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This is the complete lecture note for SUG605 Neurosurgery. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Course code: SUG 605 Course title: Neurosurgery Course credit load: 2 Units Series 1: Head Injury and Spinal Trauma • Part 1.1: Assessment of Head Injury o Sub Part 1.1.1: Initial assessment and the Glasgow Coma Scale o Sub Part 1.1.2: Classification of head injury severity o Sub Part 1.1.3: Recognising signs of raised intracranial pressure • Part 1.2: Types of Traumatic Brain Injury o Sub Part 1.2.1: Skull fractures o Sub Part 1.2.2: Extradural and subdural haematoma o Sub Part 1.2.3: Diffuse axonal injury and cerebral contusion • Part 1.3: Management of Head Injury o Sub Part 1.3.1: Emergency management of severe head injury o Sub Part 1.3.2: Indications for neurosurgical intervention in head injury o Sub Part 1.3.3: Complications of head injury • Part 1.4: Spinal Trauma o Sub Part 1.4.1: Assessment of spinal trauma o Sub Part 1.4.2: Spinal cord injury syndromes o Sub Part 1.4.3: Management of spinal trauma Introduction A fall from a ladder, a road traffic collision, a blow to the head during sport, these everyday mechanisms of injury can produce anything from a trivial bump to a genuinely life-threatening neurosurgical emergency, and correctly distinguishing between the two within the first minutes of assessment is the essential skill this opening Series sets out to build. Head injury and spinal trauma together account for a substantial proportion of neurosurgical emergency practice, and
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS both demand rapid, structured assessment given how quickly a seemingly stable patient can deteriorate. The aim of this Series is to equip you with the ability to assess a patient with head injury using the Glasgow Coma Scale, classify head injury severity, recognise raised intracranial pressure, describe the types of traumatic brain injury and their management, and assess and manage spinal trauma. Building this assessment and recognition skill early gives you the foundation needed for everything that follows in this course. This Series opens with the assessment of head injury, moves through types of traumatic brain injury and management of head injury, and closes with spinal trauma. Series Learning Outcomes At the end of this Series, you should be able to: • SLO 1.1: describe the initial assessment of a patient with head injury, including the Glasgow Coma Scale • SLO 1.2: classify head injury severity and recognise signs of raised intracranial pressure • SLO 1.3: describe the types of traumatic brain injury, including skull fractures and intracranial haematomas • SLO 1.4: distinguish diffuse axonal injury from cerebral contusion • SLO 1.5: describe the emergency management of severe head injury • SLO 1.6: discuss the indications for neurosurgical intervention and the complications of head injury • SLO 1.7: describe the assessment and classification of spinal cord injury • SLO 1.8: discuss the management of spinal trauma 1.1 Assessment of Head Injury 1.1.1 initial assessment and the glasgow coma scale A standardised way of describing conscious level Initial assessment of head injury follows standard trauma principles, an airway, breathing, circulation approach, before turning to focused neurological assessment using the Glasgow Coma Scale, a standardised, reproducible tool scoring eye opening, verbal response, and motor
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS response, with the three component scores summed to give a total ranging from three, indicating the deepest unresponsiveness, to fifteen, indicating full consciousness. Using the Glasgow Coma Scale consistently, and repeating it at regular intervals rather than performing a single assessment, allows genuine deterioration to be recognised promptly, since a falling score over time is often more clinically significant than the absolute value at any single point, and any drop of two or more points warrants urgent reassessment and escalation regardless of the starting score. Fill in the blank: The Glasgow Coma Scale scores eye opening, verbal response, and ________ response. 1.1.2 classification of head injury severity Sorting patients by initial Glasgow Coma Scale score Head injury is broadly classified by the initial Glasgow Coma Scale score into mild, a score of thirteen to fifteen, moderate, a score of nine to twelve, and severe, a score of eight or below, a classification that, while imperfect and requiring clinical judgement alongside it, provides a useful, widely understood shorthand for communicating injury severity and guiding initial management decisions. A Glasgow Coma Scale score of eight or below is specifically significant since it is generally taken as the threshold below which a patient's airway reflexes can no longer be relied upon to protect against aspiration, making airway protection, typically through intubation, a genuine priority in any patient scoring at or below this level regardless of the specific underlying cause of the reduced conscious level. Fill in the blank: A Glasgow Coma Scale score of eight or below is the threshold below which airway ________ can no longer be relied upon. 1.1.3 recognising signs of raised intracranial pressure Warning signs that the brain is running out of room Raised intracranial pressure presents with headache, vomiting, reduced conscious level, and, in more advanced or rapidly progressive cases, the Cushing's triad of hypertension, bradycardia, and irregular breathing, a late and ominous physiological response reflecting the brain's attempt to maintain adequate perfusion pressure against a dangerously elevated intracranial pressure.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Pupillary changes, particularly a unilaterally dilated, poorly reactive pupil, are a critically important sign of raised intracranial pressure causing compression of the third cranial nerve as the brain begins to herniate, and this specific finding, particularly when it develops or worsens during observation, constitutes a genuine neurosurgical emergency requiring immediate escalation rather than continued watchful waiting. Fill in the blank: A unilaterally dilated, poorly reactive pupil suggests compression of the third cranial ________. Figure 1.1: A clinician assessing pupillary response with a penlight during neurological examination. Pilot questions 1.1 1. Describe the three components of the Glasgow Coma Scale. (Linked to SLO 1.1) 2. Explain why repeated Glasgow Coma Scale assessment matters more than a single reading. (Linked to SLO 1.1) 3. List the Glasgow Coma Scale ranges for mild, moderate, and severe head injury. (Linked to SLO 1.2) 4. Explain the significance of a Glasgow Coma Scale score of eight or below. (Linked to SLO 1.2) 5. Describe Cushing's triad. (Linked to SLO 1.2)
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.2 Types of Traumatic Brain Injury 1.2.1 skull fractures A fractured skull, and what it can signal beneath Skull fractures are classified as linear, depressed, or basal, with a linear fracture often clinically insignificant in isolation but important as a marker of the force involved in the injury, and a depressed fracture, where a fragment of bone is displaced inward, carrying a higher risk of underlying brain injury and, if open, infection, sometimes requiring surgical elevation depending on the degree of depression and associated findings. Basal skull fractures carry particular clinical significance and are suggested by specific signs including Battle's sign, bruising over the mastoid process, panda eyes, bruising around both orbits, cerebrospinal fluid leakage from the nose or ear, and haemotympanum, blood behind the eardrum, findings that should prompt specific caution, including avoiding nasogastric tube insertion through the nose given the theoretical risk of intracranial passage through an associated skull base defect. Fill in the blank: Bruising over the mastoid process, known as Battle's sign, suggests a ________ skull fracture. 1.2.2 extradural and subdural haematoma Two collections of blood, two very different courses An extradural haematoma, blood collecting between the skull and the dura, classically results from arterial bleeding, often from the middle meningeal artery following a temporal bone fracture, and presents with a characteristic, though not universal, lucid interval, brief initial recovery of consciousness followed by rapid deterioration as the haematoma expands, a pattern reflecting the arterial source and correspondingly rapid rate of bleeding. A subdural haematoma, blood collecting between the dura and the underlying brain, typically results from venous bleeding, often from torn bridging veins, and can present acutely following significant trauma or, particularly in older adults on anticoagulation or with age-related brain atrophy, chronically over weeks following a comparatively minor or even forgotten injury, a genuinely important distinction given how differently these two presentations, acute and chronic, are managed.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Fill in the blank: An extradural haematoma classically presents with a lucid interval reflecting its ________ source of bleeding. 1.2.3 diffuse axonal injury and cerebral contusion Injury spread through, or bruising within, the brain tissue itself Diffuse axonal injury results from rotational or shearing forces disrupting axons diffusely throughout the brain, typically following high-energy deceleration injury such as a high-speed road traffic collision, and presents with a conscious level often disproportionately reduced relative to the sometimes relatively unremarkable initial appearance of the brain on standard imaging, since the diffuse microscopic injury is not always well visualised on
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