The changes in arterial blood pressure which occur during the different steps of thermocoagulation of the trigeminal ganglion and rootlets are reported. The arterial blood pressure of 54 patients with trigeminal neuralgia was recorded continuously by catheterization of the radial artery. The maximal values were recorded (a) during the analgesic-sedation stage; (b) when the electrode came into contact with the base of the cranium during movement of the needle towards the foramen ovale; (c) during Insertion of the electrode into the foramen ovale, and (d) during the thermocoagulation. One-way analysis of variance and Student''s t test were used for analysis of the data. There was a significant increase of arterial blood pressure during the various stages of thermocoagulation.
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