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Organized by
Nanjing Heart Center
Asian Bifurcation Club (ABC)
Nanjing First Hospital, Nanjing Medical University
Co-organized by
Chinese Society of Cardiology (CSC)
Capacity Building and Continuing Education Center,National Health and Family Planning Commission (CBCEC)
American Society for Cardiovascular Angiography and Interventions (SCAI)
Asian Heart Society (AHS)
Contact Us
Registration Administration of Domestic Representatives
Hongjuan Peng :
+86-13913895477
Haimei Xu +86-13914736846
cbsnj@cbsmd.cn
Registration Administration of Overseas Representatives
Ling Lin : +86 (25) 52271398
+86-13951884596
cbs@cbsmd.cn
Management of Challenging Cases
Yingying Zhao :+86-13815408517
sub@cbsmd.cn
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210006
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Recommended Paper
Management of Acute Myocardial Infarction During the COVID-19 Pandemic
COVID-19 and Thrombotic or Thromboembolic Disease: Implications for Prevention, Antithrombotic Therapy, and Follow-up
CSC Expert Consensus on Principles of Clinical Management of Patients with Severe Emergent Cardiovascular Diseases during the COVID-19 Epidemic
ACC Clinical Bulletin Focuses on Cardiac Implications of Coronavirus (COVID-19)
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Original Research2017 Aug 22;70(8):942-954.
JOURNAL：J Am Coll Cardiol. Article Link
Stokke TM, Hasselberg NE, Remme EW et al. Keywords: left ventricular geometry; mathematical modeling; myocardial strain
BACKGROUND - Preserved left ventricular (LV) ejection fraction (EF) and reduced myocardial strain are reported in patients with hypertrophic cardiomyopathy, ischemic heart disease, diabetes mellitus, and more.
OBJECTIVES - The authors performed a combined mathematical and echocardiographic study to understand the inconsistencies between EF and strains.
METHODS - An analytical equation showing the relationship between EF and the 4 parameters, global longitudinal strain (GLS), global circumferential strain (GCS), wall thickness, and short-axis diameter, was derived from an elliptical LV model. The equation was validated by measuring the 4 parameters by echocardiography in 100 subjects with EF ranging from 16% to 72% and comparing model-predicted EF with measured EF. The effect of the different parameters on EF was explored in the model and compared with findings in the patients.
RESULTS - Calculated EF had very good agreement with measured EF (r = 0.95). The model showed that GCS contributes more than twice as much to EF than GLS. A significant reduction of GLS could be compensated by a small increase of GCS or wall thickness or reduced diameter. The model further demonstrated how EF can be maintained in ventricles with increased wall thickness or reduced diameter, despite reductions in both longitudinal and circumferential shortening. This was consistent with similar EF in 20 control subjects and 20 hypertrophic cardiomyopathy patients with increased wall thickness and reductions in both circumferential and longitudinal shortening (all p < 0.01).
CONCLUSIONS - Reduced deformation despite preserved EF can be explained through geometric factors. Due to geometric confounders, strain better reflects systolic function in patients with preserved EF.
Copyright © 2017 The Authors. Published by Elsevier Inc. All rights reserved.
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