Impact of Atrioventricular Delay Optimization on Ventricular Function in Conduction System Pacing (OPTI-CSP)
The Effect Of Atrioventricular Delay Optimization On Ventricular Functions In Patients Undergoing Conduction System Pacing
Conduction system pacing has emerged as a physiological pacing strategy that preserves ventricular electrical activation and minimizes pacing-induced dyssynchrony. However, the optimal atrioventricular delay setting in patients undergoing conduction system pacing remains uncertain.
This study aims to evaluate the effects of individualized echocardiography-guided atrioventricular delay optimization on ventricular function and hemodynamic performance in patients with conduction system pacing. Echocardiographic parameters including global longitudinal strain, left ventricular ejection fraction, left ventricular outflow tract velocity-time integral, cardiac output, and diastolic function indices will be assessed before and after atrioventricular delay optimization.
The study will investigate whether optimization of atrioventricular timing provides additional mechanical and hemodynamic benefits beyond physiological ventricular activation achieved by conduction system pacing alone.
調査の概要
詳細な説明
Conduction system pacing (CSP), including His bundle pacing and left bundle branch area pacing, has emerged as a physiological pacing strategy capable of preserving ventricular electrical activation and reducing pacing-induced dyssynchrony. Compared with conventional right ventricular pacing, CSP has been associated with improved electrical synchrony, ventricular function, and clinical outcomes.
Despite restoration of physiological ventricular activation, optimal atrioventricular (AV) coupling remains essential for maximizing ventricular filling, stroke volume, and overall cardiac performance. Inadequate AV timing may impair diastolic filling, reduce atrial contribution to ventricular preload, and limit the hemodynamic benefits achieved by physiological pacing. While AV delay optimization has been extensively investigated in cardiac resynchronization therapy, data regarding its role in patients undergoing CSP remain limited.
The present study evaluates the impact of individualized echocardiography-guided AV delay optimization on ventricular mechanical performance and hemodynamic parameters in patients with CSP implanted for atrioventricular block. Comprehensive transthoracic echocardiographic assessment will be performed before and after AV delay optimization. Measurements include left ventricular ejection fraction, global longitudinal strain, left ventricular outflow tract velocity-time integral, cardiac output, chamber dimensions, pulmonary artery systolic pressure, and diastolic function parameters.
The primary objective is to determine the effect of AV delay optimization on global longitudinal strain. Secondary objectives include assessment of changes in left ventricular systolic function, hemodynamic performance, and diastolic parameters. The study aims to provide additional evidence regarding the importance of individualized AV programming in patients undergoing conduction system pacing.
研究の種類
入学 (実際)
段階
- 適用できない
連絡先と場所
研究場所
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Yıldırım
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Bursa、Yıldırım、トルコ（Türkiye）
- University of Health Sciences Bursa Yuksek Ihtisas Training and Research Hospital
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参加基準
適格基準
就学可能な年齢
- 大人
- 高齢者
健康ボランティアの受け入れ
説明
Inclusion Criteria:
- Age between 18 and 80 years
- Permanent conduction system pacing implantation for atrioventricular block
- At least 1 month elapsed since device implantation
- Sinus rhythm at the time of enrollment
- Left ventricular ejection fraction >40%
- Adequate echocardiographic image quality for comprehensive assessment
- Ability and willingness to provide informed consent
Exclusion Criteria:
- Permanent or persistent atrial fibrillation
- Significant valvular heart disease
- Active malignancy
- Severe systemic illness with limited life expectancy
- Sinus node dysfunction requiring alternative pacing strategies
- Inadequate echocardiographic image quality
- Inability to comply with study procedures
- Refusal to participate in the study
研究計画
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：処理
- 割り当て：なし
- 介入モデル：単一グループの割り当て
- マスキング：なし（オープンラベル）
武器と介入
参加者グループ / アーム |
介入・治療 |
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実験的：Echocardiography-Guided AV Delay Optimization
Participants with conduction system pacing undergo individualized echocardiography-guided atrioventricular delay optimization.
Echocardiographic and hemodynamic parameters are assessed before and after optimization.
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Atrioventricular delay settings are individually optimized using echocardiographic assessment of transmitral inflow and ventricular filling patterns.
Device programming is adjusted to achieve optimal atrioventricular coupling and ventricular performance.
他の名前：
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Global Longitudinal Strain (GLS)
時間枠：Immediately before and immediately after atrioventricular delay optimization.
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Assessment of left ventricular global longitudinal strain using two-dimensional speckle tracking echocardiography before and after atrioventricular delay optimization.
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Immediately before and immediately after atrioventricular delay optimization.
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Left Ventricular Outflow Tract Velocity-Time Integral (LVOT VTI)
時間枠：Immediately before and immediately after atrioventricular delay optimization.
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Assessment of forward stroke volume using pulsed-wave Doppler measurements at the left ventricular outflow tract.
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Immediately before and immediately after atrioventricular delay optimization.
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Left Ventricular Ejection Fraction (LVEF)
時間枠：Immediately before and immediately after atrioventricular delay optimization.
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Assessment of left ventricular systolic function using the biplane Simpson method.
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Immediately before and immediately after atrioventricular delay optimization.
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協力者と研究者
捜査官
- スタディチェア：Ahmet Tütüncü、Bursa Yuksek Ihtisas Training and Research Hospital
出版物と役立つリンク
一般刊行物
- Glikson et al. ESC Clinical Consensus Statement on Conduction System Pacing Glikson M, Vijayaraman P, Ellenbogen KA, et al. European Society of Cardiology (ESC) clinical consensus statement on indications for conduction system pacing. Europace. 2025;27(4):euaf050. Coluccia et al. Optimization of the Atrioventricular Delay in Conduction System Pacing Coluccia G, Padeletti L, Della Bella P, et al. Optimization of the atrioventricular delay in conduction system pacing. J Cardiovasc Electrophysiol. 2023;34(6):1441-1451. Pujol-López et al. LEVEL-AT Trial Secondary Findings Pujol-López M, et al. Longitudinal comparison of dyssynchrony correction and strain improvement by conduction system pacing: LEVEL-AT trial secondary findings. Eur Heart J Cardiovasc Imaging. 2024;25(10):1394-1404. Hua et al. Comparison of Left Bundle Branch and His Bundle Pacing Hua W, Fan X, Niu H, et al. Comparison of left bundle branch and His bundle pacing in bradycardia patients. JACC Clin Electrophysiol. 2020;6(10):1291-1299. Sweeney et al. Adverse Effect of Ventricular Pacing Sweeney MO, Hellkamp AS, Ellenbogen KA, et al. Adverse effect of ventricular pacing on heart failure and atrial fibrillation among patients with normal baseline QRS duration. Circulation. 2003;107(23):2932-2937.
研究記録日
主要日程の研究
研究開始 (実際)
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (実際)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
本研究に関する用語
キーワード
その他の研究ID番号
- BYIEAH-CSP-BMU-2025
- 2024-TBEK 2025/07-12 (その他の識別子：SBÜ Bursa Yüksek İhtisas Eğitim ve Araştırma Hastanesi)
個々の参加者データ (IPD) の計画
個々の参加者データ (IPD) を共有する予定はありますか?
医薬品およびデバイス情報、研究文書
米国FDA規制医薬品の研究
米国FDA規制機器製品の研究
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