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Evaluating Study Design Rigor in Preclinical Cardiovascular Research: A Replication Study.

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Methodological rigor in preclinical cardiovascular research, including sex as a variable, randomization, blinding, and sample size estimation, remains low and has not improved over a decade. Further efforts are needed to enhance study design quality and reproducibility.

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Area of Science:

  • Cardiovascular Research
  • Preclinical Studies
  • Scientific Reproducibility

Background:

  • Methodological rigor is crucial for reproducible preclinical cardiovascular research.
  • Lack of reproducibility hinders the translation of research findings into clinical practice.
  • Uncertainty in research results impacts public trust and acceptance.

Purpose of the Study:

  • To evaluate the reporting of study design elements (SDEs) in preclinical cardiovascular research.
  • To assess trends in SDE inclusion from 2011 to 2021.
  • To compare SDE inclusion between studies with human/animal substudies versus animal-only studies and across different animal models.

Main Methods:

  • Screened preclinical cardiovascular research articles published between 2011-2021 for SDEs: sex as a biological variable, randomization, blinding, and sample size power estimation.
  • Replicated and extended a previous study by Ramirez et al. (2017).
  • Analyzed differences in SDE inclusion based on study type (human/animal vs. animal-only) and animal model size.

Main Results:

  • Inclusion of SDEs was low: 15.2% (sex), 30.4% (randomization), 32.1% (blinding), 8.2% (sample size estimation).
  • No significant increase in SDE reporting was observed over the 10-year period.
  • Significant differences in randomization and sample size estimation were found between human/animal substudies and animal-only studies.

Conclusions:

  • Methodological rigor in preclinical cardiovascular research is inconsistent across study types and animal models.
  • Reporting of SDEs has not improved between 2011 and 2021.
  • Increased efforts are necessary to integrate rigorous study design elements into preclinical cardiovascular research.