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Volume 3 Supplement 1

ESICM LIVES 2015

Diagnostic and prognostic usefulness of mid-regional pro-adrenomedullin levels in patients with severe sepsis

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Introduction

Mid-regional pro-adrenomedullin (MR-proADM) is a fragment of 48 amino acids which splits from the final proADM molecule in a ratio of 1:1 with ADM. It is essentially irrelevant, but proportionally represents the levels and activity of ADM. Its half-life is several hours longer, and its plasma concentrations can be determined in clinical practice. It has been identified as a prognostic marker, stratifying the mortality risk in patients with sepsis.

Objectives

To evaluate the usefulness of MR-proadrenomedullin (MR-proADM) levels in the diagnosis and prognosis of sepsis in patients admitted to the ICU.

Methods

Prospective observational single-center study. A total of 120 consecutive patients with suspected severe sepsis were recruited to the ICU of Jerez Hospital. Epidemiological, clinical, laboratory data and MR-proADM, Procalcitonin (PCT), and C-reactive protein (CRP) levels were collected at the time of admission, at 48 hours, at the 5th day and on the day of discharge from the ICU.

Results

104 patients were diagnosed at discharge of severe sepsis and 16 patients were diagnosed of SIRS without sepsis. The group of septic patients reached MR-proADM levels of 4.05 nmol/l vs of 0.309 nmol/l in not septic patients (p < 0.0001). The AUC-ROC was 0.9474 (Figure 1).

Figure 1
figure1

ROC curve MR proADM sepsis diagnosis.

At 48 hours after admission the MR-proADM levels in surviving septic patients fell to 1.65 nmol/l and in the non-survivors 2.475 nmol/l (p = 0.04). On the 5th day following admission the survivor levels fell to 1.36 nmol/l vs 3.42 nmol/l in the septic patients who died in the ICU (p = 0.0006). At the 5th day the survivors showed greater clearance MR-proADM with a median level of 62.7% vs 21.2% in the non-survivors (Table 1).

Table 1 MR-ADM levels and clearance in survival subgroups

The AUC the ROC curve at the 5th day was: MR-proADM 0,828(p = 0,001); PCT 0.725 (p = 0,016) CRP 0.700 (p = 0,0214). The AUC the ROC curve to MR-proADM clearance at the 5th day was 0,734 (p = 0,0104) (Figure 2)

Figure 2
figure2

ROC curves Biomarker 5th day prognosis.

Patients with MR-proADM levels of 2.5 nmol/l and above or MR-proADM clearance less than 30% at the 5th day following admission in the ICU showed an enhance in mortality (p < 0.0001). In the multivariate analysis (Cox proportional hazards models) MR-proADM levels and MR-proADM clearance at the 5th day following admission, were statistically significant predictive factors for mortality in the ICU and at 90 days (Figure 3).

Figure 3
figure3

multivariate analysis mortality 90 days.

Conclusions

Initial MR-proADM levels help to identify the infectious origin in patients with SIRS and organ dysfunction. MR-proADM levels and its clearance at the 5th day following admission are the most effective biomarker to determine unfavorable evolution and the risk of mortality in patients with severe sepsis admitted to the ICU.

Author information

Correspondence to F Valenzuela Sanchez.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Valenzuela Sanchez, F., Valenzuela Mendez, B., Bohollo de Austria, R. et al. Diagnostic and prognostic usefulness of mid-regional pro-adrenomedullin levels in patients with severe sepsis. ICMx 3, A306 (2015) doi:10.1186/2197-425X-3-S1-A306

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Keywords

  • Severe Sepsis
  • Organ Dysfunction
  • Septic Patient
  • Procalcitonin
  • Prognostic Usefulness