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Related Concept Videos

Rapidly Varying Flow01:24

Rapidly Varying Flow

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...
Urodynamic Studies: Uroflowmetry01:19

Urodynamic Studies: Uroflowmetry

Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
Major Losses in Pipes01:28

Major Losses in Pipes

When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
Net Change Theorem01:22

Net Change Theorem

The Net Change Theorem is a fundamental principle in calculus that establishes a direct relationship between a function’s rate of change and its accumulated change over an interval. Mathematically, it states that the definite integral of a function's derivative over a given interval [a,b] yields the net change in the original function:This theorem has significant applications in various real-world scenarios, including physics, economics, and engineering. A particularly useful application is in...
Gradually Varying Flow01:29

Gradually Varying Flow

Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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Underflow Gates

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Related Experiment Video

Updated: May 14, 2026

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Fractional flow reserve at 2013: an update.

S Sattur1, A Mathur, S Acharji

  • 1Division of Cardiology, Robert Packer Hospital Guthrie Health Services, Sayre, PA, USA.

Minerva Cardioangiologica
|February 6, 2013
PubMed
Summary
This summary is machine-generated.

Fractional flow reserve (FFR) is crucial for evaluating coronary artery blockages in stable heart disease. This review examines FFR

Related Experiment Videos

Last Updated: May 14, 2026

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Physiology

Background:

  • Fractional flow reserve (FFR) is a key diagnostic tool for intermediate coronary lesions in stable coronary syndromes.
  • Accurate assessment of hemodynamic significance guides revascularization decisions.

Purpose of the Study:

  • To review current evidence supporting FFR use in guiding cardiovascular interventions.
  • To compare FFR with other invasive and non-invasive assessment methods.
  • To examine FFR's correlation with symptoms and major adverse cardiovascular events, referencing FAME-2 study results.

Main Methods:

  • Literature review and critical analysis of existing data.
  • Examination of FFR's relationship with clinical outcomes and symptom severity.
  • Discussion of recent advancements and future research directions.

Main Results:

  • FFR is valuable for guiding interventions in stable coronary syndromes.
  • The FAME-2 study provides critical data on FFR's clinical utility.
  • Emerging technologies like instantaneous wave-free ratio and CT-FFR are discussed.

Conclusions:

  • FFR plays a significant role in current cardiovascular practice.
  • Further research is needed to address scientific gaps and refine FFR-guided strategies.
  • Understanding FFR's limitations and emerging applications is essential.