Catalogue Search | MBRL
Search Results Heading
Explore the vast range of titles available.
MBRLSearchResults
-
DisciplineDiscipline
-
Is Peer ReviewedIs Peer Reviewed
-
Reading LevelReading Level
-
Content TypeContent Type
-
YearFrom:-To:
-
More FiltersMore FiltersItem TypeIs Full-Text AvailableSubjectPublisherSourceDonorLanguagePlace of PublicationContributorsLocation
Done
Filters
Reset
236
result(s) for
"Clayton, Tim"
Sort by:
Bonaparte and the British : prints and propaganda in the age of Napoleon
Not only was Waterloo one of the most decisive battles ever fought, it was also a crucial event in European history, ending over 20 years of conflict and bringing to his knees one of Europe's most challenging figures - Napoleon Bonaparte. This book shows through contemporary prints how Bonaparte was seen from across the English Channel where hostile propaganda was tempered by admiration for his military and administrative talents.
Quantification of risk factors for herpes zoster: population based case-control study
2014
Objectives To quantify the effects of possible risk factors for herpes zoster at different ages. Design Case-control study. Setting UK Clinical Practice Research Datalink primary care data. Participants 144 959 adults diagnosed with zoster between 2000 and 2011; 549 336 age, sex, and practice matched controls. Main outcome measures Conditional logistic regression was used to generate adjusted odds ratios to estimate the strength of association of each potential risk factor with zoster and assess effect modification by age. Results The median age of the cases and controls was 62 years. Factors associated with increased risk of zoster included rheumatoid arthritis (3111 (2.1%) v 8029 (1.5%); adjusted odds ratio 1.46, 99% confidence interval 1.38 to 1.55), inflammatory bowel disease (1851 (1.3%) v 5118 (0.9%); 1.36, 1.26 to 1.46), chronic obstructive pulmonary disease (6815 (4.7%) v 20 201 (3.7%); 1.32, 1.27 to 1.37), asthma (10 243 (7.1%) v 31 865 (5.8%); 1.21, 1.17 to 1.25), chronic kidney disease (8724 (6.0%) v 29 437 (5.4%); 1.14, 1.09 to 1.18), and depression (6830 (4.7%) v 22 052 (4.0%); 1.15, 1.10 to 1.20). Type 1, but not type 2, diabetes showed some association with zoster (adjusted odds ratio 1.27, 1.07 to 1.50). The relative effects of many assessed risk factors were larger in younger patients. Patients with severely immunosuppressive conditions were at greatest risk of zoster—for example, patients with lymphoma (adjusted odds ratio 3.90, 3.21 to 4.74) and myeloma (2.16, 1.84 to 2.53), who are not eligible for zoster vaccination. Conclusions A range of conditions were associated with increased risk of zoster. In general, the increased risk was proportionally greater in younger age groups. Current vaccines are contraindicated in people at the greatest risk of zoster, highlighting the need for alternative risk reduction strategies in these groups.
Journal Article
Batman : preludes to the wedding
\"You are cordially invited... Bruce Wayne and Selina Kyle are about to tie the knot, uniting two of Gotham's greatest vigilantes in the wedding of the century. But the city's deadliest villains are determined to crash the party, and only Batman and Catwoman's closest allies stand in their way! Robin vs. Ra's al Ghul: It's grandson versus grandfather as the son of the Bat faces the head of the Demon in a fatal family feud! Nightwing vs. Hush: Batman's original partner turned best man squares off against Bruce Wayne's oldest friend turned bitterest enemy! Batgirl vs. the Riddler: Two of Gotham City's greatest minds clash as the one-time Oracle and the overlord of Zero Year launch a war of wits! Red Hood vs. Anarky: Agents of chaos collide in a battle between the Dark Knight's rogue Robin and the underworld's most unpredictable mastermind! Harley Quinn vs. The Joker: Once upon a time, they too might have said, \"I do.\" Now the Clown Prince of Crime and the Mistress of Mayhem are at each other's throats, with all nine of Catwoman's lives hanging in the balance!\"-- Provided by publisher.
Coronary artery bypass surgery compared with percutaneous coronary interventions for multivessel disease: a collaborative analysis of individual patient data from ten randomised trials
by
Carrié, Didier
,
Lopes, Neuza
,
King, Spencer B
in
Aged
,
Angioplasty, Balloon, Coronary
,
Biological and medical sciences
2009
Coronary artery bypass graft (CABG) and percutaneous coronary intervention (PCI) are alternative treatments for multivessel coronary disease. Although the procedures have been compared in several randomised trials, their long-term effects on mortality in key clinical subgroups are uncertain. We undertook a collaborative analysis of data from randomised trials to assess whether the effects of the procedures on mortality are modified by patient characteristics.
We pooled individual patient data from ten randomised trials to compare the effectiveness of CABG with PCI according to patients' baseline clinical characteristics. We used stratified, random effects Cox proportional hazards models to test the effect on all-cause mortality of randomised treatment assignment and its interaction with clinical characteristics. All analyses were by intention to treat.
Ten participating trials provided data on 7812 patients. PCI was done with balloon angioplasty in six trials and with bare-metal stents in four trials. Over a median follow-up of 5·9 years (IQR 5·0–10·0), 575 (15%) of 3889 patients assigned to CABG died compared with 628 (16%) of 3923 patients assigned to PCI (hazard ratio [HR] 0·91, 95% CI 0·82–1·02; p=0·12). In patients with diabetes (CABG, n=615; PCI, n=618), mortality was substantially lower in the CABG group than in the PCI group (HR 0·70, 0·56–0·87); however, mortality was similar between groups in patients without diabetes (HR 0·98, 0·86–1·12; p=0·014 for interaction). Patient age modified the effect of treatment on mortality, with hazard ratios of 1·25 (0·94–1·66) in patients younger than 55 years, 0·90 (0·75–1·09) in patients aged 55–64 years, and 0·82 (0·70–0·97) in patients 65 years and older (p=0·002 for interaction). Treatment effect was not modified by the number of diseased vessels or other baseline characteristics.
Long-term mortality is similar after CABG and PCI in most patient subgroups with multivessel coronary artery disease, so choice of treatment should depend on patient preferences for other outcomes. CABG might be a better option for patients with diabetes and patients aged 65 years or older because we found mortality to be lower in these subgroups.
Agency for Healthcare Research and Quality.
Journal Article
Efficient statistical analysis of trial designs: win ratio and related approaches for composite outcomes
2025
In randomized controlled clinical trials, composite outcomes are often used to study treatment effects. This approach is popular because it increases the number of observed events, enhancing statistical power while reducing the required patient sample size. However, composite outcomes do not provide insight into the effect of individual endpoints. This becomes particularly relevant when mortality is combined with less critical but clinically relevant endpoints or when the clinical importance of individual endpoints varies significantly. As a result, interpreting composite outcomes can be challenging.
This narrative review introduces the win ratio (WR), a method for prioritizing individual endpoints within a composite outcome. The WR offers an alternative to composite outcomes by considering the clinical importance of each component and prioritizing the most critical endpoint, such as death, over less significant events.
Despite the popularity of the WR among cardiovascular trialists, this approach has not been extensively used in other areas of clinical research. We contend, that perioperative and periprocedural researchers could consider the WR and related approaches when the outcomes of interest are not of similar clinical importance. To this end, understanding the benefits and limitations of the WR will be essential to exploit its benefits, while avoiding potential misuses of the technique.
Journal Article
Impact of major bleeding and blood transfusions after cardiac surgery: Analysis from the Acute Catheterization and Urgent Intervention Triage strategY (ACUITY) trial
by
Parise, Helen
,
Pocock, Stuart J.
,
Stone, Gregg W.
in
Acute Coronary Syndrome - surgery
,
Aged
,
Biological and medical sciences
2012
Prior retrospective studies have identified a relationship between bleeding after cardiac surgery and subsequent mortality. Whether this is attributable to bleeding, anemia, or transfusions is undetermined.
ACUITY was an international prospective trial of patients with acute coronary syndromes. Coronary artery bypass grafting (CABG) before hospital discharge was performed in 1,491 patients. Major bleeding was adjudicated as CABG- or non-CABG related. The relationship between CABG-related bleeding and 1-year mortality was determined using a time-updated covariate-adjusted Cox model.
Coronary artery bypass grafting–related major bleeding after surgery occurred in 789 patients (52.9%); allogeneic blood product transfusions were administered in 612 patients (41.0%), including red blood cell (RBC) transfusions in 570 (38.2%, range 1-53 U), platelet transfusions in 180 (12.1%), and fresh-frozen plasma in 195 (13.1%). One-year mortality occurred in 95 patients (6.4%). Red blood cell transfusion (but not transfusion of platelets or fresh-frozen plasma, CABG-related major bleeding per se, or nadir hemoglobin) was an independent predictor of 1-year mortality, but only after transfusion of ≥4 U (adjusted hazard ratio for death after transfusion of 1-3, 4-6, and ≥7 RBC units = 0.74, 2.01, and 5.22, respectively). Of the 95 deaths after CABG, 23 (24.2%) were attributable to CABG-related RBC transfusions.
In patients with acute coronary syndromes, RBC transfusion of ≥4 U after CABG is strongly associated with subsequent mortality. Future strategies should focus on reducing major hemorrhagic complications and RBC transfusions after CABG.
Journal Article
Survival plots of time-to-event outcomes in clinical trials: good practice and pitfalls
by
Clayton, Tim C
,
Pocock, Stuart J
,
Altman, Douglas G
in
Biological and medical sciences
,
Clinical trial. Drug monitoring
,
Clinical trials
2002
Survival plots of time-to-event data are a key component for reporting results of many clinical trials (and cohort studies). However, mistakes and distortions often arise in the display and interpretation of survival plots. This article aims to highlight such pitfalls and provide recommendations for future practice. Findings are illustrated by topical examples and also based on a survey of recent clinical trial publications in four major journals. Specific issues are: should plots go up or down (we recommend up), how far in time to extend the plot, showing the extent of follow-up, displaying statistical uncertainty by including SEs or CIS, and exercising caution when interpreting the shape of plots and the time-pattern of treatment difference.
Journal Article
Ashwagandha (Withania somnifera (L.) Dunal) for promoting recovery in long covid: protocol for a randomised placebo-controlled clinical trial (APRIL Trial)
by
Clayton, Tim
,
Mathpathi, Mahesh
,
Dhillon, Arandeep
in
Adult
,
Chronic illnesses
,
Clinical trials
2025
BackgroundLong covid describes a syndrome of persistent symptoms following COVID-19 and is responsible for substantial healthcare and economic burden. Currently, no effective treatments have been established. Ashwagandha (Withania somnifera (L.) Dunal) is a medicinal herb traditionally used in India for its immune-strengthening and anti-inflammatory properties. Withanolides, a family of steroid-derived molecules unique to Ashwagandha, have been shown to modulate inflammatory pathways in animal models, and several small randomised trials in humans support its effectiveness for reducing symptoms that are also associated with long covid. Therefore, this study aims to assess whether Ashwagandha is effective and safe for improving functional status and reducing symptom burden in adults living with long covid.MethodsA randomised double-blind placebo-controlled trial will be performed at participating general practice (GP) surgeries and long covid clinics across the UK. Individuals diagnosed with long covid will be screened for eligibility and then randomised 1:1 to take 1000 mg daily of Ashwagandha root extract tablets (standardised to <0.9% withanolides) or matching placebo tablets for 3 months (target, n = 2500). Monthly online surveys will be performed to collect patient-reported outcomes, and monthly safety monitoring, including liver function tests, will be conducted by clinical site teams. The primary outcome of the Post-COVID Functional Status Scale score at 3 months will be assessed by baseline-adjusted ordinal logistic regression, according to a pre-published statistical analysis plan. The secondary outcomes included validated quality of life and long covid symptom scales, work status and productivity and adverse events. The trial has been approved as a Clinical Trial of an Investigational Medicinal Produce by the Medicines and Healthcare Regulatory Authority and by the NHS Research Ethics Committee and Health Research Authority.DiscussionTreatments for long covid are urgently needed. This trial will robustly evaluate the safety and efficacy of a candidate treatment with a promising efficacy and safety profile. If found to be effective, the findings will likely influence treatment guidelines and improve health outcomes in those living with long covid.Trial registration numberThis trial was pre-registered on 15/08/2022: ISRCTN12368131
Journal Article
Red Blood Cell Transfusion and Mortality in Trauma Patients: Risk-Stratified Analysis of an Observational Study
2014
Haemorrhage is a common cause of death in trauma patients. Although transfusions are extensively used in the care of bleeding trauma patients, there is uncertainty about the balance of risks and benefits and how this balance depends on the baseline risk of death. Our objective was to evaluate the association of red blood cell (RBC) transfusion with mortality according to the predicted risk of death.
A secondary analysis of the CRASH-2 trial (which originally evaluated the effect of tranexamic acid on mortality in trauma patients) was conducted. The trial included 20,127 trauma patients with significant bleeding from 274 hospitals in 40 countries. We evaluated the association of RBC transfusion with mortality in four strata of predicted risk of death: <6%, 6%-20%, 21%-50%, and >50%. For this analysis the exposure considered was RBC transfusion, and the main outcome was death from all causes at 28 days. A total of 10,227 patients (50.8%) received at least one transfusion. We found strong evidence that the association of transfusion with all-cause mortality varied according to the predicted risk of death (p-value for interaction <0.0001). Transfusion was associated with an increase in all-cause mortality among patients with <6% and 6%-20% predicted risk of death (odds ratio [OR] 5.40, 95% CI 4.08-7.13, p<0.0001, and OR 2.31, 95% CI 1.96-2.73, p<0.0001, respectively), but with a decrease in all-cause mortality in patients with >50% predicted risk of death (OR 0.59, 95% CI 0.47-0.74, p<0.0001). Transfusion was associated with an increase in fatal and non-fatal vascular events (OR 2.58, 95% CI 2.05-3.24, p<0.0001). The risk associated with RBC transfusion was significantly increased for all the predicted risk of death categories, but the relative increase was higher for those with the lowest (<6%) predicted risk of death (p-value for interaction <0.0001). As this was an observational study, the results could have been affected by different types of confounding. In addition, we could not consider haemoglobin in our analysis. In sensitivity analyses, excluding patients who died early; conducting propensity score analysis adjusting by use of platelets, fresh frozen plasma, and cryoprecipitate; and adjusting for country produced results that were similar.
The association of transfusion with all-cause mortality appears to vary according to the predicted risk of death. Transfusion may reduce mortality in patients at high risk of death but increase mortality in those at low risk. The effect of transfusion in low-risk patients should be further tested in a randomised trial.
www.ClinicalTrials.gov NCT01746953.
Journal Article
Individualizing treatment choices using quantitative methods
by
Pocock, Stuart J.
,
Stone, Gregg W.
,
Mehran, Roxana
in
Acute coronary syndromes
,
Cardiovascular
,
Clinical trials
2014
[...]the absolute treatment benefit will be markedly less in low-risk patients, which has implications for whom the new treatment is warranted. [...]Salisbury et al7 created multivariable predictive models for major ischemia risk and for bleeding risk with 13 and 12 baseline variables, respectively.
Journal Article