Intensive Care Medicine

, Volume 39, Issue 9, pp 1610–1617 | Cite as

Autonomic dysfunction in ICU-acquired weakness: a prospective observational pilot study

  • L. Wieske
  • D. R. P. P. Chan Pin Yin
  • C. Verhamme
  • M. J. Schultz
  • I. N. van Schaik
  • J. Horn
Original

Abstract

Purpose

Intensive care unit-acquired weakness (ICU-AW) is a frequent complication of critical illness. It is unknown if patients with ICU-AW also have autonomic dysfunction, another frequent neurological complication of critical illness. We hypothesized that patients who develop ICU-AW also develop autonomic dysfunction. Furthermore, we hypothesized that patients with ICU-AW are more prone to develop autonomic dysfunction compared to patients without ICU-AW.

Methods

This was an observational cohort study of patients newly admitted to the ICU. Autonomic dysfunction was measured daily using heart rate variability (HRV) to a maximum of 15 days after admission. ICU-AW was diagnosed using the Medical Research Council score. Abnormal HRV was defined using age-matched reference values. The association between ICU-AW and HRV was analyzed using linear mixed effects models.

Results

We included 83 patients, 15 (18 %) of whom were diagnosed with ICU-AW. Of 279 HRV measurements, 204 could be analyzed. Abnormal HRV was found in all critically ill patients irrespective of the presence of ICU-AW (ICU-AW 100 % (IQR 71–100) vs. no ICU-AW 100 % (IQR 40–100); p = 0.40). Mechanical ventilation, sedation, norepinephrine, heart rate, and HRV artifacts were identified as confounders for HRV. ICU-AW was not associated with HRV.

Conclusion

Abnormal HRV is frequent in critically ill patients, both with and without ICU-AW. It is unlikely that patients with ICU-AW are more prone to develop abnormal HRV. However, we found that abnormal HRV may not be an accurate indicator of autonomic dysfunction because of confounders.

Keywords

Intensive care unit-acquired weakness Autonomic dysfunction Heart rate variability Critical illness 

Notes

Acknowledgments

The authors thank G. Sussenbach for his work on the development of the HRV recording equipment and software. This research was performed within the framework of CTMM, the Center for Translational Molecular Medicine (www.ctmm.nl), project MARS (grant 04I-201). Dr. L. Wieske is supported by a personal grant from the Netherlands Organization for Health Research and Development (ZonMw–AGIKO grant [project number 40-00703-98-11636]).

Conflicts of interest

The authors declare that they have no conflict of interest.

Supplementary material

134_2013_2991_MOESM1_ESM.doc (97 kb)
Supplementary material 1 (DOC 97 kb)
134_2013_2991_MOESM2_ESM.doc (82 kb)
Supplementary material 2 (DOC 82 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg and ESICM 2013

Authors and Affiliations

  • L. Wieske
    • 1
    • 2
    • 3
  • D. R. P. P. Chan Pin Yin
    • 1
  • C. Verhamme
    • 2
  • M. J. Schultz
    • 1
    • 3
  • I. N. van Schaik
    • 2
  • J. Horn
    • 1
  1. 1.Department of Intensive Care Medicine, Academic Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands
  2. 2.Department of Neurology, Academic Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands
  3. 3.Laboratory of Experimental Intensive Care and Anesthesiology, Academic Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands

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