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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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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.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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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...
160
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
868
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

3.8K
An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
3.8K
Electrocardiogram01:29

Electrocardiogram

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An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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Video Experimental Relacionado

Updated: Sep 9, 2025

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
08:10

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation

Published on: July 20, 2022

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Marco bayesiano para la estimación de la LAT auricular en ECGI

Carlos Fambuena-Santos, Clara Herrero, Santiago Ros

    IEEE transactions on medical imaging
    |August 29, 2025
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Un nuevo marco bayesiano estima con precisión la actividad eléctrica cardíaca utilizando imágenes electrocardiográficas no invasivas (ECGI). Este método supera a las técnicas tradicionales, reduciendo los artefactos y mejorando el mapeo de las arritmias.

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    Área de la Ciencia:

    • Cardiología
    • Ingeniería biomédica
    • Biología computacional

    Sus antecedentes:

    • El mapeo del tiempo de activación local (LAT) proporciona información crucial sobre la propagación eléctrica cardíaca.
    • Los métodos tradicionales de estimación de LAT que utilizan sistemas invasivos crean artefactos cuando se aplican a señales ECGI no invasivas.
    • Los métodos no invasivos existentes como -dV/dt y el gradiente espacio-temporal (STG) tienen limitaciones en la precisión y la generación de artefactos.

    Objetivo del estudio:

    • Introducir y evaluar un nuevo marco bayesiano para la estimación de los LAT a partir de las señales ECGI.
    • Comparar el rendimiento del marco bayesiano con los métodos tradicionales -dV/dt y STG.
    • Evaluar la capacidad del marco para mapear con precisión la actividad eléctrica cardíaca e identificar líneas de bloqueo (LoB) sin artefactos.

    Principales métodos:

    • Desarrollo de un nuevo marco bayesiano para la estimación de la LAT utilizando datos del ECGI.
    • Validación mediante modelos de aceleración en silicio con niveles de ruido variables.
    • Evaluación clínica en dos pacientes: uno en el ritmo sinusal y otro con ablación del istmo cavotricuspidal (ICC) durante el pacing.

    Principales resultados:

    • El enfoque bayesiano logró coeficientes de correlación de Pearson >0,91 en simulaciones, superando significativamente a -dV/dt (0,75-0,81) y STG (0,78-0,86) en todos los niveles de ruido.
    • Reducción del error en la identificación de los primeros y últimos sitios de activación hasta en 0,8 cm en condiciones de bajo ruido.
    • Clínicamente, el marco bayesiano identificó con precisión el LoB real y redujo el LoB artificial en un promedio de 1% en los datos de simulación.

    Conclusiones:

    • El nuevo marco bayesiano ofrece un avance significativo para la estimación no invasiva de LAT utilizando ECGI.
    • Este método proporciona un mapeo cardíaco preciso y libre de artefactos, superando las técnicas convencionales.
    • Representa una alternativa prometedora para el mapeo eficiente y preciso de las arritmias cardíacas.