Patient-reported Outcomes in Traumatic Brain Injury Research
Mark Sherer, Ph.D., ABPP, FACRM
by Mark Sherer, Ph.D., ABPP, FACRM
Clinical trials of interventions to improve outcome after traumatic brain injury (TBI) have typically used objective measures as the key study outcomes. Such measures were selected based on the judgment of the investigators as informed by their clinical experience and knowledge of the previous literature on TBI. Examples of such outcomes include survival, global outcome (measured by scales such as the Extended Glasgow Outcome Scale or the Disability Rating Scale), cognitive recovery (measured with neuropsychological tests) or community integration (as indicated by employment status or scores on a participation scale such as the Participation Assessment with Recombined Tools [PART]).
More recently, medical outcome research, in general, has begun to focus on the global outcome construct of health-related quality of life (HRQOL). HRQOL can be defined as the impact of a disease or disability on a person’s physical, mental and social wellbeing.1 HRQOL depends on the perspective of the patient and relies on subjective ratings provided by the patient. Outcomes that depend on subjective ratings of the patient are called patient-reported outcomes, and they are seen as complementary to objective outcomes measures. The National Institutes of Health has funded two major initiatives for the development of HRQOL measures. The Patient-Reported Outcomes Measurement Information System (PROMIS) is a measure of HRQOL that was developed through one of these initiatives.2 PROMIS is a general measure that is intended to be applicable to medical research on any disease or injury. The Neurology Quality of Life (Neuro-QOL) is a companion measure of HRQOL intended for persons with stroke, multiple sclerosis, Parkinson’s disease, epilepsy, amyotrophic lateral sclerosis and muscular dystrophy.3
Tulsky and colleagues noted that TBI is a much more common condition than some of the conditions targeted by Neuro-QOL and developed a supplemental measure to PROMIS and Neuro-QOL for use with persons with TBI. This measure is called the TBI-QOL.4 To develop items specific to TBI, Tulsky and colleagues conducted focus groups with persons with TBI, family members/close others of persons with TBI and persons providing health care to persons with TBI. Item banks were developed and administered to large groups of persons with TBI so that final scales and scoring rules could be developed. Key areas assessed by the TBI-QOL are physical health, emotional health, cognition and social participation. TIRR Memorial Hermann was a study site for this data collection and contributed a large portion of the data needed for these analyses. As director of research, I served as a content expert for items measuring self-reported cognitive impairments and also reviewed records to ensure that all participants sustained medically verifiable TBI. Angelle Sander, Ph.D., director of the Brain Injury Research Center at TIRR Memorial Hermann, served as a content expert for items measuring self-reported emotional distress.
Early findings on the TBI-QOL have validated its potential as a useful HRQOL measure for TBI investigations. We have selected the TBI-QOL as the key measure in one of our studies for the TIRR Rehabilitation Research and Training Center on Developing Strategies to Foster Community Integration and Participation in Persons with Traumatic Brain Injury, funded by the U.S. Department of Education National Institute on Disability and Rehabilitation Research (NIDRR). This project seeks to determine the key dimensions of cognitive impairment, self-reported problems and environmental supports that characterize persons with TBI in the post-hospital period of recovery. We have completed an initial manuscript describing these dimensions, which is now undergoing peer review for possible publication.5 In a later step in this program of research, scores on these dimensions will be used to determine clusters of persons with TBI so that different treatment approaches can be recommended for persons with TBI depending on their cluster membership and their scores on the key dimensions.
1Cella D. Measuring quality of life in palliative care. Seminars in Oncology. 1995;22:73-81.
2Cella D, Riley W, Stone A, Rothrock N, Reeve B, Yount S, et al. The Patient-Reported Outcomes Measurement Information System (PROMIS) developed and tested its first wave of adult self-reported health outcomes banks: 2005-2008. Journal of Clinical Epidemiology. 2010;63:1179-1194.
3Cella D, Nowinski C, Peternan A, Victorson D, Miller, Lai J-S, Moy C. The Neurology Quality-of-Life measurement initiative. Archives of Physical Medicine and Rehabilitation. 2011;92 Suppl 1, S28-S36.
4Tulsky DS, Kisala PA, Victorson D, Carlozzi N, Bushnik T, Sherer M, et al. The TBI-QOL: Development and calibration of item banks to measure patient reported outcomes following traumatic brain injury. Journal of Head Trauma Rehabilitation. In press.
5Sherer M, Sander AM, Nick TG, Maestas KL, Hanks R, Novack TA, et al. Dimensions of cognitive functioning, self-reported problems and strengths, and environmental facilitators for persons with TBI in the post-acute period. Rehabilitation Psychology. In review.