Chan, M T CSF progesterone and spread of subarachnoid anaesthesia in pregnancy. [electronic resource] - British journal of anaesthesia Aug 1996 - 293-4 p. digital Publication Type: Comment; Letter ISSN: 0007-0912 Standard No.: 10.1093/bja/77.2.293 doi Subjects--Topical Terms: Anesthesia, ObstetricalAnesthesia, SpinalFemaleHumansPregnancy--cerebrospinal fluidProgesterone--cerebrospinal fluid