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. 2016 Jul 12;32(3):326–332. doi: 10.1007/s00380-016-0871-5

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — The intensity of left atrial spontaneous echo contrast (SEC) was classified into four grades, from 0 to 3. Grade 0 was no SEC (a), grade 1 mild (b), grade 2 moderate (c) and grade 3 severe (d)