Prepping for a heatwave (Part 4): Medical triage
The lifeguard’s instructor put it in five words that have saved more people than any equipment: “Wet and weak is recovery. Dry and delirious is 911.” Every summer someone gets the order backwards. They hand a glass of water to the person who needs an ambulance, or they call the ambulance for the person who needs shade and salt. The difference between those two mistakes is measured in brain cells, because heat stroke cooks the organ that would have noticed something was wrong.
Heat illness is a spectrum, not a switch. It starts as discomfort, slides into exhaustion, and crashes into stroke. The transition from “sick” to “dying” can happen in minutes, and the symptoms can be counter-intuitive. Most people wait for someone to pass out before calling 911, that is too late.
If you don’t know the difference between a fast/weak pulse (exhaustion) and a fast/strong pulse (stroke), or why stopping sweating is a fatal sign, you might apply the wrong treatment. By mastering this triage protocol, you become the diagnostician, you can look at a family member and know instantly whether they need Gatorade and a nap, or an ambulance and an ice bath. This is Part 4 of the heatwave series.
Disclaimer: The information provided in this article is for general informational and educational purposes only. It is not intended as, and should not be considered, medical advice. In any medical emergency, call 911 immediately.
The Readiness Audit
Could you tell heat exhaustion from heat stroke on sight?
- Green: You know the wet/weak vs. dry/delirious distinction and the cooling hierarchy.
- Yellow: You know “call 911” but not the specific signs that trigger it.
- Red: You would wait for someone to pass out.
If you are Yellow or Red, memorize Phases 1 and 2 now.
Phase 1: Heat Exhaustion (The Warning Shot)
Goal: Recognize the stage you can fix at home.
At this stage, the body’s cooling system is working overtime but can’t keep up. The engine is redlining, but it hasn’t blown a gasket yet.
The symptoms (look for “wet and weak”):
- Skin: pale, cold, and clammy.
- Sweat: heavy, profuse sweating.
- Pulse: fast but weak (thready).
- Mind: dizziness, headache, nausea, but rational, they know who and where they are.
- Muscle: cramps are common.
The protocol: move to a cooler place immediately, loosen tight clothing, apply wet cloths to the neck and face, sip water or electrolytes slowly (don’t gulp), and monitor. If they vomit or symptoms don’t improve in one hour, seek medical help.
The Takeaway: Wet and weak is the engine redlining, treatable with shade, salt, and slow sips, with the one-hour mark as your deadline.
Phase 2: Heat Stroke (The Medical Emergency)
Goal: Recognize the stage that needs an ambulance.
At this stage, the body’s thermostat has failed and it can no longer cool itself. Internal temperature spikes to 103°F (39.4°C) or higher. This is a life-or-death emergency.
The symptoms (look for “dry and delirious”):
- Skin: hot, red, and usually dry (no sweating). In exertional heat stroke from sports, they may still be sweaty, but the skin will feel remarkably hot.
- Pulse: fast and strong (bounding).
- Mind: confusion, slurred speech, unconsciousness, or aggression, altered mental state is the #1 red flag.
- Temperature: 103°F or higher.
The protocol: call 911 immediately, then begin aggressive cooling, this is the priority. Immerse them in a cool (not freezing) bath, spray them with a garden hose, or place ice packs on the neck, armpits, and groin. Do not force fluids, if they are confused or unconscious, they cannot swallow properly and may choke.
The Takeaway: Dry and delirious is a furnace with a broken thermostat: 911 first, ice second, and no fluids to a brain that cannot swallow.
Phase 3: The Cooling Hierarchy
Goal: Use the most aggressive method available.
When treating heat stroke while waiting for the ambulance, use the most aggressive method available.
- Gold standard, cold water immersion: placing the victim in a tub of ice water is the fastest way to drop core temp (keep the head above water).
- Silver standard, tarp taco: place the victim on a tarp, fill it with ice and water, and lift the sides to cover them in the slush.
- Bronze standard, evaporative cooling: remove clothes, mist them constantly with cool water, and fan them vigorously, this mimics sweating.
The Takeaway: Tub, taco, mist: always the most aggressive tool the scene can support, because the minutes while you wait are the treatment.
The Essential Kit Checklist
- The diagnostic: a digital thermometer in your first aid kit.
- The ice: ice packs kept in the freezer at all times during summer.
- The knowledge: the symptoms printed and stuck to the fridge (wet/weak vs. red/hot).
- The sprayer: a dedicated spray bottle filled with water for evaporative cooling.
Scenario Planner (Contingencies)
“They are vomiting and can’t keep water down.” The trap: pushing fluids when the stomach has shut down. The fix: stop fluids, vomiting causes more dehydration. Switch to external cooling (wet towels/ice) and go to the ER for IV fluids.
“They are aggressive and refusing help.” The trap: thinking they are just being difficult. The fix: recognize delirium, aggression is a symptom of the brain cooking (heat stroke). Do not argue, call 911 and treat it as a medical emergency, not a behavioral issue.
Next Steps
- Print the wet/weak vs. dry/delirious card and stick it on the fridge, because triage happens faster when the chart is not in memory.
- Stage the cooling tools together: ice packs in the freezer, spray bottle, and a tarp you could deploy in ninety seconds.
- Read Part 5: Hot car next, because the fastest heat emergency in America happens in a parked car, and it is entirely preventable with two habits.
Originally adapted from public CDC and EMS heat-illness guidance (public domain).