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J. Cardiovasc. Dev. Dis. 2018, 5(3), 41; https://doi.org/10.3390/jcdd5030041

Myocardial Contraction during the Diastolic Isovolumetric Period: Analysis of Longitudinal Strain by Means of Speckle Tracking Echocardiography

1
Department of Cardiology, Hospital Dr Peset, 46017 Valencia, Spain
2
Cardiodiagnosis Department, Medical Research of Buenos Aires, CP 1425 Buenos Aires, Argentina
*
Author to whom correspondence should be addressed.
Received: 17 July 2018 / Revised: 2 August 2018 / Accepted: 4 August 2018 / Published: 9 August 2018
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Abstract

Background: According to the ventricular myocardial band model, the diastolic isovolumetric period is a contraction phenomenon. Our objective was to employ speckle-tracking echocardiography (STE) to analyze myocardial deformation of the left ventricle (LV) and to confirm if it supports the myocardial band model. Methods: This was a prospective observational study in which 90 healthy volunteers were recruited. We evaluated different types of postsystolic shortening (PSS) from an LV longitudinal strain study. Duration of latest deformation (LD) was calculated as the time from the start of the QRS complex of the ECG to the latest longitudinal deformation peak in the 18 segments of the LV. Results: The mean age of our subjects was 50.3 ± 11.1 years. PSS was observed in 48.4% of the 1620 LV segments studied (19.8%, 13.5%, and 15.1% in the basal, medial, and apical regions, respectively). PSS was more frequent in the basal, medial septal, and apical anteroseptal segments (>50%). LD peaked in the interventricular septum and in the basal segments of the LV. Conclusions: The pattern of PSS and LD revealed by STE suggests there is contraction in the postsystolic phase of the cardiac cycle. The anatomical location of the segments in which this contraction is most frequently observed corresponds to the main path of the ascending component of the myocardial band. This contraction can be attributed to the protodiastolic untwisting of the LV. View Full-Text
Keywords: helical ventricular myocardial band; diastolic contraction; longitudinal strain; ventricular torsion; speckle-tracking echocardiography helical ventricular myocardial band; diastolic contraction; longitudinal strain; ventricular torsion; speckle-tracking echocardiography
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Mora, V.; Roldán, I.; Romero, E.; Saurí, A.; Romero, D.; Pérez-Gozalbo, J.; Ugalde, N.; Bertolín, J.; Rodriguez-Israel, M.; Delgado, C. .-O.; Lowenstein, J.A. Myocardial Contraction during the Diastolic Isovolumetric Period: Analysis of Longitudinal Strain by Means of Speckle Tracking Echocardiography. J. Cardiovasc. Dev. Dis. 2018, 5, 41.

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