Trauma General Principles
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Direct answer
The primary survey is ordered the way people die: airway, breathing, circulation, disability, exposure — with recent teaching placing catastrophic haemorrhage first as C-ABC, since a pumping femoral artery kills faster than a blocked airway. Each letter carries a treat-as-you-find protocol: airway with cervical spine control and early intubation for the obstructed or GCS-8-or-below patient; breathing by decompressing a tension pneumothorax; circulation by direct pressure, tourniquet, pelvic binder and warmed fluids, hunting the classic blood-loss cavities of chest, abdomen, pelvis and long bones; disability by pupils and Glasgow Coma Scale; exposure by undressing fully while preventing hypothermia. Only after the patient is stabilised does the secondary survey — head-to-toe examination, AMPLE history, and imaging — search for the injuries that did not threaten life in the first hour. For the dental surgeon the stakes are immediate: maxillofacial trauma obstructs the airway early, with blood, displaced fragments and a fallen-back tongue.
What you must remember
- ABCDE with the C-ABC update: catastrophic haemorrhage control first (pressure, tourniquet), then airway with in-line cervical stabilisation, breathing, circulation with two wide-bore cannulae, disability (GCS, pupils), exposure with warmth — treat life-threatening findings before moving to the next letter.
- Glasgow Coma Scale arithmetic: eyes 4, verbal 5, motor 6 — maximum 15, minimum 3; a score of 8 or below is the classical intubation threshold; motor score correlates best with outcome.
- The four bleeding cavities: chest, abdomen, pelvis-retroperitoneum and long bones — external blood is seen, cavity blood is shocked; investigations follow the portable trauma series of cervical spine, chest and pelvis radiographs plus eFAST ultrasound.
- Tension pneumothorax: progressive one-way air escape — severe respiratory distress, tracheal deviation away, absent breath sounds, distended neck veins, hyper-resonance; needle decompression at the second intercostal space mid-clavicular line (fifth space anterior-axillary in updated teaching) before any radiograph.
- AMPLE history: Allergies, Medications, Past history, Last meal, Events of injury — the two-minute trauma anamnesis taken while lines are placed.
- Golden hour concept: the first 60 minutes from injury determines survival in haemorrhagic trauma — the rationale behind Indian ambulance and trauma-care programmes and ATLS course discipline.
- Maxillofacial airway threats: bilateral mandibular fractures let the tongue fall back; midface fractures bleed and obstruct; foreign bodies, avulsed teeth and expanding haematomas threaten early — chin lift or jaw thrust (not head tilt with a possible C-spine injury), suction, oropharyngeal airway, and early surgical airway when intubation is impossible.
- Prevention of the lethal triad: hypothermia, acidosis and coagulopathy compound each other in massive bleeding — warm the patient, warm the fluids, replace factors early.
The first ten minutes of a crash victim
A helmetless two-wheeler rider arrives after a road accident, bleeding from the face, drowsy. Someone shouts the survey. Catastrophic haemorrhage: an assistant compresses a scalp gash. Airway with C-spine control: manual in-line stabilisation, jaw thrust, suction of blood and fragments — he mutters, so his airway is currently patent; a hard collar, blocks and tape follow. Breathing: trachea central, equal chest rise, no flail segment; oxygen applied. Circulation: two 16-gauge cannulae, warmed saline started, pressure dressing on the leg wound, pelvis bound pending radiograph. Disability: eyes open to pain (E2), confused words (V4), withdraws to pain (M4) — GCS 10, pupils equal, note the time; a GCS drop of 2 or more mandates reassessment of airway and breathing first. Exposure: log roll, inspect the back, keep him covered. Only then the secondary survey — facial bones, mandible occlusion, dental avulsions (an avulsed tooth is a managed airway foreign body and a replantation emergency in its own right), chest, abdomen, pelvis, limbs, neurology — plus the AMPLE questions to the accompanying family, and imaging as indicated. The sequence, not speed alone, is what the examiner is marking.
How the exam frames it
BDS questions concentrate on the primary survey sequence and the Glasgow Coma Scale — both are certificate-level knowledge for dental students managing chairside emergencies and trauma referrals. Viva favourites: the components and scoring of GCS with the intubation threshold of 8; the differences between the primary and secondary survey; and the specific airway threat of mandibular fractures. The Indian context adds triage in mass casualties — the colour-coded priority sorting that decides who is treated first — and the medico-legal duties of a dental practitioner receiving trauma: records, police intimation in vehicular cases, and careful documentation of dental injuries.
Frequently asked questions
What is the correct order of the primary survey?
Catastrophic haemorrhage control followed by airway (with cervical spine protection), breathing, circulation, disability and exposure — treating each life threat as it is found before moving on.
At what Glasgow Coma Scale score is intubation generally indicated?
A total of 8 or below, because airway reflexes fail and the injured brain hypoxaemia worsens — the classical threshold taught with the scale.
Why does a bilateral mandibular fracture threaten the airway?
Loss of anterior mandibular support lets the tongue base fall back against the posterior pharyngeal wall, obstructing the airway, worsened by blood and supine positioning.
What is the AMPLE trauma history?
Allergies, Medications, Past medical history, Last meal, and Events surrounding the injury — a rapid structured history taken during resuscitation.
How is a tension pneumothorax treated before imaging?
Immediate needle decompression with a large-bore cannula at the second intercostal space in the mid-clavicular line (fifth intercostal space, anterior axillary line in current teaching), followed by a formal chest drain.