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Rapidly Varying Flow01:24

Rapidly Varying Flow

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Related Experiment Video

Updated: Jul 11, 2025

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
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What About All the Recent "Negative" FFR Trials?

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Fractional flow reserve (FFR) is now questioned after recent negative trials. Critical examination of study design and interpretation is needed to understand FFR

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Area of Science:

  • Cardiovascular medicine
  • Interventional cardiology
  • Clinical trial design

Background:

  • Fractional flow reserve (FFR) has evolved significantly over 30 years, achieving class IA guideline recommendations.
  • Recent 2021 trials (FLOWER-MI, RIPCORD-2, FUTURE, FAME 3) yielded negative results, prompting re-evaluation of FFR's utility.

Purpose of the Study:

  • To critically examine recent randomized trials concerning FFR.
  • To draw insights into FFR, study design, and interpretation methodologies.
  • To emphasize the importance of discordant decisions between angiography and FFR.

Main Methods:

  • Review and critical analysis of key randomized controlled trials published in 2021.
  • Focus on trial design, interpretation of results, and clinical endpoints.
  • Comparison of FFR findings against traditional angiography.

Main Results:

  • Recent large-scale randomized trials have reported negative outcomes for FFR-guided interventions.
  • The interpretation of these "negative" trials requires careful consideration of study design flaws and endpoint selection.
  • Discordance between angiography and FFR warrants further investigation.

Conclusions:

  • The clinical utility of FFR may need re-evaluation in light of recent trial data.
  • Improved study designs and focus on relevant clinical endpoints are crucial for future research.
  • Percutaneous coronary intervention guided by FFR may offer benefits in specific patient subsets, necessitating further research into optimal patient selection and outcome measures.