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Related Concept Videos

Reaction Rate02:53

Reaction Rate

62.8K
The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
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Related Rates01:18

Related Rates

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When two or more physical quantities are linked by a single relationship, a change in one variable necessarily affects the others. This interdependence forms the basis of related rates analysis, which examines how different quantities change with respect to time. A classic physical example is an expanding balloon, where the size of the balloon changes continuously as air is added.For a hot air balloon, the inflated envelope is commonly idealized as a perfect sphere to simplify mathematical...
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Speciation Rates01:07

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Measuring Reaction Rates03:09

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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Rate-Determining Steps03:08

Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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Concentration and Rate Law03:03

Concentration and Rate Law

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The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as:
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Updated: Jan 29, 2026

Ambulatory ECG Recording in Mice
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Eligibility Rates for Ambulatory EVAR.

Raphaëlle Sylvestre1, Raphaël Coscas1, Isabelle Javerliat2

  • 1Service de Chirurgie Vasculaire, Hôpital Ambroise Paré, AP-HP, Boulogne-Billancourt, France; UMR 1018, Inserm-Paris11 - CESP, Université Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay, Hôpital Paul Brousse, Villejuif, France.

Annals of Vascular Surgery
|February 9, 2019
PubMed
Summary

Ambulatory endovascular repair of abdominal aortic aneurysms (EVAR-Ambu) is feasible for many patients. This approach offers real medicoeconomic benefits for the healthcare system, though individual financial gains are modest.

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Area of Science:

  • Vascular Surgery
  • Health Economics
  • Medical Technology Assessment

Background:

  • Endovascular repair of abdominal aortic aneurysms (EVAR) and percutaneous closure systems enable ambulatory treatment.
  • Ambulatory EVAR (EVAR-Ambu) feasibility and medicoeconomic impact require evaluation.

Purpose of the Study:

  • To assess the eligibility rate for ambulatory EVAR (EVAR-Ambu).
  • To evaluate the potential medicoeconomic impact of EVAR-Ambu.

Main Methods:

  • Retrospective analysis of 117 patients undergoing EVAR between 2014-2016.
  • Eligibility criteria included normal surgical risk (HAS/SVS scores), logistic feasibility, and anatomical suitability for percutaneous closure.
  • Medicoeconomic evaluation based on length of stay costs and revenue.

Main Results:

  • 37%-49% of patients were eligible for EVAR-Ambu via percutaneous route based on HAS/SVS criteria.
  • An additional 10%-11% were eligible if conventional surgical approach was compatible.
  • EVAR-Ambu showed a positive balance of +122€ per patient compared to 1-2 night hospitalizations (+10€ to +119€).

Conclusions:

  • EVAR-Ambu is achievable in a significant portion of infrarenal AAA patients.
  • The approach presents real medicoeconomic advantages for the healthcare system.
  • Prospective studies are needed to confirm the safety of EVAR-Ambu in clinical practice.