Midazolam Worked Best For Adult Seizures Outside Hospital

What was studied

This study combined results from 14 previous studies of benzodiazepines used for status epilepticus in adults in out-of-hospital settings. In total, 2,803 adult patients were included. The researchers examined seizure cessation after treatment.

The main goal was not only to pool the results, but also to estimate what the results might look like in an "ideal" double-blind randomized trial. They used a method called target trial emulation to adjust for study design features, especially whether studies were open-label, meaning people knew which drug was given.

What they found

When the researchers pooled the studies in the usual way, the seizure cessation rate was 68.8%. After adjusting for study design bias, they estimated a rate of 64.9% under ideal blinded trial conditions. They found significant open-label bias, and estimated that traditional meta-analysis overestimated benzodiazepine efficacy by 3.9 percentage points.

In the comparison between medicines, midazolam was more effective than lorazepam and diazepam in the network meta-analysis. The analysis ranked midazolam highest, with lorazepam next and diazepam lowest. The abstract states that intramuscular midazolam demonstrated superior effectiveness compared with intravenous lorazepam and diazepam in adults with status epilepticus.

Limits of the evidence

This was a meta-analysis of existing studies, not a new clinical trial. The results depend on the quality of the included studies and on the assumptions used in the target trial emulation model.

The abstract does not give details about all patient differences, seizure causes, dosing, timing of treatment, or side effects. It only included adults in out-of-hospital settings, so the findings may not apply to children, in-hospital treatment, or all forms of status epilepticus. There was substantial variation between studies before adjustment.

For families and caregivers

For families, this study is consistent with benzodiazepines being used as first-line treatment for status epilepticus. It also suggests that midazolam, particularly intramuscular midazolam, may be more effective than lorazepam or diazepam in adults in out-of-hospital settings.

At the same time, the study indicates that some earlier research may have overestimated treatment effectiveness because of study design bias. This may help clinicians interpret the evidence, but the abstract does not address individual treatment decisions or emergency care plans.

What to watch next

More high-quality blinded trials in adults with out-of-hospital status epilepticus would help confirm these findings, and families can ask clinicians which emergency medicine and route of delivery are preferred for the specific seizure plan.

Terms in this summary

status epilepticus

A seizure that lasts too long or repeated seizures without recovery in between; it is a medical emergency.

benzodiazepines

A group of medicines commonly used to stop seizures quickly in an emergency.

meta-analysis

A study that combines results from multiple earlier studies.

randomized controlled trial

A study where people are assigned by chance to different treatments to compare them fairly.

double-blind

A study design where neither the patient nor the treating team knows which treatment was given, to reduce bias.

open-label

A study where the treatment is known to patients or researchers, which can affect results.

intramuscular

Given as an injection into a muscle.

intravenous

Given through a vein.