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This is the complete lecture note for MED604 Neurology II. 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: MED 604 Course title: Neurology II Course credit load: 2 Units Series 1: Higher Cerebral Function, Dementia, and Stroke • Part 1.1: Higher Cerebral Function o Sub Part 1.1.1: Assessment of higher cerebral function o Sub Part 1.1.2: Aphasia and language disorders o Sub Part 1.1.3: Agnosia, apraxia, and other cortical syndromes • Part 1.2: Dementia o Sub Part 1.2.1: Classification and approach to dementia o Sub Part 1.2.2: Alzheimer's disease o Sub Part 1.2.3: Vascular and other dementias • Part 1.3: Stroke: Pathophysiology and Assessment o Sub Part 1.3.1: Classification of stroke o Sub Part 1.3.2: Clinical presentation and localisation of stroke o Sub Part 1.3.3: Acute assessment and investigation of stroke • Part 1.4: Stroke: Management and Prevention o Sub Part 1.4.1: Acute management of ischaemic stroke o Sub Part 1.4.2: Management of haemorrhagic stroke o Sub Part 1.4.3: Secondary prevention and rehabilitation after stroke Introduction
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS This opening Series of Neurology II begins where cognition itself can be examined directly, working through the assessment of higher cerebral function, the major dementia syndromes that disrupt it over time, and stroke, the sudden vascular insult that can disrupt it in an instant. Each of these three areas demands the same careful, structured localisation skill that underpins the whole of clinical neurology, working out precisely where in the nervous system a lesion sits from the pattern of deficit it produces. The aim of this Series is to equip you with the ability to assess higher cerebral function and recognise aphasia and other cortical syndromes, classify and describe the major dementia syndromes, classify stroke and describe its clinical presentation, and describe the acute assessment, management, and secondary prevention of stroke. This foundation in cognitive assessment and cerebrovascular disease anchors much of what follows across the rest of this course. This Series opens with higher cerebral function, moves through dementia and stroke: pathophysiology and assessment, and closes with stroke: management and prevention. Series Learning Outcomes At the end of this Series, you should be able to: • SLO 1.1: describe the assessment of higher cerebral function • SLO 1.2: describe aphasia and other cortical syndromes including agnosia and apraxia • SLO 1.3: classify dementia and describe the general approach to its assessment • SLO 1.4: describe Alzheimer's disease, vascular dementia, and other dementias • SLO 1.5: classify stroke and describe its clinical presentation and localisation • SLO 1.6: describe the acute assessment and investigation of stroke • SLO 1.7: describe the acute management of ischaemic and haemorrhagic stroke • SLO 1.8: discuss secondary prevention and rehabilitation after stroke
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.1 Higher Cerebral Function 1.1.1 assessment of higher cerebral function A structured bedside evaluation of cognition Assessment of higher cerebral function systematically examines orientation, attention, memory, language, visuospatial function, and executive function, typically using a structured, validated screening tool alongside targeted bedside testing directed by the specific clinical concern, since a brief global screening test alone can miss a focal cognitive deficit affecting only one specific domain while sparing others entirely. Interpreting cognitive assessment findings requires accounting for the patient's baseline education level, language, and cultural background, since a low score on a standardised test can reflect these factors rather than genuine cognitive impairment, and comparing performance against an estimated premorbid baseline, where available, considerably strengthens the confidence with which a genuine cognitive decline can be identified. Fill in the blank: A brief global screening test alone can miss a focal cognitive deficit affecting only one specific ________. 1.1.2 aphasia and language disorders Disorders of language, distinct from disorders of speech Aphasia, an acquired disorder of language rather than of speech articulation itself, is classified according to the pattern of fluency, comprehension, and repetition affected: Broca's aphasia, non-fluent speech with relatively preserved comprehension, localises to the posterior inferior frontal lobe, while Wernicke's aphasia, fluent but often meaningless speech with impaired comprehension, localises to the posterior superior temporal lobe. Conduction aphasia, fluent speech and relatively preserved comprehension but disproportionately impaired repetition, reflects damage to the arcuate fasciculus connecting Broca's and Wernicke's areas, and correctly classifying the specific aphasia subtype present provides genuinely valuable localising information about the underlying lesion before any imaging is even obtained, a skill this sub-Part aims to build through systematic bedside assessment of these three language components. Fill in the blank: Conduction aphasia reflects damage to the arcuate fasciculus connecting Broca's and Wernicke's ________.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.1.3 agnosia, apraxia, and other cortical syndromes Failures of recognition and skilled movement, not of the senses themselves Agnosia, an inability to recognise objects, faces, or sounds despite intact primary sensory function, and apraxia, an inability to perform learned, skilled motor tasks despite intact strength and coordination, both reflect disruption of higher-order cortical processing rather than a primary sensory or motor deficit, a distinction genuinely important to establish clearly through careful examination before attributing either finding to a more basic sensory or motor problem. Neglect, most commonly affecting the left side of space following a right parietal lesion, describes a failure to attend to or respond to stimuli on the affected side despite intact sensory pathways, and, alongside agnosia and apraxia, forms part of a broader group of cortical syndromes that localise reliably to specific, recognisable brain regions, reinforcing the genuinely powerful localising value of careful higher cerebral function assessment. Fill in the blank: Neglect most commonly affects the left side of space following a right ________ lesion. Figure 1.1: A clinician assessing language function through object naming during bedside examination.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Pilot questions 1.1 1. List the domains assessed in higher cerebral function testing. (Linked to SLO 1.1) 2. Explain why baseline education and language must be considered when interpreting cognitive testing. (Linked to SLO 1.1) 3. Distinguish Broca's from Wernicke's aphasia. (Linked to SLO 1.2) 4. Describe conduction aphasia and its anatomical basis. (Linked to SLO 1.2) 5. Distinguish agnosia from apraxia. (Linked to SLO 1.2) 1.2 Dementia 1.2.1 classification and approach to dementia A syndrome, not a single disease, with several distinct causes Dementia, an acquired, progressive decline in cognitive function sufficient to interfere with independent daily functioning, is a syndrome rather than a single disease, with Alzheimer's disease, vascular dementia, dementia with Lewy bodies, and frontotemporal dementia together accounting for the great majority of cases, each with a distinct, though sometimes overlapping, clinical and pathological pattern. A systematic diagnostic approach distinguishes genuine dementia from delirium, an acute, fluctuating confusional state with a demonstrable medical cause, and from depression, which can produce a pattern of cognitive slowing sometimes termed depressive pseudodementia, since each of these alternative explanations requires an entirely different management approach, making accurate initial differentiation a genuinely essential first step before any specific dementia diagnosis is pursued further. Fill in the blank: Dementia must be distinguished from delirium, an acute, fluctuating confusional state with a demonstrable medical ________. 1.2.2 alzheimer's disease The most common cause of dementia Alzheimer's disease, the most common cause of dementia, characteristically presents with insidious onset and gradual progression, typically beginning with prominent short-term memory impairment before extending to language, visuospatial, and executive difficulties as the disease advances, a pattern reflecting the disease's typical early involvement of the medial temporal lobe structures responsible for new memory formation.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Diagnosis relies primarily on the characteristic clinical history and pattern of cognitive decline, supported by structural imaging to identify a pattern of atrophy consistent with the diagnosis and to exclude an alternative structural cause, and management combines cholinesterase inhibitor medication, which can offer modest symptomatic benefit in appropriately selected patients, alongside environmental support, caregiver education, and planning for anticipated future care needs. Fill in the blank: Alzheimer's disease typically begins with prominent short-term ________ impairment before extending to other domains. 1.2.3 vascular and other dementias Different underlying mechanisms, distinct clinical clues Vascular dementia, resulting from cerebrovascular disease, characteristically presents with a stepwise, rather than smoothly progressive, decline, following discrete vascular events, and often with more prominent executive dysfunction relative to memory impairment compared with Alzheimer's disease, a distinguishing clinical pattern that, alongside vascular risk factors and supporting imaging findings, helps differentiate it from other dementia causes. Dementia with Lewy bodies presents with fluctuating cognition, recurrent visual hallucinations, and spontaneous parkinsonism, alongside marked sensitivity to antipsychotic medication, while frontotemporal dementia presents earlier in life with prominent personality and behavioural change or progressive language impairment, with memory relatively preserved in the early stages, two further distinct patterns worth recognising confidently alongside the more common Alzheimer's and vascular presentations already discussed. Fill in the blank: Dementia with Lewy bodies shows marked sensitivity to ________ medication. Table 1.1: Comparing the major
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