Speckle Tracking Echocardiography Analysis of Left Ventricular Myocardium After Percutaneous Intramyocardial Septal Radiofrequency Ablation for Hypertrophic Obstructive Cardiomyopathy

Study Overview
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Brief Summary
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Objective to investigate the left ventricular (LV) systolic function by speckle tracking echocardiography before and after percutaneous intramyocardial septal radiofrequency ablation for hypertrophic obstructive cardiomyopathy (HOCM). Percutaneous intramyocardial septal radiofrequency ablation (named Liwen Procedure) is a safe and effective treatment approach for HOCM and results in sustained improvement in exercise capacity and persistent in reducing left ventricle outflow tract (LVOT) gradient. However, the systolic function of the myocardial after Liwen procedure in HOCM patients is not well exploration and research. Strain evaluation using speckle tracking echocardiography is an excellent tool for assessing regional and global LV functions. In this study, the investigators aimed to characterize regional and global strain using speckle tracking echocardiography to assess LV radial, circumferential and longitudinal systolic myocardial function in patients with HOCM before and after Liwen procedure.

Official Title
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Left Ventricular Systolic Function After Percutaneous Intramyocardial Septal Radiofrequency Ablation for Hypertrophic Obstructive Cardiomyopathy: a Study Focused on Speckle Tracking Echocardiography

Conditions
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Hypertrophic Obstructive Cardiomyopathy

Intervention / Treatment
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* Procedure: Percutaneous Intramyocardial Septal Radiofrequency Ablation for hypertrophic obstructive cardiomyopathy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with symptoms that limit daily activities (New York Heart Association functional class >II, exercise-induced syncope) despite adequate medical treatment or when medical treatment is not tolerated Patients with a peak LVOT gradient≥50 mm Hg Exclusion Criteria: Those with a peak instantaneous Doppler LVOT gradient of <50 mm Hg Those with an indication for septal reduction therapy and other lesions requiring surgical intervention (e.g., mitral valve repair/replacement and papillary muscle intervention) Those with end-stage heart failure；and those the echocardialology image quality is not clear enough for strain analysis.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Hypertrophic Obstructive Cardiomyopathy<br>Left ventricular systolic function by speckle tracking echocardiography before and after percutaneous intramyocardial septal radiofrequency ablation for hypertrophic obstructive cardiomyopathy. | Procedure: Percutaneous Intramyocardial Septal Radiofrequency Ablation for hypertrophic obstructive cardiomyopathy<br>* Under transthoracic echocardiography (TTE) guidance, the puncture site is positioned at the apex. A guiding line is applied along the septal long axis and the radiofrequency ablation electrode needle(17G, Cool-tip™ RF Ablation System and Switching Controller;Medtronic, Minneapolis, MN, USA) pierced towards the hypertrophic anterior interventricular septum (AIVS) 8-10 mm from the subaortic valve. Each ablation lasts for up to 12 min and the ablation power is gradually increased from 30-40W. Then, the ablation needle is withdrawn 10 mm to prepare for the next application. Overall, 3-4 applications are performed in each patient. The ablation creates an area of thermal coagulative myocardial necrosis that appears as a hyperechogenic reflection detected by TTE. If deemed necessary, we repeat the procedure at the posterior interventricular septum (PIVS).<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Left ventricular systolic function before and after Percutaneous Intramyocardial Septal Radiofrequency Ablation | The left ventricular(LV) systolic function was analyzed by Tomtec Workstation with related software. LV was automatically divided into 16 segments using standard segmentation. The following LV parameters were automatically calculated by the software. The 3D strain indexes derived included ,LV peak systolic global longitudinal strain (GLS,percent), LV peak systolic global radial strain (GRS,percent), LV peak systolic global circumferential strain (GCS,percent) | 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| left ventricular outflow tract gradient before and after Percutaneous Intramyocardial Septal Radiofrequency Ablation | The results were obtained by continuous Doppler echocardiography (mmHg) | 1 year | 
| Interventricular septal thickness before and after Percutaneous Intramyocardial Septal Radiofrequency Ablation | The results were obtained by echocardiography , the unit of mm | 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Cardiomyopathy, hypertrophic, Speckle tracking echocardiography