Status epilepticus in prehospital care: why the clock is your first treatment decision

Most seizures stop on their own, often before the ambulance arrives. That's why it's easy to fall into a wait-and-see habit. Status epilepticus in prehospital care is the exception that punishes the habit: a seizure that doesn't stop, or keeps coming back, and gets harder to stop with every minute that passes.

This piece walks through the protocol logic in general terms: why time drives every decision, why benzodiazepines come first, how to protect the airway during and after, and which causes you should look for before you leave the scene. Your service's medical directives and the provincial ALS and BLS standards set the specifics.

#Why time matters in status epilepticus

Older definitions used a long time window before calling a seizure "status". Modern guidelines have moved earlier. The American Epilepsy Society guideline treats a convulsive seizure lasting five minutes or more, or recurrent seizures without return to baseline in between, as status epilepticus that needs treatment.

The reason is practical. A seizure that has lasted five minutes is unlikely to stop on its own soon, and prolonged seizures tend to become less responsive to first-line drugs as they continue. In other words, delay doesn't just extend the problem. It makes the problem harder to fix.

For paramedics, this means:

• Start the clock as early as you can. Ask bystanders when it began, and be sceptical of estimates; frightened witnesses often get timing wrong in both directions.
• Treat on arrival if the seizure is already prolonged. You don't need to watch it for another five minutes yourself.
• Count repeated seizures together. A patient who seizes, partly wakes, then seizes again without returning to normal is in status, even if each event is short.

#The benzodiazepine-first principle

Across the major guidelines, a benzodiazepine is the first-line treatment for status epilepticus. The principle is simple: give it early, give it by a route you can actually achieve, and give it at an adequate dose.

The route question matters on the road. Establishing IV access in a convulsing patient takes time and may fail. The RAMPART trial, a large prehospital study, found that intramuscular midazolam given by paramedics was at least as effective as intravenous lorazepam for stopping seizures before hospital arrival. That finding helped shift many systems toward routes that don't depend on an IV.

What this means in practice depends entirely on your directives:

• Which benzodiazepine you carry and which routes you're authorized to use (intramuscular, intranasal, buccal, intravenous or intraosseous)
• The dose for adults and for children, and whether a repeat dose is permitted
• When to contact a base hospital physician

Two common errors are worth naming. One is under-dosing because of worry about breathing; an inadequate dose often fails and leads to more total drug later. The other is waiting for IV access when a faster route is available. Both cost time.

#Airway during and after the seizure

The airway plan has two phases, and they're different.

During the seizure, you're usually limited to basic measures. Protect the patient from injury, give oxygen, position them to help secretions drain where possible, and suction as needed. Don't force anything between the teeth.

After the seizure stops, the risks change. Benzodiazepines and the post-ictal state together can depress breathing and airway tone. Watch for:

• Snoring or gurgling respirations that need repositioning or suction
• Slow or shallow breathing that may need assisted ventilation
• Vomiting with a risk of aspiration
• Falling oxygen saturation or, where available, rising end-tidal carbon dioxide

Most patients will breathe adequately with positioning, an airway adjunct and oxygen. A smaller number will need ventilation support. Have the bag-valve-mask ready before you give the drug, not after.

#Causes to look for: glucose first

Status epilepticus is a symptom, and some causes can be treated on scene. A short, structured search pays off.

• Blood glucose. Check it in every seizing patient. Hypoglycaemia can cause seizures that won't settle properly until the glucose is corrected. Treat per your directives.
• Known epilepsy. Ask about missed medication, recent dose changes, illness or sleep loss.
• Head injury. Look for signs of trauma, especially in older patients or anyone on anticoagulants.
• Toxins and withdrawal. Consider overdose, alcohol withdrawal and drug ingestion. Look at the scene.
• Eclampsia. In a pregnant or recently postpartum patient, seizures may be eclamptic and need a different treatment pathway. Ask, and check your directives.
• Infection and fever. In children, febrile seizures are common; in anyone, consider meningitis or sepsis.

Hand all of this over clearly. The receiving team will build on the cause you identified, or rule out.

#For training leads

Seizure calls are frequent enough that crews feel comfortable with them, and that comfort is where status epilepticus slips through. The decisions worth drilling are about timing and judgement, not about recalling a drug name.

Scenario ideas that tend to expose gaps:

• A bystander who gives a vague onset time, forcing the learner to decide whether to treat now
• A failed IV attempt with the seizure ongoing, to test whether the learner switches route
• A post-ictal patient whose breathing slowly worsens after the benzodiazepine
• A seizure with a low glucose reading buried in the history

Short, repeated scenario practice, the kind Imedica is built around, helps crews rehearse the timing decisions so they happen automatically under pressure. Debrief on "when did you decide to treat, and why?" as well as on what was given.

#Takeaway

In status epilepticus, the clock is the first clinical decision. Recognize it early, give a benzodiazepine promptly by the most achievable route your directives allow, prepare for the airway problems that follow, and check glucose every time. Prehospital care that gets these right gives the patient the best chance of the seizure stopping before it becomes harder to treat.

Drafted for Imedica Field Notes. Physician review of this article is pending.