Useful Markers to Assess Traumatic and Hypoxic Brain Injury
Total Page:16
File Type:pdf, Size:1020Kb
Rom J Leg Med [25] 146-151 [2017] DOI: 10.4323/rjlm.2017.146 © 2017 Romanian Society of Legal Medicine FUNDAMENTAL RESEARCH Useful markers to assess traumatic and hypoxic brain injury Violeta Ionela Chirica1,* _________________________________________________________________________________________ Abstract: Traumatic Brain Injury, TBI, is a very important health issue world wide. Many traumatic events are not witnessed and not declared, especially in mild TBI, mTBI, and therefore not known, not treated or cured. At autopsy the diagnosis of brain injury is in many cases a challenge especially in children with physical abuse. Quite often the judicial system ask for scientific proofs of objectivity in determining the cause of death in head trauma. Sometimes legal medicine is called to determine the extent of the brain injuries following anoxia or hypoxia after a CA resuscitated. Pathology and anatomic pathology sometimes may offer important clues for diagnosis but often there are time consuming. The use of biomarkers in predictive way for prognosis and for diagnosis is a very potent and useful tool in legal medicine. Some of the brain injury biomarkers express the integrity of neurons or neurologic network, including astrocytes, and therefore express the structural integrity of the nervous system. The cutoff limit of these markers is in scientific debates and legal medicine may offer a support for their research. Some biomarkers are studied and presented such as biofluid biomarkers of astroglial injury, S100Beta, Glial Fibrillary acid protein (GFAP), biofluid biomarkers of neuronal injury, Neuron-specific enolase (NSE), Ubiquitin C-terminal hydrolase-L1 (UCH-L1), CK0BB, Brain-derived neurotrophic factor, BDNF, Biofluid biomarkers of axonal injury, Alpha-II spectrin, Tau protein, Neurofilaments, N-Cam or selectins. Biomarkers could potentially facilitate diagnosis and risk stratification of mTBI and impact management of these patients as much as the diagnosis of TBI in legal medicine practice and in justice. Key Words: traumatic brain injury, biomarkers, predictive value, diagnosis. INTRODUCTION physical abuse. Quite often the judicial system ask for scientific proofs of objectivity in determining the cause Traumatic brain injury, TBI, occurs when an of death in head trauma. Sometimes legal medicine external mechanical force causes brain dysfunction. It is called to determine the extent of the brain injuries results usually results from a violent blow to the head. following anoxia or hypoxia after a CA resuscitated. Mild traumatic brain injury may cause temporary Pathology and anatomic pathology sometimes may dysfunction of brain cells. More serious traumatic offer important clues for diagnosis but often there are brain injury can result in cerebral bruising (cerebral time consuming. contusion), torn tissues (cerebral laceration), bleeding The use of biomarkers in predictive way for (intracranial hematoma), cerebral edema, that can prognosis and for diagnosis is a very potent and result in long-term complications or death. useful tool in legal medicine. Some of the brain Traumatic Brain Injury is a very important injury biomarkers express the integrity of neurons or health issue world wide. Many traumatic events are neurologic network, including astrocytes, and therefore not witnessed and not declared, especially in mild TBI, express the structural integrity of the nervous system. mTBI, and therefore not known, not treated or cured. The cutoff limit of these markers is in scientific debates At autopsy the diagnosis of brain injury is in and legal medicine may offer a support for their research. many cases a challenge especially in children with 1) “Carol Davila” University of Medicine and Pharmacy, Discipline of Legal Medicine and Bioethics, Bucharest, Romania * Corresponding author: E-mail: [email protected] 146 Romanian Journal of Legal Medicine Vol. XXV, No 2(2017) Trauma lesions of the brain The signs and symptoms of mild traumatic brain The following traumatic lesions are to be found: injury may include: (1) physical symptoms such as: no Closed Head Injury, Open Head Injury, Diffuse Axonal loss of consciousness, daze state, loss of consciousness Injury, Contusion, Penetrating Trauma, Secondary seconds to minutes, headache, nausea, vomiting, sleeping, Injury (Intracranial hemorrhage -bleeding inside the dizziness, (2) sensory symptoms: blurred vision, ringing skull-, Brain swelling, Increased intracranial pressure in the ears, sensitivity to light (3) cognitive or mental -pressure inside the skull-, Brain damage associated with symptoms: memory and mood problems. lack of oxygen, Infection inside the skull, common with The signs and symptoms of moderate to severe penetrating trauma, Chemical changes leading to cell traumatic brain injuries include: (1) physical symptoms death, Increased fluid inside the skull –hydrocephalus-). such as: loss of consciousness minutes to hours, persistent Acquired Brain Injury may be non-traumatic headache, repeated vomiting, convulsions, inability to with the brain usually diffusely injured (congenital, birth awaken, loss of coordination, (2) cognitive or mental trauma, hereditary or degenerative) or traumatic brain symptoms: profound confusion, slurred speech, coma. injury. Common causes are anoxia and hypoxia leading Mechanisms are: Open head Injury, Closed Head to insufficient/lack of oxygen to the brain because of Injury, Deceleration Injuries, Chemical/Toxic, Hypoxia, mechanical problems with breathing, cardiac arrest or Tumors, Infections and Stroke. bleeding, Drugs and poisoning (i.e. carbon monoxide Several complications varying from mild to poisoning)[1]. severe and more severe can occur immediately or soon In many cases the use of the terms brain injury after a traumatic brain injury: Altered consciousness and head injury are used interchangeably. Head injury is a (Coma, Vegetative, Minimally conscious state, Locked- trauma to the head, that may or may not include injury to in syndrome, Brain death), Seizures, Cerebrospinal the brain. A brain injury can be called an acquired brain fluid buildup and cerebral oedema, Infections, Blood injury, intracranial injury, or simply head injury, and vessel damage, Nerve damage, Intellectual problems occurs when a sudden trauma causes damage to the brain. (Cognitive problems, Executive functioning problems, Common causes of both head and brain injuries Communication problems: Cognitive problems, Social include vehicle accidents, home and occupational problems, Behavioral changes, Emotional changes, accidents, falls, and assaults. Sensory problems, Degenerative brain diseases). Since in Loss of consciousness is not a must in the our brain are our personality, mood, character and this traumatic brain injury, thus many people with TBI, defines who we are, the consequences of a brain injury especially mild TBI, do not seek help and therefore can affect all aspects of our lives. doctors are not really aware of the extend of this pathology in general population [2]. Useful markers to assess TBI (Traumatic brain There are an estimated 10 million people affected Injury) annually by TBI across the globe [3]. The medical staff may conduct a number of According to the World Health Organization, TBI diagnostic tests to determine what is occurring internally will surpass many diseases as the major cause of death and after the accident or illness such as intracranial pressure, disability by the year 2020 [3]. X-rays, CT, MRI, EEG, Coma Glasgow scale evaluation. TBI is classified into mild, moderate, and severe However, CT scanning has low sensitivity to diffuse brain based on the Glasgow Coma Scale (GCS) score as a damage and confers important exposure to radiation. spectrum of injuries: a GCS equal to or less than 8 is MRI is indeed very useful to evaluate the extent of considered a “severe” TBI, a GCS of 9–12 is a “moderate” diffuse injuries but is not welcomed by all patients and is TBI, and a GCS of 13–15 is considered mild TBI, mTBI. restricted by its reduce availability and high costs. Unfortunately the term “mild TBI” coin a not dangerous Brain injury may be identifiable also using brain traumatic lesion which is not actually true [2]. biomarkers. The most frequent used are NSE (neuron- Individuals who incur a TBI and have an initial specific enolase) and S100B which are released after the GCS score of 13–15 are acutely at risk for intracranial head and brain trauma and injury in the cerebrospinal bleeding and diffuse axonal injury [4]. fluid and then in the blood. Other biomarkers may be Additionally, a significant proportion is at risk useful especially if their results are correlated with the for impairment of physical, cognitive, and psychosocial clinical status and exploratoty investigations such as MRI functioning [5-9]. and CT. Axonal injury, term coined diffuse axonal injury (DAI), more recently traumatic axonal injury (TAI) Biofluid biomarkers of astroglial injury [10] can be found after severe, moderate and mild TBI, 1. S100Beta by rotation mechanisms after rapid acceleration and S100 is a dimer which binds Calcium in the cell. deceleration forces, usually in road vehicle accidents but It is implied in the neuronal and cellular differentiation not solely. and neuronal proliferation. S100 has a half life of 2 hours. 147 Chirica V.I. Useful markers to assess traumatic and hypoxic brain injury There are more than 19 types: 4 types are within the Roine et al. sustain a cutoff of 17 microgr/L useful tissues i.e. S100A1 in the skeletal