Head injuries are one of the most common reasons people consult a doctor. The degree of head injuries can range from mild, only resulting in minor bruises or wounds, to severe or life-threatening. Moreover, the injury process can be primary or secondary. Primary injuries result from the damage done by the actual impact.
On the other hand, secondary injuries are subsequent changes that occur as a result of the initial insult. Thus secondary head injuries add further damage.
Unfortunately, there is very little that anybody can do about serious brain injury. For example, a person who sustains massive brain injury from a steamroller will need a miracle to live a productive life after the incident. Fortunately, minor to moderate primary head injuries and secondary brain injuries can be satisfactorily treated.
Secondary injuries, as mentioned, are the secondary events that occur after the primary injury. They can cause or contribute to further brain damage. Most commonly, these include bleeding, swelling of the brain (cerebral edema), and death of brain tissue (cerebral infarction) from lack of blood flow and oxygen to the brain. A speedy and appropriate management can make a great difference in determining the outcome or prognosis.
Let’s take a look at minor head injuries. A concussion occurs when there is an accelerative force to the brain greater than 200 milliseconds. Concussions can cause loss of consciousness, memory loss or amnesia, confusion with subsequent headaches, nausea, grogginess, irritability and vomiting.
The degree of concussion varies but there should be no significant long-term after-effects or sequelae if: 1) the period of loss of consciousness is less than 10 minutes and 2) the patient is well orientated with no neurological deficit when seen at the Accident and Emergency Department of the hospital.
What about major head injuries? Management must start at the site of trauma. After a neurological examination, prompt resuscitation to provide for an adequate blood pressure and oxygenation has been shown to significantly improve the prognosis.
Medical management is focused on preventing cerebral edema and high blood pressure. Since 60 percent of head injuries involve neck injuries, oxygen may be administered through a tube until serious neck injuries have been excluded. Medicines to prevent seizures are given to prevent further damage and loss of oxygen. Dilantin, the drug of choice for seizures, can be tapered off after a week unless delayed seizures occur. Hyperventilation or the rapid artificial oxygenation of the patient should not be done. This is because blood flow to the brain has been shown to be low during the first 24 hours and hyperventilation will just worsen the case. Antibiotic therapy is a good idea especially when there are multiple injuries or open wounds.
Ideally, the patient is brought to a tertiary-level hospital with well-developed head injury services and resident neurosurgeons.
An unconscious patient should immediately undergo a CT scan of the brain as well as x-ray imaging of the spinal column and chest. Should there be difficulty in maintaining blood pressure, the medical team will look for other sources of bleeding because there cannot be that much bleeding in the brain to cause a blood pressure drop.
If internal bleeding is present, it may accumulate inside space surrounding the lungs. This is called pleural effusion. Draining the accumulated fluid treats pleural effusion. Also, by providing low-flow oxygenation, the patient’s blood pressure should remain stable.
If a large clot in the brain is detected on CT scan, surgery is needed. Damaged brain tissue is removed to minimize the likelihood of swelling. Fractures are commonly present and will be treated accordingly.
Sometimes, the fractures can cause the fluid in the spine to leak out into the cavities of the nose and ears. Initially, the head will be elevated to prevent this. Antibiotics may be prescribed and the doctor may order lumbar cerebrospinal fluid drainage.
If these conservative measures fail, surgical repair will have to be done to prevent meningitis, the inflammation of the membrane that covers the brain and spinal cord.
A significant brain swelling is treated by surgically removing a large bone flap from the skull. This will afford space for the brain to expand. Another surgery is needed to correct the deformity left by the initial procedure.
In the Intensive Care Unit, vital signs are carefully monitored to ensure the brain is receiving enough oxygen. The head of the bed is elevated to at least 30 degrees to promote good circulation.
Medicines like Mannitol can be given to reduce the pressure within the skull. A comatose patient should have full coma nursing care with regular turning, chest and limb physiotherapy. An artificial airway may be done surgically (tracheotomy) if the patient is expected to be on assisted respiration. Uncontrolled intracranial pressure rise causes a poor prognosis. Medically inducing a coma can be done to correct this. However, results have been relatively disappointing, especially in children.
In summary, quick and efficient response to head injuries promote a better outcome for the patient.
Minor to moderate head injuries are easily treated in the AED. On the other hand, severe head injuries need referral to appropriately equipped hospitals.
The goal in treating severe head injuries is to prevent further damage to the brain. This is done by adequate oxygenation, relieving the pressure inside the skull, stopping the swelling of the brain (cerebral edema) and treating other injuries like fractures. Close contact nursing care is needed throughout the recovery phase of the patient.