Nicolosi Gian Luigi
Department of Cardiology, Policlinico San Giorgio, Italy.
Arch Med Sci Atheroscler Dis. 2020 Dec 26;5:e297-e305. doi: 10.5114/amsad.2020.103032. eCollection 2020.
Almost two decades ago strain and strain rate imaging were proposed as a new, potentially more sensitive modality for quantifying both regional and global myocardial function. Until now, however, strain and strain rate imaging have been slow to be incorporated into everyday clinical practice. More recently, two dimensional strain has been claimed as of greater clinical utility, given that it is angle independent, with improved feasibility and reproducibility as compared to tissue Doppler strain. Nevertheless, speckle tracking strain is reliant on 2D image quality and frame rates. Three dimensional speckle tracking could eliminate the problem of through-plane motion inherent in 2D imaging, but 3D strain is currently limited by low frame rates. Another limitation of strain imaging is that the results are dependent on the ultrasound machine on which analyses are performed, with variability in measurements between different vendors. Despite the diagnostic and prognostic advantages of 2D strain, there is a lack of specific therapeutic interventions based on strain and a paucity of long-term large-scale randomized trial evidence on cardiovascular outcomes. After overabundant literature the same definition of normal cut-off values is controversial and not univocal. Further studies are needed, involving both manufacturers and medical professionals, on the additive contribution, possibly different case by case, of interfering and artifactual factors, aside from myocardial function per se. These artifactual determinants and motion artifacts components could be dominant in individual cases and should always be taken into account in the clinical decision making process in a single case.
近二十年前,应变和应变率成像被提出作为一种新的、可能更敏感的量化局部和整体心肌功能的方法。然而,直到现在,应变和应变率成像在日常临床实践中的应用进展缓慢。最近,二维应变被认为具有更大的临床实用性,因为它不受角度影响,与组织多普勒应变相比,其可行性和可重复性有所提高。尽管如此,散斑追踪应变依赖于二维图像质量和帧率。三维散斑追踪可以消除二维成像中固有的平面外运动问题,但目前三维应变受低帧率限制。应变成像的另一个局限性是结果取决于进行分析的超声设备,不同厂商之间的测量存在差异。尽管二维应变在诊断和预后方面具有优势,但缺乏基于应变的具体治疗干预措施,且关于心血管结局的长期大规模随机试验证据也很少。在大量文献之后,正常截断值的相同定义存在争议且不明确。除了心肌功能本身之外,还需要制造商和医学专业人员进行进一步研究,探讨干扰因素和伪像因素可能因情况而异的附加贡献。这些伪像决定因素和运动伪像成分在个别情况下可能占主导地位,在单个病例的临床决策过程中应始终予以考虑。
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