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Immature platelet fraction in predicting sepsis in critically ill patients

Roberto Alberto De Blasi| Patrizia Cardelli| Alessandro Costante| Micol Sandri| Marco Mercieri| Roberto Arcioni
Original
Volume 39, Issue 4 / April , 2013

Pages 636 - 643

Abstract

Purpose

To establish whether in critically ill patients without sepsis at intensive care unit (ICU) admission the percentage immature platelet fraction (IPF%) is a cellular marker predicting sepsis to verify a possible correlation between IPF% changes and manifest sepsis and describe the IPF% time course after ICU admission.

Methods

Prospective, observational 7-day study of 64 adult patients admitted to a general ICU at a University Hospital with no sepsis criteria. We measured daily IPF%, procalcitonin (PCT), C-reactive protein, platelets, white blood cell count and coagulation variables. Thirty-one patients with sepsis at ICU admission were studied as controls.

Results

The only variable we tested at ICU admission that predicted sepsis was plasma IPF% (p < 0.001; >4.7 %: sensitivity 56.2 % IC 37.7–73.6; specificity 90.0 % IC 73.4–97.8). IPF% and PCT values were higher for the patients who had sepsis at admission and during the study than in patients in whom sepsis never developed (IPF%: p = 0.017; PCT: p = 0.030). Among the outcome variables, logistic regression was identified as the only variable related to the development of sepsis, IPF% (r = 0.51; p = 0.004). In patients who developed sepsis IPF% was inversely correlated with platelet count (r = −0.60; p < 0.001) and had high values before sepsis became manifest, decreasing significantly on the 2nd day thereafter.

Conclusions

In patients without sepsis at ICU admission IPF% increases before sepsis becomes manifest. Measuring IPF% through an easily available technology can therefore provide an early cellular marker predicting the development of sepsis.

Keywords

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