Health and Fitness

Low dose aspirin is downgraded for stopping heart problems

A current article posted within the Journal of the American Medical Association (JAMA) analyzed aspirin use to stop heart problems (CVD) and colorectal most cancers (CRC). 

Report: Aspirin Use to Prevent Cardiovascular Disease and Colorectal Cancer Updated Evidence Report and Systematic Review for the US Preventive Services Task Force. Image Credit: Evgenyrychko / Shutterstock


CVD is the main reason for mortality within the United States (US). Existing reviews indicated that the low-dose aspirin used to stop main CVD might additionally assist to stop CRC.

The US Preventive Services Task Force (USPSTF) introduced CVD-risk- and age-based aspirin utilization tips for CRC and CVD prevention in 2016. The USPSTF acknowledged there was insufficient proof to evaluate the profit and hazard ranges of beginning aspirin remedy in people aged <50 years or in adults aged 70 or older. Further, because the USPSTF 2016 tips had been launched, three further trials of aspirin for main prevention have been reported.

About the research

In the current systematic evaluation, the researchers analyzed present proof of the harms and advantages of aspirin in CRC and first CVD prevention to replace the USPSTF. In addition, the crew assessed the Cochrane central register of managed trials from January 2021 and carried out a literature search from January 21, 2022. The key outcomes of the current investigation had been colorectal most cancers incidence and demise, extreme bleeding, hemorrhagic stroke, heart problems occasions and fatality, and all cause-death. 

The authors chosen randomized medical trials (RCTs) of low-dose aspirin (100 mg/day) in comparison with placebo or no remedy in main prevention populations within the English language for the evaluation. Data was extracted by way of single extraction and double-checked by a second reviewer. In addition, Peto fixed-effects meta-analysis was used for quantitative synthesis. Eleven RCTs comprising 134,470 research and one pilot trial with 400 investigations of low-dose aspirin remedy for main CVD prevention had been included within the current analysis. 

The Mantel-Haenszel fixed-effects and restricted most probability random-effects fashions had been used to conduct sensitivity evaluation. Trials addressing secondary CVD prevention and all aspirin dosages had been included in sensitivity analyses for CRC outcomes. These analyses examined totally different indications and aspirin doses encompassing complete post-trial observational information. 

Findings and discussions

The research outcomes indicated that using low-dose aspirin was linked to a substantial discount within the odds of CV occasions corresponding to complete myocardial infarction (MI), ischemic stroke, and main CVD occasions. Individualized CVD outcomes had been substantial, with a bonus of the same dimension. Interestingly, the crew reported that aspirin was not proven to be drastically associated to a decrease threat of CVD or all-cause demise at as much as 10 years of follow-up.

The authors discovered that the benefits of low-dose aspirin remedy for CRC had been inconclusive in medical trials. Furthermore, the outcomes had been extremely various relying on the period of follow-up and statically related solely when long-standing observational follow-up exceeding randomized trial intervals was taken under consideration. 

The present information indicated that low-dose aspirin was linked to substantial hikes in total main and site-specific bleeding, together with extracranial and intracranial hemorrhage, each of which had been of comparable dimension. Unfortunately, the authors couldn’t decide how aspirin enteric coating or dosage modifications could scale back bleeding threat because of the inadequacy of knowledge within the current main CVD prevention investigations. Yet, present observational analysis has demonstrated that top aspirin doses had been linked to elevated bleeding threat.

The outcomes of sensitivity analyses performed on this evaluation revealed discrepancies in outcomes between RCTs accomplished earlier than and after the difficulty of the grownup remedy panel III (ATP III) guideline in 2001. According to the sensitivity analyses, MI advantages, main CVD occasions, and most bleeding dangers had been decreased in publish–ATP III trials, whereas ischemic stroke arose as a statistically related profit in publish–ATP III pooled analyses. These findings had been in keeping with a earlier research evaluating pre–ATP III and publish–ATP III trials. However, the scientists acknowledged that further sources of variability, corresponding to aspirin dosage and trial inhabitants traits, had been more likely to affect these outcomes.

Further, regardless of the expectation that advantages would diminish over time as aspirin use converged, the CRC outcomes sensitivity analyses found constructive aspirin use results on CRC incidence for as much as roughly 20 years.


Overall, the current findings depicted that low-dose aspirin was linked to minor absolute threat reductions in main CV occasions and slight absolute threat elevations in main bleeding. The outcomes for CRC had been much less constant and considerably variable.

The findings of the current meta-analysis had been just like these of the USPSTF’s prior systematic evaluation and quite a few different current meta-analyses, revealing that aspirin-induced slight absolute CVD incidence reductions had been carefully mirrored by will increase in main bleeding. The authors really helpful that an in depth low-dose aspirin research evaluating CRC results 20 years following randomization could be acceptable to analyze the marginal impacts of aspirin utilization within the present CRC screening methods setting. In addition, future research ought to cowl baseline CRC evaluation and CRC threat variables, that are potential confounders that weren’t addressed within the majority of the CVD preventive trials included on this evaluation.

Journal reference:

  • Guirguis-Blake JM, Evans CV, Perdue LA, Bean SI, Senger CA. Aspirin Use to Prevent Cardiovascular Disease and Colorectal Cancer: Updated Evidence Report and Systematic Review for the US Preventive Services Task Force. JAMA. 2022;327(16):1585–1597, DOI:10.1001/jama.2022.3337,

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