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Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Related Experiment Video

Updated: Mar 16, 2026

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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[A simple method for AV-delay determination in dual chamber pacemakers].

W Koglek1, W Kranig2, M Kowalski2

  • 12. Medizinische Abteilung Landeskrankenhaus Klagenfurt St. Veiter Str. 47 A-9020 Klagenfurt, Germany.

Herzschrittmachertherapie & Elektrophysiologie
|August 13, 2016
PubMed
Summary

This study introduces a faster method for optimizing atrioventricular delay (AVD) in pacemakers using surface electrocardiograms (ECG). The new ECG-based AVD optimization significantly correlates with optimal cardiac output, offering a simpler alternative to invasive methods.

Keywords:
Key words AV-delay – dual chamber pacemaker – surface ECG

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Context:

  • Dual-chamber pacing requires precise atrioventricular delay (AVD) adjustment for optimal hemodynamic function.
  • Current AVD optimization methods are time-consuming and often require invasive procedures.

Purpose:

  • To develop and validate a novel, rapid method for approximating optimal AVD using surface electrocardiography (ECG).
  • To establish a standard value for atrial-to-ventricular conduction time based on ECG measurements.

Summary:

  • A new algorithm uses the interval from the end of the P-wave (atrial excitation) to the peak of the QRS complex (ventricular excitation) on a surface ECG to approximate the optimal AVD.
  • This method considers individual atrial and ventricular conduction times, aiming to close the mitral valve at the onset of ventricular pressure increase.
  • Validation in 13 patients showed a strong correlation (r=0.982) between ECG-derived AVD and PA catheter-optimized AVD, with most measurements achieving optimal cardiac output.

Impact:

  • Provides a faster, non-invasive method for AVD optimization in pacemaker patients.
  • Potentially reduces procedure time and patient discomfort associated with traditional optimization techniques.
  • Further studies are warranted to compare this ECG-based algorithm with other AVD optimization techniques.