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. 2020 Jan;10(1):15–25. doi: 10.21037/qims.2019.09.19

Figure 1.

Figure 1

Non-invasive left ventricular pressure-strain loop, myocardial work and myocardial efficiency. (A) Illustration of the non-invasive left ventricular pressure-strain loop. The area within the pressure-strain loop represents the global myocardial work index (%*mmHg). I, mitral valve opening; II, mitral valve closure; III, aortic valve opening; IV, aortic valve closure; I–II, diastolic filling; II–III, isovolumic contraction; III–IV, ejection; IV–I, isovolumic relaxation. (B) Illustration of the global myocardial work efficiency (%) for single left ventricular segments. (C) Illustration of the left ventricular global constructive- and global wasted work (%*mmHg). ANT_SEPT, anteroseptal segment; SEPT, septal segment; ANT, anterior segment; INF, inferior segment; LAT, lateral segment; POST, posterior segment.