Rong Wang, Haiming Zhuang, Nan Xu, Li Zhang, Jiayi Xing, Tingting Zhang, Lianming Kang, Lei Song, Kunjing Pang
{"title":"Systolic Dyssynchrony Index in Hypertrophic Cardiomyopathy: Association With Ventricular Arrhythmias and Risk Prediction.","authors":"Rong Wang, Haiming Zhuang, Nan Xu, Li Zhang, Jiayi Xing, Tingting Zhang, Lianming Kang, Lei Song, Kunjing Pang","doi":"10.1016/j.jacasi.2025.05.002","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>Mechanical dispersion (MD) has been demonstrated to be associated with nonsustained ventricular tachycardia (NSVT) and could potentially predict sudden cardiac death in hypertrophic cardiomyopathy (HCM) patients.</p><p><strong>Objectives: </strong>The authors sought to evaluate the systolic dyssynchrony index (SDI) measured with 3-dimensional echocardiography and explore its predictive value for risk assessment in HCM patients.</p><p><strong>Methods: </strong>A total of 610 HCM patients were prospectively enrolled, and we measured the MD and SDI. Their associations with NSVT and guideline-based implantable cardioverter-defibrillator class of recommendation (ICD-COR) were analyzed.</p><p><strong>Results: </strong>A total of 81 (13.28%) patients were diagnosed with NSVT by the 24-hour Holter monitoring. The SDI of HCM patients with NSVT was significantly higher than that of HCM patients without NSVT (8.60% (7.00%-10.80%) vs. 6.00% (4.70%-7.15%). P = 0.000). The SDI was independently associated with the presence of NSVT (OR: 1.57; P = 0.000). The SDI identified NSVT in HCM patients with an area under the curve of 0.79 at a cutoff value of 7.58%, which was significantly higher than MD, with an area under the curve of 0.70 (P = 0.025). The percentages for class IIa ICD-COR in HCM patients with SDI ≥7.58% were significantly higher than those in HCM patients with SDI <7.58% according the current guidelines.</p><p><strong>Conclusions: </strong>The SDI was more capable of assessing mechanical dyssynchrony and detecting NSVT in HCM patients compared with MD. The SDI might serve to identify HCM patients eligible for class IIa ICD-COR according to current guidelines.</p>","PeriodicalId":73529,"journal":{"name":"JACC. Asia","volume":" ","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JACC. Asia","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1016/j.jacasi.2025.05.002","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Background: Mechanical dispersion (MD) has been demonstrated to be associated with nonsustained ventricular tachycardia (NSVT) and could potentially predict sudden cardiac death in hypertrophic cardiomyopathy (HCM) patients.
Objectives: The authors sought to evaluate the systolic dyssynchrony index (SDI) measured with 3-dimensional echocardiography and explore its predictive value for risk assessment in HCM patients.
Methods: A total of 610 HCM patients were prospectively enrolled, and we measured the MD and SDI. Their associations with NSVT and guideline-based implantable cardioverter-defibrillator class of recommendation (ICD-COR) were analyzed.
Results: A total of 81 (13.28%) patients were diagnosed with NSVT by the 24-hour Holter monitoring. The SDI of HCM patients with NSVT was significantly higher than that of HCM patients without NSVT (8.60% (7.00%-10.80%) vs. 6.00% (4.70%-7.15%). P = 0.000). The SDI was independently associated with the presence of NSVT (OR: 1.57; P = 0.000). The SDI identified NSVT in HCM patients with an area under the curve of 0.79 at a cutoff value of 7.58%, which was significantly higher than MD, with an area under the curve of 0.70 (P = 0.025). The percentages for class IIa ICD-COR in HCM patients with SDI ≥7.58% were significantly higher than those in HCM patients with SDI <7.58% according the current guidelines.
Conclusions: The SDI was more capable of assessing mechanical dyssynchrony and detecting NSVT in HCM patients compared with MD. The SDI might serve to identify HCM patients eligible for class IIa ICD-COR according to current guidelines.