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Biomedical subjects

C H Wright

Publications and source records attributed to C H Wright.

At least 19 recordsLinked to original sources
PubMed1995

Automated retinal robotic laser system.

Researchers at the University of Texas and the USAF Academy have worked toward the development of a retinal robotic laser system. The overall goal of this ongoing project is to precisely place and control the depth of laser lesions for the treatment of various retinal diseases such as diabetic retinopathy and retinal tears. Separate low speed prototype subsystems have been developed to control lesion depth using lesion reflectance feedback parameters and lesion placement using retinal vessels as tracking landmarks. Both subsystems have been successfully demonstrated in vivo on pigmented rabbits using an argon continuous wave laser. Recent efforts have concentrated on combining the two subsystems into a single prototype capable of simultaneously controlling both lesion depth and placement. We have designated this combined system CALOSOS for Computer Aided Laser Optics System for Ophthalmic Surgery. Following the dual-use concept, this system is being adapted for clinical use as a retinal treatment system as well as a research tool for military laser-tissue interaction studies.

Animals↗
PubMed1989

Diastematomyelia: prenatal ultrasonic appearances.

Four cases of in-utero diastematomyelia are presented and the ultrasonic features described. Characteristic findings are localised widening of the posterior ossification centres with a central echogenic focus at the point of widening, visible on coronal scanning, and absence of a posterior defect or soft tissue mass on transverse scanning. The aetiology and management of the condition is discussed. The cases illustrate that widening of the posterior ossification centres can occur in the absence of overt spina bifida and the prenatal detection of diastematomyelia will allow for early postnatal investigation and treatment.

Female↗
PubMed1984

Obstetric care in a health maintenance organization and a private fee-for-service practice: a comparative analysis.

This study compares the quality of obstetric care provided for patients in two distinct groups: a federally-qualified health maintenance organization and a private fee-for-service practice. Patients of both groups were delivered in the same hospital with resident coverage equally accessible to both groups. From January, 1979, through December, 1981, the period of the study, the physician group delivered 2385 patients, 57% of them from the health maintenance organization and 43% from the fee-for-service practice. Not only were comparisons of maternal and fetal outcomes available for the two patient groups, but the yearly trends and individual performances of the physicians were available as well. This paper addresses the question, all other things being equal, is the level of care and ultimate outcome the same for both groups of patients? The results in some instances showed surprising differences.

Adult↗
PubMed1983

The active management of prolonged labor.

There has been growing concern in the medical community about the rising rate of cesarean sections. Use of the modified manual rotation technique on the arrested fetal head has resulted in a decrease in the number of sections, length of hospital stay, and, consequently, the cost of care.No longer is it necessary to operate on every woman who comes to the end of the second stage of labor in the persistent occiput posterior or transverse arrest position. This technique also helps to reduce, if not eliminate, the more difficult and traumatic midforcep rotations and extractions.

Delivery, Obstetric↗
PubMed1980

Flow rate determination using computed tomography.

A method of measuring flow in a large vessel by using a CT scanner is described. It has been shown that this is a simple, accurate and reproducible method in an experimental model. Possible clinical applications and limitations of this method of measuring flow are briefly considered.

Blood Flow Velocity↗
PubMed1980

An approach to cost-containment in health care.

Economic and political repercussions throughout the nation follow the unprecedented rise in the cost of delivering health care. The physician is not only a part of the problem, but also must be an active part of the solution. The author presents an approach to cost containment in health care delivery.

Cost Control↗
PubMed1979

Computed tomographic and ultrasonic appearances of primary carcinoma of the common bile duct.

Two patients with obstructive jaundice due to surgically proved primary carcinoma of the common bile duct were examined by CT and ultrasound. The combination of the two modalities showed dilatation of the extrahepatic biliary system and the main pancreatic duct. The diagnosis of primary bile duct carcinoma is suggested by these findings in the presence of a normal pancreatic head, although similar findings may occur with a small pancreatic or ampullary carcinoma.

Adult↗
PubMed1979

Gray scale ultrasonic appearances of renal transplant rejection.

Ultrasonic examination of renal transplants with special attention to the parenchymal echo pattern has been undertaken in 43 patients. In the normal renal transplant, the pyramids, cortex and renal sinus can be distinguished. Renal transplant rejection is manifested by swelling and decreased echogenicity of the pyramids and hyperechogenic cortex. In addition, large anechoic areas due to hemorrhagic infarcts and necrosis are seen. In long-standing rejection, a normal or small-sized kidney with an irregular intrarenal echo pattern is observed. In 13 cases of acute tubular necrosis, none of the above appearances could be demonstrated. Serial ultrasonic scans are essential to reveal evolutionary changes of the rejection process.

Adolescent↗
PubMed1979

Grey-scale ultrasonic characteristics of carcinoma of the pancreas.

Fifty-five sonograms were performed on 25 cases of surgically and histologically proven carcinoma of the pancreas. The sonographic appearances of the tumour were determined. A diffuse echogenic pattern with irregular margin was the most common appearance. Displacement and indentation of the inferior vena cava and superior mesenteric vessels, greatly assist in localizing the tumour to the pancreas. A reliable prediction of tumour size and resectability cannot be determined by sonography alone. Sonography is helpful in assessing the response of unresectable pancreatic carcinoma to therapy. A more sonolucent appearance of the tumour occurs following chemotherapy.

Adult↗
PubMed1978

Grey scale ultrasonography in the diagnosis of ectopic pregnancy.

Grey scale pelvic ultrasonography was performed in 36 patients with suspected ectopic pregnancy and in 3 with pelvic mass and bleeding. Thirteen cases were diagnosed as extrauterine pregnancy which was confirmed at operation. There were one false-positive and 2 false-negative studies. The overall diagnostic accuracy was 92.3%. The major diagnostic criteria in unruptured ectopic pregnancy were an extrauterine gestational sac or fetus and an abnormal uterine echo pattern. In addition, a complex mass due to hematoma was seen in ruptured ectopic pregnancy. Chronic ruptured ectopic pregnancy simulated pelvic inflammatory disease and was difficult to diagnose.

Adolescent↗