Axonal sensitivity and block dynamics.

The role of differential nerve block in the development of analgesia after erector spinae plane block has been questioned. While highly myelinated nerves are more sensitive to local anesthetics than unmyelinated ones in vitro, factors influencing drug diffusion, particularly pKa, are more relevant in the clinical setting. Bupivacaine (the drug most used for an 'analgesic' effect) has a relatively high pKa (8.

James (Carrick) Moore (1763-1860): Another (Scottish) Local Anaesthetic Hero.

Modern technology has provided the author with access to a previously unobtainable publication, John Moore's 1784 work, ''. Not only did this allow direct consideration of his technique of nerve compression (which has been described briefly by many others since), but also showed that Moore had very advanced humane views on the need to try and produce pain relief for surgery. It also became possible to obtain far more information on the author, notably that although he worked in London he was born and educated in Glasgow, and did his initial medical training in Edinburgh.

W Harry Archer's collection of Horace Wells letters are still available. A commentary on a new publication.

The definitive account of the life and work of Horace Wells, the dentist from Hartford, Connecticut, who experimented with nitrous oxide anesthesia in 1844, is that published by W Harry Archer for the centenary of Wells's work. A major source of original material was a collection of letters, by Wells and others, that Archer found in the house in Hartford, Vermont, in which Wells was born. In later support for Wells being better recognized for his role in the introduction of general anaesthesia, Richard J Wolfe and Leonard F Menczer published a collection of essays in 1994.