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OR1.2 | Shock in Orthopaedic Trauma — SDL Guide (Part 3)
Self-Assessment: Shock Recognition and Management
Use these structured clinical scenarios to test your ability to integrate the shock classification, pathophysiology, and management principles from this module. For each scenario, identify the shock type and class, the pathophysiological mechanism, and the management priority. Resist the reflex to immediately match symptoms to a treatment — first identify the mechanism, because the mechanism determines the treatment.
Scenario A: A 68-year-old man on atenolol 50 mg/day is admitted after a road traffic accident. He has a grossly deformed pelvis on X-ray, BP 100/75 mmHg, HR 82/min, RR 20/min, confused. His ECG shows sinus rhythm at 82 bpm. The junior doctor says 'his HR is not that elevated, it's probably mild shock.' What is your assessment and what trap has the junior doctor fallen into?
Scenario B: A 19-year-old rugby player has a femoral shaft fracture from a tackle. Initial BP 118/80 mmHg, HR 96/min. You obtain IV access and send bloods. Twenty minutes later: BP 92/68 mmHg, HR 126/min, lactate 4.2 mmol/L. Describe what has happened physiologically and what you should have anticipated from the initial presentation.
Scenario C: Two hours after a C5 fracture-dislocation, a 35-year-old has BP 78/48 mmHg, HR 52/min, warm dry skin. His abdomen is soft. FAST is negative. What is the diagnosis? What investigation would you perform to exclude concurrent haemorrhage, and what is your immediate pharmacological management?
After completing these scenarios, note the two most important clinical features that distinguish neurogenic from haemorrhagic shock. These distinctions appear frequently in clinical examinations and are high-value clinical skills for your surgical and orthopaedic postings.
CLINICAL PEARL
The compensated shock trap: A young, fit patient with a femoral shaft fracture can lose 1.5 litres of blood while maintaining a systolic BP of 110–120 mmHg through robust sympathetic compensation. This is Class II haemorrhagic shock — the patient IS in shock, despite the near-normal pressure. The clinical pearls are: (1) never rely on systolic BP alone; assess pulse pressure (narrow = early vasoconstriction), heart rate, capillary refill, mental status, and urine output; (2) serum lactate >2 mmol/L confirms tissue hypoperfusion even with preserved BP; (3) in elderly or beta-blocked patients, the tachycardia may be blunted — use other markers. The 'normal-BP patient in shock' who is not recognised and resuscitated is the patient who suddenly decompensates in theatre.