Biomedical subjects

A Yeager

Publications and source records attributed to A Yeager.

23 records · Page 2Linked to original sources

PubMed1986

Prevalence of sensorineural hearing loss in premature and sick term infants with perinatally acquired cytomegalovirus infection.

Audiologic follow-up was obtained on 40 premature or sick term infants with perinatally acquired cytomegalovirus (CMV) infection and on 40 prospectively matched control subjects. Final evaluation was postponed until 3 years of age to assess any long-term hearing sequelae of perinatal CMV infection in this population, and to obtain reasonably complete audiometric results. One experimental subject had a bilateral sensorineural hearing loss above 4000 Hz. Four control subjects had sensorineural hearing losses, three requiring binaural hearing aids. The prevalence of confirmed hearing loss requiring amplification (3.75%) in this study group was consistent with that observed in all graduates of the Intensive Care Nursery who were considered at risk for hearing loss in the same time period (4.2%). These data suggest that perinatally acquired CMV infection is not associated with significant sensorineural hearing loss in premature or full term infants through age 3.

Cytomegalovirus Infections↗

PubMed1983

Neonatal herpes simplex virus infection: follow-up evaluation of vidarabine therapy.

An open study of vidarabine (adenine arabinoside) therapy was performed to verify the mortality from neonatal herpes simplex virus infection and to define further long-term morbidity. A total of 39 babies not previously reported were treated with either 15 mg/kg/d (16 newborns) or 30 mg/kg/d (23 newborns) of vidarabine administered intravenously for ten to 14 days. Outcome was compared with that from 56 newborns evaluated in a prior trial. Irrespective of the dose of medication, therapy decreased the mortality in babies with disseminated and CNS disease to 40%. The extent of organ involvement and, in particular, pulmonary herpes simplex infection were predictive of mortality (P = .001, for both). For these babies, 32% achieved normal developmental milestones 2 years after therapy. Disease localized to the skin, eye, and/or mouth was not associated with death. However, neurologic impairment occurred in 12% of this treated group of newborns. These findings underscore the value of vidarabine therapy of neonatal herpes simplex virus infection. However, an increase in dosage did not appear to result in significant improvement in either mortality or morbidity. Further improvement in the mode of therapy and the utilization of more potent antiviral drugs are currently being tested.

Antibodies, Viral↗

PubMedDate not supplied

New graft materials and current approaches to an acceptable small diameter vascular graft.

Prosthetic graft material has not been successful for small artery bypass. Mechanical, cellular, and humoral factors have all been implicated as a cause of failure. In vitro, ex vivo, and in vivo methods have been developed to assess platelet and fibrinogen deposition, measure compliance, and study other factors theorized to relate to graft failure. Cell culture techniques have been used to determine the role of cellular mitogens. The goal of an arterial substitute that can maintain patency in a 3-4 mm diameter low-flow configuration and that is not associated with the development of anastomotic hyperplasia has yet to be reached. A variety of solutions are being researched. New nonthrombogenic polymers are being tested as are new coatings for standard materials. Endothelial cell seeding has been accomplished in animals and is being tried in human clinical studies. Problems and results of endothelial seeding trials are reviewed. Other biologic approaches include the in vitro construction of a blood vessel model using cell coculture techniques and the implantation of bioabsorbable prosthetics into animals. The role of pharmacologic agents in maintaining graft patency is addressed.

Animals↗

PubMedDate not supplied

Tenoscopic examination and proximal annular ligament desmotomy for treatment of equine "complex" digital sheath tenosynovitis.

OBJECTIVE: To determine the outcome of horses with "complex" digital tenosynovitis treated by tenoscopic proximal annular ligament desmotomy and resection of synovial masses or adhesions, or both, within the digital sheath. STUDY DESIGN: Retrospective evaluation. ANIMALS OR SAMPLE POPULATION: Twenty-five horses with a clinical and ultrasonographic diagnosis of palmar or plantar proximal annular ligament constriction and ultrasonographic evidence of synovial masses or adhesions within the digital tendon sheath. METHODS: Each horse had tenoscopic surgery for annular ligament desmotomy combined with adhesiolysis and/or synovial mass resection. Mean follow-up time was 3.4 years. Spearman's rank correlation was used to assess the relationship between functional outcome or cosmetic results and preoperative variables including duration of clinical signs, digital sheath synovial fluid total protein concentration and nucleated cell count, thickness of the palmar or plantar proximal annular ligament (PAL), severity of adhesions, severity of synovial masses, degree of synovial distention, or limb affected. RESULTS: A total of 18 (72%) horses returned to athletic soundness, 4 were improved but not sound, and 3 were not improved. Cosmetic outcome was normal in 10 horses, improved but not normal in 12, and not improved in 3 horses. Cosmetic and functional outcome were significantly adversely affected by the duration of clinical signs and the severity of synovial masses. CONCLUSIONS: With appropriate tenoscopic surgical attention, horses with complex tenosynovitis syndrome characterized by synovial masses, adhesions, or both adhesions and masses, and PAL constriction, have a good prognosis for return to athletic soundness. CLINICAL RELEVANCE: Horses with PAL constriction and additional digital tendon sheath pathology such as adhesions and synovial masses have a 72% chance of returning to sound athletic performance, however 60% of horses retain some degree of cosmetic blemish in the affected limb. There is an inverse relationship between the duration of clinical signs and outcome, and therefore, prompt surgical attention is advised.

Animals↗

PubMedDate not supplied

Hemothorax in 2 horses.

This report documents the successful conservative medical management of hemothorax in 2 horses. Hemothorax occurred after a lung biopsy procedure (horse 1) and strenuous exercise on a treadmill (horse 2). The horses had tachypnea, tachycardia, nostril flaring, hemoptysis, and pawing. Hemothorax was suspected based upon absence of auscultable ventral lung sounds; development of cool extremities and pale, tacky mucous membranes; the ultrasonographic appearance of moderate to severe amounts of pleural fluid; and a concurrent decrease in hematocrit and total plasma protein. Both horses were treated successfully by intranasal administration of oxygen, intravenous administration of balanced polyionic solutions, and treatment with antibiotics, nonsteroidal anti-inflammatory drugs, and analgesics. In neither case was pleural blood removed. The hemothorax resolved in both horses without lasting abnormalities. Hemothorax does not require drainage for successful resolution.

Analgesics↗