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Biomedical subjects

F B Davis

Publications and source records attributed to F B Davis.

84 records · Page 5Linked to original sources
PubMed1975

Outpatient management of anticoagulation.

The Anticoagulation Service insures uniformity of approach to the regulation of anticoagulation for patients of hospital-based primary physicians. There has been no anticoagulant-related mortality in 254 patient treatment-years, and the major complication rate is 4% of treatment courses. There is a relatively low complication rate because of the systematic approach to anticoagulation therapy, recognition of the importance of patient education, communication with the primary physician, and flexibility of drug dosage and patient visit regimens. Achieving the therapeutic range of the prothrombin time with minimum complications is the goal of this Service. The hallmark of adequate control is predictable response of the prothrombin time to adjustments in drug dosage. Statistical analysis of six years' experience has provided support for the thesis that control of anticoagulation and incidence of complications are not significantly altered by patient age, sex, or the presence of concurrent nonthromboembolic medical illness.

Administration, Oral↗
PubMedDate not supplied

Factors moderating the effect of oral sulfonylureas on free water clearance.

The effects of the antidiuretic agent chlorpropamide and the diuretic agent tolazamide on solute-free water clearance (CH2O) were compared in noninsulin-dependent diabetic patients undergoing water diuresis. Hyperglycemia (fasting serum glucose above 200 mg/dl) obscured the effects of these two sulfonylureas on CH2O. Thiazide or ethacrynic acid enhancement of chlorpropamide antidiuresis was also blunted by hyperglycemia and attendant osmotic diuresis. Thus, the low incidence of symptomatic hyponatremia during chlorpropamide treatment of diabetic patients may be explained by persistent hyperglycemia in such patients.

Aged↗
PubMedDate not supplied

Studies on the mechanism of thyroid hormone stimulation in vitro of human red cell Ca2+-ATPase activity.

The stimulation in vitro of human red blood cell Ca2+-ATPase activity by thyroxine (T4) and triiodothyronine (T3) in physiological concentrations is shown to depend upon binding of iodothyronines to red cell membranes. Calmodulin enhances the activity of thyroid hormone in this model system but there is no direct interaction of calmodulin and hormone.

Calcium-Transporting ATPases↗
PubMedDate not supplied

Increased plasma IGF-1 levels but lack of changes in adipocyte glucose transport in weanling rats with dorsomedial hypothalamic nucleus lesions 1 year after lesion production.

Experimental destruction of the dorsomedial hypothalamic nuclei (DMN) in weanling rats exerts an antiaging effect by preventing microalbuminuria and kidney lesions both 1 month and 1 year after lesion production. In the present study we report further on antiaging effects of DMN lesions (DMNL) by measuring glucose transport into adipocytes and plasma levels of insulin-like growth factors 1 and 2 (IGF-I, IGF-II). Male and female weanling Sprague-Dawley rats received bilateral electrolytic lesions in the DMN; sham-operated animals served as controls (SCON). The rats were maintained for 1 year and food intake was measured 3 weeks after surgery and 3 weeks prior to sacrifice. As expected, DMNL resulted in profound reductions of body weight and food intake, with male DMNL rats showing higher body weights and body weight gains than their female counterparts. The same was true of the respective SCON. In male DMNL rats, carcass fat in absolute terms was significantly reduced vs. SCON, but it was comparable among all groups when expressed in percent. Lean body mass (LBM), although significantly reduced in absolute terms in DMNL rats vs. SCON, was, however, significantly higher in male DMNL vs. SCON when expressed in percent, but not in females. LBM laid down per food energy taken in was higher in DMNL rats of both sexes than in their respective SCON. Efficiency of food utilization was normal in male DMNL vs. male SCON but was higher in female DMNL vs. SCON. Both male and female DMNL rats had significantly higher plasma IGF-1 concentrations than their respective SCON, and male DMNL rats had higher values than female DMNL rats. Plasma concentrations of IGF-II were significantly higher in DMNL vs. SCON, but only in females. Under both basal and insulin-stimulated conditions, DMNL rats had normal 3-0-methylglucose flux in adipocytes from epididymal fat pads vs. SCON. However, DMNL and SCON responded similarly to the stimulating effect of insulin. Although one-year-old rats may not be considered "aged", we do consider the observed lack of a drop in plasma IGF-I levels that occurs with aging as an "anti-aging" effect of DMN lesions.

Adipocytes↗