SynthesisCMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne2011

Efficacy of statins for primary prevention in people at low cardiovascular risk: a meta-analysis.

Marcello Tonelli, Anita Lloyd, Fiona Clement, Jon Conly, Don Husereau, Brenda Hemmelgarn, Scott Klarenbach, Finlay A McAlister, Natasha Wiebe, Braden Manns and 1 more

Open access · goldAbstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne, 2011. The graph read 3 numbers from its abstract, feeding 2 cells of the map: it supports the treatment in 2. Cited by 45 papers, 9 of them syntheses that pooled it.

3numbers the graph read from it
2cells of the map it votes in
45citing papers in PubMed, 9 pooled it
17.7field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

← favours the treatmentfavours the comparator →
0.51 · no effect
Cardiovascular eventsfavours the treatment · against placebo · ascvd, t2dfeeds one cell of the map
RR 0.810.68 to 0.96
Patients in the statin group were also significantly less likely than controls to have nonfatal myocardial infarction (RR 0.64, 95% CI 0.49-0.84) and nonfatal stroke (RR 0.81, 95% CI 0.68-0.96).
All-cause mortalityfavours the treatment · against placebo · ascvd, t2dfeeds one cell of the map
RR 0.900.84 to 0.97
All-cause mortality was significantly lower among patients receiving a statin than among controls (relative risk [RR] 0.90, 95% confidence interval [CI] 0.84-0.97) for trials with a 10-year risk of cardiovascular disease < 20% [primary analysis] and 0.83, 95% CI 0.73-0.94, for trials with 10-year risk < 10% [sensitivity analysis]).
Cardiovascular eventsfavours the treatment · against placebo · ascvd, t2dfeeds one cell of the map
RR 0.640.49 to 0.84
Patients in the statin group were also significantly less likely than controls to have nonfatal myocardial infarction (RR 0.64, 95% CI 0.49-0.84) and nonfatal stroke (RR 0.81, 95% CI 0.68-0.96).

clause the extractor read what became the number

2 · Its place on the map

Where it lands on the map

Rows are treatments, columns are outcomes. The coloured squares are the cells this paper feeds, coloured by the vote it casts there. Click one to jump to what this paper adds to it.

supports the treatmentfavours the comparatorno clear differenceread, but no usable result
3 · What it changes

What it adds to each cell

For every cell the paper feeds: the belief in the claim with and without this paper, and this paper's estimate drawn against every other readable study in the cell. The ringed dot is this paper.

Statins×cardiovascular events

SupportsOpen on the map →What to test next →

30 readable studies in this cell: 18 favour the treatment, 11 find no difference, 1 favour the comparator.

Belief with this paper
0.86replicated · 12 families support, 2 contradict · against placebo
Without itNot a counted family in this claim, so removing it changes nothing.
← favours the treatmentfavours the comparator →
1 · no effect
HR 0.750.64 to 0.88
NCT023442907,769 enrolled · 2015
HR 0.640.48 to 0.84
HR 1.781.00 to 3.17
NCT03944512102 enrolled · 2019
RR 0.670.37 to 1.19

This paper's own estimate is on a different scale from the rest of the cell, so it is not drawn here.

Statins×all-cause mortality

SupportsOpen on the map →What to test next →

14 readable studies in this cell: 4 favour the treatment, 9 find no difference, 1 favour the comparator.

Belief with this paper
0.50contested · 3 families support, 2 contradict · against placebo
Without itNot a counted family in this claim, so removing it changes nothing.
← favours the treatmentfavours the comparator →
1 · no effect
NCT023442907,769 enrolled · 2015
HR 0.880.70 to 1.12
HR 1.000.90 to 1.12
NCT03944512102 enrolled · 2019
RR 0.670.37 to 1.19
RR 0.990.89 to 1.11

This paper's own estimate is on a different scale from the rest of the cell, so it is not drawn here.

4 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

5 · Its place in the literature

Who cites it

45 citing papers in PubMed, 9 syntheses or guidelines pooled it, 152 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Pooled it
  5. Pooled it
  6. Pooled it
  7. Statins and Cardiovascular Primary Prevention in CKD: A Meta-Analysis.Clinical journal of the American Society of Nephrology : CJASN · 2015 · on this map
    Pooled it
  8. Guideline
  9. Clinical review: Statins and trauma--a systematic review.Critical care (London, England) · 2013
    Pooled it
  10. Trial
  11. Trial
  12. Trial
  13. Article
  14. Article
  15. Review
  16. Thermal Remodeling of Human HDL Particles Reveals Diverse Subspecies.Journal of the American Society for Mass Spectrometry · 2024
    Article
  17. Article
  18. Article
  19. Review
  20. Article
6 · The record

Corrections and comments

7 · Who and what money

Authors and funding

11 authors at 1 institution in 1 country.

Marcello TonelliDepartment of Medicine, University of Alberta, Edmonton, Alta. mtonelli-admin@med.ualberta.ca
Anita Lloyd
Fiona Clement
Jon Conly
Don Husereau
Brenda Hemmelgarn
Scott Klarenbach
Finlay A McAlister
Natasha Wiebe
Braden Manns
Alberta Kidney Disease Network
University of Alberta · CA

Funding

No grant is acknowledged in the PubMed record.

8 · The paper itself

Abstract

The marked sentences are the ones the graph read a number from.

backgroundStatins were initially used to improve cardiovascular outcomes in people with established coronary artery disease, but recently their use has become more common in people at low cardiovascular risk. We did a systematic review of randomized trials to assess the efficacy and harms of statins in these individuals.

methodsWe searched MEDLINE and EMBASE (to Jan. 28, 2011), registries of health technology assessments and clinical trials, and reference lists of relevant reviews. We included trials that randomly assigned participants at low cardiovascular risk to receive a statin versus a placebo or no statin. We defined low risk as an observed 10-year risk of less than 20% for cardiovascular-related death or nonfatal myocardial infarction, but we explored other definitions in sensitivity analyses.

resultsWe identified 29 eligible trials involving a total of 80,711 participants. All-cause mortality was significantly lower among patients receiving a statin than among controls (relative risk [RR] 0.90, 95% confidence interval [CI] 0.84-0.97) for trials with a 10-year risk of cardiovascular disease < 20% [primary analysis] and 0.83, 95% CI 0.73-0.94, for trials with 10-year risk < 10% [sensitivity analysis]). Patients in the statin group were also significantly less likely than controls to have nonfatal myocardial infarction (RR 0.64, 95% CI 0.49-0.84) and nonfatal stroke (RR 0.81, 95% CI 0.68-0.96). Neither metaregression nor stratified analyses suggested statistically significant differences in efficacy between high-and low-potency statins, or larger reductions in cholesterol.

interpretationStatins were found to be efficacious in preventing death and cardiovascular morbidity in people at low cardiovascular risk. Reductions in relative risk were similar to those seen in patients with a history of coronary artery disease.

Indexed as

Primary PreventionAngina, UnstableCardiovascular DiseasesDiabetes MellitusHumansHydroxymethylglutaryl-CoA Reductase InhibitorsMyocardial InfarctionMyocardial RevascularizationNeoplasmsRandomized Controlled Trials as TopicRhabdomyolysisRisk AssessmentStrokeHydroxymethylglutaryl-CoA Reductase Inhibitors

Identifiers

PMID21989464
PMCPMC3216447
OpenAlexW2101094196

What Socratic holds

Texttitle and abstract
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.