David Machin - Randomised Clinical Trials

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Randomised Clinical Trials: краткое содержание, описание и аннотация

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Randomi
sed Clinical Trials: Design, Practice and Reporting
This second edition contains extensively revised material throughout, including new chapters covering designs for repeated measures, non-inferiority, cluster and stepped wedge trials. Other new chapters describe data and safety monitoring, biomarker studies, and feasibility studies. Updated and expanded sections discuss situations where multiple organs, different body locations or competing risks are involved, subgroup analysis, and multiple outcomes. Written by an author team with extensive experience in conducting clinical trials, this book: 
Provides comprehensive coverage of randomised clinical trials, ranging from basic to advanced Features several new chapters, updated case studies and examples, and references to changes in regulations Explains basic randomised trials, including the parallel two-group controlled trial with a single outcome measure Covers paired trial designs and trials with more than two interventions Includes a chapter on miscellaneous topics such as adaptive designs, large simple trials, Bayesian methods for very small trials, alpha-spending functions and the predictive probability test  is essential reading for clinicians, nurses, data managers, and medical statisticians involved in clinical trials, and for health practitioners responsible for direct patient care in a clinical trial setting.

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… encourage recruitment, to reduce the numbers receiving pharmacologically inactive systemic treatment, and to increase the likelihood of identifying infrequent adverse events.

Key features include the following:

Design: Single‐centre, randomised double‐blind, placebo‐controlled, randomised 2 : 1 allocation ratio using minimisation,

Endpoint: SASSAD,

Size: 63 patients with moderate‐to‐severe atopic eczema,

Analysis: Comparison of mean group regression slopes over a 12‐week period,

Conclusion: Azathioprine produces a clinically relevant improvement.

Example 1.8 Cross‐over trial – known or suspected hypertension

Kerley, Dolan, James and Cormican (2018) describe a randomised placebo ( P ) controlled, two‐period cross‐over trial of dietary nitrate ( N ) in 20 patients with known or suspected hypertension. The P and N interventions were delivered in beetroot juice in a nitrogen‐depleted or nitrogen‐enriched form, respectively. Thirteen of the individuals were randomised to receive the sequence NP , that is N in Period I of the trial followed by P in Period II, and the other seven were allocated the sequence PN . Amongst the many endpoints, plasma nitrate and ambulatory blood pressure were recorded prior to randomisation, then 7 days later following the start of treatment in Period I and a further 7 days following Period II. The authors concluded:

Our results support … an anti‐hypertensive effect of dietary nitrate … .

Key features include the following:

Design: Single‐centre, randomised placebo‐controlled, two‐period cross‐over trial,

Size: 20 patients with known or suspected hypertension, unequal numbers assigned to the sequences,

Washout: None included,

Endpoints: Plasma nitrate and ambulatory blood pressure,

Analysis: Complex methodology described. All statistical tests were conducted at the two‐sided 0.05 significance level,

Conclusion: Nitrogen‐enriched has an anti‐hypertensive effect.

Example 1.9 Paired design – glaucoma

Glaucoma Laser Trial Research Group (1995) recruited 271 subjects with newly diagnosed primary open‐angle glaucoma, and one eye of each patient was randomly assigned as initial treatment by argon laser ( L ) trabeculoplasty followed by Stepped ( S ) medication ( LS ). The other eye then received the treatments in reverse order, SL . They reported on the 261 eyes and found that measures of visual field status for eyes treated by the sequence LS were slightly better than those treated by SL . The authors’ state:

Statistical significance was attained for only some of the differences, and the clinical implications of such small differences are not known.

Key features include the following:

Design: Multicentre, paired design, compares alternative schedules for administering two procedures – the schedule was randomised to one eye with the other eye receiving the alternative,

Endpoint: Visual field status,

Size: 271 patients with primary open‐angle glaucoma,

Analysis: Comparison of means at particular time points following initiation of treatment using the paired t‐test,

Conclusion: Eyes treated with laser trabeculoplasty first were slightly better than those eyes treated with topical medication first.

Example 1.10 Split‐mouth design – implants for edentulous sites

Pozzi, Agliardi, Tallarico and Barlattani (2012) conducted a trial in 34 partially edentate patients who required at least two single implant‐supported crowns. A split‐mouth design was used in which one of two different prosthetic interfaces and configurations: internal conical connection with back‐tapered collar and platform shifting ( CC ) or external‐hexagon implants with flat‐to‐flat implant‐abutment interface ( EH ), were randomly allocated at each edentulous site. From a total of 88 implants included in the trial, the authors concluded that both implants performed similarly in terms of failure rates.

Key features include the following:

Design: Single‐centre, split‐mouth, random allocation,

Endpoint: Failure rates and marginal bone loss,

Size: 34 patients with 88 edentulous sites,

Analysis: Comparing implants using paired t‐tests at several intervals postrandomisation,

Conclusion: Lower marginal bone loss with CC when compared to EH.

Example 1.11 Cluster trial – hip protectors for the elderly

Meyer, Warnke, Bender and Mülhauser (2003) conducted a trial involving 942 residents from 49 nursing homes. In this cluster trial design, the nursing homes contain ‘clusters’ of residents and the homes (not the individual residents) were randomised, with 25 homes, comprising a total of 459 residents, assigned to the intervention group and 24, with 483 residents, to the usual care (control) group. The intervention comprised a single education session for nursing staff, who then educated residents, and the provision of three hip protectors per resident. The control clusters administered usual care optimised by brief information to nursing staff about hip protectors and the provision of two hip protectors per cluster for demonstration purposes. The main outcome measure was the incidence of hip fractures. There were 21 hip fractures in 21 (4.6%) residents in the intervention group and 42 in 39 (8.1%) residents in the control group – a difference of 3.5% (95% CI 0.3–7.3%, p ‐value = 0.072). The authors concluded:

The introduction of a structured education programme and the provision of free hip protectors in nursing homes may reduce the number of hip fractures.

Key features include the following:

Design: Multicluster, randomised,

Size: 49 nursing homes comprising 942 residents with high risk of falling,

Endpoint: Hip fractures,

Analysis: Chi‐squared test adjusted for cluster randomisation,

Conclusion: A structured education programme and the provision of hip protectors may reduce the number of hip fractures.

Example 1.12Single arm – discrete de novo lesions in a coronary artery

Erbel, Di Mario, Bartunek, et al . (2007) describe a non‐randomised multicentre trial involving 8 centres in which 63 patients were enrolled with single de novo lesions in a native coronary artery. In these patients, a total of 71 biodegradable magnesium stents were successfully implanted. The (composite) primary endpoint was the rate of major adverse cardiac events (MACE) defined as any one of: cardiac death, Q‐wave myocardial infarction or target lesion revascularisation at 4 months poststent implant. This was to be compared with an anticipated rate of 30%. They reported a rate of MACE at 4 months of 15/63 (23.8%); all of which were attributed to target lesion revascularisation (there were no deaths or Q‐wave myocardial infarctions) and concluded:

… biodegradable magnesium stents can achieve an immediate angiographic result similar to … other metal stents ….

Nevertheless, the authors also commented in their Discussion:

The absence of randomisation precludes direct comparison with other techniques of percutaneous revascularisation.

Key features include the following:

Design: No comparison group hence non‐randomised, multicentre,

Size: 71 stents in 63 patients,

Endpoint: Composite endpoint – MACE,

Analysis: Proportion experiencing MACE with 95% confidence interval,

Conclusion: Bioabsorbable stents can achieve an immediate angiographic result similar to other metal stents and can be safely degraded.

The above examples of successfully completed clinical trials illustrate a wide range of topics investigated. These include patients with disease (breast cancer, colon cancer, eczema, glaucoma, malaria and diabetes mellitus), those requiring coronary artery stents or hand surgery, elderly residents of nursing homes, patients aged 25 years or more requiring at least two implant‐supported crowns for dental caries, healthy individuals and those requiring vaccinations. Although not included here, trials are conducted, for example, to evaluate different diagnostic procedures, different bed mattresses to reduce the incidence of bed sores, different dressings for wounds of all types and fertility regulation options for male and females of reproductive potential.

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