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Related Concept Videos

Constant Volume Calorimetry02:41

Constant Volume Calorimetry

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Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
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Volume of Distribution01:20

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The apparent volume of distribution (Vd) is a crucial pharmacokinetic parameter representing the hypothetical body fluid volume into which a drug disperses. It is calculated based on the total amount of drug in the body (estimated from the administered dose and bioavailability) divided by the plasma drug concentration. The total amount of drug in the body does not directly refer to the dose given but is derived by accounting for absorption, distribution, metabolism, and excretion processes.
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Problem Solving: Volume01:13

Problem Solving: Volume

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The volume of a fuel tank mounted on the wing of a jet aircraft can be modeled using the concept of solids of revolution. In this case, the tank is formed by rotating a two-dimensional region, defined by a mathematical function, about the x-axis. The region extends along the axis from zero to two meters, and the resulting three-dimensional shape is symmetric about the axis of rotation. Because the boundary curve lies directly against the axis, the disk method is an appropriate technique for...
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Respiratory Volumes01:15

Respiratory Volumes

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
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Work Done During Volume Change01:17

Work Done During Volume Change

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In mechanics, work is done on an object when the force acting on it displaces the object. In thermodynamics, work done on a system can be estimated when the system's volume changes during any thermodynamic process.
Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
The work done by the gas on the piston can be expressed as
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Regulation of Stroke Volume01:27

Regulation of Stroke Volume

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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
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Bringing the Visible Universe into Focus with Robo-AO
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Volume brings value.

Bill D Gogas1, Shao-Liang Chen1

  • 1Nanjing First Hospital, Nanjing Medical University, Nanjing, China.

Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions
|October 21, 2018
PubMed
Summary
This summary is machine-generated.

High-volume percutaneous coronary intervention (PCI) operators maintain good clinical outcomes even at lower-volume centers. Current guidelines on PCI volume may not fully guarantee optimal patient outcomes.

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Area of Science:

  • Interventional Cardiology
  • Healthcare Quality
  • Clinical Competency

Background:

  • This study examines the clinical outcomes of high-volume percutaneous coronary intervention (PCI) operators who transition to lower-volume institutions.
  • It questions the adequacy of current U.S. guidelines suggesting a minimum of 50 PCIs annually for maintaining operator competency.

Discussion:

  • The findings suggest that operator experience and skill, rather than solely procedure volume, are critical for maintaining excellent clinical outcomes.
  • The current benchmark of 50 PCIs annually may be an insufficient metric for ensuring optimal patient results in complex coronary interventions.

Key Insights:

  • High-volume PCI operators demonstrate sustained competency and positive clinical outcomes despite changes in practice setting.
  • Operator experience transcends institutional volume, highlighting the need for a more nuanced definition of competency.

Outlook:

  • Future research should focus on developing a comprehensive definition of operator experience, particularly in regions like the Asia-Pacific known for complex interventions.
  • Studies should aim to establish competency thresholds that account for procedural complexity and diverse operator backgrounds.