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Related Concept Videos

Current Dividers01:10

Current Dividers

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In parallel electrical connections, resistors are linked between the same pair of nodes, creating an equal voltage across each resistor. Kirchhoff's current law is applied to these connections, establishing that the sum of currents through these resistors equals the source current. Utilizing Ohm's law, the source current is determined as the product of the source voltage and the sum of the reciprocals of individual resistances. This relationship simplifies the process of finding the current...
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Electrical Current01:10

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Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836).
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Current Density01:21

Current Density

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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Eddy Currents01:25

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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Displacement Current01:19

Displacement Current

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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Charge and Current01:14

Charge and Current

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Electric charge is the most fundamental quantity in an electric circuit. The effects of electric charge are encountered daily, such as when a wool sweater sticks to the human body or when a person receives a shock while walking on a carpet.
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Related Experiment Video

Updated: Feb 9, 2026

A Standardized Procedure of Dressing Management for Toxic Epidermal Necrolysis
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A Standardized Procedure of Dressing Management for Toxic Epidermal Necrolysis

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[Current management of no-reflow].

Bilal Boztosun1, Yilmaz Güneş, Cevat Kirma

  • 1Kartal Koşuyolu Yüksek Ihtisas Eğitim ve Araştirma Hastanesi, Kardiyoloji Kliniği, Istanbul, Türkiye. bboztosun@hotmail.com

Anadolu Kardiyoloji Dergisi : AKD = the Anatolian Journal of Cardiology
|September 1, 2006
PubMed
Summary

Restoring blood flow to the heart’s surface does not guarantee tissue perfusion, a phenomenon known as no-reflow. Understanding its mechanisms is key to improving heart function.

Area of Science:

  • Cardiovascular biology
  • Myocardial infarction research
  • Vascular physiology

Context:

  • Epicardial blood flow restoration after myocardial infarction does not always ensure microvascular reperfusion.
  • The "no-reflow" phenomenon, where tissue perfusion remains impaired despite open epicardial arteries, presents a significant clinical challenge.
  • Mechanisms underlying no-reflow are complex and can vary between individual patients.

Purpose:

  • To explore the mechanisms behind the no-reflow phenomenon after restoring epicardial blood flow.
  • To highlight the disconnect between epicardial reperfusion and actual tissue perfusion.
  • To emphasize the need for understanding no-reflow for effective therapeutic strategies.

Summary:

  • Restoration of epicardial blood flow does not guarantee microvascular reperfusion or tissue perfusion, leading to the no-reflow phenomenon.

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  • The underlying mechanisms of no-reflow are uncertain and may differ individually, impacting treatment approaches.
  • Improving tissue-level perfusion is crucial for beneficial effects on left ventricular function.

    • Impact:

    • Enhanced understanding of no-reflow mechanisms can guide the development of targeted therapies.
    • Improved diagnostic methods for identifying and assessing no-reflow are needed.
    • Effective treatment strategies for no-reflow are essential for optimizing cardiac function post-intervention.