Rehabilitation for Traumatic Brain Injury
Impact of Traumatic Brain Injury
Injury is the leading cause of mortality among Americans under 45 years of age; TBI is responsible for the majority of these deaths. An estimated 56,000 lives are lost in the United States each year to TBI. Motor vehicle accidents, followed by gunshot injuries and falls, are the leading causes of injuries resulting in death from TBI. Males are 3.4 times as likely as females to die of TBI. About 50 percent of people who sustain TBI are intoxicated at the time of injury.
In a recent analysis based on hospital discharge data and vital statistics, the annual incidence of TBI in the United States was estimated to be 102.8 per 100,000. In males, the incidence peaks between the ages of 15 and 24 (248.3 per 100,000) and again above 75 years of age (243.4 per 100,000). The incidence in females peaks in the same age groups, but the absolute rates are lower (101.6 and 154.9, respectively). These rates underestimate the true incidence of head trauma because patients with milder symptoms at the time of injury usually are not hospitalized.
About three-quarters of traumatic brain injuries that require hospitalization are nonfatal. Each year, about 80,000 survivors of TBI will incur some disability or require increased medical care. Direct medical costs for TBI treatment have been estimated at $48.3 billion per year, including the costs of hospitalization for acute care and various rehabilitation services. In the years 1988 to 1992, reports of average length of stay (LOS) for the initial admission for inpatient rehabilitation range from 40 to 165 days. In one multicenter study (the Model Systems study), the average rehabilitation LOS was 61 days, and the average charge was $64,648 exclusive of physician fees. Total charges averaged $154,256. In more recent studies performed in the early 1990s, rehabilitation LOS and charges were lower, ranging from 19 days and $24,000 for patients with milder injuries to 27 days and $38,000 for those with severe injuries. In the Medicare population in 1994, mean charges for patients admitted for brain injury (excluding stroke) were $42,056.
To focus attention on important questions, the life of an adult survivor of TBI was characterized by the developers of the report in terms of five phases. The first phase is pre-injury. Medical treatment is divided into two phases: the acute (or immediate) treatment phase and the intensive treatment phase, lasting days to weeks. The rehabilitation phase may last months to years. The survivor phase implies the remaining life of the person with TBI and involves continual development and adjustment. This division into phases clarifies the three challenges to assessing the efficacy of rehabilitation discussed above. For each phase, patient populations, interventions, and outcome measures were identified, and the literature was reviewed to answer key questions identified by technical experts.
Key Questions About Traumatic Brain Injury
The following three questions about the status of brain injury research underlie uncertainty about the effectiveness of rehabilitation services.
- How should fundamental concepts such as recovery, functional status, and disability be defined? Because brain function is highly complex, TBI has an extremely wide range of potential outcomes, including cognitive deficits, motor disabilities, emotional and social dysfunction, personality changes, and changes in appearance. As a result, therapeutic aims and perspectives vary widely among studies, as do definitions of outcomes, making valid comparisons across studies difficult.
- How should the type and severity of the injury itself be measured? Variations in methods to assess the severity of injury in patients entering rehabilitation make it difficult to estimate the effectiveness of different rehabilitation methods.
- Which therapies are effective, and what is the best way to match patients with treatment approaches likely to be effective for them?
Today, a person's path to rehabilitation after sustaining brain injury may be determined by the mechanism of injury, the resources of the community, the person's employment or financial status, the consent of the family, and/or the accuracy of the emergency department diagnosis. While a few metropolitan areas have organized referral systems that connect patients with resources and rehabilitation programs, systematic methods for evaluating the needs of people who have sustained brain injury and referring them to appropriate programs are unusual. Without knowing the efficacy of rehabilitation methods in their specific applications, systematic referral that produces the desired result is not possible.
Reporting the Evidence
Two panels of experts worked with the research team to identify key questions in the rehabilitation and survivor phases for adults with TBI. The first panel was composed of two physiatrists, a survivor of TBI, the wife of a survivor of TBI, a State vocational rehabilitation counselor, a neuropsychologist, a psychologist, a clinical coordinator of an outpatient TBI rehabilitation program, and a rehabilitation clinical nurse specialist, all from the Portland, OR, area. The second panel was composed of nationally recognized experts in rehabilitation.
The panels formulated five questions pertaining to the phases of recovery described above. These questions addressed the effectiveness of (1) early rehabilitation in the acute care setting (timing), (2) intensity of rehabilitation, (3) cognitive rehabilitation, (4) supported employment, and (5) care coordination (case management). For each of these questions, members of the research team worked with panelists to write a brief rationale for the question, define key terms, and specify the relevant patient populations, interventions, and outcome measures to be examined in the literature review. The questions were:
Should interdisciplinary rehabilitation begin during the acute hospitalization for traumatic brain injury?
Does the intensity of inpatient interdisciplinary rehabilitation affect long-term outcomes?
Does the application of cognitive rehabilitation enhance outcomes for people who sustain TBI?
Does the application of supported employment enhance outcomes for people with TBI?
Does the provision of long-term care coordination enhance the general functional status of people with TBI?
One small, retrospective, observational study from a single rehabilitation facility supports an association between the acute institution of formalized, multidisciplinary, physiatrist-driven TBI rehabilitation and decreased length of stay (acute hospital and acute rehabilitation) and some measures of short-term physiologic (noncognitive) patient outcomes. The level of evidence is Class III. This study concerned adult patients with severe brain injury (Glasgow Coma Scale 3-8); there is no evidence from comparative studies for or against early rehabilitation in patients with mild and moderate injury.
When measured as the hours of application of individual or grouped therapies, there is no indication that the intensity of acute, inpatient TBI rehabilitation is related to outcome. Because of methodological weaknesses, however, previous studies are likely to have missed a significant relationship if one exists (a Type II error). These studies contained insufficient information about severity of injury and baseline function to ensure the comparability of compared groups. Also, these studies did not consider the quality of individual treatments, their lack of autonomy in the cognitive realm, and the delivery milieu. One or more of these factors may affect the outcome of care more than the time spent in each modality. Therefore, future research into efficacy of acute inpatient TBI rehabilitation must more adequately measure such factors and include the factors in their predictive models. Future studies also must employ a wider spectrum of outcome measures, including measurement of outcomes across longer periods of time after discharge.
From a clinical aspect, the evidence does not support equating different TBI rehabilitation delivery systems based on equivalent times of patient exposure to various therapeutic modalities. For example, this analysis would not support predicting that patient benefit would be equal if an equal time spectrum of rehabilitation therapies were delivered at a rehabilitation center as compared with a skilled nursing facility. More detailed analysis of factors involved in predicting response to rehabilitation modalities must be considered in approaching such questions.
Additionally, mandating a minimum number of hours of applied therapy for all TBI patients is not supported by the present state of scientific knowledge. How much of which intervention(s) optimizes recovery in a given type of patient has been inadequately studied. It is certainly reasonable to avoid situations in which patients do not receive potentially beneficial treatment. Based on the above studies, however, defining a minimal rehabilitation program in terms of time of applied therapy is not likely to optimize either the therapists' time or patients' recovery. It is probable that specific basic programs will have to be related to individual patient groups. Developing such algorithms requires further research.
Many patients who suffer TBI do not enter acute inpatient rehabilitation. Only one study of the effectiveness of inpatient rehabilitation included a comparison group of patients who did not undergo inpatient rehabilitation. Future studies should compare acute, inpatient rehabilitation to commonly used alternatives to inpatient rehabilitation, such as care in a well-staffed skilled nursing facility or in less intense variations of acute rehabilitation. Very little is known about the outcomes of TBI in these settings.
There is evidence from two small studies (Class I and Class III) that a personally adapted electronic device, a notebook, and an alarm wristwatch reduce everyday memory failures for people with TBI. There is evidence from one study (Class II[a]) that compensatory cognitive rehabilitation (CCR) reduces anxiety and improves self-concept and relationships for people with TBI. Evidence from two studies (Class I and Class II[b]) supports the use of computer-aided cognitive rehabilitation (CACR) to improve immediate recall on neuropsychological testing, but the clinical importance of this finding has not been validated.
Class II evidence indicates that supported employment can improve the vocational outcomes of TBI survivors. Nearly all information about supported employment comes from two bodies of work, each of which used different experimental designs and different models of supported employment. The findings have not been replicated in other settings or by other centers, so the generalizability of these programs remains untested.
There have been very few studies on the effectiveness of case management, and the results of these studies are mixed. The only outcome for which there were results in the same direction from two or more studies pertained to changes in vocational status. This was associated with the single case-manager and insurance approach, as well as with the combined nurse and vocational case-manager model. There were conflicting results about the effects of case management on disability or functional status, living status, family impact, and other aspects, and some findings were mentioned in only one study. The clinical trial resulted in no functional status changes among case-managed subjects, despite an extended period of rehabilitation. However, when two forms of case management were compared, both the single and multiple case-manager/insurance approaches showed significant functional improvements.
The evidence report identifies the following areas for future research.
- Randomized trials of the timing and intensity of early and acute rehabilitation would be useful. Because the patient characteristics that affect outcomes also affect the type and level of rehabilitation services delivered, it may be unlikely that any observational study can provide definitive evidence about effectiveness. Moreover, assigning patients to different levels of intensity or to early versus conventional initiation of rehabilitation in a prospective trial may be ethically acceptable, since these different levels represent a range of current practice rather than a deviation from it.
- Population-based studies of all patients with TBI, including those who do not enter inpatient rehabilitation facilities, are imperative. Important questions about the effectiveness of rehabilitation and its component disciplines require the development of regional or national registries, with standardized data collection and identification and followup of all patients with head injury.
- Research designs for future studies should incorporate health outcomes of importance to people with TBI and their families. Commonly used measures should be more strongly linked to health outcomes. Future studies should address the effect of spontaneous recovery, systematize criteria for entering cognitive rehabilitation, and differentiate between the effects of general stimulation and specific techniques.
- The greatest overall need for the evaluation of supported employment programs is a series of trials with adequate controls and unbiased allocation of clients to the conditions compared.
- Future research should focus on improving the outcome measures used to examine the results of case management in TBI rehabilitation. In addition to outcomes of changed patient functionality, there should be outcomes of changed family functionality. Since much of case management communication is directed toward helping family members learn what to expect and where to obtain services, relevant outcomes would include family use of community and rehabilitation services and indicators of family assertiveness about care expectations. While case management may exert only an indirect effect on a patient's functional outcomes such as level of disability, vocational status, and living status, it is possible that case management can directly affect family knowledge of TBI rehabilitation needs and services, level of psychosocial anxiety, and family competency in coping with TBI.