Enz TJ, Papazoglou A, Tappeiner C, et al. - In this pilot study, researchers sought to investigate the feasibility of minimally invasive needle manometry for direct measurement of orbital compartment pressure under reproducible conditions in an in vivo model of orbital congestion, as well as to assess intraocular pressure and proptosis as indicators for elevated orbital compartment pressure. In 20 patients undergoing cataract surgery under local anesthesia, 7 ml of mepivacaine 2% solution was injected into the orbital compartment. Needle manometry appears to be a feasible minimally invasive instrument for directly measuring orbital compartment pressure, with potential for more widespread use in the management of orbital compartment syndrome. The findings also suggest that elevated intraocular pressure and proptosis are useful indicators of orbital compartment syndrome.