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Biomedical subjects

P Carlson

Publications and source records attributed to P Carlson.

At least 37 records · Page 2Linked to original sources
PubMed2000

Coping and stress in Canadian family caregivers of persons with traumatic brain injuries.

The purpose of this study was to document the stresses reported by Canadian caregivers of persons with brain injuries and to consider the factors which serve to mediate or moderate such stress. Highest stress scores on the Holroyd Questionnaire on Resources and Stress-Short Form (QRS) were associated with Lifespan Care and Personal Burden. Although overall burden as reported on the QRS by parents and spouses did not differ from other studies, it did differ somewhat for specific types of burden. Social Support and Spiritual Support, as measured by the F-COPES, fell within the medium use category, and scores for Reframing, Mobilizing and Passive Appraisal fell within the high use category. In multiple regression analyses, client competency as measured by the Patient Competency Rating Scale emerged as a major predictor of stress associated with Cognitive Impairment, Physical Limitations, Lifespan Care, Terminal Illness Stress, Limits on Family Opportunities, and Personal Burden. In contrast, other client characteristics (e.g. Time Since Injury) accounted for relatively little variance. The results also indicate that both Refraining and Seeking Spiritual Support as coping strategies can make an important contribution to stress reduction.

Activities of Daily Living↗
PubMed2000

Heterogeneity of Actinobacillus actinomycetemcomitans strains in various human infections and relationships between serotype, genotype, and antimicrobial susceptibility.

Actinobacillus actinomycetemcomitans, an oral pathogen, only occasionally causes nonoral infections. In this study 52 A. actinomycetemcomitans strains from 51 subjects with nonoral infections were serotyped and genotyped by arbitrarily primed PCR (AP-PCR) to determine whether a certain clone(s) is specifically associated with nonoral infections or particular in vitro antimicrobial susceptibility patterns. The promoter structure of leukotoxin genes was additionally investigated to find the deletion characteristic of highly leukotoxic A. actinomycetemcomitans strains. The nonoral A. actinomycetemcomitans strains included all five known serotypes and nonserotypeable strains, the most common serotypes being b (40%) and c (31%). AP-PCR distinguished 10 different genotypes. A. actinomycetemcomitans serotype b strains were more frequently found in blood samples of patients with bacteremia or endocarditis than in patients with focal infections. One AP-PCR genotype was significantly more frequently found among strains originating in focal infections than in blood samples. Resistance to benzylpenicillin was significantly more frequent among A. actinomycetemcomitans serotype b strains than among strains of other serotypes. No differences in the leukotoxin gene promoter region or benzylpenicillin resistance between nonoral and oral A. actinomycetemcomitans strains were observed. Nonoral A. actinomycetemcomitans strains showed great similarity to the oral strains, confirming that the oral cavity is the likely source of nonoral A. actinomycetemcomitans infections. The predominance of serotype b strains in endocarditis and bacteremia supports the hypothesis of a relationship between certain A. actinomycetemcomitans clones and some nonoral infections. The mechanisms behind the exceptionally high rate of occurrence of benzylpenicillin resistance among A. actinomycetemcomitans serotype b strains are to be elucidated in further studies.

Actinobacillus Infections↗
PubMed2000

Evaluation of the Oricult-N dipslide for laboratory diagnosis of vaginal candidiasis.

The Oricult-N semiquantitative dipslide (Orion Diagnostica, Espoo, Finland) was evaluated for the laboratory diagnosis of vaginal candidiasis. It was compared with broth culture (Vagicult; Orion Diagnostica). Oricult-N was positive for 14.5% of 124 symptomatic patients and 12% of 50 asymptomatic controls. The results for broth cultures were 17 and 22%, respectively. Thus, the test group and the control group did not differ significantly by either method. High vaginal yeast counts (>/=10(5) CFU/ml) were detected by Oricult-N in 7% of patients and in 0% of controls, but both groups harbored low numbers of yeasts. An accurate quantitative cutoff point separating a level of yeast associated with infection from vaginal yeast carriage could not be defined in the study. Nevertheless, the easy semiquantitation allowed by the Oricult-N method could be helpful because, especially in low-count carriers of Candida, other potential causes of vaginal symptoms should be considered. The Oricult-N method was technically simple and could be applied in primary health care. Further studies are required, however, before Oricult-N can be recommended as a routine diagnostic tool.

Adult↗
PubMed2000

Stimulation of adenoidal lymphocytes by Alloiococcus otitidis.

Otitis media with effusion (OME) is characterized by persistent effusion in the middle ear cavity and by chronic inflammation in the middle ear mucosa. Alloiococcus otitidis, a gram-positive aerobic bacterium, has been isolated in middle ear effusion, and by means of sensitive polymerase chain reaction detection assays it has been detected in as many as 20% of middle ear aspirates of patients with OME. Because A otitidis may freely interact with leukocytes in the middle ear effusion, it may potentially modulate the inflammatory reaction in OME. To study the nature of these interactions, we applied an in vitro assay in which killed A otitidis bacteria were incubated with peripheral blood and adenoidal mononuclear cells. The expression of the proliferation-associated surface marker CD69 was then measured in B lymphocytes and in CD4+ helper and CD8+ cytotoxic-suppressor T lymphocytes by means of multicolor flow cytometry. Alloiococcus otitidis induced the expression of CD69 in both peripheral blood and adenoidal T and B cells. Among the T cells, the cytotoxic-suppressor T lymphocytes were preferentially activated. It was also tested whether A otitidis would have an effect in another cytotoxic and immunoregulatory system, namely, the induction of natural killer cell activity in peripheral blood mononuclear cells. However, the effect was minimal compared with that of Salmonella minnesota or Staphylococcus aureus. The results show that A otitidis has a unique immunostimulatory capacity in vitro that is mainly confined to CD8+ T lymphocytes.

Adenoids↗
PubMed1999

Antimicrobial susceptibilities and biotypes of Arcanobacterium haemolyticum blood isolates.

Isolates obtained from the blood of ten patients with Arcanobacterium haemolyticum septicaemia were biotyped as smooth or rough using morphological and biochemical criteria, and their susceptibilities to 18 antibacterial agents were determined. Nine of the clinical cases included here have not been reported previously and are discussed in brief. One of the strains was highly resistant to macrolides and clindamycin. With one exception, the strains belonged to the smooth biotype. The data presented here indicates that the treatment of systemic Arcanobacterium haemolyticum infections should be based on the antibacterial susceptibility profiles of individual strains and on the site of the infection.

Adolescent↗
PubMed1999

Transitions to independent living after ABI.

One of the most challenging questions facing service providers and policy makers alike is the appropriate level of supervision for adults living in the community following a brain injury. In a 3-year province-wide study of people entering the community following brain injury rehabilitation, four individuals (out of 22 studied) made a transition from fully supervised living to lower levels of formal supervision during their first year in the community. The present study seeks to provide more information about these four individuals, the factors that allowed them to move to lower levels of supervision, and the perceived success of that transition. For each participant, the interviews conducted over the 1 year period in the initial study were reviewed in detail for information about independent living. In addition, each participant was interviewed again for this study, along with his significant other and three of the community programme staff who were most closely involved with his transition. To summarize, factors most salient in the success of transition included: (1) Roles and relationships of family and programme personnel; (2) staying away from drugs and alcohol; (3) availability of structured daily activities, including productive activity or community programme; (4) financial management; and (5) emotion and behaviour self-control. Secondary themes related to successful community living also included the availability of transportation and prior experience with community living since the onset of brain injury. These results offer the experience of four individuals in moving towards independent living. As such, they provide a starting point for further discussions of the process of supporting individuals to pursue the ultimate goal of independent living.

Accidents, Traffic↗
PubMed1999

Life-threatening Mycoplasma hominis mediastinitis.

Mycoplasma hominis infections are easily missed because conventional methods for bacterial detection may fail. Here, 8 cases of septic mediastinitis due to M. hominis are reported and reviewed in the context of previously reported cases of mediastinitis, sternum wound infection, pleuritis, or pericarditis caused by M. hominis. All 8 patients had a predisposing initial condition related to poor cardiorespiratory function, aspiration, or complications related to coronary artery surgery or other thoracic surgeries. Mediastinitis was associated with purulent pleural effusion and acute septic symptoms requiring inotropic medication and ventilatory support. Later, the patients had a tendency for indolent chronic courses with pleuritis, pericarditis, or open sternal wounds that lasted for several months. M. hominis infections may also present as mild sternum wound infection or as chronic local pericarditis or pleuritis without septic mediastinitis. Treatment includes surgical drainage and debridement. Antibiotics effective against M. hominis should be considered when treating mediastinitis of unknown etiology.

Adult↗
PubMed1999

Beta3 integrin--a promiscuous integrin involved in vascular pathology.

OBJECTIVE: To determine whether beta3 integrin is present in blood vessels involved by atherosclerosis, Mönckeberg's medial calcinosis, vein graft atherosclerosis, transplant graft vascular disease and arterial restenosis. DESIGN: Retrospective histological and immunohistochemistry examination of tissues obtained from autopsy and surgery. SETTING: Tertiary care hospital. PATIENTS: The patients had surgical excisions of limbs, grafts, veins and arteries for the treatment of ischemic heart disease and peripheral vascular disease. Other tissues were derived from autopsies of the same patient populations. MAIN RESULTS: Beta3 integrin was found in the blood vessels involved in all of the vascular diseases examined. The location of the integrin varied among the diseases. Osteopontin, a bone sialoprotein involved in atherosclerosis and vascular repair, was also commonly detected. CONCLUSIONS: Beta3 integrin expression noted in the present study confirms the presence of this integrin in arteries with restenosis and atherosclerosis, which expands its involvement to the processes of transplant graft vascular disease, peripheral vascular disease and vein graft disease. The integrin may influence cell migration and adhesion by its interaction with noncollagenous matrix proteins, including osteopontin.

Arteriosclerosis↗
PubMed1998

Self-perceived health in East and West Europe: another European health divide.

There is a great, and possibly also a growing, difference in public health between the central, eastern (CEE) and western European countries. Several suggestions have been put forward as explanations for this health divide. A broader framework than one focusing on medical care systems or behavioural patterns is necessary to examine this difference. It will be more fruitful to try to identify social and economic factors at large, as well as specific explanatory factors. The aim of this study is to find out to what extent "The East-West Mortality Divide" was apparent in people's perception of their own health in 1990-1991, as a division in self-perceived health across Europe. If there were indeed differences, the aim is to examine whether or not they can be explained by specific economic and social conditions present in the early 1990s. Data from "World Values Survey 1990" reveal a striking east west divide in self-perceived health among people in the age group 35-64 yr, one of greater size than the gender gap in self-perceived health. The importance of a number of circumstances for people's self-perceived health in the 25 European countries was estimated. The assumption was that any resulting difference between eastern and western European countries could help to explain the health divide. An attempt was made to estimate how much the east-west health divide would be reduced if some of these circumstances were similar in CEE to those in the west. The results indicate that people's participation in civic activities has a positive effect on their health. This effect is recognised especially on a societal level. This supports theories about civic activities and community performance. In western Europe the tradition of the active citizen is more developed than in eastern Europe. People's life control was important for their self-perceived health in almost every European country, both in the west and the east. In the former communist countries, however, people did not feel that they had the same control over their lives as did people in the west. People's economic satisfaction was the most powerful predictor of self-perceived health, both in the eastern and western parts of Europe. The average level of economic satisfaction in 1990 1991 was considerably lower in CEE. If people's influence and economic resources were the same in the former communist countries as in the west, the health divide, according to my estimations, would decrease by something between 10-30%.

Adult↗
PubMed1998

Pharyngolaryngitis caused by Neisseria meningitidis.

Neisseria meningitidis is a causative agent of life-threatening cases of meningitis and sepsis, but it can also cause mild and self-limiting bacteraemia. Patients with N. meningitidis sepsis or meningitis often describe signs of upper respiratory tract infection before the onset of invasive disease. Viral respiratory infections have been associated with invasive meningococcal diseases and they may contribute to these prodromal symptoms. N. meningitidis can be cultivated from the throats of asymptomatic carriers and it likely enters the circulation through the upper respiratory tract. However, it is unclear whether N. meningitidis can cause simple pharyngitis. Here we describe a case of acute fulminant pharyngolaryngitis caused by N. meningitidis as verified by positive blood cultures.

Aged↗
PubMed1998

A transitional living environment for persons with brain injuries: staff and client perceptions.

Given increasing interest in social ecology and the impact of environmental factors upon rehabilitation outcomes, the purpose of this study was to begin to document the characteristics of a particular environment designed to meet the needs of persons with traumatic brain injuries. Staff and clients at the Transitional Living Centre of Kingston, Ontario (TLC), a community based post-acute rehabilitation programme providing both residential and day programmes for adults who have acquired brain injuries participated in this study by completing the Community-Oriented Programme Environment Scale (COPES). While COPES subscale scores for clients and staff were within the average range, the results of a multivariate analysis of variance indicated that client and staff perceptions of the TLC environment differed significantly on two subscales within the Personal Development Dimension (i.e., Personal Problem Orientation, Anger and Aggression) and on one subscale under the System Maintenance Dimension (i.e., Staff Control). The results of this study suggest that future research should consider the impact of staff and client perceptions on the effectiveness of the therapeutic environment of brain injury programmes.

Activities of Daily Living↗
PubMed1998

The definition of community integration: perspectives of people with brain injuries.

Despite considerable attention to community integration and related topics in the past decades, a clear definition of community integration continues to elude researchers and service providers. Common to most discussions of the topic, however, are three ideas: that integration involves relationships with others, independence in one's living situation and activities to fill one's time. The present study sought to expand this conceptualization of community integration by asking people with brain injuries for their own perspectives on community integration. This qualitative study resulted in a definition of community integration consisting of nine indicators: orientation, acceptance, conformity, close and diffuse relationships, living situation, independence, productivity and leisure. These indicators were empirically derived from the text of 116 interviews with people with moderate-severe brain injuries living in the community. Eighteen adults living in supported living programmes were followed for 1 year, to track their evolving definition of integration and the factors they felt were related to integration. The study also showed a general trend toward more positive evaluation over the year, and revealed that positive evaluation was frequently related to meeting new people and freedom from staff supervision. These findings are interpreted in the light of recommendations for community programmes.

Activities of Daily Living↗
PubMed1997

Induction of apoptosis and inhibition of small cell lung cancer growth by the quinoxaline tyrphostins.

Coexpression of the Kit receptor tyrosine kinase and its ligand, stem cell factor (SCF), occurs in a high proportion of small cell lung cancers (SCLCs) and drives an autocrine loop that enhances proliferation. To determine whether this autocrine loop affects apoptosis, SCLC cells expressing only SCF or both SCF and Kit were deprived of growth factors for 72 h and the relative number of cells undergoing apoptosis was assessed using nuclear DNA content and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling assays. Coexpression of SCF and Kit inhibited apoptosis; apoptosis could, in turn, be enhanced by the addition of the quinoxaline tyrosine kinase inhibitors, which are specific antagonists of the platelet-derived growth factor receptor and Kit. Treatment of the H526 cell line, which is growth-stimulated by soluble SCF, with AG1296 resulted in a marked decrease in growth and an increase in apoptosis in a dose-dependent fashion. Growth inhibition correlated well with the inhibition of Kit tyrosine phosphorylation. The AG1296 compound at its maximum soluble concentration inhibited the growth of 5 of 6 SCLC cell lines in complete medium by an average of 50%. These data suggest that optimized pharmacological inhibitors of Kit activity may be a new class of compounds potentially useful in the treatment of SCLC.

Apoptosis↗
PubMed1996

Case report: immunoglobulin M-mediated, temperature-dependent neutrophil agglutination as a cause of pseudoneutropenia.

The authors report the case of a 77-year-old man in whom intermittent neutropenia developed during a prolonged hospitalization. Laboratory records revealed wide variations in the patient's routine leukocyte counts. Examination of the peripheral smear revealed clumps of 2-3 polymorphonuclear leukocytes throughout the slide and large aggregates (> 50 cells) along the smear edges. Neutrophil clumping also was observed in blood anticoagulated with citrate or heparin. Replacement of patient plasma with saline prevented agglutination. Addition of patient plasma or serum to normal cells induced neutrophil agglutination. Holding the patients blood at 37 degrees C prevented agglutination, which occurred spontaneously and more exuberantly as the temperature was reduced to 22 degrees C. Flow cytometry revealed immunoglobulin M on neutrophil surfaces. Spontaneous agglutination resolved 6 months after resection of the patient's subsequently diagnosed colon cancer. This is the first report of immunoglobulin M-induced neutrophil clumping occurring in the setting of malignancy, and the first reported immunoglobulin M not to require ethylenediaminetetraacetic acid as a cofactor for agglutination.

Adult↗
PubMed1995

Capnocytophaga canimorsus septicemia: fifth report of a cat-associated infection and five other cases.

Capnocytophaga canimorsus is a fastidious, slow-growing, gram-negative, rod-shaped bacterium that belongs to the normal oral flora of dogs and cats. Human septicemic infections are associated with a high mortality; most cases occur in immunocompromised patients with a history of dog bite. The fifth case of cat-associated septicemia caused by Capnocytophaga canimorsus is described. The six case reports presented here point out the characteristics reported previously: (a) cats are a source of human infection; (b) alcohol abuse is an important risk factor for the development of septicemic Capnocytophaga canimorsus infection; (c) septicemic infection often manifests with disseminated intravascular consumption coagulopathy or purpura; and (d) some cases of septicemia in humans result from pets that lick skin ulcers.

Adult↗
PubMed1995

Additional tests to differentiate Arcanobacterium haemolyticum and Actinomyces pyogenes.

A commercially available biochemical test panel, commercially available diagnostic tablets and gas-liquid chromatography (GLC) of cellular fatty acids were used to find out whether Arcanobacterium haemolyticum and Actinomyces pyogenes could be further differentiated from each other. Xylitol and alpha-methyl-D-glucoside fermentation, Voges-Proskauer reaction and tributyrate hydrolysis were found to be useful additional tests which differentiated Arc. haemolyticum and A. pyogenes. GLC analysis revealed major differences in the cellular 16:0, 18:2(9,12) and 18:1(9) fatty acid composition of the two species. Especially the Voges-Proskauer test available as diagnostic tablets can be easily performed in clinical microbiology laboratories, in addition to the tests now used to differentiate Arc. haemolyticum from A. pyogenes.

Acetoin↗