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Related Concept Videos

Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
Power and Energy01:12

Power and Energy

The power and energy delivered to an element are subjects of great significance in the field of electrical engineering. It is a well-known fact that a 100-watt light bulb emits more light than a 60-watt one. Therefore, power and energy calculations play a crucial role in the analysis of electrical circuits.
Power, defined as the time rate of expending or absorbing energy, is quantified in units called watts (W). The relation between power and energy is mathematically given as
Multiple Voltage Sources01:25

Multiple Voltage Sources

Generally, a single battery is not enough to power some devices. In such cases, batteries can be combined in two ways: in series or in parallel.
In series, the positive terminal of one battery is connected to the negative terminal of another battery. Hence, the voltage of each battery is added to give the net voltage, which is increased because each battery boosts the electrons that enter it. The same current flows through each battery because they are connected in series.
Batteries are...
Independent and Dependent Sources01:18

Independent and Dependent Sources

In electrical circuits, sources play a crucial role in providing power for the operation of the circuit. These sources can be broadly categorized into two types: independent and dependent.
Independent voltage or current sources supply a fixed amount of voltage or current, respectively, which is unaffected by other elements within the circuit. These are represented using specific symbols. Independent voltage sources are symbolized with polarities (+ and -), indicating the direction of the...
Energy and Power Signals01:17

Energy and Power Signals

In an electrical system with a resistor, voltage and current signals facilitate the measurement of power and energy across the resistor. For a continuous-time signal, the total energy over a time interval is defined as the integral of the square of the signal's magnitude over that interval. Mathematically, this is expressed as:
Potential-Energy Criterion for Equilibrium01:16

Potential-Energy Criterion for Equilibrium

Potential energy or potential function plays an essential role in determining the stability of a mechanical system. If a system is subjected to both gravitational and elastic forces, the potential function of the system can be expressed as the algebraic sum of gravitational and elastic potential energy. If the system is in equilibrium and is displaced by a small amount, then the work done on the system equals the negative of the change in the system's potential energy from the initial to the...

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Related Experiment Video

Updated: Jun 17, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Pulmonary Vein Isolation: Comparing different energy sources - independent or complementary use?

Marina Marins1, Carina Muresan1, Maya Verma2

  • 1McGill University Health Center, Department of Medicine, Division of Cardiology, Canada.

Indian Pacing and Electrophysiology Journal
|June 15, 2026
PubMed
Summary
This summary is machine-generated.

Pulsed-field ablation (PFA) offers a faster, safer alternative for pulmonary vein isolation in atrial fibrillation treatment. While effective for pulmonary veins, thermal ablation remains crucial for other cardiac structures.

Keywords:
Atrial fibrillationCryoablationDual-energy ablationPulmonary vein isolationPulsed-field ablationRadiofrequency ablation

Related Experiment Videos

Last Updated: Jun 17, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Atrial fibrillation (AF) treatment often involves pulmonary vein isolation (PVI).
  • Conventional thermal ablation (radiofrequency and cryoablation) carries risks and procedural complexities.
  • Pulsed-field ablation (PFA) is a novel non-thermal modality for PVI.

Purpose of the Study:

  • To compare pulsed-field ablation (PFA) with conventional thermal ablation for pulmonary vein isolation (PVI).
  • To evaluate the efficacy, safety, and limitations of PFA in atrial fibrillation treatment.
  • To explore the potential role of PFA in conjunction with thermal ablation for comprehensive cardiac lesioning.

Main Methods:

  • Review of randomized controlled trials and large registries comparing PFA with RF and cryoablation.
  • Analysis of PFA's mechanism of action: irreversible electroporation of cardiomyocytes.
  • Evaluation of clinical outcomes including procedural time, efficacy, and adverse events.

Main Results:

  • PFA demonstrates shorter procedural times and comparable/superior efficacy for paroxysmal AF PVI.
  • PFA significantly reduces risks of esophageal injury, phrenic nerve palsy, and pulmonary vein stenosis.
  • PFA limitations include hemolysis, coronary vasospasm, need for deep sedation, and uncertain durability of non-PVI lesions.

Conclusions:

  • PFA is a promising energy source for PVI, offering safety and efficiency advantages.
  • Thermal ablation remains essential for lesions beyond the pulmonary veins, such as the mitral and cavotricuspid isthmuses.
  • Combined RF and PFA strategies are under investigation to enhance lesion durability and create comprehensive cardiac lesions.