HEAD INJURY. Dept Neurosurgery
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1 HEAD INJURY Dept Neurosurgery
2 INTRODUCTION PATHOPHYSIOLOGY CLINICAL CLASSIFICATION MANAGEMENT - INVESTIGATIONS - TREATMENT
3 INTRODUCTION Most head injuries are due to an impact between the head and another object. Depending on the characteristics of the object (e.g. size, shape and hardness/softness) various resultant injuries appear.
4 It is not always necessary for the head to come into contact with an object for there to be a head injury - even a significant one for that matter. However, acceleration-deceleration without contact can occur (e.g. "shaken-baby syndrome") which can lead to neuronal damage and subdural haematomas.
5 DEFINITIONS CLOSED HEAD INJURY Head injury without open scalp wounds OPEN HEAD INJURY Head injury with open wounds PENETRATING HEAD INJURY Head injury with interruption of the dura. Eg. Knife, axe, Gunshot
6 PATHOPHYSIOLOGY There is a primary and a secondary head injury or primary and secondary brain damage. (A) PRIMARY HEAD INJURY: A primary head injury is an injury that occurs at the moment of the impact or accident.
7 The following are results of a primary head injury: - Concussion A transient loss of consciousness for usually up to a few minutes, with subsequent recovery and no neurological deficit except amnesia.
8 - Brain Contusion Area of swelling & diffuse haemorrhages (e.g. a bruise). Coupe & contre-coupe contusions. -Diffuse axonal injury -Skull Fractures Open or closed skull fractures
9 (B) SECONDARY HEAD INJURY A secondary head injury or secondary brain damage, is an injury due to something that develops after the impact or accident, and has adverse neurological effects. Clinically, a patient is intially well (even after a concussion), but later deteriorates.
10 Causes of Secondary Brain Damage (causes of deterioration) IIntracranial Causes: - Haematomas - extradural - subdural - intracerebral - Brain oedema or swelling - Meningitis/brain infections - Obstructive hydrocephalus
11 II Extracranial Causes - Hypoxia: leads to lactic acidosis and cerebral vasodilatation. This congestion leads to raised intracranial pressure. - Hypercarbia: This also leads to cerebral vasodilatation and raised intracranial pressure. - Hypotension: this leads to cerebral ischaemia. Note: CPP = MAP - ICP CPP = Cerebral perfusion pressure MAP = Mean arterial pressure ICP = Intracranial pressure Avoid MAP of ICP
12 CLINICAL CLASSIFICATION OF HEAD INJURY Glasgow Coma Scale: E: Eye opening response (1-4) M: Motor response (1-6) i.e. Best Motor Response V: Verbal response (1-5) E: 1 = No eye opening 2 = Opens eyes to pain 3 = Opens eyes to sound 4 = Spontaneous eye opening
13 M: 1 = No motor response 2 = Extensor/decerebrate response (rigidity) 3 = Flexor/decorticate response (rigidity) 4 = Withdrawal response 5 = Purposeful response 6 = Obeys commands V: 1 = No response 2 = Makes sounds only (to painful stimulation) 3 = Utters words only 4 = Says phrases, but confused 5 = Well orientated to time, place & person
14 GCS - used to monitor daily progress, and detect deterioration early. GCS - also useful in classifying the severity of the head injury (and prognosticating) e.g. Mild head injury: Moderate head injury: 9-12 Severe head injury: 3-8
15 CT BRAIN
16 CT BRAIN
17 CT BRAIN
18 CT BRAIN
19 TBI-1
20 TBI-2
21 TBI-3
22 2. What sign is exhibited above? Watter teken word hierbo vertoon?
23 14. What clinical sign is exhibited above? Watter kliniese teken word hierbo vertoon?
24 BOSF-1
25 BOSF-2
26 TBI-CNT
27 TBI-SAH
28 TBI-IVH
29 5. What intracranial bleed is represented on the CT scan? Watter intrakraniale bloeding word op die RT skandering afgebeeld?
30 6. What intracranial bleed is represented on the CT scan? Watter intrakraniale bloeding word op die RT skandering afgebeeld?
31 TBI-SDH
32 TBI-EDH
33
34 5. What intracranial bleed is represented on the CT scan? Watter intrakraniale bloeding word op die RT skandering afgebeeld?
35 TBI-SKULL FRACTURE
36
37
38 3. What is the diagnosis? Wat is die diagnose?
39 MANAGEMENT This is after resuscitation (A, B, C.) and stabilisation.
40 (A) INVESTIGATIONS -Skull X-rays: fractures to be elevated antibiotics. -CT brain: e.g. intracranial haematomas to be evacuated. -MRI scans: most advanced.
41 INITIAL MANAGEMENT OF A SEVERE HEAD INJURY GCS 8 RESUSCITATION RESIRATORY SYSTEM AND C-SPINE PROTECTION Intubate and ventilate to avoid hypoxia and hypercarbia CARDIOVASCULAR SYSTEM IV Fluids Initially Ringers lactate or Normal saline MAP mmgh Avoid glucose containing solutions in the first 24hrs unless hypoglycaemic CENTRAL NERVOUS SYSTEM (General Measures to control ICP) Elevate HOB to 30degrees Avoid constriction of the jugular veins Sedation and Analgesia Midazolam (Dormicum) 2 to 4mg/hr Propofol (diprivan) Morphine or fentanyl Anticonvulsants phenytoin LD: 18mg/kg MD 100mg 8hrly Antibiotic prophylaxis as necessary Paralysis Pancuronum Vercuronium ICP monitoring Indications See lecture on raised intracranial pressure Types Extradural, Subdural, Intracerebral, Intraventricular.
42 SPECIFIC MEASURES TO REDUCE RAISED INTRACRANIAL PRESSURE Ventriculostomy and CSF drainage Mannitol and lasix Mannitol is an osmotic diuretic and free radical scavenger Dose: 0.25g/kg 6hrly IV Monitor serum osmolality and maintain < 320mosm/kg to prevent renal failure. Paralysis Barbiturates eg. Sodium Pentobarbital May cause hypotension Hyperventilation Maintain PCO2 between 4 and 4.5kpa Steroids No longer in use for head injuries. No improvement in outcome Risk of side effects Surgical evacuation of the intracranial haematoma Decompressive craniectomy
43 OUTCOME PREDICTORS OF OUTCOME GLASGOW OUTCOME SCALE 5 Complete recovery 4 Partially disabled 3 Severly disabled 2 Persistent vegetative state 1 Died MORTALITY Mild HI 0.4% Moderate HI 4% Severe HI 40% MORBIDITY Sequelae or long term complications of a HI
44 (B) TREATMENT OF SEVERE HEAD INJURY - Head end elevation (30 ) and head/ neck neutral position. - Intubate for airway protection - I/V line for fluid therapy, bladder catheter. - Normalise Pa0 2 and PaCO 2 - Mannitol, 1-2g/kg/day for raised intracranial pressure. - Start feeding on day >2 n/g feeds.
45 THANK YOU!!!
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