A brain concussion is a still incompletely defined syndrome of traumatic brain injury (TBI) that causes a spectrum of symptoms without evident structural damage to the brain. A headache, cognitive deficits, emotional instability, sleep disturbances, and an overall change in mental state after trauma are highly suggestive signs of a concussion. Through several tests, the diagnosis is primarily made on clinical grounds, whereas imaging studies may be used to rule out more severe forms of injury.
Presentation
Because the definition of a concussion denotes a mechanical injury of the brain without visible structural damage on imaging studies, the physician makes the diagnosis solely on clinical criteria and the findings from the clinical presentation [1] [2] [3] [4]. Head trauma prior to the onset of symptoms is a mandatory step in the development of a concussion and headaches, often accompanied by dizziness, are described as the two most frequent findings in these individuals [1] [2] [3] Nausea, vomiting, and changes in the state of consciousness can be encountered as well [1] [2] [5]. Furthermore, a concussion is known for producing various neurological changes that are primarily related to behavior and cognition - emotional lability, depression, and irritability are main patterns of mood disorders, whereas forgetfulness, memory loss, transient amnesia, reduced reaction times, and deficits in attention might also be present [1] [2] [3] [4] [5]. Visual impairment and a sense of numbness are reported by some studies, whereas altered sleep may eventually appear in the form of insomnia [1] [2] [3] [4]. In rare cases, convulsions and significant motor deficits right after head trauma can constitute the clinical picture of a concussion [1] [2].
Workup
The diagnostic workup of cases in whom a concussion is suspected must encompass a detailed history and a thorough physical examination [1] [2] [4]. The physician must determine the exact events that preceded the onset of complaints and exclude their presence prior to head trauma, as the clinical presentation could be similar to exercise-induced fatigue and consequent headaches or migraines [1] [2]. If the initial injury occurred days or weeks ago, patients should be asked about their sleeping patterns, whether they experience memory loss, or if new-onset epilepsy may have developed [1]. The physical examination is crucial for assessing the level of consciousness and awareness of the patient, but also for evaluating the cognitive status and other neurological insults that might have occurred. Because a concussion is currently classified as a form of traumatic brain injury (although this topic has become a matter of significant discussion) [6], imaging studies need to be employed in order to rule out more serious damage. Apart from the examination of the skull, plain radiography provides little benefit in patients with a suspected concussion, which is why computed tomography (CT) is used as the cornerstone of diagnostics [1] [2] [6]. Magnetic resonance imaging (MRI) and MR spectroscopy are used as even more advanced methods to reveal pathological changes in the brain that are not visible on CT [1] [2] [5].
Treatment
The primary treatment for a concussion is rest, both physical and cognitive. This means avoiding activities that require concentration and physical exertion until symptoms improve. Gradual return to normal activities is recommended, guided by a healthcare professional. Pain relief can be managed with over-the-counter medications like acetaminophen, but non-steroidal anti-inflammatory drugs (NSAIDs) should be avoided initially due to the risk of bleeding. Monitoring for worsening symptoms is crucial, as this may indicate a more serious condition.
Prognosis
Most individuals recover fully from a concussion within a few weeks, but some may experience prolonged symptoms, known as post-concussion syndrome. Recovery time can vary based on factors such as age, previous concussions, and the severity of the injury. Early and appropriate management is key to a good prognosis. Persistent symptoms may require specialized rehabilitation or therapy.
Etiology
Concussions are caused by a sudden impact or jolt to the head or body that causes the brain to move rapidly back and forth inside the skull. This movement can lead to chemical changes in the brain and sometimes damage brain cells. Common causes include sports injuries, falls, motor vehicle accidents, and physical assaults.
Epidemiology
Pathophysiology
The pathophysiology of a concussion involves complex changes at the cellular level. The rapid movement of the brain can cause stretching and shearing of neurons, leading to a temporary disruption in normal brain function. This can result in a cascade of metabolic and chemical changes, including alterations in neurotransmitter release and energy metabolism. These changes are typically reversible, but repeated concussions can lead to cumulative damage.
Prevention
Preventing concussions involves a combination of strategies, particularly in sports and high-risk activities. This includes wearing appropriate protective gear, such as helmets, and adhering to safety rules and guidelines. Educating athletes, coaches, and parents about the signs and symptoms of concussions is crucial for early recognition and management. In everyday life, measures such as fall-proofing homes and using seat belts can reduce the risk of concussions from accidents.
Summary
A brain concussion is a common and potentially serious injury resulting from a blow to the head or body. It can cause a range of symptoms, including headaches, confusion, and memory problems. Diagnosis is primarily clinical, and treatment focuses on rest and gradual return to activities. While most people recover fully, some may experience prolonged symptoms. Prevention strategies are essential to reduce the risk of concussions, especially in sports and high-risk environments.
Patient Information
If you suspect you or someone else has a concussion, it is important to seek medical evaluation. Symptoms can vary widely and may not appear immediately. Rest is crucial for recovery, and activities should be resumed gradually under medical guidance. Be aware of the signs of worsening symptoms, such as severe headaches, repeated vomiting, or confusion, which require immediate medical attention. Educating yourself about concussion risks and prevention can help protect you and your loved ones from this common injury.
References
- West TA, Marion DW. Current Recommendations for the Diagnosis and Treatment of Concussion in Sport: A Comparison of Three New Guidelines. J Neurotrauma. 2014;31(2):159-168.
- Giza CC, Kutcher JS, Ashwal S, et al. Summary of evidence-based guideline update: Evaluation and management of concussion in sports: Report of the Guideline Development Subcommittee of the American Academy of Neurology. Neurology. 2013;80(24):2250-2257.
- Shaw NA. The neurophysiology of concussion. Prog Neurobiol. 2002;67(4):281-344.
- Kutcher JS, Giza CC. Sports Concussion Diagnosis and Management. Continuum (Minneap Minn). 2014;20(6 Sports Neurology):1552-1569.
- Signoretti S, Lazzarino G, Tavazzi B, Vagnozzi R. The pathophysiology of concussion. PM R. 2011;3(10 Suppl 2):S359-368.
- Sharp DJ, Jenkins PO. Concussion is confusing us all. Pract Neurol. 2015;15(3):172-186.