Intensive Care Medicine

, Volume 34, Issue 11, pp 2106–2111 | Cite as

Extravascular lung water volume measurement by a novel lithium-thermal indicator dilution method: comparison of three techniques to post-mortem gravimetry

  • Benjamin Maddison
  • Riccardo Giudici
  • Enrico Calzia
  • Christopher Wolff
  • Charles Hinds
  • Peter Radermacher
  • Rupert M. Pearse
Brief Report

Abstract

Objective

To compare the lithium-thermal double indicator dilution (Li-thermal), indocyanine green-thermal double indicator dilution (ICG-thermal), single thermal indicator dilution (single-thermal) and gravimetric techniques of extravascular lung water volume (EVLW) measurement in porcine models of acute lung injury.

Design

Two animal models designed to invoke a systemic inflammatory response.

Setting

Laboratory study.

Subjects

A total of 12 immature Deutsches Landschwein pigs.

Interventions

Extravascular lung water volume was measured at four time points using Li-thermal, ICG-thermal and single-thermal techniques. Measurements were performed using existing technology according to manufacturer’s instructions. Post-mortem gravimetric EVLW measurements were performed by measuring wet and dry mass of lung tissue. Measurements were compared using the Bland–Altman method. Data are presented as mean (SD).

Measurements and main results

Data were collected in 12 animals and comparison between all 4 techniques was possible in 10 animals. EVLW measured by gravimetry was 9.2 (±3.0)ml kg−1. When compared to gravimetry, both Li-thermal and ICG-thermal techniques showed minimal bias but wide limits of agreement (LOA) [Li-thermal: bias −1.8 ml kg−1 (LOA ± 13.1); ICG-thermal bias −1.0 ml kg−1 (LOA ± 6.6)]. Comparison between the single-thermal and gravimetric methods identified both considerable bias and wide LOA [+8.5 ml kg−1 (LOA ± 14.5)].

Conclusion

Clinically significant differences between EVLW measurements obtained with the gravimetric method and three in vivo indicator dilution techniques were identified. While none of the techniques could be considered ideal, the ICG-thermal method appeared more reliable than either the Li-thermal or single thermal techniques. Further research is required to determine whether the accuracy of the prototype Li-thermal technique can be improved.

Keywords

Cardiovascular monitoring Intrathoracic blood volume Extravascular lung water Lithium indicator dilution Gravimetry Acute lung injury 

Supplementary material

134_2008_1207_MOESM1_ESM.doc (268 kb)
ESM1 (DOC 269 kb)
134_2008_1207_MOESM2_ESM.doc (41 kb)
ESM2 (DOC 41 kb)

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Benjamin Maddison
    • 1
  • Riccardo Giudici
    • 2
  • Enrico Calzia
    • 3
  • Christopher Wolff
    • 1
  • Charles Hinds
    • 1
  • Peter Radermacher
    • 3
  • Rupert M. Pearse
    • 1
  1. 1.Intensive Care Unit, Royal London HospitalBarts and The London School of Medicine and Dentistry, Queen Mary University of LondonLondonUK
  2. 2.Institute of Anaesthesiology and Intensive Care MedicinePolo Universitario San Paolo, University of MilanMilanItaly
  3. 3.Sektion Anästhesiologische Pathophysiologie und VerfahrensentwicklungUniversitätsklinikumUlmGermany

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