4.2 Article

Determinants of plasma copeptin: A systematic investigation in a pediatric mechanical ventilation model

Journal

RESPIRATORY PHYSIOLOGY & NEUROBIOLOGY
Volume 185, Issue 2, Pages 222-227

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.resp.2012.10.011

Keywords

Arginine vasopressin; Copeptin; Critical care; Mechanical ventilation; Positive end-expiratory pressure; Stress response

Funding

  1. Thermo Fisher Scientific, BRAHMS GmbH
  2. Hartmann Muller-Stiftung (Zurich)
  3. Zurich Center for Integrative Human Physiology (ZIHP)
  4. Heartbay Foundation (Vaduz)
  5. EMDO Stiftung (Zurich)

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Copeptin, the C-terminal part of the arginine vasopressin precursor peptide, holds promise as a diagnostic and prognostic plasma biomarker in various acute clinical conditions. Factors influencing copeptin response in the critical care setting are only partially established and have not been investigated systematically. Using an in vivo infant ventilation model (Wistar rats, 14 days old), we studied the influence of commonly occurring stressors in critically ill children. In unstressed ventilated rats basal median copeptin concentration was 22 pmol/L In response to respiratory alkalosis copeptin increased 5-fold, while exposure to hypoxemia, high PEEP, hemorrhage, and psycho-emotional stress produced a more than 10-fold increase. Additionally, we did not find a direct association between copeptin and acidosis, hypercapnia, and hyperthermia. Clinicians working in the acute critical care setting should be aware of factors influencing copeptin plasma concentrations. Moreover, our results do have implications for animal studies in the field of stress research. (C) 2012 Elsevier B.V. All rights reserved.

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