Estudo da homeostase dos mediadores pró-inflamatórios e antiinflamatórios na sepse neonatal / A Study of the homeostasis of the pro-inflammatory and anti-inflammatory mediators in neonatal sepsis

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Objectives - To evaluate the utility of the pro-inflammatory mediators (TNF-alfa, IL1-beta, and IL-6), the anti-inflammatory mediators (IL-10 and IL-1Ra) and C-Reactive Protein (CRP) for the diagnosis of neonatal sepsis; to verify whether the isolated seric values or the relation between IL-6 and IL-1Ra have predictive values for severity regarding the clinical outcome, and to ascertain if the homeostasis between the pro-inflammatory and anti-inflammatory mediators and CPR can define the prognosis of the disease. Patients and Methods - The study included 31 newborns (NB) admitted to the UCINE (External Neonatal Unit) or to Hospital Universitário (São Paulo University Hospital) with diagnosis of sepsis based upon clinical and laboratorial parameters. The NB with diagnosis of sepsis were further subdivided into 2 groups according to the clinical outcome: sepsis group: containing those NB who evolved to a positive outcome, and severe sepsis group, in turn composed of the NB with unsatisfactory outcomes due to complications caused by septic shock and/or DIVC and/or FMOS and/or death. On days 0, 3, and 7 following diagnosis the seric levels of TNF-alfa, IL-1 beta, IL-6, IL-10, and IL-1Ra were measured in addition to the routine sepsis workup. Results - The general follow-up analysis revealed that all the inflammatory mediators presented elevated levels at diagnosis (day 0) with a decrease of these values over time. Regarding the pro-inflammatory mediators, TNF-alfa, IL-6 and IL-1 beta were satisfactory for diagnosis, whereas IL-6 was more accurate for follow-up. In relation to the anti-inflammatory mediators, IL-10 revealed the same pattern of the pro-inflammatory mediators following the septic process resolution, whereas IL-1Ra gradually decreased until the 3rd day but hence remained stable until the 7th day, thus characterizing the continuity of the anti-inflammatory action of this cytokine. Concerning the inter-relation between the pro and anti-inflammatory mediators (IL-6/IL-1Ra relation and IL-6/(IL6+IL-1Ra)) we observed that the IL-6/IL-1Ra correlated with the septic process evolution with predominance of the proinflammatory action on day 0 and of the anti-inflammatory action on day 7. The CRP levels, we observed that in the sepsis group with satisfactory outcome on day 0 the seric values were higher than in the severe sepsis group, although on days 3 and 7 these values decreased more substantially, while in the sepsis group they increased on day 3 followed by a gradual decrease until day 7. Conclusions - The analyzed mediators were effective in the diagnosis of neonatal sepsis and also predictive of the degree of severity, mainly with regards to cytokines IL-6 and IL-1Ra. The homeostatic equilibrium/disequilibrium was correlated to the type of disease outcome: sepsis with no complications versus severe sepsis.

ASSUNTO(S)

infant newborn recém-nascido diagnosis clinical interleukin-10 interleukin-6 c reactive protein interleukin-1 receptor antagonist interleukin-1 beta prognóstico fator de necrose tumoral alfa homeostase inflammation mediators proteína c-reativa antagonista do receptor da interleucina-1 mediadores pró-inflamatórios e antiinflamatórios tumor necrosis factoralpha diagnóstico clínico interleucina-1-beta interleucina-6 sepse interleucina-10 homeostasis sepsis prognosis

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