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Related Concept Videos

Correlation between ECG and Cardiac Cycle01:25

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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Related Experiment Video

Updated: May 27, 2025

Utilizing Percutaneous Ventricular Assist Devices in Acute Myocardial Infarction Complicated by Cardiogenic Shock
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The QRS Interval After Pacemaker Implant: An Independent Mortality Risk Factor.

Gabriel Vanerio1,2

  • 1Arrhythmia Service CASMU Montevideo.

Critical Pathways in Cardiology
|February 20, 2025
PubMed
Summary
This summary is machine-generated.

Achieving a narrow QRS duration (<135ms) through pacemaker implantation significantly reduces cardiovascular mortality. This finding holds true regardless of a patient

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Device Technology

Background:

  • Traditional right ventricular apex pacing can induce left bundle branch block (LBBB) and heart failure due to QRS widening.
  • Left bundle pacing can improve LBBB patients but may not benefit others.
  • Limited data exists on QRS narrowing benefits across various atrioventricular block types.

Purpose of the Study:

  • To determine if a narrow-paced QRS duration is a significant predictor of mortality in pacemaker recipients.
  • To evaluate the impact of QRS narrowing on survival rates irrespective of pre-existing QRS morphology.

Main Methods:

  • Analysis of 204 patients undergoing pacemaker implantation with lead placement in the septal area.
  • QRS duration assessed using the global QRS method, with 135 ms as the cutoff for narrow QRS.
  • Kaplan-Meier survival analysis to compare mortality between narrow and wide QRS groups.

Main Results:

  • A narrow QRS (<135 ms) was achieved in 68% of patients (140/204).
  • Overall cardiovascular mortality was 4.9% (10/204).
  • Significantly lower mortality was observed in the narrow QRS group compared to the wide QRS group.

Conclusions:

  • A narrow-paced QRS duration is an independent factor associated with improved survival rates in pacemaker patients.
  • Septal lead placement aiming for narrow QRS is a safe and effective strategy for reducing mortality.