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Biomedical subjects

D McKee

Publications and source records attributed to D McKee.

At least 19 recordsLinked to original sources
PubMed2004

High-dose vitamin E supplementation does not diminish ribavirin-associated haemolysis in hepatitis C treatment with combination standard alpha-interferon and ribavirin.

BACKGROUND: Ribavirin is associated with haemolytic anaemia. Antioxidants have been reported to decrease severity of this anaemia. AIM: To determine effect of vitamin E supplementation on ribavirin-associated haemolysis in chronic hepatitis C treated with standard alpha-interferon and ribavirin. METHODS: Fifty-one naive chronic hepatitis C patients were randomized to receive either alpha-interferon/ribavirin therapy (control) or therapy plus vitamin E 800 IU b.d. with 24-week follow-up. Alanine aminotransferase ALT, haemoglobin and reticulocyte percentage were monitored. Symptoms and health-related quality of life were also monitored at each visit. RESULTS: Forty-seven subjects were treated (27 vitamin E /20 controls). Thirteen withdrew because of adverse effects or non-compliance. Groups were similar in demographics, genotype and baseline lab indices. Comparison with baseline, treatment and follow-up values showed a significant haemoglobin and ALT reduction in both groups. There was no significant difference in haemoglobin and reticulocyte percentage between groups. Sustained viral response was not significantly different between vitamin E (11/18) and control (6/16) groups. Three patients required ribavirin dose-reduction in the vitamin E group compared with two controls. Health-related quality of life during and end-of-treatment was not different between groups. CONCLUSIONS: Vitamin E supplementation alone during standard alpha-interferon and ribavirin therapy does not appear to diminish ribavirin-associated haemolysis.

Adult↗
PubMed2001

Longitudinal electroproduction of charged pions from (1)H, (2)H, and (3)He.

Separated longitudinal and transverse cross sections for charged pion electroproduction from (1)H, (2)H, and (3)He were measured at Q(2) = 0.4 (GeV/c)(2) for two values of the invariant mass, W = 1.15 GeV and W = 1.60 GeV, in a search for a mass dependence which would signal the effect of nuclear pions. This is the first such study that includes recoil momenta significantly above the Fermi surface. The longitudinal cross section, if dominated by the pion-pole process, should be sensitive to nuclear pion currents. Comparisons of the longitudinal cross section target ratios to a quasifree calculation reveal a significant suppression in (3)He at W = 1.60 GeV. The W = 1.15 GeV results are consistent with simple estimates of the effect of nuclear pion currents, but are also consistent with pure quasifree production.

Journal Article↗
PubMed2001

Measurement of the high energy two-body deuteron photodisintegration differential cross section.

The first measurements of the d(gamma,p)n differential cross section at forward angles and photon energies above 4 GeV were performed at the Thomas Jefferson National Accelerator Facility (JLab). The results indicate evidence of an angular dependent scaling threshold. Results at straight theta(cm) = 37 degrees are consistent with the constituent counting rules for E(gamma) greater, similar 4 GeV, while those at 70 degrees are consistent with the constituent counting rules for E(gamma) greater, similar 1.5 GeV.

Journal Article↗
PubMed2001

Measurement of the charged pion electromagnetic form factor.

Separated longitudinal and transverse structure functions for the reaction 1H(e,e(')pi(+))n were measured in the momentum transfer region Q2 = 0.6--1.6 (GeV/c)(2) at a value of the invariant mass W = 1.95 GeV. New values for the pion charge form factor were extracted from the longitudinal cross section by using a recently developed Regge model. The results indicate that the pion form factor in this region is larger than previously assumed and is consistent with a monopole parametrization fitted to very low Q2 elastic data.

Journal Article↗
PubMed2001

Equity in access to exercise tolerance testing, coronary angiography, and coronary artery bypass grafting by age, sex and clinical indications.

OBJECTIVES: To assess whether patients with heart disease in a single UK hospital have equitable access to exercise testing, coronary angiography, and coronary artery bypass graft surgery (CABG). METHOD: Retrospective analysis of patients' medical case notes (n = 1790), tracking each case back 12 months and forward 12 months from the patient's date of entry to the study. SETTING: Single UK district hospital in the Thames Region. PATIENTS: Patients (elective and emergency) with a cardiac ICD inpatient code at discharge or death, or who were referred to cardiology or care of the elderly unit over a 12 month period in 1996-7 (new episodes) were included. RESULTS: Analysis of 1790 hospital case notes revealed that, despite having indications for intervention identical to those of younger patients, older patients (that is, those aged > 75 years) and women, independently, were significantly less likely to undergo exercise tolerance testing (exercise ECG) and cardiac catheterisation. The similar trends for age and access to CABG did not achieve significance. While clinical priority scores also independently predicted access to cardiac catheterisation and CABG, considerable numbers of patients in high clinical priority groups were not referred for either procedure. CONCLUSIONS: The management and treatment of older patients and women with cardiac disease may be different from that of younger patients and men. Given the similarity of the indications for treatment and the lack of significant contraindications or comorbidities as a cause for these differences, one possible explanation is that these patients are being discriminated against principally because of their age and sex. Although clinical priority scores independently predicted access to catheterisation and CABG, large proportions of patients in high priority groups were not referred. This implies that the New Zealand priority scoring system may be more equitable than UK practice. The cost implications of redressing these inequities in service provision would be considerable.

Age Factors↗
PubMed1999

The legal framework for informed consent.

Touching a patient without consent can leave the nurse open to action for battery. Consent must be informed and not given under duress. Consent can be written, verbal or implied. Patients should be advised if the risk of complications is other than minimal.

Forecasting↗
PubMed1998

Addressing the needs of underserved populations: one organization's experience.

Dental decay is the most prevalent and preventable chronic disease of childhood. Underserved populations are at a health disadvantage with greater unmet needs. This article will discuss the components of oral health promotion programs and facilities designed to meet the needs of underserved populations. These components include organization, needs assessment, resource assessment, priority-setting and planning, oral health intervention, and monitoring and evaluation. Examples from the experience of the San Diego Children's Dental Health Association will be presented in the discussion of each component.

California↗
PubMed1997

Phosphatidylcholine coated chest drains: are they better than conventional drains after open heart surgery?

INTRODUCTION: Inadequate thoracic drainage after open heart surgery has serious deleterious consequences. Thrombus formation within the chest drains is primarily responsible for the occlusion of chest drains. Chest drains coated with derivatives of phosphatidylcholine (PC), commonest phospholipid on cell membranes, potentially have a less thrombogenic surface. MATERIALS AND METHODS: In a prospective randomised double blind study, we compared PC-coated drains (Group I, n = 25) with non coated drains (Group II, n = 26) after open heart surgery. Drain performance, post-operative complications and clinical course were compared. RESULTS: PC-coated drains had a significantly shorter period of drainage, 20.4 +/- 1.0 versus 28.9 +/- 3.7 h (P < 0.05). Otherwise, mean volume drained, number clots removed from drain and the ease of drainage of the two types of drains were similar. There were no significant differences in the incidence of post-operative pericardial effusions, dysrhythmias, ambulation time and hospital stay. CONCLUSIONS: We conclude that the PC coated drains may be of importance in cases where prolonged drainage is anticipated otherwise they have no significant advantage.

Adult↗
PubMed1996

Myocardial dysfunction after successful resuscitation from cardiac arrest.

OBJECTIVE: To investigate the functional and metabolic changes in the myocardium after successful resuscitation from cardiac arrest. DESIGN: Prospective, randomized, sham-controlled study. SETTING: Animal laboratory at a university center. SUBJECTS: Domestic pigs. INTERVENTIONS: Electric induction of ventricular fibrillation by alternating current delivered to the right ventricular endocardium through a pacing electrode. Electric defibrillation was attempted after an interval of 12 mins of ventricular fibrillation, which included 4 mins of untreated ventricular fibrillation and 8 mins of precordial compression in 13 animals, seven of which were successfully resuscitated. Seven additional animals were randomized to serve as "sham" controls, in which cardiac arrest was not induced. MEASUREMENTS AND MAIN RESULTS: Left ventricular pressure-volume relationships utilizing the conductance method were obtained in conjunction with conventional hemodynamic and metabolic measurements at baseline and during a 6-hr interval after successful cardiac resuscitation. Progressive and striking increases in left ventricular volumes were observed after successful cardiac resuscitation. The end-diastolic volume increased from a prearrest level of 89 +/- 21 mL to a maximum of 154 +/- 53 mL (p<.05) at 360 mins after successful resuscitation. The time-coincident end-systolic volume increased from 54 +/- 21 to 126 +/- 54 mL (p<.05), such that the ejection fraction was reduced from 0.41 +/- 0.10 to 0.20 +/- 0.07 ( p<.05). Ventricular dilation was associated with marked reductions in stroke volume and ventricular work. However, compensatory increases in heart rate maintained cardiac output at levels that sustained adequate systemic oxygen delivery. The slope of the end-systolic pressure-volume relationships progressively decreased from 5.04 +/- 1.88 to 2.00 +/- 0.57 mm Hg/mL (p<.05) at 360 mins after successful resuscitation. The volume intercept at left ventricular pressure of 100 mm Hg increased from 43 +/- 19 to 94 +/- 51 mL (p=.03). Both the decrease in the slope and the increase in the volume intercept were characteristic of progressive impairment in contractile function. The rate of left ventricular pressure decrease was unchanged. Accordingly, no substantial changes in lusitropic properties were identified. Despite large increases in end-diastolic volume, the end-diastolic pressure remained unchanged. CONCLUSION: Postresuscitation myocardial dysfunction in this animal model was characterized by impaired contractile function, decreased work capability, and ventricular dilation.

Animals↗
PubMed1995

Assessment of alcohol and other drug disorders in the seriously mentally ill.

Brief assessment methods are needed to determine the presence of alcohol and drug problems in persons with severe mental illness. The purposes of this study were to determine the prevalence of alcohol and other drug problems in a rural population of 253 clients with severe mental illness and to determine the accuracy of case manager responses to specific alcohol and drug assessment questions about their clients. Clients were assessed for the presence of past and present alcohol and drug disorders by means of a face-to-face diagnostic interview. The specific questions the case managers were asked to complete were designed to assess the quantity and frequency of recent alcohol and drug use and the presence of three criteria for alcohol or drug dependence and to differentiate present versus past history of substance problems. On the basis of the Diagnostic Interview Schedule- Revised, 35 percent of the clients met current DSM-III-R alcohol or drug criteria for abuse, dependence, or both. There were differences between client and case manager reports on the clients' use of alcohol, marijuana, cocaine, narcotics, and unprescribed tranquilizers in the last year. The best predictor of a client's present alcohol or drug problem was whether the case manager thought that the client had substance use problems at some time in his or her life (sensitivity = 0.86, specificity = 0.75). This report provides additional evidence that case manager reports are a valid method of determining the prevalence of substance use problems in persons with severe mental illness.

Adult↗
PubMed1995

Mechanisms of myocardial hypercarbic acidosis during cardiac arrest.

During the global myocardial ischemia of cardiac arrest and during regional myocardial ischemia due to local impairment of coronary blood flow, intramyocardial carbon dioxide tensions (Pmco2) of ischemic myocardium increase to levels exceeding 400 Torr. The mechanism of such myocardial hypercarbic acidosis is as yet incompletely understood, specifically whether these increases in Pmco2 are due to increased oxidative metabolism, decreased CO2 removal, or buffering of metabolic acids. We therefore measured Pmco2 and the total CO2 content of rat hearts harvested before, during, and after resuscitation from cardiac arrest. Pmco2 significantly increased from an average of 63 to 209 Torr during a 4-min interval of untreated ventricular fibrillation. This was associated with concurrent decreases in intracellular pH from an average of 7.03 to 6.02 units. The total CO2 content of the myocardium simultaneously decreased from 17.0 to 16.5 mmol/kg. Accordingly, increases in Pmco2 and [H+] were observed in the absence of increases in the total CO2 content and therefore the calculated myocardial bicarbonate. These observations in the rat model implicate buffering of metabolic acids by bicarbonate rather than increases in CO2 production or decreases in CO2 removal as the predominant mechanism accounting for myocardial hypercarbia.

Acidosis↗
PubMed1993

Glycogen branching enzyme deficiency in adult polyglucosan body disease.

Branching enzyme activity was assayed in muscle, peripheral nerve, and leukocytes from 2 Ashkenazi-Jewish patients with adult polyglucosan body disease and 1 African-American and 3 Caucasian patients with the same clinical and pathological features. Branching enzyme activity was normal in the muscle specimens from both Jewish and non-Jewish patients. However, the activity was markedly decreased not only in the leukocytes from the 2 Jewish patients (confirming previous findings), but also in peripheral nerve specimens, whereas it was normal in nerve tissue and leukocytes from all non-Jewish patients. These data confirm a branching enzyme deficiency in a subgroup of patients with adult polyglucosan body disease, and show that the defect is tissue-specific, suggesting that adult polyglucosan body disease has more than one biochemical basis.

1,4-alpha-Glucan Branching Enzyme↗
PubMed1993

Staffing patterns in rural community support programs.

OBJECTIVE AND METHODS: Rural mental health programs are thought to have difficulty recruiting and retaining qualified staff and to have excessively large caseloads per staff member. The authors surveyed 12 community support programs in small cities and rural areas of Wisconsin to determine staff size and characteristics, staff-to-client ratios, and the relative use of paraprofessional staff and professional staff, excluding psychiatrists. RESULTS: The programs surveyed had an average of 5.6 full-time-equivalent caregiving staff and an average caregiver-to-client ratio of 1 to 13. Caregiving staff were predominantly female, had been in the mental health field a mean of 8.8 years, and received an average salary of $20,732. Although program directors indicated that about one-fifth of staff left in the previous year, they reported little difficulty recruiting staff. Thirty-eight percent of all caregivers were paraprofessionals; in several programs, more than half the caregivers were paraprofessionals. Use of paraprofessionals is more common in rural programs; thus caregivers in those programs are likely to have lower levels of salary and experience. CONCLUSIONS: The community support programs in the sample employed experienced caregivers and had staff-to-client ratios that were close to the ratio recommended for such programs by Wisconsin legislation. The survey findings suggest that claims of acute staffing problems in rural community support programs need to be examined more closely, with attention to the relationship between staff characteristics and client outcomes.

Adult↗
PubMed1992

Validity of case manager reports of clients' functioning in the community: independent living, income, employment, family contact, and problem behaviors.

Validity of case manager reports of client functioning in the community was assessed by examining the correspondence between case manager reports and client reports of several widely-used indicators of client well-being, including independent living, income, employment, family contact, and problem behaviors. Effects of how well case managers knew their clients and of using telephone interviews vs. self-administered questionnaires to gather case manager data were also investigated. Data were gathered from 6 case managers and 55 of their seriously mentally ill clients in a rural Wisconsin Community Support Program. Indicators of independent living and employment displayed reasonably good agreement and support the use of case manager reports in research. Indicators of income and problem behaviors produced lower levels of client-case manager agreement at least in part because client reports proved an inadequate criterion for these measures.

Activities of Daily Living↗
PubMed1990

Comparing a Christian physicians' support group with the Balint Group.

The influence of religious beliefs on physicians' social attitudes and medical practices is not as yet adequately discussed in the literature. This paper describes a Christian physician support group and contrast it with the more traditional Balint model support group. Issues of membership, leadership, and use of the group are discussed. The potential use and misuse of religiously oriented support groups are outlined. Thirteen Christian physician members of a study group were given questionnaires regarding participation in and expectations of the group. They were asked to comment on the extent to which their religious convictions influenced their practice of medicine. Participants discussed a wide range of issues both personal and professional. They benefited from the opportunity to share views with others who brought a spiritual perspective to patient care. Members stated that their spiritual beliefs influenced their attitudes toward social issues, such as abortion and divorce, and their practice of medicine, for example, by praying with and for their patients. The group provided a safe place to explore these beliefs.

Adult↗