A comparative study of epidural and cisternal pressure in dogs.

The epidural and cisternal pressure was recorded simultaneously in eight dogs. Epidural pressure was monitored with a Ladd fiberoptic sensor, and the cisternal pressure via a Statham transducer and a Grass polygraphy. Various pressure levels were compared when mock cerebrospinal fluid was injected into the cisterna magna. The results were analyzed statistically and, within a range of 0 to 70 mm Hg, a high degree of correlation was found between the pressures of the two compartments (r = 0.96 to 1.0).