The IES-R remains a core outcome measure for PTSD in critical illness survivorship research
To the Editor:
In response to Dr. Umberger’s comments  on the Impact of Event Scale-Revised (IES-R)  and the abbreviated 6-item IES (IES-6) , we offer guidance about assessing post-traumatic stress disorder (PTSD) symptoms as part of the existing National Institutes of Health-funded core outcome measurement set (COMS) for clinical research in acute respiratory failure (ARF) survivors .
An originator of the IES-R is no longer distributing the IES-R because PTSD diagnostic criteria have been revised in the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM–5) . Compared to DSM-IV, the DSM-5 separated the avoidance and numbing criteria and increased the number of associated symptoms from 17 to 20 . However, this revision does not fundamentally change the phenotype of PTSD, and the IES-R/IES-6 continues to have utility in screening for PTSD symptoms [3, 5].
With respect to the above mentioned COMS, existing research has been highly heterogeneous in assessing PTSD, thus limiting advances in the field . A 77-member international modified Delphi expert panel evaluated commonly used PTSD measures based on many criteria, including available psychometric evidence in ARF survivors, with a clear consensus recommendation to use the IES-R . Diagnostic criteria for psychiatric disorders change frequently, without fundamental changes to the phenotype. Hence, without rigorous new research on PTSD screening in ARF survivors and another international consensus process, we do not endorse a unilateral change to the PTSD symptom measure recommended within the existing COMS (more information on the COMS is available at www.improveLTO.com).
Information on the Impact of Events Scale-Revised (IES-R) and IES-6 items and scoring
Weiss DS, Marmar CR. The impact of event scale – revised. In Assessing Psychological Trauma and PTSD. 1997, 399–411. (page 408, Chapter 13*)
Douglas Mental Health Institute and McGill University
http://www.info-trauma.org/flash/media-e/diagnosisToolkit.pdf (page 6 of pdf*)
New York University Rory Meyers College of Nursing
https://consultgeri.org/try-this/general-assessment/issue-19.pdf (page 2 of pdf*)
Beck JG, et al. The impact of event scale-revised: psychometric properties in a sample of motor vehicle survivors. Journal of Anxiety Disorders, 2008;22 (2) 187–198.
Hosey et al. Screening for posttraumatic stress disorder in ARDS survivors: validation of the Impact of Event Scale-6 (IES-6). Critical Care, 2019; 23 (1), 1–7. https://ccforum.biomedcentral.com/articles/10.1186/s13054-019-2553-z
We hope that this information may provide helpful clarification in screening for PTSD symptoms in ARF survivors, a task that is essential for improving survivorship outcomes.
All authors contributed expertise to this letter. DMN is the corresponding author. All authors read and approved the final manuscript.
This work was supported by the National Institutes of Health (R24 HL111895).
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The authors declare that they have no competing interests.
- 4.Needham DM, Sepulveda KA, Dinglas VD, et al. Core outcome measures for clinical research in acute respiratory failure survivors. An International Modified Delphi Consensus Study. Am J Respir Crit Care Med. 2017;196(1073-449X (Linking)):1122–30. https://doi.org/10.1164/rccm.201702-0372OC.CrossRefPubMedPubMedCentralGoogle Scholar
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