Short-term effects of intravenous benzodiazepines on autonomic neurocardiac regulation in humans: a comparison between midazolam, diazepam, and lorazepam.

Objectives: To evaluate the effects of intravenously applied diazepam, lorazepam, and midazolam on autonomic neurocardiac regulation assessed by standardized measurements of heart rate variability.

Design: Prospective, randomized clinical study.

Setting: University teaching hospital.