Changes in mean arterial pressure and end-tidal carbon dioxide content affect venous sinus pressures in patients with idiopathic intracranial hypertension: a randomized study.

Despite the small sample size, this pilot study demonstrates a dramatic effect of both MAP and EtCO2 on venous sinus pressures obtained during venography. These findings underscore the importance of maintaining normal physiologic cardiovascular and respiratory parameters during venous sinus manometry.