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Related Concept Videos

Switching of BJT01:22

Switching of BJT

Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Diode: Reverse bias01:14

Diode: Reverse bias

A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
Modes of Operations of BJT01:21

Modes of Operations of BJT

A Bipolar Junction Transistor (BJT) is a versatile component in electronics, functioning in four distinct modes based on the biasing of its junctions: active, saturation, cut-off, and inverted modes.
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Modeling of Diode Reverse Characteristics01:14

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In electronic circuits, reverse-biased diode configurations are critical for regulating voltage levels. Zener diodes exploit the reverse breakdown phenomenon and exhibit a controlled breakdown at a specific Zener voltage (VZ). They are designed to maintain a constant voltage across their terminals and are commonly used for voltage regulation in circuits.
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Related Experiment Video

Updated: May 10, 2026

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation
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The reverse mode switch algorithm: how well does it work?

Finn Akerström1, Miguel A Arias, Marta Pachón

  • 1Cardiac Arrhythmia and Electrophysiology Unit, Department of Cardiology, Hospital Virgen de Salud, Toledo, Spain.

Heart Rhythm
|June 5, 2013
PubMed
Summary
This summary is machine-generated.

The Reverse Mode Switch (RMS) algorithm often inappropriately switches pacing modes due to premature ventricular complexes (PVCs), leading to unnecessary right ventricular pacing. Patients with many PVCs may experience frequent, unintended mode switching.

Keywords:
%AP%VPAVAV conductionCRTEGMICDImplantable cardioverter-defibrillatorLRLLVEFMVPPVCPacing modePremature ventricular complexRMSRVReverse Mode SwitchRight ventricular pacingatrioventricularcardiac resynchronization therapyelectrogramimplantable cardioverter-defibrillatorleft ventricular ejection fractionlower rate limitmanaged ventricular pacingpercentage of atrial pacingpercentage of ventricular pacingpremature ventricular complexright ventricular

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Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics
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Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics

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Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • The Reverse Mode Switch (RMS) algorithm aims to reduce right ventricular pacing by switching from AAI(R) to DDD(R) mode upon detecting atrioventricular (AV) conduction loss.
  • The clinical performance and appropriateness of RMS algorithm-driven mode switches are not well-established.

Purpose of the Study:

  • To evaluate the appropriateness of Reverse Mode Switch (RMS) episodes in patients with implantable cardioverter-defibrillators.
  • To analyze the triggers for mode switching and their impact on pacing parameters.

Main Methods:

  • Retrospective analysis of patients with TELIGEN dual-chamber implantable cardioverter-defibrillators utilizing the RMS algorithm.
  • Classification of RMS episodes as appropriate (AV conduction loss) or inappropriate (non-AV conduction loss) based on electrogram data.
  • Recording of cumulative ventricular pacing percentage and premature ventricular complexes (PVCs).

Main Results:

  • Of 21 patients, 19 experienced RMS episodes (mean 527/month).
  • 16% of 172 analyzed RMS episodes were appropriate, while 84% were inappropriate.
  • Premature ventricular complexes (PVCs) caused 91% of inappropriate RMS episodes, with a positive correlation between total RMS episodes and PVCs per month (P < .0005).

Conclusions:

  • The majority of RMS episodes inappropriately trigger a switch to DDD(R) mode, primarily due to PVCs.
  • Patients with the RMS algorithm and a high burden of PVCs are at risk for significant unnecessary right ventricular pacing.