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Auditory evoked potentials in response to tone bursts repeated at a rate of 40 per second (auditory 40-Hz responses) were studied in the guinea pig. The potentials, consisting of a sequence of 40-Hz waves with a periodicity of about 25 msec, were distributed widely over the skull, and the largest potentials were recorded from the vertex (midline) and the(More)
Hydrostatic pressure changes in endolymph as well as perilymph and cerebrospinal fluid (CSF) following intravenous injection of glycerol, urea, and mannitol were studied in the guinea pig using a servo-controlled micropipet system. After the initial rise in pressure observed during and immediately after injection of each hyperosmotic agent, all pressures(More)
PURPOSE Patients with von Hippel-Lindau disease may require repeat partial nephrectomies to avoid the need for renal replacement therapy. We evaluated outcomes in patients who underwent third or fourth partial nephrectomies on the same kidney, which we call salvage partial nephrectomy. MATERIALS AND METHODS We retrospectively reviewed the charts of(More)
BACKGROUND Intraoperative cholangiograms (IOCs) may increase cost, surgical time, and radiation exposure of staff and patients. The authors introduce the application of passive infrared imaging to intraoperative cholangiography as a feasible alternative to traditional fluoroscopic IOCs. METHODS A porcine model was used in which the gallbladder, cystic(More)
OBJECTIVES (1) To describe repair of complex orbital fractures using computer planning with preoperative virtual reconstruction, mirror image overlay, endoscopy, and surgical navigation. (2) To test the hypothesis that this technique improves outcomes in complex orbital fractures. METHODS A series of 113 consecutive severe orbital fracture cases was(More)
BACKGROUND Functional endoscopic sinus surgery (FESS) aims to improve quality-of-life (QOL). Perception of QOL can change according to one's current medical or emotional state. This is known as response shift. It can be measured by the "then-test," which asks patients to report pretreatment symptoms after receiving treatment. Patients often do not(More)
We studied the effect of urea, glycerol, and mannitol on basilar and labyrinthine arteries of dogs in vitro by use of tension recording methods. When the tissue was exposed to urea or glycerol, temporary relaxation of smooth muscles was initially observed, but was followed by gradually increasing contraction. With mannitol, relaxation of the smooth muscles(More)