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Background  To propose a combination of blood biomarkers for the prediction of hospital-acquired pneumonia (HAP) and for the selection of traumatic brain-injured (TBI) patients eligible for corticosteroid therapy for the prevention of HAP.    Methods  This was a sub-study of the CORTI-TC trial, a multicenter, randomized, double-blind, controlled trial evaluating the risk of HAP at day 28 in 336 TBI patients treated or not with corticosteroid therapy. Patients were between 15 and 65 years with severe traumatic brain injury (Glasgow coma scale score ≤ 8 and trauma-associated lesion on brain CT scan) and were enrolled within 24 h of trauma. The blood levels of CRP and cortisol total&free,  as a surrogate marker of the pro/anti-inflammatory response balance, were measured in samples collected before the treatment initiation. Endpoint was HAP on day 28.    Results  Of the 179 patients with available samples, 89 (49.7%) developed an HAP. Cortisol total&free  and CRP blood levels upon ICU admission were not significantly different between patients with or without HAP. The cortisol total /CRP ratio upon admission was 2.30 [1.25–3.91] in patients without HAP and 3.36 [1.74–5.09] in patients with HAP ( p  = 0.021). In multivariate analysis, a cortisol total /CRP ratio > 3, selected upon the best Youden index on the ROC curve, was independently associated with HAP (OR 2.50, CI95% [1.34–4.64]  p  = 0.004). The HR for HAP with corticosteroid treatment was 0.59 (CI95% [0.34–1.00],  p  = 0.005) in patients with a cortisol total /CRP ratio > 3, and 0.89 (CI95% [0.49–1.64],  p  = 0.85) in patients with a ratio < 3.    Conclusion  A cortisol total /CRP ratio > 3 upon admission may predict the development of HAP in severe TBI. Among these patients, corticosteroids reduce the occurrence HAP. We suggest that this ratio may select the patients who may benefit from corticosteroid therapy for the prevention of HAP.

critical care

Cortisol total/CRP ratio for the prediction of hospital-acquired pneumonia and initiation of corticosteroid therapy in traumatic brain-injured patients