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Biomedical subjects

K Stone

Publications and source records attributed to K Stone.

At least 73 records · Page 4Linked to original sources
PubMed1987

Regulation of glycogen synthase and phosphorylase activities by glucose and insulin in human skeletal muscle.

We examined the insulin dose-response characteristics of human muscle glycogen synthase and phosphorylase activation. We also determined whether increasing the rate of glucose disposal by hyperglycemia at a fixed insulin concentration activates glycogen synthase. Physiological increments in plasma insulin but not glucose increased the fractional activity of glycogen synthase. The ED50: s for insulin stimulation of whole body and forearm glucose disposal were similar and unaffected by glycemia. Glycogen synthase activation was exponentially related to the insulin-mediated component of whole body and forearm glucose disposal at each glucose concentration. Neither insulin nor glucose changed glycogen phosphorylase activity. These results suggest that insulin but not the rate of glucose disposal per se regulates glycogen synthesis by a mechanism that involves dephosphorylation of glycogen synthase but not phosphorylase. This implies that the low glycogen synthase activities found in insulin-resistant states are a consequence of impaired insulin action rather than reduced glucose disposal.

Adult↗
PubMed1986

Court-ordered removal in severe child maltreatment: an association to parental major affective disorder.

The authors report on a study of psychiatric diagnoses in parents whose children had been removed from their custody by court order because of child abuse and neglect. Compared to a similar group of parents who had not had children removed, the subject parents had a significantly greater lifetime incidence of affective disorders by Research Diagnostic Criteria (RDC) prior to their court involvement. Very few of these disorders had been rigorously diagnosed before or treated psychiatrically.

Adult↗
PubMed1986

Use of a general medical setting to teach medical students about neurosis.

A new way of teaching medical students about minor psychiatric illnesses is described. Psychiatric morbidity on general medical wards was identified, using medical students to administer the screening instrument to all routine admissions and interview possible cases. This was linked to a weekly teaching round in the same setting conducted by a psychiatrist. Advantages of this method of teaching were (1) it increased the overall numbers of patients clerked by our students during their psychiatric clerkship; (2) it increased the number of cases of neurosis seen by students as compared with psychotic illnesses; and (3) it related teaching on psychiatric conditions to settings where most students would eventually practise. The aim was both to increase the students' factual knowledge about minor psychiatric illnesses as encountered in these settings, and to improve their skills at identifying and treating such illnesses. An attempt was made to measure the effectiveness of this teaching method. All students showed an improvement in test scores, whether taught under the new regime or not, but it proved impossible to distinguish those taught on medical wards from those taught primarily in psychiatric wards. The implications of this finding are discussed. There was uniformly positive feedback from the students who took part in the study.

Clinical Clerkship↗
PubMed1986

Presacral neurectomy for chronic pelvic pain.

Over an eight-year period, 50 presacral neurectomies were performed at Madigan Army Medical Center for chronic pelvic pain failing response to medical management. Each hospital record was reviewed and 45 patients answered a questionnaire grading the severity of their pain from 0 to 10 for dysmenorrhea, dyspareunia, and other pelvic pain before and after surgery. The results showed success rates of 73% in relieving dysmenorrhea, 77% in relieving dyspareunia, and 63% in relieving other pelvic pains. The addition of a bilateral uterosacral ligament resection to the presacral neurectomy did not increase the success rate. There was an 18% lateral pelvic pain recurrence rate, and no recurrence of dysmenorrhea. Complications occurred in 4%.

Adolescent↗
PubMed1985

Preadolescent alcohol abuse and dependence.

The authors document 10 cases of children who met the criteria for a DSM-III axis I diagnosis of alcohol abuse or dependence by the age of 13. They present one case report to demonstrate the family history of affective disorder, especially bipolar disorder, and alcoholism that characterized these 10 patients. Most of the children with bipolar disorder responded well to psychotropics. The authors suggest that there may be a relationship between early-onset alcohol abuse and the development of major affective disorders in adolescence.

Adolescent↗
PubMed1985

Nurse profile.

Explore the source record for details and available documents.

Child↗
PubMed1984

Correlation between muscle glycogen synthase activity and in vivo insulin action in man.

We have studied the relationship between in vivo insulin-mediated glucose disposal rates, muscle glycogen content, and muscle glycogen synthase activity in 25 southwest American Indians with normal glucose tolerance and with varying degrees of glucose intolerance. Insulin-mediated glucose disposal (M) was measured by using the hyperinsulinemic euglycemic clamp technique at plasma insulin concentrations of 134 +/- 7 and 1709 +/- 72 microU/ml, with simultaneous indirect calorimetry to assess glucose oxidation and storage rates. Muscle glycogen content and glycogen synthase activity were measured in percutaneous muscle biopsy samples obtained from the vastus lateralis muscle before and after the euglycemic clamp procedure. The results showed that muscle glycogen synthase activity at the end of the euglycemic clamp was well correlated with insulin-mediated glucose storage rates at both low (r = 0.50, P less than 0.02) and high (r = 0.78, P less than 0.0001) insulin concentrations; and also correlated with M (r = 0.66, P less than 0.001 and r = 0.76, P less than 0.0001). Similar correlations were observed between the change in muscle glycogen synthase activity and glucose storage rates and M. The change in muscle glycogen synthase activity correlated with the change in muscle glycogen content (r = 0.46, P less than 0.03) measured before and after the insulin infusions. The change in muscle glycogen content did not correlate with glucose storage rates or M. The data suggest the possible importance of glycogen synthesis in muscle in determining in vivo insulin-mediated glucose disposal rates in man.

Adolescent↗
PubMed1983

Functional health status levels of primary care patients.

A cross-sectional study was conducted on functional status of adults visiting primary care practices. Limitations in physical and mental function were assessed independently in 28 practices by patients (N = 1,227) and physicians (N = 47) using a simple global index of disability. Results indicated 12% of patients rated their physical limitations as major and 8% rated major emotional limitations during the past month. Comparable assessments by physicians were 5% and 4%, respectively. Differences between patients and physicians were statistically significant and are demonstrated to be clinically relevant. Patients' functional limitations were associated with increased utilization of ambulatory care, older age, lower level of education, unemployment, and a primary diagnosis of a chronic condition. We conclude that functional status can be routinely recorded in medical practice to help describe severity, predict utilization, and improve the physician-patient relationship.

Activities of Daily Living↗
PubMed1983

Primary hepatocellular carcinoma following non-A, non-B posttransfusion hepatitis.

In 1964 a 42-year-old woman was hospitalized with clinical and laboratory signs of posttransfusion hepatitis five weeks after administration of six whole blood transfusions. During the following 17 years anicteric chronic liver disease was repeatedly documented by elevations of serum aspartate aminotransferase (SGOT) and alkaline phosphatase enzymes. In 1981 hepatomegaly, progressive jaundice, and a serum alphafetoprotein level of 516,000 ng/ml were observed. Percutaneous liver biopsy showed a primary hepatocellular carcinoma (PHC). Serologic examinations failed to reveal markers for hepatitis B virus including HBsAg, anti-HBs, and anti-HBc by radioimmunoassay; antibody to hepatitis A virus was also absent. This sequence of events demonstrates a presumptive association of PHC and the agent(s) of non-A, non-B viral hepatitis.

Alkaline Phosphatase↗
PubMed1983

Conceptual and methodologic issues in the evaluation of children's satisfaction with their mental health care.

The assessment of client satisfaction has become an important aspect of evaluation research in the adult mental health field, but there has been relatively little extension of that approach to the child client population. This is due to the lack of adequate methodologies for assessing treatment satisfaction in children and to the overriding conceptual issues which make it difficult to develop such measures. Further information is needed to clarify developmental differences in the way both healthy as well as medically and psychiatrically ill children conceptualize illness and treatment. The authors suggest that specific methodologies for assessing child satisfaction with treatment can be systematically developed once a more explicit developmental framework has been delineated in the area of children's understanding of medical and psychiatric disorders and their treatments.

Child↗
PubMed1982

The anti-allergic activity of Benoxaprofen [2-(4-chlorophenyl)-alpha-methyl-5-benzoxazole acetic acid]--a lipoxygenase inhibitor.

Benoxaprofen [2-(4-chlorophenyl)-alpha-methyl-5-benzoxazole acetic acid], a novel anti-inflammatory compound, is also an orally-active anti-allergic compound in animals. It reduced the anaphylactic release of mediators, particularly slow-reacting substance of anaphylaxis (SRS-A), from both in vitro and in vivo animal models. Benoxaprofen marginally antagonized the activity of histamine on the guinea pig ileum, but not of SRS-A, at concentrations which inhibited the release of SRS-A.

Anaphylaxis↗
PubMedDate not supplied

Identification of adducts formed by reaction of guanine nucleosides with malondialdehyde and structurally related aldehydes.

Malondialdehyde and a series of acrolein derivatives substituted in the beta-position with good leaving groups react with guanine and guanine nucleosides to form two different types of adducts. The reaction with guanosine is typical. One adduct exhibits ultraviolet absorbance maxima at 253, 319, and 348 nm and is fluorescent. Its NMR spectrum exhibits three new aromatic proton resonances derived from malondialdehyde. The mass spectrum exhibits an M + 1 at 320. The spectroscopic properties are consistent with the structure, 3-beta-D-erythro-pentofuranosyl-pyrimido[1,2-alpha]purin-10(3H)-one (PyP-ribose). The second guanosine adduct is an equal mixture of diastereomers that exhibit ultraviolet maxima at 217 and 244 nm and mirror image circular dichroism spectra. The NMR spectrum and mass spectrum (M + 1 = 392) indicate the addition of two molecules of MDA to one molecule of guanosine. Two-dimensional NMR (COSY) analysis reveals the presence of propano and enal functionalities. The spectroscopic and chemical properties suggest an oxadiazabicyclo[3.3.1]nonene structure that is confirmed by X-ray crystallography. Comparison of the deoxyguanosine adducts of malondialdehyde to those of the structurally related carbonyl compounds, methyl glyoxal and acrolein, provides a structural basis to explain the unique ability of malondialdehyde to induce frameshift mutations in bacterial mutagenesis systems.

Acrolein↗
PubMedDate not supplied

Investigation of the adducts formed by reaction of malondialdehyde with adenosine.

Malondialdehyde (MDA) forms oligomeric adducts with DNA bases. It has been proposed that the 2:1 MDA-guanosine (M2G) and 3:1 MDA-adenosine (M3A) adducts result from sequential addition of MDA molecules to the nucleoside base. Reaction of 1:1 MDA-guanosine (M1G) and 1:1 MDA-adenosine (M1A) adducts with MDA does not produce the multimeric adducts. This suggests they arise by reaction of the nucleoside bases with oligomers of MDA. If so, the proposed structure for M3A is inconsistent with the addition of an MDA trimer to adenosine. Therefore, we investigated the structure of this molecule. Two-dimensional double quantum filtered COSY and hetero-COSY NMR experiments were performed, and a series of insensitive nuclei assignment by polarization transfer (INAPT) NMR spectra were also recorded. The results of these experiments revealed the presence of a propano group and two alpha,beta-unsaturated aldehydes. The UV spectrum of M3A displayed a maximum at 326 nm, similar to that of N6-[3-oxo-1(E)-propenyl]adenosine (M1A). The adducts were reduced with sodium borohydride for comparison of the UV and NMR spectra. On the basis of our results, a new structure for M3A is proposed which is tentatively named 6(5*,7*-diformyl-2*H-3*,6*-dihydro-2*,6*-methano-1*,3*-oxazocin -3*-yl)-9-beta-D-ribofuranosylpurine.

Adenosine↗