Abstract
LV torsion during exercise in patients with coronary artery disease (CAD) is not well known. Circumferential strain (CS) and left ventricular (LV) torsion (Tor) have not been evaluated during ischemia in these patients. We aimed to assess the effect of ischemia during exercise echocardiography (ExE) on CS and Tor. We studied a group of 73 patients with true positive ExE results (Ischemic group: ischemia plus an abnormal coronary angiogram) and a matched control group of 66 patients with negative ExE and either normal coronary angiography or low post-test probability of CAD. Basal rotation (Rot) and apical rotation and basal and apical CS were studied by speckle tracking at rest and exercise. Apical CS and apical and basal Rot values were similar between groups at rest, except basal CS which was already worse in the ischemic group. At exercise, all rotational and CS parameters were impaired in the ischemic in comparison with the control group (basal CS: −18 ± 5 vs. −25 ± 7 %, p < 0.001; apical CS: −31 ± 11 vs. − 43 ± 9 %, p < 0.001; time to basal CS: 52 ± 6 vs. 48 ± 7 %, p = 0.001; time to apical CS: 55 ± 7 vs. 49 ± 6 %, p < 0.001; basal rotation: −0.7 ± 6.5° vs. −6.2 ± 8.5°, p < 0.001; LV twist 13.0 ± 10.4° vs.19.7 ± 11.5°, p < 0.001; LV-Tor 1.9 ± 1.6°/cm vs. 2.8 ± 1.7˚/cm, p = 0.001) with the exception of apical rotation which was similar (12.3 ± 7.4° vs. 13.4 ± 7.7°, p = NS). Basal and apical CS and basal rotation impair during exercise-induced ischemia. LV-Tor decreases with ischemia due to worsening of basal rotation, whereas apical rotation does not impair, suggesting the existence of an apical compensatory mechanism.
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Funding
This work has been funded by the Project N RD12/0042/0069, integrated in the National Plan for Scientific Research, Development and Technological Innovation 2008–2011 and by the ISCIII—General Subdirection of Assesment and Promotion of the Research—European Regional Development Fund (FEDER).
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10554_2016_976_MOESM1_ESM.avi
Supplementary material 1. Video 1: Resting (on the top) and exercise (on the bottom) 2-D apical images of a patient with ischemic CAD. Note exercise-induced wall motion abnormalities in the three coronary artery territories. (AVI 8386 KB)
10554_2016_976_MOESM2_ESM.avi
Supplementary material 2. Video 2: Video 2. Resting (on the top) and exercise (on the bottom) 2-D images at the basal (on the left) and apical (on the right) level in the same patient of Video 1. Note how the increase in apical counterclockwise motion at the apex is already visually noticeable. Also, note the increased counterclockwise rotation at the basal level. See also corresponding Figs 3 and 4. (AVI 5556 KB)
10554_2016_976_MOESM3_ESM.avi
Supplementary material 3. Video 3. Resting (on the top) and exercise (on the bottom) 2-D images at the basal (on the left) and apical (on the right) level in another patient with ischemia on the left anterior descending coronary artery territory. Note the increased apical counterclockwise rotation with exercise and how the base of the heart changes from a clockwise to a counterclockwise rotation. See also corresponding Figs 5 and 6. (AVI 6678 KB)
10554_2016_976_MOESM4_ESM.avi
Supplementary material 4. Video 4: Resting (on the top) and exercise (on the bottom) 2-D images at the basal (on the left) and apical (on the right) levels in a patient with a completely normal exercise echocardiography study. See also corresponding Fig 7. (AVI 6972 KB)
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Peteiro, J., Bouzas-Mosquera, A., Broullon, J. et al. Left ventricular torsion and circumferential strain responses to exercise in patients with ischemic coronary artery disease. Int J Cardiovasc Imaging 33, 57–67 (2017). https://doi.org/10.1007/s10554-016-0976-z
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DOI: https://doi.org/10.1007/s10554-016-0976-z