Peripheral nerve stimulator (train-of-four monitor)
A device that delivers a series of electrical stimuli (typically a train-of-four) to a peripheral nerve via surface electrodes and records or observes the resulting muscle response.
How it is used
Used to monitor the degree of neuromuscular blockade produced by muscle relaxants during general anesthesia, and to confirm adequate recovery before extubation.
Clinical tip
A train-of-four ratio (TOFR) of 0.9 or greater indicates full recovery of muscle strength and is considered the safe threshold for extubation.
Sources
This entry is part of the Instriq catalog, researched and written per specialty from real web research -- never generated or invented without verification -- and reviewed skeptically and independently before publication. How this catalog is written.
History
Added to the catalog on 2026-10-05.
Dates derived from the project's public version-control history on GitHub, not a live collaborative edit log.