Streiner summarized these principles in 2 main points: (1) that the natural history of the disorder is that these previously undetected problems will in fact become major ones if untreated and (2) that a treatment exists and is effective.7(p215) However, a third crucial principle is that a suitable test exists to confirm the suspected diagnosis if screening is positive. If these 3 conditions are not met, screening programs may do more harm than good.
Risks of screening
It is important to recognize that although screening may lead to an earlier diagnosis, not all screening programs have been shown to benefit the person being screened. Overdiagnosis, misdiagnosis, and creating adverse iatrogenic effects are some potential adverse effects of screening, in addition to unnecessary costs. Screening always results in some degree of false-positive responses, which, in turn, tend to result in (a) unnecessary tests and procedures, (b) anxiety and fears in the patient/family, and (c) potentially iatrogenic worsening of symptoms that are unrelated to the screened condition but tied to the “false screen” in the mind of providers and patients.
For example, after reviewing years of research and examining benefits and harms, recent recommendations have been put forth reversing longstanding screening practices using the prostate-specific antigen (PSA) test for prostate cancer. The PSA test was originally approved by the Food and Drug Administration in 1986 to monitor the progression of prostate cancer in men who had already have a diagnosis of the disease. In 1994, the Food and Drug Administration approved the use of the PSA test to screen asymptomatic men for prostate cancer. Since then until very recently, many doctors and professional organizations encouraged yearly PSA screening for men beginning at age 50. However, the rate of false-positive PSA screens is around 12% to 13%.9 Given the base rates of prostate cancer (about 17% of men in the United States will receive the diagnosis of prostate cancer in their lifetime), most men with an elevated PSA level turn out not to have prostate cancer. In fact, only about 25% of men who have a prostate biopsy following a positive PSA screen actually have prostate cancer.10
In 2011, the US Preventive Services Task Force (USPSTF) reviewed the literature and found evidence that the PSA screening process itself produces harm, including pain and discomfort associated with prostate biopsy and adverse psychological effects of false-positive test results. In addition, it found convincing evidence that treatment of prostate cancer detected by screening caused moderate to substantial harm, such as erectile dysfunction, urinary incontinence, bowel dysfunction, and death. These harms were seen as especially important because many men with prostate cancer who are treated would never have developed symptoms related to cancer during their lifetime.9 As a result, in 2012, the USPSTF recommended against PSA-based screening of men in the general US population, regardless of age.11
COMPLICATIONS IN SCREENING FOR MILD TBI
TBI is not a progressive disorder
Medical screening is generally done for early disease detection, typically of progressive disorders. In the realm of screening for mild TBI, a basic core criterion for screening is missing—TBI is not a progressive disorder. A TBI reflects an acute injury that typically improves with time. Deficits from a TBI may not completely resolve, but they are not expected to worsen over time, with the exceptions of acute medical complications such as subdural or epidural hematomas or subarachnoid bleeding, neither of which are relevant to VHA/DoD screenings. Treatment of injuries, including TBIs, are begun and often completed in the acute or post–acute phase. In the chronic phase, those who sustained a prior moderate to severe TBI (a) have noticeable difficulties without screening, (b) can typically accurately report a history of TBI, (c) have someone else who accompanies them report this information, or (d) have evidence of TBI documented in their medical records. Therefore, screening for moderate to severe TBI really is not needed.
As a result, it is really only for mild TBIs (ie, concussions) that screening is advocated or practiced. However, with mild TBI, screening is always going to be remote in time from the injury event. When presented with an acute concussion or mild TBI, medical providers do an assessment of the nature and extent of the injury, and if the evaluation is positive for a concussion, then acute concussion management is initiated. Acute concussion management is designed to ensure that any possible medical complications such as subdural or epidural hematomas or subarachnoid bleeding are identified and treated, if necessary, and to avoid the possibility of a second impact syndrome. However, following acute concussion management, what is the “natural history” of mild TBI?
By definition and based on diagnostic criteria, mild TBIs/concussions result in some initial brief loss or alteration of consciousness. Mild cognitive impairments, particularly mental processing speed and efficiency, attention/concentration, and memory difficulties are common in the initial hours after a mild TBI and not uncommon in the initial days or weeks postinjury. However, by 30 or fewer days after a mild TBI, cognitive functioning has returned to normal.12–14 Similarly, most individuals experience 1 or more postconcussive symptoms (eg, headaches, fatigue) immediately after their mild TBI. However, the sports concussion literature suggests that cognitive and symptom recovery occur rapidly and generally in parallel after injury.15
Our own work has found an association between a remote history of mild TBI and increased levels of current postconcussion-like symptoms.16–18 For example, in a Florida National Guard sample, those who sustained a deployment-related mild TBI were 2.5 times more likely to have a collection of postconcussion symptoms 31.8 months later compared to those without a history of mild TBI, even after controlling for other adverse experiences associated with combat and deployment, including blast exposure and other injuries. However, these same symptoms were 2.6 times higher in those who had other types of physical injuries during deployment and 3.1 times higher in those who were exposed to heavy combat experiences.18 Therefore, it is unknown whether mild TBI had any unique and direct causative effect for these symptoms or whether these deployment-related factors represent a common stress or injurious effect.
Nonetheless, this work and that of others indicate that a minority of those who sustained a mild TBI complain of various cognitive, psychological, and physical difficulties months and even years after injury, which they and healthcare providers sometimes attribute to mild TBI. Most of these postconcussion symptoms are indistinguishable from the diffuse, nonspecific symptoms experienced by many normal healthy individuals and symptoms that are at increased rates following periods of stress such as military combat situations. Although it is clear that several individuals have symptoms months and even years following a concussion, the available longitudinal literature indicates that these symptoms are unlikely to be related to the mild TBI19,20 and that the natural course is recovery.13,21 In a groundbreaking longitudinal study, symptoms were found to be unrelated to mild TBI and, instead, were associated with accompanying acute posttraumatic stress and depressive or anxiety disorders.21 Importantly, symptoms that presented acutely generally did not persist and not infrequently new symptoms appeared at follow-up.
Reliable confirmation of a TBI diagnosis after a positive screen is currently not possible
There is no definitive way to diagnose mild TBI in the post–acute or chronic phase. Reliance on self-report via a structured interview is the criterion standard but is fraught with difficulty. Potential monetary and psychological “rewards” complicate matters. Unlike physical diseases that have biological markers (eg, tumor cells, blood pathogens), mild TBI, though, clearly a physical injury, must be witnessed for verification and may even then be misdiagnosed. Neuroimaging in the emergency department is frequently normal,22 and in fact some definitions of mild TBI preclude neuroimaging abnormalities. Screening for a condition that inspires disagreement about its definition, and for which reliable diagnosis is virtually impossible, is ill advised.
Within VHA, the Comprehensive TBI Evaluation following a positive TBI screen is designed in part to confirm the diagnosis. Across facilities one would expect similar rates of TBI confirmation, given that all those evaluated begin with exactly the same positive screen. However, rates of confirmation vary from 19% to 93% (this includes only those sites who have completed more than 100 Comprehensive TBI Evaluations).23 Even among the 5 Polytrauma Rehabilitation Centers, which are seen as the centers of excellence, the TBI confirmation rates following a positive screen range from 50% to 76%. These figures should not be surprising, given that no reliable TBI confirmatory diagnostic test or procedure currently exists.
Effective treatment should exist for screened disorders, but no treatment exists for chronic mild TBI
Another major requirement for screening is that if a disorder or condition is identified, appropriate and effective treatment should exist for that condition.8 Given the natural history of mild TBI, if postconcussion-like symptoms exist in the chronic phase, they are most likely unrelated to mild TBI/concussion and far more likely to be related to other factors, particularly mental health conditions.21,24 The only demonstrated effective treatment is for acute mild TBI and that treatment is early psychoeducational and supportive interventions.
We have extensively reviewed the literature on nonpharmacological approaches to the treatment of postconcussive symptoms.25 Psychoeducational interventions for mild TBI include giving patients information about common symptoms following concussion, typical time course of symptoms, expectancy effects, relation of symptoms to stress, and strategies for symptom management and reattribution. These educational interventions in the acute phase have been shown to result in significantly shorter average symptom duration and significantly fewer symptoms at follow-up in civilians.26–28 Expectation management is key, using appropriate support, education, early symptom management, and a clear and consistent positive message of recovery over time.
However, as the existing literature is almost entirely civilian seen within days to weeks after injury, it is still unknown whether Veterans with combat-related mild TBI seen months to years postinjury and postcombat can benefit from this type of intervention. Without an evidence-based treatment, screening for chronic TBI is contraindicated.
Harms and costs outweigh benefits of mild TBI screening
A growing body of literature demonstrates the role of expectation in both cognitive performance and rate of symptom complaint. Simply drawing attention to the label “TBI” can cause increased symptom reporting and result in poorer cognitive performance.29–32 If there is an expectation of postinjury problems, then, in at least some individuals, such symptoms are more likely to be reported.30,33 In addition, since virtually everyone with a mild TBI experiences acute symptoms for minutes to hours, the mere presence of these symptoms can reinforce preexisting negative expectations and beliefs. Unfortunately, recent media attention has reported on concussions in the sports arena and in the military and associated mild TBI and multiple concussions with subsequent chronic traumatic encephalopathy, dementia, suicide, and other adverse long-term outcomes. As a result, it is understandable that both patients and providers may have somewhat catastrophic reactions to a positive screen for TBI.
In contrast, if there is no expectation of ongoing symptoms, then few or no ongoing symptoms are reported.29 Both brain dysfunction and expectation play independent and interactive causative roles.34 Given the current political climate, emphasis on TBI as the “signature injury” of the war on terror, and misinformed media attention on mild TBI leading to chronic traumatic encephalopathy, research regarding patient self-expectation is particularly pertinent. Merely by screening individuals within the context of increased societal attention on TBI, the stage is set for expectancies to exert an adverse influence on the patient's belief system with resulting increase in symptoms experienced and misattribution of many normal symptoms such as headaches, fatigue, and everyday memory slips to TBI. In addition, there may be an inclination by the patient to misattribute symptoms to TBI, rather than to treatable psychological conditions such as posttraumatic stress disorder and depression, given the perception that a physical brain injury is less “their fault” or under their control. Indeed, the structure and sequence of the screening questions, which combine the definition of mild TBI with acute and current symptoms, creates the impression that the mild TBI caused the symptoms.
In addition to the role of expectation, the screening process necessarily will inflate reporting. That is, patients who are not really troubled by their “symptoms” report them when asked during screening and subsequently undergo further evaluation for them. Research has clearly demonstrated that left to their own devices (or spontaneous report), people report far fewer symptoms than when queried in a more structured manner.35 Therefore, not only does a screening and evaluation process for mild TBI create some negative expectations but it may also create “problems” where none existed.
There is also the consideration of financial cost. While the screen itself is embedded in a variety of other postdeployment screens and therefore is of minimal additional cost, the subsequent evaluation and treatment process adds considerable cost. Because of the high sensitivity and low specificity of the screen,6 significant clinical resources are spent ruling out numerous false positives (44%). By screening all patients, even those who would not have otherwise presented at a clinic, and with a high false-positive rate, the system bears significant unnecessary costs. In addition, extra “cost” is likely created by TBI screening and medical evaluation-induced iatrogenesis noted earlier in the form of unnecessary treatments, healthcare visits, and lost work by patients. Because only 38.6% of those who screen positive for mild TBI receive a definitive diagnosis of TBI, screening for mild TBI is arguably quite a wasteful process. Importantly, more than 95% of veterans evaluated for TBI use VHA services after the evaluation, and those diagnosed with TBI used significantly more outpatient care.36 Whether that care actually resulted in better outcomes is unknown.
In addition, there is the cost to the larger Veterans Affairs system and to society in terms of disability compensation. In 2008, the Veterans Benefits Administration created a disability category for residuals of TBI that allows for assignment of up to 40% disability to those who report 3 or more subjective symptoms that interfere at least moderately with work, instrumental activities of daily living, or important social relationships. On the basis of our analyses of the VHA national data, approximately 70% of veterans screening positive for mild TBI report at least 3 symptoms at a level indicating moderate day-to-day functional impairment or worse during the Comprehensive TBI Evaluation following a positive screen. If disability benefits were provided on the basis of the level of medical symptom reporting during the Comprehensive TBI Evaluation, this would be a substantial cost to the system, given the high endorsement rate of symptoms.
The VHA and DoD are to be commended for attempting to make sure that Service Members and Veterans returning from deployment are offered whatever medical care they require. The benefit of postdeployment screening (TBI and other health and mental health screens) is to identify and treat problems (regardless of etiology one might argue). Given that the primary focus of the TBI screen is on nonspecific symptoms, and given the unknown etiology of these symptoms, a problem-centric, symptom-based approach is likely most prudent. Such an approach is laid out in the VA/DoD Clinical Practice Guidelines for concussion/mild TBI.37 Primary care or postdeployment clinics are well suited and equipped to identify and treat or triage such troubling symptoms of unknown etiology.
In reviewing potential benefits and costs/harms of screening for mild TBI, as shown in Table 2, the potential costs/harms outnumber the potential benefits. Furthermore, some of the benefits assume that the underlying conditions of useful screening, as reviewed earlier, have been met (eg, that mild TBI is a progressive condition and that proactive treatment is a good thing because effective treatment exists). Unfortunately, as has already been illustrated, these assumptions for screening are not met with regard to screening for mild TBI.
SUMMARY AND RECOMMENDATIONS
On the basis of generally accepted medical screening principles and assumptions, screening for mild TBI is unnecessary at best and potentially harmful at worst. The conditions for beneficial medical screening—progressive disease, symptoms related to the identified disease, suitable tests or examinations for accurate diagnosis, and accepted and effective treatment—are simply not met. Because nonspecific postconcussion-like symptoms can be effectively treated in a symptom specific manner, tying them to concussion (which in the chronic phase is highly unlikely) through a screening and evaluation process is wasteful and potentially harmful. This is not to say that screening for other high probability postdeployment conditions such as depression, posttraumatic stress disorder, or substance use disorders may not be beneficial. However, the same type of medical screening criteria and harm/cost/benefit analyses should be undertaken to ensure that such screening programs are likely to be effective and beneficial.
In order to assure that patients with significant subjective functionally impairing problems continue to be identified and referred for appropriate care, symptom and behaviorally-based post-deployment healthcare screens, not directly tied to diagnostic disorders, could be implemented. As now, these positive screens could then be referred for follow-up evaluations and treatment in post-deployment primary care clinics or polytrauma clinic settings, depending upon the nature of the positive symptom complaints. Screens would identify problems associated with chronic deployment stress and post-deployment adjustment, rather than unconfirmed diagnostic conditions. Nonspecific postconcussive-like symptoms could be effectively treated in a symptom-specific manner, rather than incorrectly tying them to concussion.
1. Post-Deployment Health Group. Analysis of VA Health Care Utilization among Operation Enduring Freedom (OEF), Operation Iraqi Freedom (OIF), and Operation New Dawn (OND) Veterans. Vol 2012. Washington, DC: Office of Public Health, Veterans Health Administration; 2012.
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3. Terrio H, Brenner LA, Ivins BJ, et al. Traumatic brain injury screening: preliminary findings in a US Army Brigade Combat Team. J Head Trauma Rehabil. 2009;24:14–23.
4. Sayer NA, Nelson D, Nugent S. Evaluation of the Veterans Health Administration traumatic brain injury screening program in the upper Midwest. J Head Trauma Rehabil. 2011;26:454–467.
5. Belanger HG, Vanderploeg RD, Soble JR, Richardson M, Groer S. Validity of the Veterans Health Administration's traumatic brain injury screen. 2012;93:1234–1239.
6. Donnelly KT, Donnelly JP, Dunnam M, et al. Reliability, sensitivity, and specificity of the VA traumatic brain injury screening tool. J Head Trauma Rehabil. 2011;26:439–453.
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8. Wilson JMG, Jungner G, eds. Principles and Practice of Screening for Disease. Geneva, Switzerland: World Health Organization; 1968.
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11. Moyer VA. Screening for prostate cancer: U.S. Preventive Services Task Force recommendation statement. Ann Intern Med. 2012;157:120–134.
12. Belanger HG, Curtiss G, Demery JA, Lebowitz BK, Vanderploeg RD. Factors moderating neuropsychological outcomes following mild traumatic brain injury: a meta-analysis. J Int Neuropsychol Soc. 2005;11:215–227.
13. Belanger HG, Vanderploeg RD. The neuropsychological impact of sports-related concussion: a meta-analysis. J Int Neuropsychol Soc. 2005;11:345–357.
14. Schretlen DJ, Shapiro AM. A quantitative review of the effects of traumatic brain injury on cognitive functioning. Int Rev Psychiatry. 2003;15:341–349.
15. McCrea M, Guskiewicz KM, Marshall SW, et al. Acute effects and recovery time following concussion in collegiate football players: the NCAA Concussion Study. JAMA. 2003;290:2556–2563.
16. Vanderploeg RD, Curtiss G, Luis CA, Salazar AM. Long-term morbidities following self-reported mild traumatic brain injury. J Clin Exp Neuropsychol. 2007;29:585–598.
17. Vanderploeg RD, Belanger HG, Curtiss G. Mild traumatic brain injury and posttraumatic stress disorder and their associations with health symptoms. Arch Phys Med Rehabil. 2009;90:1084–1093.
18. Vanderploeg RD, Belanger HG, Horner RD, et al. Health outcomes associated with military deployment: mild traumatic brain injury, blast, trauma, and combat associations in the Florida National Guard. Arch Phys Med Rehabil. 2012;93(11):1887–1895.
19. Meares S, Shores EA, Taylor AJ, et al. Mild traumatic brain injury does not predict acute postconcussion syndrome. J Neurol Neurosurg Psychiatry. 2008;79:300–306.
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21. Meares S, Shores EA, Taylor AJ, et al. The prospective course of postconcussion syndrome: the role of mild traumatic brain injury. Neuropsychology. 2011;25:454–465.
22. Borg J, Holm L, Cassidy JD, et al. Diagnostic procedures in mild traumatic brain injury: results of the WHO Collaborating Centre Task Force on Mild Traumatic Brain Injury. J Rehabil Med. 2004;43(suppl):61–75.
23. Cifu DX. Co-morbidities 101: putting it in perspective. Paper presented at: VHA Polytrauma Conference; 2010; Orlando, FL.
24. Donnell AJ, Kim MS, Silva MA, Vanderploeg RD. Incidence of postconcussion symptoms in psychiatric diagnostic groups, mild traumatic brain injury, and comorbid conditions. Clin Neuropsychol. 2012;26:1092–1101.
25. Belanger HG, Donnell AJ, Vanderploeg RD. Special issues with mild TBI in veterans and active duty service members. In: Sherer MS, A, eds. Handbook on the Neuropsychology of Traumatic Brain Injury. New York, NY: Springer; in press.
26. Mittenberg W, Canyock EM, Condit D, Patton C. Treatment of postconcussion syndrome following mild head injury. J Clin Exp Neuropsychol. 2001;23:829–836.
27. Ponsford J, Willmott C, Rothwell A, et al. Impact of early intervention on outcome following mild head injury in adults. J Neurol Neurosurg Psychiatry. 2002;73:330–332.
28. Mittenberg W, Tremont G, Zielinski RE, Fichera S, Rayls KR. Cognitive-behavioral prevention of postconcussion syndrome. Arch Clin Neuropsychol. 1996;11:139–145.
29. Ferguson RJ, Mittenberg W, Barone DF, Schneider B. Postconcussion syndrome following sports-related head injury: expectation as etiology. Neuropsychology. 1999;13:582–589.
30. Mittenberg W, DiGiulio DV, Perrin S, Bass AE. Symptoms following mild head injury: expectation as aetiology. J Neurol Neurosurg Psychiatry. 1992;55:200–204.
31. Suhr JA, Gunstad J. Further exploration of the effect of “diagnosis threat” on cognitive performance in individuals with mild head injury. J Int Neuropsychol Soc. 2005;11:23–29.
32. Pavawalla S, Salazar R, Cimino C, Belanger H, Vanderploeg R. An exploration of diagnosis threat and group identification following concussion injury [published ahead of print January 8, 2013]. J Int Neuropsychol Soc. doi:10.1017/S135561771200135X.
33. Whittaker R, Kemp S, House A. Illness perceptions and outcome in mild head injury: a longitudinal study. J Neurol Neurosurg Psychiatry. 2007;78:644–646.
34. Vanderploeg RD, Belanger HG, Curtiss G. Mild traumatic brain injury: medical and legal causality considerations. In: Young G, Kane A, Nicholson K, eds. Psychological Knowledge in Court: PTSD, Pain and TBI. New York, NY: Springer; 2006:279–307.
35. Iverson GL, Brooks BL, Ashton VL, Lange RT. Interview versus questionnaire symptom reporting in people with the postconcussion syndrome. J Head Trauma Rehabil. 2010;25:23–30.
36. Amara JH, Hendricks AM, Gardner JA, Lew HL. Determinants of cost and utilization of VA health care services by OEF/OIF veterans with a focus on TBI. Paper presented at: Third Federal Interagency Conference on Traumatic Brain Injury; 2011; Washington, DC.
37. Department of Veterans Affairs and Department of Defense. VA/DOD Clinical Practice Guideline for Management of Concussion/Mild Traumatic Brain Injury. Vol 2009. Washington, DC: Department of Veterans Affairs and Department of Defense; 2009.
*The first author of this commentary was part of the workgroup that developed the screening questions and procedures for VHA TBI screening.
Keywords:Copyright © 2013 Wolters Kluwer Health, Inc. All rights reserved.
mass screening; TBI; US Department of Defense; US Veterans Administration