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3 Factors Affecting Recovery Multiple factors may affect recovery after traumatic brain injury (TBI), including the individual’s severity of injury; access and response to treat- ment; age, preexisting environmental, genetic, or medical complications; or conditions co-occurring with the primary condition. It is important to note that recovery is not one dimensional. Practitioners and researchers measure outcomes in various ways, ranging from mortality to ability to return to preinjury employment status. However, TBI survivors themselves and their families are likely more interested in quality-of-life outcomes, such as re- integration into the community, successful return to work or school, and functional capacity in everyday life. Previous chapters have addressed severity of TBI and other injury- related factors affecting outcome. This chapter describes the premorbid conditions (e.g., learning disabilities or psychiatric conditions), comor- bidities (e.g., stress-related psychiatric disorders or somatic symptoms), and contextual factors (i.e., social environmental) affecting cognitive and functional recovery from TBI. The following sections are not intended to be an exhaustive review of all possible associated conditions; rather this synthesis of the literature focuses on those factors that the committee de- termined were most relevant for this report—those that may interfere with an individual’s response to rehabilitation following TBI, including cognitive rehabilitation therapy (CRT). These issues are discussed within the context of both civilian and military populations. Figure 3-1 shows the environmen- tal, personal, or medical factors that may affect recovery. 59
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60 COGNITIVE REHABILITATION THERAPY FOR TBI Participation in Society Impairments Activities Quality of Life The ability to carry out Cognitive: Community important activities in Attention participation the physical and Executive function Educational social environment. Language and social attainment communication Employment status Memory Family/caregiver Visuospatial perception health Quality of life and Physical: well-being Fatigue Role in the home Pain Seizure disorder Sleep disturbance Vision Psychological: Anger and irritability Anxiety Depression Posttraumatic stress disorder Stress Mechanism of injury Deployment and postdeployment stressors Environmental Multiple TBIs Disability supports/service status Factors Polytrauma Family functioning Severity of injury Social support Transportation access Age Behavioral problems (e.g., anger, aggression) Personal Cognitive reserve (e.g., Comorbid conditions concurrent with TBI (visual Factors IQ, education) impairment) Gender Comorbid conditions due to TBI (e.g., epilepsy) Genetics Lack of awareness of deficits Premorbid Neurodevelopmental disorders neurodevelopmental or Pain mental health disorders Psychological comorbid conditions (e.g., anxiety, depression, PTSD) Sleep disturbances Access to acute care Access to general medical, mental or behavioral, Medical Care Quality of care and rehabilitation care Factors Quality of care Factors Affecting Factors Affecting Initial Response to TBI Recovery from TBI FIGURE 3-1 Factors affecting initial response to TBI and recovery from TBI. PREINJURY CONDITIONS Individuals who sustain TBI may have preexisting conditions, as well F igure 3-1 as diverse cognitive, medical, genetic, and environmental backgrounds that potentially moderate the effects of injury. Each of these elements (indepen- dently and collectively) along with the heterogeneity of TBI can affect an in-
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61 FACTORS AFFECTING RECOVERY dividual’s initial response to trauma and subsequent response to treatment. Gaps in knowledge exist regarding the effects of preexisting conditions on outcome following TBI, and it is often difficult to differentiate the effects of preinjury factors from those related to the injury itself or the postinjury environment. Preinjury conditions, such as attention deficit hyperactivity disorder (ADHD), learning disabilities, or mild forms of syndromes on the autism spectrum (e.g., Asperger’s), may also affect an individual’s cognitive deficits after a TBI, as well an individual’s ability to acknowledge an injury, seek screening or treatment, understand a diagnosis and subsequent treat- ment plans, and set appropriate goals for treatment success. Preinjury depression may affect the manifestation of various TBI-related effects. In a study of TBI by Bombardier et al. (2010), a prior history of depression among patients correlated with higher post-TBI rates of major depressive disorder. Although screening attempts to prevent individuals with most major affective disorders from military service, instances of bipo- lar disorder, schizophrenia, or substance use disorder (SUD), among others, may go undiagnosed. Corrigan et al. (2003) demonstrate that about half of the civilian subjects in TBI Model Systems, a national data repository of information about the acute and postacute care of individuals with TBI, had preinjury SUD. Emotional disturbance and ongoing substance abuse can also affect a survivor’s capacity to cognitively engage in and potentially benefit from even a well-designed cognitive rehabilitation program. Other preexisting factors may contribute to poor outcomes following TBI, including a lack of social support systems and environmental factors. Socioeconomic status (SES) is an environmental factor that can affect cogni- tive, behavioral, and functional outcomes. Socioeconomic status is associ- ated with low education status or low IQ. But the relationship between low SES and a worse outcome may be due to the limited resources available to the individual and the family, including access to high-quality rehabilitation and availability of family members to act as caregivers. If an individual from low SES suffers a TBI in the military, that person may be afforded the opportunity for continued treatment and care due to his service, which may otherwise be unavailable. However, due to work restrictions or other responsibilities, that person’s family or other caregivers may not be able to provide the support system and care the person needs after hospitalization and during a structured rehabilitation program. COMORBIDITIES Comorbidities are conditions that occur in addition to the primary insult, injury, or disease. Comorbidities can occur by chance (i.e., two or more conditions occurring simultaneously, with one condition not the direct origin of the other), or by causal association (Valderas et al. 2009). Causal
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62 COGNITIVE REHABILITATION THERAPY FOR TBI conditions may be linked in one of two ways: by direct causation, where one disease or injury results in another disorder, e.g., when TBI leads to memory impairment or epilepsy, or by associated risk factors, where the en- vironment or agents leading to one condition also may manifest in another, e.g., sustaining a TBI and broken femur in the same explosion (Valderas et al. 2009). Co-occurring conditions have also been explained by selection bias, meaning those who seek treatment may be more likely to have more than one disease or adverse health condition (Valderas et al. 2009). Comorbidities of TBI may include behavioral, psychiatric, physical, or cognitive disorders. These are generally causal associations—either due to direct causation or associated risk factors. Just as cognitive and psychi- atric disorders can occur as preexisting conditions, they are also the most common comorbidities following injury, particularly in the long term. For example, TBI has been shown to be associated with the premature onset of neurodegenerative diseases, including dementia (Kiraly and Kiraly 2007). Common comorbidities include depression, anxiety disorders (e.g., PTSD), and SUD, all discussed further in this chapter. These comorbidities may also be differentially reflected in civilian and military populations due to the nature of deployment, prolonged battle, or other challenging war zone conditions experienced by members of the mili- tary. In severe TBI in civilian populations, behavioral disturbances includ- ing irritability, disinhibition, aggression, and lack of insight or awareness pose a burden to caregivers and a challenge for rehabilitation clinicians. Meanwhile, the most commonly reported comorbidities among military populations include depression and anxiety disorders. Of these, posttrau- matic stress disorder (PTSD) has been reported in 43 percent of service members who sustained blast-related mild TBI associated with alteration of consciousness (Hoge et al. 2008). Mental health disorders can affect soldiers’ and veterans’ quality of life, ability to engage in social activities or employment, and capacity to resume satisfying lives within their families and communities (Sandberg et al. 2009). Additionally, mental health dis- orders may have direct effect on neuropsycological functioning. They also have the potential to interfere with recognition of the need for treatment or the ability to actively engage in therapies like CRT. Depression Depression is defined by symptoms including sadness, apathy, nega- tive thoughts, low energy, cognitive distortions, inability to enjoy everyday activities, and suicidal ideation (APA 2000). Depression is a common and disabling mood disorder that can significantly diminish an individual’s quality of life. Studies have found that the rate of depression post-TBI is nearly eight times higher than the general population’s rate (53.1 versus
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63 FACTORS AFFECTING RECOVERY 6.7 percent) (Bombardier et al. 2010). Furthermore, depression may also develop indirectly years after an injury as a result of the effects of TBI and maladaptive readjustment (Moldover et al. 2004). Anxiety Disorders According to a growing body of literature, anxiety disorders (e.g., Generalized Anxiety Disorder, PTSD, and others) can develop after mild, moderate, or severe TBI (Bryant et al. 2010; Zatzick and Grossman 2011). Furthermore, as anxiety disorders are a common preinjury condition, oc- curring in 29 percent of the general population (Kessler et al. 2005), it has been suggested that they continue to exacerbate issues postinjury (Moore et al. 2006). Anxiety disorders have been documented as co-occurring with TBI to varying degrees in many studies. Virtually all types of anxiety dis- orders have been documented individuals who have experienced mild TBI, including Generalized Anxiety Disorder at 3 to 28 percent, panic disorder at 4 to 17 percent, and obsessive-compulsive disorder at 2 to 15 percent (Moore et al. 2006). Posttraumatic Stress Disorder Individuals diagnosed with PTSD reexperience unwanted and disturb- ing memories associated with a trauma. To cope, these individuals avoid thinking about the event or experience psychic numbness, often vacillating between emotional numbing and distress in response to reexperiencing symptoms. PTSD is also characterized by increased arousal, which may manifest as hypervigilance, irritability, impaired concentration, exaggerated startle response, and sleep disturbance (Sayer et al. 2009). Sleep issues, cognitive problems, or emotional issues associated with PTSD may nega- tively impact one’s ability to cope with effects of TBI (Lew et al. 2009). The prevalence of PTSD as a comorbid condition is higher in military TBI than in civilian TBI. Furthermore, a lack of research exists concerning how comorbid PTSD affects veterans and service members who have sustained mild, blast-related TBI. A Rand report released in 2008 included survey results on previ- ously deployed service members with TBI from Operation Enduring Free- dom (OEF) in Afghanistan, and Operation Iraqi Freedom (OIF) in Iraq (Adamson et al. 2008). The report found that one-third of study partici- pants “met criteria for probable PTSD” (Adamson et al. 2008). This strong association between TBI with PTSD was also reflected in a study of recently returned infantry soldiers, which shows that 43.9 percent of the infantry soldiers experienced PTSD symptoms after a loss of consciousness due to TBI, compared to 27.3 percent after an altered mental state, 16.2 percent
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64 COGNITIVE REHABILITATION THERAPY FOR TBI with other injuries, and 9.1 percent with no reported injuries (Hoge et al. 2008). Civilians may also experience PTSD associated with TBI, due to terrifying circumstances that may lead to an injury, such as a motor vehicle accident or assault. Studies have reported varying frequencies of connection between TBI and comorbid PTSD, ranging from 20 percent of individuals (Bryant and Harvey 1999) to 84 percent (Feinstein et al. 2000). While the relationship between PTSD and TBI severity has not yet been well studied, TBI severity appears to have a role in PTSD diagnosis. In civilians and military members, the prevalence of PTSD is higher in patients with milder injuries (Adamson et al. 2008; Hoge et al. 2008). Patients with more se- vere TBI show less risk of developing symptoms consistent with a PTSD diagnosis (Zatzick et al. 2010), possibly due to more prolonged periods of unconsciousness following the trauma. Substance Use Disorders Substance use disorders commonly occur among adults who have ex- perienced a TBI. Substance abuse and dependence after TBI can complicate individuals’ efforts to successfully recover from their injury, particularly in the areas of employment and social reintegration. A cross-sectional study of substance abuse program participants reported that 10 to 20 percent of individuals with TBI, with no preinjury substance abuse issues, were substance abusers after their injuries (Corrigan et al. 1995). Other studies reveal a different story, possibly due to differences in study design or patient populations. For example, several longitudinal studies of individuals with no preinjury history of substance abuse rarely develop alcohol or drug use problems after TBI (Bombardier et al. 2003; Kreutzer et al. 1996; Ponsford et al. 2007). These studies report that less than 10 percent of participants became substance abusers after TBI. SUDs can be both a cause and effect of TBI. Alcohol and illicit drug use in civilian populations represents a risk factor for TBI, primarily through accidents or acts of violence. However, service members deployed in OEF and OIF have limited access to alcohol and illicit drugs; thus, use of these substances at the time of injury is uncommon (Warden 2006). However, substance use as a comorbid condition with TBI has been associated with military discharge. Compared with all those discharged from the military, people with mild TBI were more than two times as likely to be discharged for alcohol, drugs, or criminal convictions, and people with moderate TBI were about five times more likely to be discharged for alcohol or drug problems (Ommaya et al. 1996). Patients with more severe brain injuries who were substance abusers preinjury may have a period of abstinence in the immediate postinjury period, but many survivors return to preinjury use levels at 2 years from injury (Corrigan et al. 1995).
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65 FACTORS AFFECTING RECOVERY Other Comorbid Conditions Other conditions associated with TBI that may adversely affect treat- ment success, especially when the injury is more severe, include lack of awareness, agitation, aggression, disinhibition, and apathy (Ciurli et al. 2011; Flashman and McAllister 2002; Kim 2002). Other comorbid con- ditions particularly relevant to service members are those commonly as- sociated with blast injuries, which can include physical injuries to the musculoskeletal system (including amputation and fracture), soft tissue, oral/maxillofacial areas, auditory, and visual systems (Sayer et al. 2009). Fatigue, pain, and sleep disturbance are especially common conditions in service members or veterans who experience TBI, and these conditions are likely to affect an individual’s participation in rehabilitation (DVBIC 2010). Fatigue Fatigue is a common complicating condition following TBI and is prevalent even months following injury (Belmont et al. 2006; Lundin et al. 2006a, 2006b; Ziino and Ponsford 2005). Fatigue is generally defined as a feeling of physical or mental exhaustion, tiredness, or weakness. It is highly interrelated with other conditions, such as sleep disturbance or depression, but these are often patient-specific correlations. Furthermore, after TBI, physical fatigue is more prevalent and severe than fatigue based on depres- sion, pain, or sleep disturbance (Cantor et al. 2008). Fatigue may deter a person’s active participation in rehabilitation activities, and therefore, may mediate response to CRT; however, these connections have not been studied extensively. Pain The co-occurrence of TBI and pain is common and may arise from cognitive and physical trauma often experienced with more severe injuries, or changes in brain functioning that affect sensory and motor functioning and, perhaps, perception of pain stimuli (Sherman et al. 2006). Following TBI, frequently reported locations of pain include the head, back, legs, and shoulders. Headaches alone are one of the most common symptoms after TBI, affecting more than 30 percent of the population and often continu- ing long after injury (Model Systems Knowledge Translation Center 2011). Pain, including headaches, may be referred to as chronic if it persists for an extended period of time (i.e., 3 to 6 months or more). Chronic pain is often associated with other problems, including functional disability, psy- chological distress, litigation/compensation issues, and family discord and vocational issues (Lew et al. 2009). A recent metaanalysis considering only
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66 COGNITIVE REHABILITATION THERAPY FOR TBI veteran populations with TBI found a 43.1 percent prevalence of reported pain (Nampiaparampil 2008). In addition, pain and PTSD are often inter- twined, as a chronic pain flare-up may generate PTSD-related thoughts and PTSD symptoms such as hyperarousal may increase pain intensity (Lew et al. 2009). Sleep Disturbance Diagnosed sleep disorders following TBI include excessive daytime sleepiness, hypersomnia, insomnia, and parasomnia and circadian rhythm alterations, such as delayed sleep phase syndrome and irregular sleep–wake pattern (Ayalon et al. 2007; Baumann et al. 2007). Previous research has shown that among brain-injured adults, sleep disturbance causes daytime sleepiness, fatigue, poorer levels of overall functioning (Verma et al. 2007), and a lack of necessary quality sleep. For patients recovering from TBI, lack of quality sleep can exacerbate symptoms such as pain, irritability, and cognitive deficits (Ouellet and Morin 2007). Insomnia is common following TBI and has been reported in frequen- cies from 3 to 84 percent of TBI patients (Zeitzer et al. 2009). The cause of insomnia following TBI can be direct (e.g., secondary to neural damage), indirect (e.g., secondary to depression), or unrelated, though still present. Population-based studies indicate that insomnia occurs in approximately 40 percent of individuals with TBI of any severity and is often the most prevalent somatic complaint (Schwab et al. 2007). Sleep apnea (i.e., sleep- disordered breathing), a prevalent disorder in the general population, has been reported to be present in about half of the U.S. Department of Veter- ans Affairs (VA) TBI patient population (Zeitzer et al. 2009). Treatment Options for Pre- and Comorbid Conditions Many treatment options are available for the preinjury conditions and comorbidities described in this chapter. Of particular concern is these factors’ potential influence on or interference with CRT. In addressing the needs of the whole person for optimal outcome, the presence of pre- or comorbid conditions requires optimal coordination of treatments to address psychiatric or physical conditions in addition to cognitive impairments. Treatment coordination may include sequential versus concurrent treat- ment, or separate versus integrated approaches. For example, addressing PTSD symptoms first may enhance later response to CRT interventions for attention deficits, because the individual will be less distracted by psy- chological symptoms during rehabilitation. Likewise, one study showed improved cognitive function in patients treated for major depressive disor- der (Herrera-Guzmán et al. 2010). Although the study did not include TBI
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67 FACTORS AFFECTING RECOVERY participants, the relationship between treatment for psychological disorders and cognitive function may warrant future study. Medications are commonly prescribed to treat a range of physical or psychological symptoms. Medications that have a sedating effect or other adverse effect on cognition may affect the individual’s attention and ability to participate in CRT. However, a lack of extensive data exists on this is- sue. In addition to pharmacologic treatment, cognitive behavioral therapy, a form of psychotherapy, is commonly used to treat psychological condi- tions such as depression or PTSD (Foa et al. 2009). A previous Institute of Medicine (IOM) report evaluating PTSD interventions found sufficient evi- dence to support the effectiveness of exposure-based interventions, of which cognitive behavioral therapy is one (IOM 2008). As described in Chapter 4, cognitive behavioral therapy is distinct from CRT in both the target of the intervention and the specific intervention components. Cognitive behavioral therapy for PTSD typically consists of four basic components: psychoedu- cation, imaginal or in vivo exposure to the trauma or feared stimuli, reap- praisal of distorted beliefs and thoughts, and anxiety management training (Harvey et al. 2003). Cognitive behavioral therapy interventions are desig- nated as a first-line strategy for mental health specialty treatment of PTSD within the VA/Department of Defense (DoD) Clinical Practice Guidelines for Management of Posttraumatic Stress (VA/DoD 2010) and by several other professional and scientific organizations. CONTEXTUAL FACTORS In addition to preexisting and comorbid conditions, relevant contextual factors (e.g., social environment) may influence the path to recovery from TBI. Social and family support can influence treatment outcome. In addi- tion, compensation and disability status or application (e.g., through work- man’s compensation, disability insurance, or litigation) have been shown to create patterns of symptom reporting among TBI populations. Finally, contextual conditions such as deployment and subsequent return home are important for military populations. Family and Social Support Family members and significant others play a key role in the recovery of adults with TBI. A key social-environmental factor that can affect the recovery process and outcome is family functioning, as families are often partners in the rehabilitation process and can play a role in goal planning and generalization of skills and knowledge to the home setting (Levack et al. 2009). Successful rehabilitation requires family cooperation in a variety of areas such as transportation, finances, leisure, and emotional support
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68 COGNITIVE REHABILITATION THERAPY FOR TBI (Jacobs 1988). From a health care systems perspective, family members or caregivers provide a large portion of the care needed to help adults with TBI function on a daily basis. Family functioning has been associated with greater improvement in people with TBI, including improvement in overall disability, level of functioning, and employability. On the other hand, fam- ily stress and unhealthy family communication and roles can hinder the rehabilitation process (Sander et al. 2002). Holistic approaches to CRT often include some family interventions, which could include educational, skill-building, and psychological support components. The results of the few family-intervention studies, while mixed in their conclusions, have re- ported such benefits to families as a greater number of needs being met, a perception of fewer obstacles to receiving services posttreatment (Kreutzer et al. 2009), improvement in psychological distress (Brown et al. 1999; Sinnakraruppan and Williams 1991), reduced burden, improved satisfac- tion with caregiving, and increased perception of caregiving competency (Albert et al. 2002). However, use of effective problem solving and coping strategies by the family was related to lower levels of depression for the person with TBI (Leach et al. 1994). Disability Status or Compensation-Seeking Behavior Compensation-seeking behavior or litigation has been shown to im- pact recovery rates and symptom patterns. The majority of studies on this topic indicate that TBI survivors actively engaged in litigation report more postconcussional symptoms (versus nonlitigants). Compensation seekers or litigants experience longer-lasting symptoms, which may result in delayed work return and higher levels of psychological stress (possibly due to the injury, unresolved financial issues, or both) (Blanchard et al. 1998; Cook 1972; Feinstein et al. 2001; Miller 2001; Paniak et al. 2002; Wood and Rutterford 2006). Deployment and Postdeployment Factors In a war zone, individuals are exposed to a number of factors that can influence physical and emotional health. Among the most salient of these exposures are physical trauma and psychological stressors or trauma. Physical trauma can lead not only to TBI, but also to other bodily injuries. Psychological trauma can result in a broad array of adverse outcomes including, but not limited to, PTSD and depression. Moreover, physical trauma can be associated with adverse psychological consequences, and psychological trauma can have physical symptoms. War-zone stress ex- posures may be particularly potent, as they are not typically limited to a single trauma. The co-occurrence of trauma to multiple body systems is
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69 FACTORS AFFECTING RECOVERY often referred to as polytrauma (see Chapter 2 for more details on poly- trauma). Furthermore, physically traumatic events are often embedded within a larger context, including exposure to psychological trauma, and service members are exposed to these types of recurring and relentless life- threatening events for extended periods of time (Vasterling et al. 2009). In addition to direct combat exposure, stressors unique to military per- sonnel within a war zone include episodes of extreme fear, exposure to the terrifying consequences of contemporary warfare, the lack of contemporary amenities and the comforts of daily life, and periods of boredom (King et al. 2008). Concerns about events at home may increase stress levels for deployed service members, and difficulties experienced during the transition from the war zone to home life may also increase the level of psychological distress (Vasterling et al. 2010). Combining TBI with repeated exposure to extreme stress and prolonged displacement from family, home, and com- munity can cause interactive psychiatric and neurological disorders. Al- though most service members readjust successfully to their predeployment lives, an estimated 26 percent of troops develop postdeployment mental health conditions such as depression and anxiety disorders (Adamson et al. 2008). A 2006 survey assessed the health of more than 200,000 active duty service members and veterans from the Army and Marine Corps (Hoge et al. 2006). The study found that approximately 20 percent of active duty service members screened positive for one mental health condition, and 31 percent of veterans had at least one outpatient mental health care visit within the first year after returning home from Iraq or Afghanistan (Hoge et al. 2006). According to a recent report screening service members return- ing from combat, among those that screened positive for TBI, 33.8 percent screened positive for PTSD and 31.8 percent screened positive for depres- sion (Adamson et al. 2008). Many of these deployment and postdeployment factors have the potential to influence the success of rehabilitation. CONCLUSION The factors described in this chapter may moderate an individual’s response to CRT. Furthermore, preinjury conditions, comorbidities, or en- vironmental features may differ between civilian and military populations with TBI. Preinjury depression and anxiety disorders may be present and contribute to persistent symptoms for anyone with TBI. However, more severe preinjury psychiatric disorders or substance abuse may be more common in civilians due to screening procedures used by the military. De- pression is a common comorbid condition in both civilian and military TBI. In contrast, PTSD is far more prevalent after blast-related TBI, and service members are more frequently exposed to blasts than civilians. Although social support and other environmental factors should be considered in
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70 COGNITIVE REHABILITATION THERAPY FOR TBI both civilian and military situations, the stressors associated with combat and deployment are typically more adverse than what is experienced in civilian life. Unfortunately, published literature evaluating how these factors may affect response to CRT is sparse. Clinical trials of CRT have not consis- tently reported the frequency of these conditions among study participants, nor have these studies consistently controlled for conditions that could os- tensibly interfere with treatment response. Even with limitations in knowl- edge, rehabilitation professionals must consider these potential conditions when planning treatment programs for patients with TBI. Likewise, future research on the benefit of CRT interventions for TBI may plan for these is- sues, which may benefit continued development and understanding of CRT and its ability to treat whole-person functioning. Chapter 14 of this report includes specific directions regarding these issues. REFERENCES Adamson, D. M., M. A. Burnam, R. M. Burns, L. B. Caldarone, R. A. Cox, E. D’Amico, C. Diaz, C. Eibner, G. Fisher, T. C. Helmus, T. Tanielian, B. R. Karney, B. Kilmer, G. N. Marshall, L. T. Martin, L. S. Meredith, K. N. Metscher, K. C. Osilla, R. L. Pacula, R. Ramchand, J. S. Ringel, T. L. Schell, J. M. Sollinger, L. H. Jaycox, M. E. Vaiana, K. M. Williams, and M. R. Yochelson. 2008. Invisible Wounds of War: Psychological and Cognitive Injuries, Their Consequences, and Services to Assist Recovery. Edited by T. Tanielian and L. H. Jaycox. Santa Monica: RAND Corporation. Albert, S. M., A. Im, L. Brenner, M. Smith, and R. Waxman. 2002. Effect of a social work liaison program on family caregivers to people with brain injury. Journal of Head Trauma Rehabilitation 17(2):175–189. APA (American Psychiatric Association). 2000. Diagnostic and Statistical Manual of Mental Disorders. 4th ed. Washington, DC: American Psychiatric Association. Ayalon, L., K. Borodkin, L. Dishon, H. Kanety, and Y. Dagan. 2007. Circadian rhythm sleep disorders following mild traumatic brain injury. Neurology 68(14):1136–1140. Baumann, C. R., E. Werth, R. Stocker, S. Ludwig, and C. L. Bassetti. 2007. Sleep-wake disturbances 6 months after traumatic brain injury: A prospective study. Brain 130(7):1873–1883. Belmont, A., N. Agar, C. Hugeron, B. Gallais, and P. Azouvi. 2006. Fatigue and traumatic brain injury. Annales de Réadaptation et de Médecine Physique 49(6):283–288, 370–374. Blanchard, E. B., E. J. Hickling, A. E. Taylor, T. C. Buckley, W. R. Loos, and J. Walsh. 1998. Effects of litigation settlements on posttraumatic stress symptoms in motor vehicle ac- cident victims. Journal of Traumatic Stress 11(2):337–354. Bombardier, C. H., J. R. Fann, N. R. Temkin, P. C. Esselman, J. Barber, and S. S. Dikmen. 2010. Rates of major depressive disorder and clinical outcomes following traumatic brain injury. Journal of the American Medical Association 303(19):1938–1945. Brown, R., K. Pain, C. Berwald, P. Hirschi, R. Delehanty, and H. Miller. 1999. Distance edu- cation and caregiver support groups: Comparison of traditional and telephone groups. Journal of Head Trauma Rehabilitation 14(3):257–268. Bryant, R. A., and A. G. Harvey. 1999. Postconcussive symptoms and posttraumatic stress disorder after mild traumatic brain injury. Journal of Nervous & Mental Disease 187(5):302–305.
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