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Letter Role of the eosinophil count in discriminating the severity of community-acquired pneumonia in HIV-infected patientsRafel Perelló1 1 Emergency Department, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques Agustí Pi i Sunyer, University of Barcelona, Villarroel 170, 08036 Barcelona, Catalonia, Spain 2 Infectious Diseases Service, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques Agustí Pi i Sunyer, University of Barcelona, Villarroel 170, 08036 Barcelona, Catalonia, Spain
Critical Care 2008, 12:425doi:10.1186/cc6971 See related research by Abidi et al., http://ccforum.com/content/12/2/R59 The electronic version of this article is the complete one and can be found online at: http://ccforum.com/content/12/4/425
© 2008 BioMed Central Ltd LetterAbidi and colleagues recently reported that eosinopenia constitutes a good diagnostic marker in distinguishing between noninfection and infection, but is a moderate marker in discriminating between systemic inflammatory response syndrome and infection in newly admitted critically ill patients [1]. They propose that eosinopenia may become a helpful clinical tool in intensive care unit (ICU) practices. They included different types of severe infections, however, and therefore the utility of eosinopenia for a particular kind of infection is not approached. We would like to describe our experience with a homogeneous group of HIV-infected patients suffering from community-acquired pneumonia (CAP), a severe clinical condition that sometimes can lead the patient to the ICU. We consecutively included 137 HIV-infected patients with a firm diagnosis of CAP based on Infectious Diseases Society of America criteria, whose clinical, analytical and outcome data were prospectively recorded. We split our series into different groups depending on the patient requiring ICU admission (n = 29) or not requiring ICU admission (n = 108), and depending on inhospital patient survival (n = 132) or inhospital death (n = 5). The results are presented in Table 1. As can be seen, eosinopenia was not associated with a higher ICU admission rate or with higher mortality. Accordingly, we believe that the total eosinophil count and/or eosinopenia have little (if any) value in predicting the severity of CAP in HIV-infected patients. Table 1. Relationship between some analytical parameters and severity of community-acquired pneumonia in HIV-infected patientsa From the emergency department point of view – departments that usually are overcrowded [2] – any tool that allows the physicians to better approach the severity of the infections in general, and the severity of the HIV-infected patients developing CAP in particular, would be welcomed [3,4]. Eosinophils seem to fail to fulfil this commitment, while other classic analytical markers, such as the total leukocyte count or C-reactive protein values, remain with greater prognostic value [5]. Authors' responseKhalid Abidi, Ibtissam Khoudri, Jihane Belayachi, Naoufel Madani, Aicha Zekraoui, Amine Ali Zeggwagh and Redouane Abouqal We thank the editor for giving us the opportunity to respond to the comments raised by Dr Perello and colleagues. In our experience, eosinopenia is a good marker for the diagnosis of sepsis on ICU admission [1]. It discriminates well between noninfected patients and infected patients. Our study population did not include HIV-infected patients. Moreover, the prognostic value of eosinopenia was not tested. We therefore cannot ascertain the value of this marker to predict mortality in the ICU. Concerning the severity of infection, Perello and colleagues found no association between eosinopenia and a higher ICU admission rate among HIV-infected patients suffering from CAP. This finding was also reported in our work involving a diverse group of critically ill adults admitted to the ICU. The lack of differences between sepsis, severe sepsis and septic shock was noted in our study. This was not surprising because of the suggested floor effect of eosinopenia. Furthermore, in the study of Perello and colleagues there was no noninfection group enrolled (HIV patients without CAP) to test the value of eosinopenia in the diagnosis of sepsis (CAP) among HIV-infected patients. Gil and colleagues showed in an internal medicine department that inflammatory syndrome associated with eosinophils <40 cells/mm3 is related to bacterial infectious diseases [6]. If we take into account the hypothetical mechanism of eosinopenia, which is the migration of eosinophils to the inflammatory site [7,8], we think it may be interesting if Perello and colleagues used the eosinophil cutoff value (40 cells/ml) to test the value of eosinopenia in distinguishing HIV-infected patients with CAP and those without CAP. AbbreviationsCAP = community-acquired pneumonia; ICU = intensive care unit. Competing interestsThe authors declare that they have no competing interests. AcknowledgementsThe authors thank Red Española de Investigación en Patología Infecciosa. References
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