The following symptomatology is found in patients suffering in traumatic head injuries:

• General Appearance: Patients are usually brought to the emergency room with loss of consciousness due to severe brain trauma. Less severe cases can present with confusion, drowsiness and disorientation. 
• Head and neck: Headache and nausea is a usual symptom of increased intracranial pressure. Vision is usually blurred with tinnitus of the ear due to cranial nerve damage. 
• Chest and heart: Tachyarrhythmia may be caused by secondary subarachnoid bleeding due to traumatic brain injury.
• Abdomen: Intractable vomiting may be an outward sign of nausea. 
• Extremities: Spasticity and rigidity of all four extremities may be evident during significant cerebral and cerebellar injuries.
• Neurologic: Patients may present with dizziness and loss of balance due to cranial nerve impairment or damage to the middle ear. 

• Unconsciousness

  An adult male had an accidental fall which rendered him unconscious. This was followed by diplopia and restricted ocular motility. He received supportive medical therapy. He was examined for systemic medical and ophthalmic findings. [ncbi.nlm.nih.gov]

  Mild traumatic brain injury, also known as a concussion, either doesn’t cause unconsciousness or unconsciousness lasts for 30 minutes or less. [alz.org]

  Severe head injury is usually defined as being a condition where the patient has been in an unconscious state for six hours or more, or a post-traumatic amnesia of 24 hours or more. [headway.org.uk]

• Pain

  Drowsiness, high-grade fever, severe headache, left ocular pain with marked periorbital swelling, and paralysis of extraocular eye movements developed. [ncbi.nlm.nih.gov]

  Third (eye) Vision Problems Fourth (eye) Vision Problems Fifth (face) Trigenial-injury can create an ultra painful condition in the face, usually an electrical type burst of pain on contact with the face. [braininjury.com]

  Glasgow Coma Scale Eye Opening Spontaneous 4 To loud voice 3 To pain 2 None 1 Verbal Response Oriented 5 Confused, Disoriented 4 Inappropriate words 3 Incomprehensible words 2 None 1 Motor Response Obeys commands 6 Localizes pain 5 Withdraws from pain [medicinenet.com]

• Fatigue

  Cognitive fatigue Cognitive fatigue is a common problem that can happen after a head injury. [rch.org.au]

  Symptoms may include clumsiness, fatigue, confusion, nausea, blurry vision, headaches, and others. Mild concussions are associated with sequelae. [en.wikipedia.org]

  […] syndrome may include: Headaches Irritability Feelings of dizziness Restlessness Nausea Impulsivity and self-control problems Sensitivity to light Difficulties with concentration Sensitivity to noise Feeling depressed, tearful, anxious Sleep disturbance Fatigue [headway.org.uk]

  They may include, as an adult, attention deficit and fatigue, impaired planning and problem solving, lack of initiative, inflexibility, impulsiveness, irritability and temper tantrums, opposition, and socially inappropriate behavior. [braininjury.com]

  Common Symptoms of Mild TBI: Fatigue Headaches Visual disturbances Memory loss Poor attention/concentration Sleep disturbances Dizziness/loss of balance Irritability-emotional disturbances Feelings of depression Seizures Other Symptoms Associated with [traumaticbraininjury.com]

• Noncompliance

  Among the noncompliant group, head CT was overperformed for 20.1% and underperformed for 8.6% of patients. [ncbi.nlm.nih.gov]

• Vomiting

  Any vomiting episodes since the injury (clinical judgement should be used in those aged 12 years). Any seizure since the injury. Irritability or altered behaviour, particularly in infants and young children. [patient.info]

  She developed watery rhinorrhea, progressive headache, fever, nausea, vomiting, and left proptosis with blurred vision, and was admitted to hospital 3 days after injury. [ncbi.nlm.nih.gov]

• Nausea

  She developed watery rhinorrhea, progressive headache, fever, nausea, vomiting, and left proptosis with blurred vision, and was admitted to hospital 3 days after injury. [ncbi.nlm.nih.gov]

  They can include nausea, headaches, dizziness, impaired concentration, memory problems, extreme tiredness, intolerance to light and noise, and can lead to anxiety and depression. [headway.org.uk]

  Symptoms of bleeding in the brain, which may gradually worsen or suddenly appear, include: sudden severe headache seizures nausea or repeated vomiting lethargy weakness in an arm or leg loss of consciousness. [radiologyinfo.org]

  Head and neck: Headache and nausea is a usual symptom of increased intracranial pressure. Vision is usually blurred with tinnitus of the ear due to cranial nerve damage. [symptoma.com]

• Blurred Vision

  She developed watery rhinorrhea, progressive headache, fever, nausea, vomiting, and left proptosis with blurred vision, and was admitted to hospital 3 days after injury. [ncbi.nlm.nih.gov]

  vision and sensitivity to light slurred speech or saying things that don't make sense problems concentrating, thinking, or making decisions difficulty with coordination or balance (such as being unable to catch a ball or other easy tasks) feeling anxious [kidshealth.org]

  vision, or blind spots) Drainage of clear fluid (cerebrospinal fluid) from the nose or ear Severe headache [merckmanuals.com]

• Tinnitus

  Vision is usually blurred with tinnitus of the ear due to cranial nerve damage. Chest and heart: Tachyarrhythmia may be caused by secondary subarachnoid bleeding due to traumatic brain injury. [symptoma.com]

  Huffing American Tinnitus Assoc: Ringing in the ears - Information, resources and support. Vestibular Disorders Assoc: Dizziness or Vertigo - Information, resources, and support. [headinjury.com]

  […] the scalp Headache Sensitivity to noise and light Irritability Confusion Lightheadedness and/or dizziness Problems with balance Nausea Problems with memory and/or concentration Change in sleep patterns Blurred vision "Tired" eyes Ringing in the ears (tinnitus [m.hopkinsmedicine.org]

  I suffer with intermittent bouts of depression, varying degrees of anxiety and paranoia, continuous headaches, with extreme light sensitivity, spontaneous loss of balance, motion sickness, and continuous severe tinnitus. [irlen.com]

• Aggressive Behavior

  Difficulty with concentration Short-term memory loss Interference with long-term memory Aggressive behavior Change in sexual interest Persistent talking (damage to right lobe) Difficulty locating objects in environment. [headinjury.com]

  Aggressive Behaviors Provided a situation does not present a physical threat, various approaches may be used to diffuse hostile behavior: Remain as calm as you can; ignore the behavior. [caregiver.org]

  This research associates TBI with a range of psychiatric disorders, including depression and aggressive behavior. Hesdorffer, D. C., Rauch, S. L. Tamminga, C. A. (2009). [pbs.org]

• Headache

  BACKGROUND: Headache is the most frequent symptom following head injury, but long-term follow-up of headache after head injury entails methodological challenges. [ncbi.nlm.nih.gov]

  The most common recognizable forms of posttraumatic headache in concussion are tension-type headache, cervicogenic headache, migraine, and combined tension-type headache and migraine. [doi.org]

  They can include nausea, headaches, dizziness, impaired concentration, memory problems, extreme tiredness, intolerance to light and noise, and can lead to anxiety and depression. [headway.org.uk]

  The classic presentation of subarachnoid hemorrhage is the sudden onset of a severe headache (a thunderclap headache). This can be a very dangerous entity, and requires emergent neurosurgical evaluation, and sometimes urgent intervention. [en.wikipedia.org]

• Seizure

  The child was admitted several times with breakthrough seizures. Over time the seizures became refractory to treatment. [ncbi.nlm.nih.gov]

• Confusion

  More than half (56%) screened positive for mTBI, defined as at least one instance in which they experienced a change in consciousness or a period of being dazed and confused as a result of a head injury. [ncbi.nlm.nih.gov]

  The effects of concussion can leave people with symptoms including dizziness, nausea, confusion or an inability to process or retain information, sensitivity to light, and vision distortion. [headway.org.uk]

  Seems weak or confused, or seems to have problems with coordination, vision, or verbal communication. Can a concussion cause permanent brain damage? Only in rare cases. [babycenter.com]

  Effects of concussion are usually temporary, but can include altered levels of consciousness, headaches, confusion, dizziness, memory loss of events surrounding the injury, and visual disturbance. [rch.org.au]

  If a fellow player has signs of being confused or a sudden loss of coordination, be sure to report this to a coach. [webmd.com]

• Dizziness

  They can include nausea, headaches, dizziness, impaired concentration, memory problems, extreme tiredness, intolerance to light and noise, and can lead to anxiety and depression. [headway.org.uk]

  OBJECTIVE: We hypothesised that chronic vestibular symptoms (CVS) of imbalance and dizziness post-traumatic head injury (THI) may relate to: (i) the occurrence of multiple simultaneous vestibular diagnoses including both peripheral and central vestibular [ncbi.nlm.nih.gov]

  Are they nauseous or dizzy? Can they remember what happened before and during the injury? Do they have a headache? Are they confused? In a severe head injury you may also find: They are less responsive. [patient.info]

• Amnesia

  Post-traumatic amnesia in a worker presenting with head trauma must be recognised by coworkers, so the cause of injury can be elicited early and the victim gets timely medical help. [ncbi.nlm.nih.gov]

  Concussion: symptoms of amnesia and confusion. Duration of amnesia is predictive of injury severity. Other symptoms include dizziness, headaches, poor concentration, nausea, and vomiting. [patient.info]

  A moderate head injury is defined as loss of consciousness for between 15 minutes and six hours, or a period of post-traumatic amnesia of up to 24 hours. [headway.org.uk]

  This rule can only be applied to patients with LOC/Amnesia or changes in mental status. [mdcalc.com]

A comprehensive clinical history and a thorough physical and neurologic examination may be all that is needed to diagnose traumatic head injuries. The following laboratories and tests may be helpful in the diagnosis and management of the traumatic brain injuries:

• Glasgow Coma Scale: A 15 point scale that determines the level of consciousness of patients with head injury
• Intracranial monitoring device: Inserted in the skull to monitor the actual intracranial pressure
• Imaging: Computerized tomography can easily visualize skull fractures, intracranial bleeding, brain contusions, brain swelling and hematoma formation. Magnetic resonance imaging can demonstrate a more detailed view of the brain structures.

Mild traumatic head injury may not require any treatment. Patients are usually advised adequate rests and may be given pain relievers to treat symptoms of headache. However, patients sustaining severe head injuries with altered state of consciousness and unstable vital signs may need immediate emergency care.

Medical management with osmotic diuretics and anti-seizure drugs may be given to allay the symptoms of severe traumatic head injury. Medical decompression of the CSF using mannitol and vasopressors can maintain cerebral perfusion pressures to at least 70 mmHg ensuring undisrupted blood supply to important cortical structures [10].

Neurosurgical approaches to traumatic head injury include craniotomy and the removal of hematoma, primary repair of skull fractures, or burr hole craniotomy to relieve the pressure in the brain. Rehabilitation treatment with physiatrists, occupational therapists and neuropsychologists are an essential part of post-hospital and post-surgical care of patients.

In general, traumatic head injury prognosis worsens with the relative increase and extent of brain injury. Patients presenting at a Glasgow Coma Score (GCS) of 3 within the first 24 hours carries a 65% mortality rate [8]. The presence of subdural hematoma in patients with head injury varies inversely with the GCS score in terms of prognostic outcome and mortality rate [9]. The clinical condition of patients whether they are conscious and coherent or whether they are in a vegetative state may correlate closely with their prognosis.

Complications

Many complications can occur immediately or a few minutes after the traumatic head injury. The severity of the head injury increases the risk for permanent brain complications and more severe brain complications. The following complications are seen in patients suffering from traumatic head injuries:

• Altered state of consciousness
• Seizures or traumatic epilepsy
• Brain swelling
• Meningitis 
• Cerebral vascular damage
• Neuropathies
• Intellectual problems
• Communication difficulties
• Degenerative brain disorders

The following common events may result in traumatic brain injury among patients:

• Falls: This is the most cause on traumatic head injury in young adults and older patients. This includes falling in a flight of stairs, falling from a ladder, and slipping in a bath. 
• Vehicular accidents: This usually involves pedestrians colliding with motorcycling, bicycle, and automobiles. 
• Armed conflict: Domestic violence like gunshot wounds to the head represents 20% of all traumatic head injuries. 
• Sports injuries: Traumatic head injuries may be caused in certain sports like soccer, boxing, football, baseball, hockey and other high impact sports activities.
• Explosive blast or combat injuries: This type of injuries affects those in active military service especially those who sustain a grenade shrapnel injury or a blast from an explosive charge that damages the brain cells. 

In the United States, head injuries numbers to 1.5 million cases annually and three-fourths of which are classified as mild injuries. The relative incidence of head injuries in the Americas has reached 503 cases per 100,000 population with predominance among Native Americans. The incidence of elderly cases of traumatic injury deaths and hospitalizations in the United States has doubled that of the national average in 2003 [2].

In European countries, the rate of head injuries reaches a level of 91 cases per 100,000 cases annually. The exact incidence of traumatic injury may be hard to ascertain because patients who suffer brain dysfunctions with temporal amnesia will have difficulty in recalling the accounts of his head trauma in the emergency room [3].

The Center of Diseases and Control (CDC) has conveyed that more than 50,000 die each year due to traumatic head injuries and almost 100,000 incur permanent disability due to the said injury.

Afro-Americans races have an associated worse outcome of traumatic head injury compared to their white counterparts. There is a male preponderance for traumatic head injury in over two folds the risk compared to females worldwide. More than half of traumatic head injury worldwide is aged 24 years or younger.

The pathophysiology of traumatic head injury is conveniently divided into three brain insults namely: Structural traumatic insults, neurochemical insults, and secondary or indirect insults.

The structural traumatic insult includes incidences associated with the structural deformity of the skull like depressed skull fractures or a displaced skull fragment causing direct damage to the brain matter. The degree and extent of skull deformity may vary directly with the significance of the skull injury. The bridging cerebral vessels may be torn during the trauma which causes a subdural hematoma which may disrupt other cortical vessels in the brain. Trivial brain injuries may cause significant subdural hemorrhages in elderly patients [4].

Neurochemical insults correlates with surge of neurochemicals like catecholamine and hyroxyindole acetic acid (HIAA) in the cerebrospinal fluid (CSF) causing toxic effects to the brain tissues [5]. The initial brain trauma facilitates free radical release breaking down the lipid membranes of the neurons causing intraneuronal calcium accumulation and eventual cell death. Microdialysis of the CSF revealing the presence of excitotoxic aminoacids like glutamate and aspartate correlates with poor prognosis in traumatic head injuries [6]. Hypoxia and hypotension accounts for the majority of secondary insults associated with traumatic head injuries. Severe traumatic injury which halts the breathing centers of the hypothalamus may result to significant long-term or permanent brain injuries if oxygenation is not ensured at the site of the trauma during the rescue and extrication process [7].

The following helpful tips are most useful in the prevention of traumatic head injuries:

• Ensure the wearing of seatbelts when driving and make sure emergency airbags are working properly.
• Refrain from using alcohol or illegal drugs before driving. 
• Protective helmets may save one’s life when driving motorcycles and bicycles.
• Hand rails and nonslip mats may prevent accidents in the bathroom.
• Clear stairways of clutter and unnecessary obstruction.
• Install good lighting in the living quarters.
• Place shock absorbing material in children’s playground.

Head injury or traumatic brain injury happens when any external mechanical force to the head directly causes a temporal or permanent brain dysfunction. Head injury may also occur after a violent blow or jolt to the head or body part causing a penetrating injury to the skull like a projectile or a bullet.

Cerebral artery vasospasm may ensue as an immediate hemodynamic complication of traumatic brain injury causing intracranial hypertension in almost half of patients [1]. Serious traumatic head injury can result to brain bruising, torn tissues, and bleeding that may result to long standing complications or even death.

Definition

Head injury happens when an external mechanical force jolts the head causing temporary or permanent brain dysfunction.

Cause

Falls, vehicular accidents, armed conflict, sports injury and blast injuries are common causes. 

Symptoms

Altered state of consciousness, difficulty in respiration and rigidity may occur.

Diagnosis

Clinical examination and imaging studies like CT scan and MRI.

Treatment and follow-up

Mild traumatic head injury may not require any treatment. Medical decompression of the CSF pressure and neurosurgical treatment options may be necessary in more severe cases.

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3. Thurman D, Guerrero J. Trends in hospitalization associated with traumatic brain injury. JAMA. Sep 8 1999; 282(10):954-7.
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8. Chestnut R., Ghajar J., Maas A., Marion D, Servadei F., EARLY INDICATORS OF PROGNOSIS 
9. In Severe Traumatic Brain Injury.
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