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Related Concept Videos

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Idiopathic Ventricular Arrhythmia Ablation Using Non-Fluoroscopic Catheter Visualization System.

Akiko Ueda1, Kyoko Soejima2, Yosuke Miwa2

  • 1Division of Advanced Arrhythmia Management, Kyorin University Hospital.

International Heart Journal
|November 23, 2018
PubMed
Summary

A new non-fluoroscopic catheter visualization (NFCV) system significantly reduces fluoroscopy time during catheter ablation for premature ventricular contractions/ventricular tachycardia (PVC/VT) without compromising safety or effectiveness.

Keywords:
Idiopathic premature ventricular contractionIdiopathic ventricular tachycardiaMediGuideRadiation exposure

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Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
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Area of Science:

  • Cardiology
  • Medical Imaging
  • Electrophysiology

Background:

  • Catheter ablation is a key treatment for idiopathic premature ventricular contractions/ventricular tachycardia (i-PVC/VT).
  • Fluoroscopy is traditionally used for catheter visualization during these procedures, posing radiation risks.
  • Novel visualization systems aim to reduce fluoroscopy exposure while maintaining procedural accuracy.

Purpose of the Study:

  • To evaluate the effectiveness and safety of a novel sensor-based, electromagnetic, non-fluoroscopic catheter visualization (NFCV) system.
  • To compare procedural outcomes of i-PVC/VT ablation using NFCV versus conventional fluoroscopy (CvF).

Main Methods:

  • 30 i-PVC/VT ablation procedures were performed using the NFCV system combined with a 3D electroanatomic mapping system (3D-EMS).
  • Pre-acquired cine loops were used for catheter tracking and guidance.
  • Procedural parameters were compared with historical data from i-PVC/VT ablations using CvF.

Main Results:

  • Successful i-PVC/VT elimination rates were comparable between NFCV (87%) and CvF (84%) groups (P=1.000).
  • Total fluoroscopy time was significantly reduced with NFCV (3.3 min) compared to CvF (16.6 min) (P<0.001).
  • Procedure times were similar (119.8 min for NFCV vs. 125.0 min for CvF, P=0.868), and no major complications occurred in the NFCV group.

Conclusions:

  • The NFCV system is safe and feasible for i-PVC/VT mapping and ablation when used with 3D-EMS.
  • NFCV significantly decreases fluoroscopy time, offering a safer alternative to conventional fluoroscopy for i-PVC/VT ablation.