Urodynamic analysis of differential sacral nerve blocks and sacral neurectomy

Urodynamic analysis in 17 patients after long-acting anaesthetic root blocks of S2-S4 has shown that it is possible to increase bladder capacity and reduce uninhibited contractions without significant adverse effects on sphincter function. Satisfactory voiding dynamics are observed after blocks. This has provided a physiological rationale for selective sacral neurectomy in eight patients. Initial improvement after operation has been noted in seven cases.