The<unk>  technique is used to create a conduction block in nerve or muscle fibers. A high concentration of<unk>  is applied to the extracellular space, which prevents the correct opening and closing of sodium and potassium channels, increasing resistance between two groups of cells. It was originally developed by Robert Stämpfli for recording action potentials in nerve fibers, and is particularly useful for measuring irreversible or highly variable pharmacological modifications of channel properties since untreated regions of membrane can be pulled into the node between the<unk>  regions.
Sucrose gap
Osmol gap
Lactate threshold
Urea reduction ratio
Anion gap
Lecithin–sphingomyelin ratio
Evans formula
Stool osmotic gap