Handler Down in the Heat: Poisoning or Heat Illness?
July in Kentucky, 92 degrees F and 70% humidity. Your crew is applying an organophosphate insecticide to 60 acres of tobacco. The flagger has been on foot since 9 a.m., wearing cotton coveralls, no gloves, and no respirator, because "the respirator is too hot." At 2:30 p.m. he stops, sits down, and complains of dizziness, sweating, blurred vision, and nausea. His skin is soaked, his pupils look very small, and he is salivating heavily. He is awake and can talk. The tractor and the partially full 300-gallon tank are sitting at the field edge, and the rest of the crew is 200 yards away.
1. Walk through what you do in the first ten minutes and why, including how you tell heat illness from pesticide poisoning.
Read the worked answer
Treat it as pesticide poisoning until proven otherwise - the two look alike, and one kills faster.
Do this in order:
- Stop the job. Shut off the sprayer, keep everyone out of the treated area.
- Remove him from the source - get him out of the field, into shade, out of contaminated clothing. Cut the coveralls off rather than pulling them over his head.
- Wash him down with soap and water, copious amounts, including hands, forearms, face, and neck. Have someone get clean clothes.
- Call 911 and the poison control center. Tell them the product name, EPA registration number, and the exposure route. Send the label and SDS with him - the label is the treating physician's reference.
- Nothing by mouth unless he is fully alert and medical direction says so. Do not induce vomiting. Do not give anything "to settle his stomach."
Why the differential matters:
- Heat exhaustion gives heavy sweating, cool clammy skin, weakness, and a rapid weak pulse; heat stroke gives hot skin, confusion, and possibly no sweating.
- Cholinergic (organophosphate) signs are pinpoint pupils, heavy salivation and tearing, sweating, vomiting, diarrhea, bronchial secretions, slow heart rate, and muscle twitching.
- Pinpoint pupils plus heavy salivation in a man handling an organophosphate is poisoning until a physician says otherwise. Heat illness alone does not pin the pupils.
Do not do this: do not give atropine in the field. Atropine is a physician's decision, and it is harmful if the problem turns out to be heat stroke. Do not let the crew "let him sit in the truck and see how he feels." Organophosphate illness can progress fast and needs medical monitoring.
2. The rest of the crew still has 30 acres to finish and it is 95 degrees. What changes, and what does not?
Read the worked answer
The schedule and the engineering controls change. The PPE does not.
What does not change:
- The label's handler PPE is a condition of legal use. Heat is not an exception, and "the respirator is too hot" is not a defense. If the crew cannot work in the required PPE, the job does not run.
- Anyone who handles the concentrate or works within the label's restrictions needs the labeled gloves, coveralls, boots, eye protection, and respirator. Cotton coveralls soaked with sweat or spray are worse than useless - they hold the product against the skin.
What does change:
- Shift the work to early morning and evening, and stop during the worst heat. Plan the day around the heat index, not around the tank.
- Rotate people out of the flagging and mixing roles, and shorten exposure blocks.
- Water, shade, rest: cool water within reach, scheduled breaks, and a buddy system so no one works alone at a distance.
- Engineering controls: closed mixing and loading systems, a cab with a charcoal filtration system for the driver, and a change of clothing and wash water on site. Consider a less toxic formulation or a different product if the label allows - that is the legitimate way to reduce heat load, not dropping PPE.
- Decon supplies: soap, water, and towels at the mixing site, not in the truck at the office.
Then close the loop: report the incident per the state reporting requirement for pesticide illness, keep the medical records, and review why a handler was flagging in an organophosphate field without gloves and a respirator in the first place. If the crew works with organophosphates or carbamates regularly, ask the physician about a baseline and periodic cholinesterase monitoring.