First Aid at the Sports Field: Heat, Fainting and a Sprain
During a school cross-country race at 28 °C, a 14-year-old runner collapses near the finish. She is pale, sweating heavily, her skin is cool and clammy, and she is briefly unconscious but breathing normally. A second student twists his ankle on a tree root: the joint is swollen and painful but he can bear some weight, and there is no deformity. A teacher proposes to give the unconscious girl a drink of water immediately and to massage the swollen ankle with a warming ointment.
1. Identify the girl's likely condition and explain why the teacher's proposal is dangerous. State the correct first steps.
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Assessment: pale, cool, clammy skin, heavy sweating and brief loss of consciousness after exertion in heat point to heat exhaustion with fainting (orthostatic collapse), not heat stroke - heat stroke would show hot dry skin and confusion. The immediate danger is that swallowing while unconscious can cause choking or aspiration, and giving fluids to a semi-conscious person is unsafe.
Correct sequence:
- Move her to shade, lay her down and raise her legs to restore blood flow to the brain.
- Loosen tight clothing, fan her, apply cool wet cloths to the neck and forehead.
- Check breathing and consciousness; place in the recovery position if she stays unconscious but breathes.
- Give small sips of cool water only when fully alert.
- Escalate if she does not recover quickly, becomes confused, stops sweating, or her skin becomes hot - that suggests heat stroke, a medical emergency.
Why the teacher is wrong: fluids by mouth before consciousness returns risk airway obstruction and do not treat the cause (low blood pressure from heat and exertion).
2. For the ankle injury, evaluate the teacher's suggestion of massage with warming ointment. Describe correct management.
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Verdict: the suggestion is harmful.
Reasoning: the swelling is caused by torn vessels leaking fluid into tissue. Massage and heat increase blood flow and bleeding into the injured area, increasing swelling and pain. Warming ointment is contraindicated in the first 24–48 hours.
Correct management - protect, rest, ice, compress, elevate:
- Stop activity, protect the joint, avoid weight-bearing.
- Apply cold (ice wrapped in cloth, 15–20 min, never directly on skin) to constrict vessels and reduce swelling.
- Apply a supporting bandage that is firm but does not cause numbness or bluish toes.
- Elevate the limb above heart level.
- Seek medical assessment because a fracture cannot be excluded by eye; inability to bear weight or bony tenderness would need an X-ray.
Key principle: cold and rest limit secondary damage; heat and massage aggravate it.
3. Explain, in terms of the body's thermoregulation, why heavy sweating in heat can itself cause fainting.
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Reasoning chain:
- In heat, thermoreceptors signal the hypothalamus; sweat glands are activated and skin blood vessels dilate to lose heat.
- Heavy sweating causes water and salt loss, lowering blood volume.
- Vasodilation plus reduced volume lowers blood pressure; standing after exertion means blood pools in the legs, and the brain is briefly under-perfused → fainting.
Why the skin is cool and clammy: the sweat evaporating from skin cools it, and the body's vasomotor response can shift to vasoconstriction as compensation - hence pale, cool skin despite the heat.
Prevention: drink water before and during exercise, avoid peak heat, wear light clothing, and cool down gradually rather than stopping abruptly.