Anaesthesia for a patient with Isaac's syndrome and myasthenia gravis.

Editor—We thank Dr Davies for his comment. All currently available spinal needles have Luer pattern connectors, and what he is recommending is the use of syringes and needles with Luer-lock connectors. We can appreciate that their use might reduce the risk of anterior or posterior displacement, but we note that he still invokes the qualification ‘hopefully’, so the user must still be aware of the risk.