Chronic idiopathic neutrophilia: experience and recommendations.

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Chronic idiopathic neutrophilia: experience and recommendations.

South Med J. 2011 Jul;104(7):499-504

Authors: Weir AB, Lewis JB, Arteta-Bulos R

OBJECTIVES: : To distinguish chronic idiopathic neutrophilia (CIN) in a cost-effective manner from neutrophilia caused by important underlying illnesses.
METHODS: : This was a retrospective review of patients visiting a Veterans Affairs Medical Center over the last 10 years with a diagnosis of leukocytosis or myeloproliferative disorder. Of this group, fifty-seven patients from 1999 to 2008 were identified with CIN. Clinical and laboratory parameters were examined to identify CIN and establish its course. Eighty-one patients who presented from 2005 to 2010 with myeloproliferative disorders were also studied at time of diagnosis to determine any possible confusion with CIN.
RESULTS: : The patients with CIN were followed for a mean of ?7.3 years without progression to other serious disorders. Compared to non-CIN patients evaluated for neutrophilia, in multiple logistic regression analyses, smoking (P = .001) and increased BMI (P = .004) were significantly associated with CIN. No CIN patient developed a clinically apparent myeloproliferative disorder other than chronic myeloid leukemia (CML). Of the patients with myeloproliferative neoplasms reviewed at the time of their initial diagnosis, only CML occasionally presented with a picture consistent with CIN. For nonsmokers, the BMI of CIN patients was significantly higher than the average VA population (P < .001).
CONCLUSION: : Cigarette smoking and obesity are confirmed as factors associated with CIN and may be causative. CIN is unlikely to develop into a clinically recognizable myeloproliferative neoplasm other than CML. Cost-effective guidelines for the diagnostic evaluation of neutrophilia in otherwise healthy patients are presented.

PMID: 21886049 [PubMed - in process]

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