ||
# a microbiologically defined site of infection (e.g., pneumonia, cellulitis) with or without concomitant bacteremia.<ref>{{Cite journal | issn = 0022-1899 | volume = 161 | issue = 3 | pages = 397–401 | title = From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel | journal = The Journal of Infectious Diseases | date = 1990-03 | pmid = 2179421 }}</ref> | # a microbiologically defined site of infection (e.g., pneumonia, cellulitis) with or without concomitant bacteremia.<ref>{{Cite journal | issn = 0022-1899 | volume = 161 | issue = 3 | pages = 397–401 | title = From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel | journal = The Journal of Infectious Diseases | date = 1990-03 | pmid = 2179421 }}</ref> | ||
=== Clinically defined infection === | |||
This is designated when a site of infection is diagnosed (e.g., pneumonia,cellulitis) but its microbiologic pathogenesis either cannot be proven or is inaccessible to examination.<ref>{{Cite journal | issn = 0022-1899 | volume = 161 | issue = 3 | pages = 397–401 | title = From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel | journal = The Journal of Infectious Diseases | date = 1990-03 | pmid = 2179421 }}</ref> | This is designated when a site of infection is diagnosed (e.g., pneumonia,cellulitis) but its microbiologic pathogenesis either cannot be proven or is inaccessible to examination.<ref>{{Cite journal | issn = 0022-1899 | volume = 161 | issue = 3 | pages = 397–401 | title = From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel | journal = The Journal of Infectious Diseases | date = 1990-03 | pmid = 2179421 }}</ref> | ||
=== Unexplained fever === | |||
In the neutropenic patient, this is defined as a new fever that is not accompanied by either clinical or microbiologic evidence of infection.<ref>{{Cite journal | issn = 0022-1899 | volume = 161 | issue = 3 | pages = 397–401 | title = From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel | journal = The Journal of Infectious Diseases | date = 1990-03 | pmid = 2179421 }}</ref> | In the neutropenic patient, this is defined as a new fever that is not accompanied by either clinical or microbiologic evidence of infection.<ref>{{Cite journal | issn = 0022-1899 | volume = 161 | issue = 3 | pages = 397–401 | title = From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel | journal = The Journal of Infectious Diseases | date = 1990-03 | pmid = 2179421 }}</ref> | ||
==References== | == References == | ||
{{reflist|2}} | {{reflist|2}} | ||
[[Category:Emergency medicine]] | [[Category:Emergency medicine]] | ||
Latest revision as of 21:43, 29 July 2020
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Synonyms and keywords: F and N; fever and neutropenia; FN; hot and low; hot leuk; neutropenic fever; neutropenic fever syndrome; neutropenic sepsis
Overview
According to the IDSA Practice Guideline, neutropenia is defined as an absolute neutrophil count (ANC) of <500 cells/mm3 or an ANC that is expected to decrease to <500 cells/mm3 during the next 48 hours, and fever is defined as a single oral temperature measurement of ≥38.3°C (101°F) or a temperature of ≥38.0°C (100.4°F) sustained over a 1-hour period.
Diagnostic Criteria
The definitions of fever and neutropenia are used to identify patients in whom empirical antibiotic therapy must be initiated. However, neutropenic patients represent a heterogeneous population and treatment may be considered even when they do not meet these specific criteria. Clinical judgment based on parameters in risk assessment also plays a critical role in tailoring the management.
Fever
Fever is defined as a single oral temperature measurement of ≥38.3°C (101°F) or a temperature of ≥38.0°C (100.4°F) sustained over a 1-hour period.[1]
Neutropenia
Neutropenia is defined as an absolute neutrophil count (ANC) of <500 cells/mm3 or an ANC that is expected to decrease to <500 cells/mm3 during the next 48 hours.[2]
Profound neutropenia
Neutropenia in which the ANC is <100 cells/mm3; a manual reading of the blood smear is required to confirm this degree of neutropenia.[3]
Functional neutropenia
Functional neutropenia refers to patients whose hematologic malignancy results in qualitative defects (impaired phagocytosis and killing of pathogens) of circulating neutrophils. These patients should also be considered to be at increased risk for infection, despite a normal neutrophil count.[4]
Microbiologically defined infection
This can include both
- bacteremia, either with a single organism or polymicrobial infection, but without a definable nonhematogenous site of infection, and
- a microbiologically defined site of infection (e.g., pneumonia, cellulitis) with or without concomitant bacteremia.[5]
Clinically defined infection
This is designated when a site of infection is diagnosed (e.g., pneumonia,cellulitis) but its microbiologic pathogenesis either cannot be proven or is inaccessible to examination.[6]
Unexplained fever
In the neutropenic patient, this is defined as a new fever that is not accompanied by either clinical or microbiologic evidence of infection.[7]
References
- ↑ Freifeld, Alison G. (2011-02-15). "Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America". Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America. 52 (4): 427–431. doi:10.1093/cid/ciq147. ISSN 1537-6591. PMID 21205990. Unknown parameter
|coauthors=ignored (help) - ↑ Freifeld, Alison G. (2011-02-15). "Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America". Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America. 52 (4): 427–431. doi:10.1093/cid/ciq147. ISSN 1537-6591. PMID 21205990. Unknown parameter
|coauthors=ignored (help) - ↑ Freifeld, Alison G. (2011-02-15). "Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America". Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America. 52 (4): 427–431. doi:10.1093/cid/ciq147. ISSN 1537-6591. PMID 21205990. Unknown parameter
|coauthors=ignored (help) - ↑ Freifeld, Alison G. (2011-02-15). "Clinical practice guideline for the use of antimicrobial agents in neutropenic patients with cancer: 2010 Update by the Infectious Diseases Society of America". Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America. 52 (4): 427–431. doi:10.1093/cid/ciq147. ISSN 1537-6591. PMID 21205990. Unknown parameter
|coauthors=ignored (help) - ↑ "From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel". The Journal of Infectious Diseases. 161 (3): 397–401. 1990-03. ISSN 0022-1899. PMID 2179421. Check date values in:
|date=(help) - ↑ "From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel". The Journal of Infectious Diseases. 161 (3): 397–401. 1990-03. ISSN 0022-1899. PMID 2179421. Check date values in:
|date=(help) - ↑ "From the Immunocompromised Host Society. The design, analysis, and reporting of clinical trials on the empirical antibiotic management of the neutropenic patient. Report of a consensus panel". The Journal of Infectious Diseases. 161 (3): 397–401. 1990-03. ISSN 0022-1899. PMID 2179421. Check date values in:
|date=(help)