Investigation Data Computerised Tomography Report Assessment

Case 1: Thomas Bike-Riding Accident

Consider the person - Part A - Acute Phase

On a bright and crisp autumn morning, 24-year-old Thomas Nguyen was enjoying a mountain biking adventure on the slopes of Kunanyi/ Mt. Wellington, near Hobart. As he was navigating a tricky descent, Thomas lost control of his bike after hitting a loose patch of gravel and was thrown over the handlebars. He landed forcefully on his upper back, instantly feeling a searing pain in his upper back.

His riding partner, Oliver, who was following closely behind, saw the accident and immediately stopped to help. Seeing Thomas in pain and unable to move, Oliver quickly dialed the emergency number to call for paramedics. The paramedics arrived about 45 minutes later and began the patient assessment.

Paramedics

Neurological Assessment:

• GCS: eye opening – spontaneous; verbal – oriented although drowsy; motor – can obey commands (blinking eyes, poking tongue out); some recall of the accident 
• Pupillary assessment: PERRLA (pupils equal, round, and reactive to light and accommodation)
• Motor function: unable to move legs  or thorax
• Sensation: No sensation below the armpits, including thorax, abdomen, and legs. Normal sensation in arms, neck, face and head
•  Deep tendon reflexes: normal biceps and triceps reflex. Minimal quadriceps (knee jerk) and gastrocnemius (Achilles tendon) reflexes

Vital signs: 

• RR: 28 bpm, abdominal expansion but thorax not expanding, use of some accessory muscles.
• SpO2: 92% on room air; oxygen started at 15 L/min via non-rebreather mask
•  BP: 100/72 mmHg (MAP 81 mmHg)
• HR: 82 bpm
• T: 35.2oC 

After the initial assessment, the paramedics stabilised Thomas’s spine and placed him on a long spine board. A helicopter was requested and arrived 30 minutes later. Thomas was carefully loaded into the helicopter and transported to the Royal Hobart Hospital for further evaluation and treatment. Throughout the journey, paramedics continuously monitored his vital signs and reassured him, which helped to keep him calm during this stressful situation.

Triage

Vital signs on arrival:

• RR: 26 bpm, some use of accessory muscles.
• SpO2: 97% (O2 titrated to 5L/min via Hudson mask)
• BP: 96/60 mmHg (MAP 72 mmHg)
• HR: 64 bpm
• T: 36.8oC (tympanic) 

Pain assessment:

• Provoking/palliating - nothing particularly provokes the pain, it is just present
• Quality - stabbing and aching
• Region/radiation - upper chest and medial surface of the arms
• Severity - 7/10
• Timing - worsening since the accident

Neurological assessment:

• GCS: eyes - 4; Verbal - 5; Motor - 6
• Pupils: PERRLA, pupils 3 mm
• Limb movements: as above in "Disability" notes

Assessment and Investigation data Computerised Tomography Report

Findings:

• No intracranial injury
• T2 hyperextension injury with some blood seen at T1–T3 and small bone fragments within the spinal canal
• Mild contusion on left scapular area.

Actions and interventions

• spinal precautions and then immobilisation and stabilisation of spine
• intravenous therapy
• vasopressor therapy to maintain MAP >85 mmHg
• 1/24 (hourly) neurological assessment (Glasgow Coma Scale, Pupillary response,
  Limb strength), for 12 hours
• 1/24 (hourly) vital sign assessment
• telemetry
• mechanical ventilation
• analgaesia & 2/24 (second hourly pain assessment)
• insertion of indwelling urinary catheter and fluid balance monitoring
• pressure risk management
• thermoregulation support - maintain body temperature between 35.5 - 38.0oC

Consider the person Part B Chronic Phase

Six months ago, Thomas sustained a significant spinal cord injury after falling from a bike while riding, causing a Hyperextension thoracic spine fracture (HTSF) at T2, leaving bone fragments in the spinal canal.

Collect cues

After spinal shock had resolved, the extent of his injury could be determined. Thomas has the following deficits;

• Sensory: Complete loss of sensation bilateral in dermatomes below T2
• Motor: Paralysis of the lower limbs and trunk.
  Normal strength in the muscles that move arms, hands, shoulders and head (neck)

Actions and Interventions

Thomas lives at home with his parents and attends a spinal cord injury rehabilitation facility on a daily basis. Thomas uses a wheelchair and is waiting to be assigned a self-propelled wheelchair. Thomas has a permanent indwelling urinary catheter and uses a bowel management programme. Thomas receives counselling and assisted by his family, has joined online spinal cord injury support groups.

Visual assessment: diaphoresis and flushing on head and arms; pallor in legs and nailbeds of toes; excess mucus production from nasal passages.

Question 1

Consider the collected cues in the section 'Today – 0830 – hygiene support' (Chronic Phase, Part B)

Provide a comprehensive and detail explanation of the links between assessment findings and underlying anatomy, physiology, and pathophysiology, including explanations at the cellular and tissue level for Thomas's presentation of MAP (increased from his usual MAP), and bradycardia, and quoting in brackets ( ) the relevant data and information from the clinical scenario that support the explanations/arguments.

Word limit: suggested 300 words excluding in-text references for this answer. 3-4 references needed.

Case 2: Amelia's Strong Headache

Consider the person

Amelia Frankish is 67 years old.She presented to her GP last week, complaining of a very strong headache, followed by dizziness. The symptoms had resolved by the time she could see the GP, who was
concerned enough to request a CT (computerised tomography) of Amelia's head and neck.

Medical history

Diabetes mellitus Type 2:

Management:

• metformin 1000mg, daily
• enalapril 10 mg daily
• rosuvastatin 10mg, daily
• Atrial fibrillation (AF)

Management:

• apixaban 2.5 mg, BD
• sotalol 40 mg, BD
• Cigarette smoking: 20 - 30 cigarettes/day, quit 5 years ago.

Triage

Vital signs: 

• RR: 18 bpm 
• SpO2: 98% 
• BP: 180/92 mmHg  (MAP 121 mmHg)
• HR: 98 bpm 
• Temp: 37oC

Pain assessment: 

• Provoking/palliating: pain is worse when Amelia moves her head suddenly, nothing seems to relieve the pain 
• Quality: the pain feels like extreme pressure on the left side of her head 
• Region/radiation: the pain is confined to her head 
• Severity: 9/10 
• Timing: first pain onset was about 2 hours ago 

Neurological assessment: 

• GCS: 15 
• Pupils: PERRLA 
• ROSIER (Recognition of stroke in the emergency room) Scale
• Loss of consciousness or syncope: NO
• Seizure activity: NO
• Asymmetric facial weakness: YES
• Asymmetric arm weakness: YES (right upper limb paralysis - unable to respond to movement request)
• Asymmetric leg weakness: YES (right lower limb paresis – mild weakness) 
• Speech disturbance: YES (some slurring of words (dysarthria) is noted)
• Visual field deficit: NO

Cardiovascular assessment

An ElectroCardioGram (ECG) is undertaken which shows normal sinus rhythm. Blood tests are ordered including full blood count (FBC), urea & electrolytes (U&Es), liver function tests (LFTs), coagulation studies (COAGs) including Anti-Xa levels.

Metabolic assessment

Blood Glucose Level (BGL): peripheral 9.8 mmol/L (Amelia reports not having eaten since yesterday, nor has she had her medications today)  Computerised Tomography report.

Question 3

Take Action
"1/24 (hourly) neurological assessment for 4 hours" has been requested for Amelia.
Referring only to the pupillary response component of the assessment, provide a
rationale for this intervention by:

• referring to relevant anatomical structures and discussing the pathophysiological mechanisms of deterioration that would cause observed changes to Amelia's pupillary response assessment,
• identifying TWO other assessment data (signs or symptoms) that might be evidence of neurological deterioration, and
• identifying the guidelines that support this intervention of hourly neurological assessment.

Provide a comprehensive and detailed understanding of the aim and mechanism of action of therapeutic approaches (if required), as well as their intended and unintended consequences, based on current evidenceinformed knowledge appropriate for the situation or patient.

Assessment Requirements Concise Summary

Overall task: produce focused, evidence-based clinical answers that link assessment findings to pathophysiology and justify monitoring/therapeutic choices. Answers must be targeted, referenced and meet stated word limits.

Question 1 (Thomas Chronic phase, “Today – 0830 – hygiene support”)

• Provide a comprehensive explanation linking Thomas’s assessment cues to underlying anatomy, physiology and pathophysiology including cellular/tissue level mechanisms.
• Explain why Thomas shows an increased MAP and bradycardia, referencing the scenario data in brackets (use direct quotes from the case to support points).
• Word limit: suggested ≈300 words (excl. in-text refs). Use 3–4 up-to-date references.

Question 3 (Amelia — Strong headache)

• Justify the request for hourly pupillary checks for 4 hours:
  • Link likely anatomical structures and pathophysiological processes that would change pupil response.
  • Identify two other signs that would indicate neurological deterioration.
  • Cite the guidelines that support hourly neurological observations.
• Also describe the aim and mechanism of likely therapeutic approaches (if required), with intended and unintended consequences; base this on evidence-informed practice.

Mentor-guided step-by-step Approach 

General preparatory steps (both Qs)

1. Read the scenario carefully and highlight the clinical cues you will quote (e.g., “Complete loss of sensation bilateral in dermatomes below T2”; “diaphoresis and flushing on head and arms; pallor in legs and nailbeds”).
2. Map facts → anatomy → physiology → pathophysiology before drafting. Use short bullet notes (fact → structure → mechanism).
3. Limit scope to what the question asks (Q1: MAP/bradycardia mechanistic link; Q3: pupils + two other signs + guideline + therapies).
4. Use ILAC-style micro-structure in each short paragraph: Issue → Law/physiology → Apply to facts (quote) → Conclusion.
5. Reference 3–4 reputable sources for Q1; for Q3 cite stroke/neuro obs guidelines and one pharmacology/critical-care source.

Thomas Suggested Stepwise plan

1. Issue statement (1–2 lines): identify the clinical phenomena you will explain — e.g., autonomic disturbance presenting as increased MAP with reflex bradycardia and cranial/upper-body vasomotor signs.

2. Anatomy anchor: note lesion level: “Hyperextension thoracic spine fracture at T2” and the later note: “Complete loss of sensation bilateral in dermatomes below T2.” Use these direct quotes to anchor your answer.

3. Pathophysiology (core paragraphs):

   • Explain sympathetic outflow anatomy: preganglionic sympathetic neurons originate in the intermediolateral cell column (T1–L2). A lesion at T2 disconnects supraspinal inhibitory control to sympathetic neurons below the lesion.
   • Mechanism of autonomic dysreflexia (AD): noxious stimulus below lesion → massive sympathetic discharge below lesion → widespread vasoconstriction (↑ systemic vascular resistance) → sudden rise in arterial pressure (MAP). Quote scenario signs that point to AD: e.g., “diaphoresis and flushing on head and arms; pallor in legs and nailbeds” (these show vasodilation above and vasoconstriction below the lesion).

   • Baroreceptor reflex (cellular/tissue level): carotid and aortic baroreceptors detect hypertension → increased parasympathetic (vagal) output to heart (via nucleus ambiguus/DMNV) → bradycardia. Explain neurotransmitters: sympathetic mediated norepinephrine release at vascular smooth muscle causing vasoconstriction; parasympathetic acetylcholine release acting on SA/AV node causing HR fall.

4. Tie to clinical data: reference baseline/earlier MAP values if helpful (e.g., earlier triage MAPs) and link to current cues (use quoted statements from the chronic phase).

5. Short concluding sentence: summarise that the signs are most consistent with AD secondary to a high thoracic spinal cord lesion and explain clinical significance (risk of end-organ damage).

Tips: be explicit about quotations embed them in the text to show you used scenario data. Keep cellular detail succinct but specific (neurotransmitters, autonomic pathways, vascular smooth muscle response).

Amelia suggested stepwise plan

1. Issue statement (1 line): hourly pupillary checks aim to detect early neurological deterioration (raised intracranial pressure or evolving intracranial lesion causing brainstem compression).

2. Anatomical & physiological rationale:

   • Outline pupillary reflex arc:
     • Afferent: retina → optic nerve → pretectal area.
     • Efferent: Edinger-Westphal nucleus → oculomotor nerve (CN III) parasympathetic fibers → ciliary ganglion → sphincter pupillae (constriction).
     • Sympathetic dilation pathway originates from T1 → superior cervical ganglion → dilator pupillae.
   • Pathophysiological mechanisms of deterioration:
     • Expanding intracranial lesion or raised ICP → transtentorial (uncal) herniation compresses CN III → ipsilateral dilated, non-reactive pupil (parasympathetic fibers on outside of nerve compressed first).
     • Alternatively, brainstem ischemia affects pupillary centers → abnormal or sluggish light reflex.

   • Link to Amelia’s data: severe headache, focal neurological deficits (ROSIER positive: asymmetric facial/arm/leg weakness, speech disturbance), BP 180/92, on apixaban all raise suspicion for intracranial haemorrhage or large ischemic event where rapid deterioration is possible.

3. Two other signs that suggest neurological deterioration:
   • Decreasing level of consciousness / GCS decline (e.g., drowsiness, reduced verbal responsiveness).
   • Progressive focal neurological deficits (worsening limb weakness or new cranial nerve palsies).

   • (Also vomiting, new seizure activity or progressive hypertension can be considered).

4. Guidelines to cite/support hourly neuro obs:

   • State that acute stroke / possible intracranial haemorrhage protocols (e.g., local stroke unit policies and national guidelines such as the Stroke Foundation/Australian Clinical Guidelines for Stroke Management and comparable emergency care guidance) recommend frequent neurological observations in the first hours to detect deterioration. (When writing your submission, cite the current Stroke Foundation clinical guideline and your local hospital stroke/neurosurgery/inpatient observation policy.)

5. Therapeutic approaches aim, mechanism, intended/unintended consequences:
   • Immediate aims: prevent secondary brain injury, control blood pressure within recommended targets, secure airway/oxygenation, reverse anticoagulation if haemorrhage, obtain urgent neuroimaging and neurosurgical review.
   • Possible interventions & mechanisms:
     • Rapid CT brain to distinguish ischemic vs haemorrhagic stroke → guides therapy.
     • Reversal of anticoagulation (if CT shows bleed): prothrombin complex concentrate or specific reversal agents  intended effect: stop bleed; unintended: thrombotic risk.
     • Controlled BP lowering (e.g., IV antihypertensive like labetalol or nicardipine per guideline targets)  mechanism: reduce further bleeding risk and limit haemorrhage expansion; unintended consequence: excessive reduction → reduced cerebral perfusion pressure (bad in ischemia).
     • Thrombolysis/endovascular thrombectomy if ischemic large vessel occlusion and not anticoagulated mechanism: reperfusion; risks: haemorrhagic transformation.
     • Neurosurgical decompression if large hemorrhage with mass effect intended outcome: reduce ICP; risks: surgical complications.
   • Emphasise individualised decision-making: Amelia’s apixaban use likely precludes immediate thrombolysis and increases bleeding risk — hence urgent CT and specialist input are essential.
6. Conclude by linking the hourly pupillary check to early detection of the above complications and enabling timely therapy.

Tips: keep the therapy discussion high-yield — emphasise aims, mechanisms and possible harms rather than listing many drugs.

Outcome expected & learning objectives covered

Outcome Achieved:

• Student produces succinct, clinically grounded answers that (a) correctly identify autonomic dysreflexia physiology and cite the exact scenario cues, and (b) justify hourly pupillary observations with clear links to neuroanatomy, two additional deterioration signs, guideline backing and a reasoned account of likely therapeutic options and their trade-offs.

Learning Objectives met:

1. Translate bedside observations into pathophysiological explanations that include anatomical and cellular mechanisms.
2. Use scenario data (quoted) to support clinical reasoning.
3. Demonstrate knowledge of acute neurological monitoring priorities and the rationale for frequency of observations.
4. Explain therapeutic aims, basic mechanisms of action, and foreseeable complications in an evidence-informed way.
5. Present concise, referenced clinical explanations suitable for clinical assessment marking criteria.

Final practical checklist

• Q1: ~300 words; include 3–4 refs; use at least two direct quotes from the scenario (e.g., “Complete loss of sensation…”, “diaphoresis and flushing…”).
• Q3: Structure into (a) pupillary anatomy/pathophys rationale, (b) two other deterioration signs, (c) guidelines cited, (d) therapy aims + mechanisms + risks. Use 2–3 references (stroke guideline + neurocritical care source).
• Keep language precise, avoid speculative statements; always label assumptions if you must infer data not given.
• Use current, reputable sources (clinical guidelines, major textbooks, review articles) and cite them in-text.

If you want, I can now:

• Draft a 300-word model answer for Q1 that you can use as a reference, with suggested citations; or
• Draft a model response for Q3 (including suggested guideline citations and brief therapeutic notes).

Which model answer would you like me to produce next?

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