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Biomedical subjects

D J Stott

Publications and source records attributed to D J Stott.

At least 19 recordsLinked to original sources
PubMed2006

Elevated troponin levels are associated with sympathoadrenal activation in acute ischaemic stroke.

BACKGROUND: It has been hypothesised that elevated serum troponin levels in acute stroke are due to myocardial damage caused by sympathoadrenal activation, which, in turn, may be due particularly to insular damage. We aimed to determine the factors associated with troponin elevation in ischaemic stroke and the prognostic value of this finding. METHODS: We studied 222 consecutive acute ischaemic stroke admissions. Serum troponin I and catecholamines were measured. Ischaemic damage on brain computed tomography (CT) scan was graded using the Alberta Stroke Program Early CT Score (ASPECTS). Electrocardiograms were classified using the Minnesota Code and the European Society of Cardiology/American College of Cardiology criteria for acute myocardial infarction. The Rankin scale was recorded at 30 days. RESULTS: Forty-five patients (20%) had troponin I >0.2 microg/l. These troponin-positive patients had higher epinephrine levels (median 0.27 vs. 0.17 nmol/l; p = 0.0002) and were more likely to have electrocardiograms coded as definite or possible acute myocardial infarction (odds ratio 3.35; 95% CI 1.26-8.93), compared with those with troponin < or = 0.2 microg/l, in univariate analysis. There were no significant associations between troponin I score and ASPECTS or insular damage on brain CT. In logistic regression analyses, elevated troponin was significantly associated with age, elevated serum creatinine and epinephrine; however, increased troponin was not an independent predictor of death or dependency (Rankin >2) at 30 days. CONCLUSIONS: Raised troponin I is associated with elevation of circulating epinephrine in acute ischaemic stroke. Activation of the sympathoadrenal system may be an important contributor to myocardial damage in these patients. Increased troponin is not associated with insular damage and does not independently predict poor outcome.

Acute Disease↗
PubMed2005

Monitoring patients on methotrexate: hepatic fibrosis not seen in patients with normal serum assays of aminoterminal peptide of type III procollagen.

BACKGROUND: The aminoterminal peptide of type III procollagen (PIIINP) is formed during the synthesis of type III collagen and can be measured in the serum. It has been used as a marker for hepatic fibrosis in patients on long-term methotrexate and it has been suggested that serial assay of PIIINP could reduce or eliminate the need for liver biopsies in these patients. OBJECTIVES: To determine whether routine use of the PIIINP assay in a cohort of patients on methotrexate would reliably identify those who were developing hepatic fibrosis and exclude those who were not, thereby reducing or eliminating the need for liver biopsies in this latter group. METHODS: Data were available from a clinical series of 38 patients on methotrexate, who had undergone a total of 70 liver biopsies and 306 PIIINP assays. Liver biopsies were graded using the Roenigk classification. RESULTS: In 34 patients, the findings on 46 liver biopsies could be compared with the results of contemporaneous PIIINP assays. Apart from two biopsies from two patients where fibrosis was no longer detected on a subsequent biopsy, all four biopsies showing fibrosis had abnormal results on over half of the associated PIIINP assays. There were no biopsies showing fibrosis where all associated PIIINP assays were normal. However, 50% of biopsies without fibrosis had at least one abnormal associated assay. In 23 patients, the results of serial PIIINP assays performed between two sequential liver biopsies were correlated with changes in the biopsy in terms of fibrosis. Data were available for 32 pairs of liver biopsies. Apart from a biopsy pair in one patient where fibrosis on the second biopsy was not detected on a third biopsy, all four biopsy pairs defined as showing deterioration had abnormal results on over half of the intervening PIIINP assays. There were no biopsy pairs showing deterioration where all intervening assay results were normal. However, 63% of stable biopsy pairs had at least one abnormal intervening assay. Two patients with nonalcoholic steatohepatitis, which manifests a pattern of fibrosis not scored under the Roenigk classification, had persistently and substantially elevated PIIINP levels. CONCLUSIONS: The data presented support the view that follow-up liver biopsies, as recommended by published guidelines, for patients on long-term low-dose methotrexate can be avoided if PIIINP levels are consistently normal. This approach would have reduced the number of patients requiring biopsy in our series by 45%. The PIIINP assay will also be helpful in the management of patients on methotrexate in whom liver biopsy is contraindicated, and in patients with nonalcoholic steatohepatitis.

Adult↗
PubMed2004

Dementia in subjects with atrial fibrillation: hemostatic function and the role of anticoagulation.

BACKGROUND: Atrial fibrillation (AF) is associated with cognitive impairment and dementia, perhaps through encouraging a prothrombotic state and cardioembolism. OBJECTIVES: We wished to test the hypotheses that hemostatic function is altered in subjects with AF who develop dementia, and that long-term warfarin anticoagulation is protective against this complication. PATIENTS AND METHODS: Recruitment was from an observational cohort study of AF. Baseline assessment included measurement of plasma fibrinogen, fibrin D-dimer, prothrombin fragment 1+2 (F1+2), thrombin-antithrombin complexes (TAT), von Willebrand factor and tissue plasminogen activator. We assessed cognitive function after 3 years' follow-up using the 13-item modified Telephone Interview for Cognitive Status (TICSm) and the short form of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE). RESULTS: Of the 218 subjects assessed, 145 (66%) were prescribed warfarin. Forty-nine (22%) met TICSm/IQCODE criteria for dementia. D-dimer, F1+2 and TAT levels were higher in AF subjects with dementia compared with those without (medians 81 vs. 60 ng mL(-1), P = 0.008; 0.76 vs. 0.49 nmol L(-1), P = 0.006; and 1.78 vs. 1.44 microg L(-1), P = 0.003, respectively). These associations became of borderline statistical significance following adjustment for age. Logistic regression showed a trend towards warfarin use being independently associated with reduced prevalence of dementia (odds ratio 0.52, P = 0.08). CONCLUSIONS: We found evidence of increased thrombin generation and fibrin turnover in subjects with AF and dementia compared with those without dementia. Long-term warfarin use may be protective against the development of dementia in subjects with AF.

Aged↗
PubMed2004

Poor outcome in primary intracerebral haemorrhage: results of a matched comparison.

BACKGROUND: Primary intracerebral haemorrhage (PICH) is associated with a poorer outcome than cerebral infarction. This study aimed to determine whether this is explained by the clinical severity of stroke. METHODS: An observational study of outcome in consecutive admissions with acute PICH and ischaemic stroke was undertaken. A nested case-control analysis, matched on a 1:2 basis for age, pre-stroke disability, early neurological impairment (Scandinavian Stroke Scale; SSS), and Oxfordshire Community Stroke Project classification was then performed. Follow up was at 30 days and at hospital discharge. RESULTS: Overall, 679 subjects were included in the analysis. Of these, 53 (8%) had PICH; this group had more severe initial neurological impairment (day 3 SSS 28 v 45 points, p<0.001) and a higher prevalence of total anterior circulation strokes (55% v 21%, p<0.001) than did the group admitted with ischaemic strokes. Outcomes were poorer in the PICH group, with 36% inpatient mortality and 68% of survivors having a day 30 modified Rankin Scale (MRS) of at least 3 (compared with 13% and 52%, respectively, in the ischaemic stroke group). Following matching for baseline clinical characteristics, the PICH group had a higher mortality, but this was not statistically significant; the day 30 MRS and institutionalisation rates in survivors were similar in the matched haemorrhage and infarct groups. CONCLUSIONS: Compared with ischaemic stroke, PICH is associated with higher mortality and increased disability in survivors. The severity of clinical stroke is a major contributor to these poor outcomes; baseline characteristics, however, do not fully explain outcome differences.

Aged↗
PubMed2003

Contractures in the post-stroke wrist: a pilot study of its time course of development and its association with upper limb recovery.

BACKGROUND: Contractures are common in a stroke population, yet there is little information on the time course of development. OBJECTIVES: Investigate quantitatively changes associated with contracture formation in an acute stroke population. STUDY DESIGN: Longitudinal study on 22 subjects who were 2-4 weeks post stroke. OUTCOME MEASURES: Contractures were assessed by quantifying the resting posture, resistance to passive movement and passive range of movement. Upper limb function was measured using the Action Research Arm Test and the Nine-Hole Peg Test. Active range of extension, wrist extension strength (isometric), grip strength and neglect were also measured. REPEATED MEASURES: Following an initial assessment, repeated measurements were taken at 4, 8, 20 and 32 weeks after recruitment. RESULTS: Two distinct subgroups, one capable of some functional movement (F group; 8 subjects) and another which was not (NF group; 14 subjects), were identified at the start of the study. The NF group showed changes associated with contracture formation at the wrist, i.e., reduction in the passive range of movement, an increase in resistance to passive movement and a worsening of the flexion posture. Changes were observed from the time of recruitment even though neglect improved. The F group showed improvements in upper limb function and there was no evidence to support contracture formation. CONCLUSIONS: Subjects most prone to contracture formation were those who showed no signs of early functional recovery (2-4 weeks after the stroke). Changes consistent with adaptive shortening were seen from week 4 of the study period.

Adult↗
PubMed2002

Nosocomial transmission of influenza.

Influenza is a common nosocomial infection. Serious outbreaks occur typically in elderly long-term patients, but have also been reported in renal, transplant and oncology units, neonatal intensive care and paediatrics. It is likely that staff-patient cross-infection is common. Prompt diagnosis of an outbreak lies at the heart of an effective influenza control programme. This requires effective virological surveillance. There are a variety of strategies that can help to prevent spread of influenza in health care settings. Basic infection control should include isolating infected residents, restricting circulation of nursing staff between patients, and restriction of visitors. Annual influenza immunization should be offered to elderly patients, subjects with chronic disease, and those in long-term residential or nursing home care. Vaccination of health care workers has been shown to be effective in protecting elderly patients in long-term care. Use of oral amantadine or rimantadine is an additional possible strategy for prophylaxis or treatment during an outbreak.

Aged↗
PubMed2002

Testing cognitive function in elderly populations: the PROSPER study. PROspective Study of Pravastatin in the Elderly at Risk.

OBJECTIVES: For large scale follow up studies with non-demented patients in which cognition is an endpoint, there is a need for short, inexpensive, sensitive, and reliable neuropsychological tests that are suitable for repeated measurements. The commonly used Mini-Mental-State-Examination fulfils only the first two requirements. METHODS: In the PROspective Study of Pravastatin in the Elderly at Risk (PROSPER), 5804 elderly subjects aged 70 to 82 years were examined using a learning test (memory), a coding test (general speed), and a short version of the Stroop test (attention). Data presented here were collected at dual baseline, before randomisation for active treatment. RESULTS: The tests proved to be reliable (with test/retest reliabilities ranging from acceptable (r=0.63) to high (r=0.88) and sensitive to detect small differences in subjects from different age categories. All tests showed significant practice effects: performance increased from the first measurement to the first follow up after two weeks. CONCLUSION: Normative data are provided that can be used for one time neuropsychological testing as well as for assessing individual and group change. Methods for analysing cognitive change are proposed.

Aged↗
PubMed2001

Systematic reviews.

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Databases, Factual↗
PubMed2001

Haemostasis in ischaemic stroke and vascular dementia.

Abnormalities of coagulation and fibrinolysis may play an important role in the pathogenesis of ischaemic stroke and vascular dementia. We aimed to determine whether haemostatic function is altered in acute recent-onset or chronic ischaemic cerebrovascular disease. We studied consecutive patients with ischaemic stroke (n = 74) and vascular dementia (n = 42) compared with healthy controls (n = 40) in a case-control study. The ischaemic stroke group was assessed twice, 3-10 days after the acute stroke and at 1-3 months. Fibrinogen, fibrin D-dimer (marker of fibrin turnover) and von Willebrand factor (vWF) (marker of endothelial disturbance) were elevated acutely (P < 0.0001) and in the convalescent phase after ischaemic stroke (P < 0.0001, P < 0.0001, and P < 0.01 respectively, compared with controls). Similar results were seen in the vascular dementia group. Stepwise multivariate regression analyses showed that cerebrovascular disease correlated independently with fibrinogen (P < 0.001) and fibrin D-dimer levels (P < 0.001), while vWF correlated independently with electrocardiograph evidence of ischaemic heart disease (P = 0.004). Changes between acute and convalescent phases in ischaemic stroke were slightly inconsistent. However, in the acute stage there were tendencies for fibrinogen, D-dimer and vWF to be increased, and factor VIII was significantly higher. Abnormalities of haemostasis, including increased fibrin turnover and endothelial disturbance, are found in both acute and chronic cerebral ischaemia. Many of these patients have co-existent ischaemic heart disease and this may contribute to some of these changes. Acute ischaemic stroke is associated with transient changes in haemostatic factors; however, most abnormalities persist into the convalescent phase, and are also demonstrable in subjects with vascular dementia.

Acute-Phase Reaction↗
PubMed2001

Randomized controlled trial of quadriceps training after proximal femoral fracture.

OBJECTIVE: To determine whether systematic progressive high-intensity quadriceps training increases leg extensor power and reduces disability in patients rehabilitating after proximal femoral fracture. DESIGN: Open parallel group randomized controlled trial comparing the addition of six weeks quadriceps training (40 patients) with standard physiotherapy alone (40 patients). The training group exercised twice weekly, with six sets of 12 repetitions of knee extension (both legs), progressing up to 80% of their one-repetition maximum. SETTING: Orthogeriatric unit, and community follow-up. SUBJECTS: Eighty patients rehabilitating after proximal femoral fracture. MAIN OUTCOME MEASURES: Measurements of leg extensor power (Nottingham Power Rig), functional mobility (elderly mobility score), disability (Barthel Index) and quality of life (Nottingham Health Profile) were made at baseline, after six weeks (at the end of the intervention) and at 16 weeks. RESULTS: Leg extensor power increased significantly in the quadriceps training group (fractured leg mean improvement at six weeks 157% (standard error 16), nonfractured leg 80% (12)) compared with the control group (63% (11) and 26% (8) respectively, unpaired Student's t-test p = 0.007 and p = 0.01 for between-group comparisons). Significant benefits were maintained at 16 weeks. Quadriceps training resulted in a greater increase in elderly mobility scale score compared with standard rehabilitation (between-group difference of 2.5 (95% CI 1.1,3.8) at week 6 and 1.9 (0.4,3.4) at week 16). Barthel score increased significantly from week 0 to 6 in the quadriceps training group compared with controls (Mann-Whitney U-test p = 0.05). Patients in the quadriceps training group scored significantly better in the energy subscore of the Nottingham Health Profile at the end of follow-up (Mann-Whitney U-test p = 0.0185). CONCLUSIONS: Progressive high-intensity quadriceps training in elderly proximal femoral fracture patients increased leg extensor power and reduced disability. This was accompanied by an increase in energy as measured by the Nottingham Health Profile. This intervention may provide a simple practical way of improving outcome in these patients.

Aged↗
PubMed2000

Effects of influenza vaccination of health-care workers on mortality of elderly people in long-term care: a randomised controlled trial.

BACKGROUND: Vaccination of health-care workers has been claimed to prevent nosocomial influenza infection of elderly patients in long-term care. Data are, however, limited on this strategy. We aimed to find out whether vaccination of health-care workers lowers mortality and the frequency of virologically proven influenza in such patients. METHODS: In a parallel-group study, health-care workers in 20 long-term elderly-care hospitals (range 44-105 patients) were randomly offered or not offered influenza vaccine (cluster randomisation, stratified for policy for vaccination of patients and hospital size). All deaths among patients were recorded over 6 months in the winter of 1996-97. We selected a random sample of 50% of patients for virological surveillance for influenza, with combined nasal and throat swabs taken every 2 weeks during the epidemic period. Swabs were tested by tissue culture and PCR for influenza viruses A and B. FINDINGS: Influenza vaccine uptake in health-care workers was 50.9% in hospitals in which they were routinely offered vaccine, compared with 4.9% in those in which they were not. The uncorrected rate of mortality in patients was 102 (13.6%) of 749 in vaccine hospitals compared with 154 (22.4%) of 688 in no-vaccine hospitals (odds ratio 0.58 [95% CI 0.40-0.84], p=0.014). The two groups did not differ for proportions of patients positive for influenza infection (5.4% and 6.7%, respectively); at necropsy, PCR was positive in none of 17 patients from vaccine hospitals and six (20%) of 30 from no-vaccine hospitals (p=0.055). INTERPRETATION: Vaccination of health-care workers was associated with a substantial decrease in mortality among patients. However, virological surveillance showed no associated decrease in non-fatal influenza infection in patients.

Aged↗
PubMed2000

Medical complications after stroke: a multicenter study.

BACKGROUND AND PURPOSE: This prospective, multicenter study was performed to determine the frequency of symptomatic complications up to 30 months after stroke using prespecified definitions of complications. METHODS: We recruited 311 consecutive stroke patients admitted to hospital. Research nurses reviewed their progress on a weekly basis until hospital discharge and again at 6, 18, and 30 months after stroke. RESULTS: Complications during hospital admission were recorded in 265 (85%) of stroke patients. Specific complications were as follows: neurological-recurrent stroke (9% of patients), epileptic seizure (3%); infections-urinary tract infection (24%), chest infection (22%), others (19%); mobility related-falls (25%), falls with serious injury (5%), pressure sores (21%); thromboembolism-deep venous thrombosis (2%), pulmonary embolism (1%); pain-shoulder pain (9%), other pain (34%); and psychological-depression (16%), anxiety (14%), emotionalism (12%), and confusion (56%). During follow-up, infections, falls, "blackouts, " pain, and symptoms of depression and anxiety remained common. Complications were observed across all 3 hospital sites, and their frequency was related to patient dependency and duration after stroke. CONCLUSIONS: Our prospective cohort study has confirmed that poststroke complications, particularly infections and falls, are common. However, we have also identified complications relating to pain and cognitive or affective symptoms that are potentially preventable and may previously have been underestimated.

Accidental Falls↗