The NerveBlock Index

The NerveBlock Index assesses when the thin unmyelinated skin sympathetic nerves are blocked by regional anaesthesia within seconds.

Main advantages:

The NerveBlock Index can be used to assess the nerve block in the extremities within 30 seconds when the unmyelinated skin sympathetic nerves are blocked by regional anaesthesia in 100 % of the patients. Other available tools use up to 15 minutes and do not show that the nerves are blocked in all patients after 20 minutes.

The Physiology:

The skin sympathetic nerves are without myelin (a protective layer). When regional anaesthesia is given, the activity in these nerves is blocked first and the effect is assessed on the extremity of the blocked nerve within seconds.

The existing device:

It is possible to choose among the different applications.

Within seconds, the NerveBlock Index shows that the peaks per second decreases and that the rise time decreases when the nerves in the extremity are blocked by regional anaesthesia.

A standalone monitor is available:

Assess the regional nerve block in extremities within 30 seconds when the unmyelinated skin sympathetic nerves’ activity is blocked by regional anaesthesia in 100 % of the patients by using the Skin Conductance NerveBlock Index.

The Med-Storm software can be installed on the PhilipsMX patient monitor with iPC, the Philips Intellevue, the Mindray patient monitor with iView and the bridge-solution (in process), and works on the Draeger Explorer (USB ports as it is basically a flat panel PC), and some Nihon Koden patient monitors.

Reference: Gungor S, Rana B, Fields K, Bae JJ, Mount L, Buschiazzo V, Storm H. Changes in the Skin Conductance Monitor as an End Point for Sympathetic Nerve Blocks. Pain Medicine 2017; 00: 1–11.