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関連する概念動画

Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

8.3K
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...
8.3K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

160
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

868
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

3.2K
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...
3.2K

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Updated: Sep 9, 2025

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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ECGIにおける心房LAT推定のためのベイジアンフレームワーク

Carlos Fambuena-Santos, Clara Herrero, Santiago Ros

    IEEE transactions on medical imaging
    |August 29, 2025
    PubMed
    まとめ
    この要約は機械生成です。

    新しいベイジアンフレームワークは,非侵襲的な心電図 (ECGI) を使用して心臓の電気活動を正確に推定します. この方法は従来のテクニックを上回り アーティファクトを減らし,不律のマッピングを改善します

    さらに関連する動画

    Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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    Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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    関連する実験動画

    Last Updated: Sep 9, 2025

    Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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    Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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    Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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    科学分野:

    • 心臓病科
    • 生物医学工学
    • コンピュータ生物学

    背景:

    • 局所活性化時間 (LAT) マッピングは,心臓の電気伝播に関する重要な洞察を提供します.
    • 侵襲的なシステムを用いた従来のLAT推定方法は,非侵襲的なECGI信号に適用されたときに人工物を生み出します.
    • -dV/dtや時空グラデーション (STG) のような既存の非侵襲的な方法は,精度や人工物の生成に制限があります.

    研究 の 目的:

    • ECGI信号からLATを推定するための新しいベイジアンフレームワークを導入し,評価する.
    • ベイジアン・フレームワークの性能を伝統的な -dV/dt および STG 方法と比較する.
    • 心臓の電気活動を正確にマッピングし,アーティファクトなしでブロックライン (LoB) を識別するフレームワークの能力を評価する.

    主な方法:

    • ECGIデータを用いたLAT推定のための新しいベイジアンフレームワークの開発.
    • 異なるノイズレベルを持つインシリコペースモデルによる検証
    • 2人の患者での臨床評価: シヌスリズムで1人,ペーシング中のカボトリクスピッド間隔 (CTI) 後の1人.

    主要な成果:

    • ベイジアンアプローチはシミュレーションでピアーソン相関係数>0.91を達成し,騒音レベルにおいて -dV/dt (0.75-0.81) とSTG (0.78-0.86) を大幅に上回った.
    • 低騒音条件下では,最早と最後の活性化場所の識別の誤差を0.8cmまで減らす.
    • 臨床的に,ベイジアンフレームワークは,シミュレーションデータにおいて,実際のLoBを正確に特定し,人工LoBを平均1%減少させた.

    結論:

    • 新しいベイジアン・フレームワークは,ECGIを用いた非侵襲的なLAT推定に重要な進歩をもたらします.
    • この方法は従来の技術よりも 精密で人工物のない 心臓マッピングを提供します
    • 心拍不全の効率的かつ正確なマッピングのための有望な代替手段です.