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Biomedical subjects

J L Norris

Publications and source records attributed to J L Norris.

35 records · Page 2Linked to original sources
PubMed1981

Intraocular endoscopic surgery.

We have successfully used a new small endoscope in posterior segment surgery in situations where the operating microscope or binocular indirect ophthalmoscope provided an inadequate view. In this series of 18 procedures, we preformed posterior vitrectomies, removed retained foreign bodies, and reattached persistent retinal detachments. The only major complication was a retinal detachment. Learning to use a monocular system requires practice and preparation with experimental animals.

Adolescent↗
PubMed1981

Endoscopic orbital surgery.

Orbital endoscopy is useful in managing various types of orbital problems. A hand-held endoscope can be used for simple procedures. Surgery and prolonged observation require a mounted endoscope. These two techniques provided good results in 15 patients. Endoscopy proved useful in finding and removing orbital foreign bodies. It is potentially useful in the management of orbital tumors, but experience in this area is still limited.

Adolescent↗
PubMed1981

Comparison of radionuclide and contrast ventriculography for detection and quantitation of regions of myocardial ischemia in dogs.

Radionuclide and contrast ventriculography were evaluated for their ability to estimate myocardial ischemia. In 14 closed-chest, sedated dogs, a small and larger region of ischemia were produced by inflating balloon occluders on the left anterior descending coronary artery. The systemic arterial pressure, atrial-paced heart rate, global ejection fraction by radionuclide and contrast ventriculography, regional wall-motion abnormalities (as the percentage of abnormally contracting segments), and regional myocardial blood flow (using the microsphere technique) were measured during an initial control period, two separate ischemic periods, and a final control period. The regional ischemic weights based on myocardial blood flow ranged from 0 to 38.5 g and were grouped as zero, small (range 0 to less than 10 g, mean 3.40 g), and large regions of ischemia (greater than 10 g, mean 24.8 g). Regional wall-motion abnormalities were sensitive qualitative indicators of ischemia. Receiver operating characteristic analysis showed that both ventriculographic methods were highly sensitive, specific, and accurate for detecting regional ischemia. Contrast ventriculography was slightly superior for detecting small regions less than 4 g, but the methods were equal for regions greater than 4 g. The arterial pressure and heart rate were unchanged during ischemia. For small regions of ischemia, the global ejection fraction did not fall using either the contrast or radionuclide technique, but it fell significantly when large regions were produced. There was a quantitative relationship between the percentage of abnormally contracting segments and the grams of myocardial ischemia (for radionuclide ventriculography, r = 0.65, P = 0.003, and for contrast ventriculography, r = 0.75, P less than 0.001), but for many small regions of ischemia, wall-motion changes were greater than anticipated, suggesting hypofunction of the continguous normal tissue. This study demonstrated that both radionuclide and contrast ventriculography were quite sensitive and specific for detecting measured amounts of regional ischemia. The functional changes resulting from ischemia are quantitatively related to the extent of regional ischemia, small areas resulting in regional wall motion abnormalities, and large areas producing both reduced global ejection fraction and wall motion changes.

Animals↗
PubMed1979

Alcoholism today.

Explore the source record for details and available documents.

Alcoholics Anonymous↗
PubMed1979

Prophylactic photocoagulation of the fellow eye in exudative senile maculopathy. A preliminary report.

Information on the fate of the fellow eye in patients who have suffered loss of central vision in the first eye due to exudative senile maculopathy suggests that there is a high incidence of later loss of vision in the second eye due to the same disease process. It has been speculated that prophylactic photocoagulation of the macula in the fellow eye might have a protective effect. This is a preliminary report of a series of patients in which argon laser photocoagulation of the second eye has been performed.

Aged↗
PubMed1978

An endoscope for ophthalmology.

An endoscope with a 1.7-mm diameter shaft has unique properties of focus, magnification, and large field of view that make it useful for both orbital and intraocular surgery.

Evaluation Studies as Topic↗
PubMed1978

Prolonged hypotony following cataract extraction.

Hypotony after intracapsular cataract extraction was prolonged in 3 eyes because cyclodialysis clefts were inadvertently formed. One eye became normotensive with the topical application of corticosteroid; 2 required surgical intervention.

Anterior Chamber↗
PubMedDate not supplied

Tarsometatarsal subluxation in dogs: partial arthrodesis by plate fixation.

In a retrospective study of tarsometatarsal joint subluxation in eight dogs, secondary fractures were identified in six dogs, particularly of the fourth tarsal bone and the proximal fifth metatarsal bone. Common causes of tarsometatarsal joint injury included jumping or falling and direct trauma to the foot. Partial tarsal arthrodesis, with the use of bone-plate stabilization and cancellous bone grafting of joint spaces after removal of articular cartilage, led to progressive bone healing in all dogs. Implant breakage did not occur in any dog.

Animals↗