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Biomedical subjects

R O Jones

Publications and source records attributed to R O Jones.

At least 55 records · Page 3Linked to original sources
PubMed1987

Metabolic quotients and oxygen extraction across the uterus of the post-term pregnant rabbit under chronic steady-state conditions.

The extraction of oxygen by the uterus in the term rabbit has been found to be very high. During post-term pregnancy, the fetuses of the rabbit are approximately 40% larger, despite a reduction in placental weight of approximately 30%. The purpose of our study was to investigate the changes that occur in the maternal rabbit to allow survival of the fetus under these conditions. Post-term pregnancies were induced in 5 white New Zealand rabbits by injections of chorionic gonadotropin and progesterone on the 26th day of gestation. Catheters were placed surgically on day 28, and blood samples were taken daily from the femoral artery and uterine veins starting at day 31. Each sample was analyzed for pH, PCO2, PO2, oxygen capacity and saturation, glucose, beta-hydroxybutyrate, lactate and acetoacetate. Coefficients of extraction were calculated for oxygen and metabolic quotients were calculated for each substrate. These data are compared with those obtained for the term rabbit in previous studies. There was a significant increase in the coefficient of oxygen extraction in the post-term animals; however, the metabolic quotients across the uterus were not significantly different between the term and the post-term rabbit.

Animals↗
PubMed1985

Uterine and whole body oxygen extractions in the pregnant rabbit under chronic steady-state conditions.

Seventeen pregnant rabbits were studied under conscious, unstressed conditions after catheterization of the right ventricle (RV), a femoral artery (A), and a uterine vein (UV). Respiratory gas tensions, pH, and oxygen saturations and contents were determined serially throughout the latter half of gestation. The uterine coefficient of oxygen extraction increased with gestational age (R = 0.86) and became 60.6% +/- 0.3% during the last 4 days of pregnancy. To compare uterine perfusion with whole body perfusion in relationship to oxygen demands, the (Ao2 - UVo2/Ao2 - RVo2) ratio was computed. The ratio was greater than or equal to 1 after 20 days of gestation, which demonstrated that in regard to oxygen demands the rabbit uterus is relatively underperfused compared to the rest of the maternal organism in the last part of pregnancy. A comparison with analogous data in other species demonstrates that the pregnant rabbit, like the guinea pig, has a much lower rate of uterine blood flow than does the pregnant sheep. These interspecies differences in the perfusion rate and oxygen extraction of the pregnant uterus are related to differences in placental structure.

Animals↗
PubMed1984

A new complication of prosthetic ossicular reconstruction.

The use of synthetic partial ossicular replacement prostheses (PORPs) and total ossicular replacement prostheses (TORPs) in ossicular reconstruction surgery has gained growing acceptance but is not without complication. Dysgeusia, resulting from tension or stretching of the chorda tympani, was noted in two patients who had undergone such reconstruction. The symptoms resolved following resolution of the tension on the chorda tympani.

Adult↗
PubMed1984

Histiocytosis X of the head and neck.

Histiocytosis X is a general disease class for three less distinctive and overlapping states; namely, eosinophilic granuloma, Hand-Schuller-Christian disease, and Letterer-Siwe disease. These conditions span a continuum from an isolated bony or soft tissue lesion to a fulminant, disseminated process. The head and neck are frequent sites of initial presentation for the more serious varieties. We present four cases of histiocytosis X with lesions in the temporal bone, skull, and mandible. Some patients had accompanying scalp lesions as well as other distal bony and soft tissue lesions. Treatment included radiation therapy, chemotherapy, and surgery. A rational discussion of new treatment modalities based on stage of the disease is presented. Utilization of CT scanning in the initial diagnosis and follow-up is demonstrated. Management of troublesome otologic complications is also discussed.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1984

Severe hospitalized croup: treatment trends and prognosis.

We have reviewed 43 cases of severe croup admitted from 1977 to 1981 at North Carolina Memorial Hospital. All patients were treated with mist, 23 (54%) of 43 were treated with racemic epinephrine, but only 7 (16%) of 43 were treated with steroids. None of the 5 patients who required intubation received steroids. Nine (36%) of 25 patients available for at least 6 months of follow-up had subsequent clinical diagnoses of asthma. We have concluded that: 1. males with subglottic narrowing on x-ray, high leukocyte counts, and no steroid treatment appear to have increased need for airway support; 2. while humidification and racemic epinephrine are accepted forms of treatment, steroids are still rarely used even in severe croup; 3. severe croup may be a signal for the later development of asthma. Because it is difficult to predict which patients with severe croup will need later airway management, we strongly recommend that all patients with croup requiring racemic epinephrine be treated with at least a single dose of 1.0 to 1.5 mg/kg of dexamethasone.

Aerosols↗
PubMed1983

Revisional left ankle arthrodesis for pseudoarthrosis.

In this case study, a female patient who had poliomyelitis at 5 years of age complained of ankle pain on weightbearing and when walking. The authors describe the surgical procedure used following two previous unsuccessful attempts to arthrodese the left talocrural joint.

Adult↗