Cor Vasa 2021, 63(6):661-667 | DOI: 10.33678/cor.2021.104

Comparison of left ventricular deformity and twist parameters during Speckle Tracking with Philips iE33 and Affiniti 70 scanners

Denis Anatolyevich Shvets^a, Sergey Vladimirovich Povetkin^b

^a Orel region, "Orel clinical regional hospital", Orel, Russia

^b Kursk State Medical University, Kursk, Russia

Aim: The purpose of this study was to compare the strain and twist parameters measured by Philips scanners with different software using the Speckle Tracking Echocardiography (STE) method. Material and methods of the study: 36 patients with the acute coronary syndrome (ACS) (unstable angina pectoris and myocardial infarction) were investigated on the ultrasonic scanners Philips iE33 (Q-lab, version 7.1, 2009) and Affiniti 70 (aCMQ, 2019) under the same conditions with an interval of 30 min. Scanning and measurement of the primary parameters were performed from the same apical and short-axis sections of the left ventricle (LV). Longitudinal strain (LS), circumferential strain (CS), LV rotation and twist were measured. The consistency of the results was assessed using the Bland-Altman method. Findings: The greatest positive LS relationship was found in the basal segment of the LV inferior wall (r = 0.79; p <0.001). For patients without wall motion abnormalities (WMA) LS when measured with Affiniti 70 scanner they proved to be substantially lower than the normal value for the Philips deformation (-9.1 [-12.5; -8.0] for the front wall and -10.7 [-13.4; -7.8] for the inferior wall LV, r <0.01). The shift in LS values for the anteroseptal wall was 3.1±3.6%, for the inferior wall 1.46±5.8%. Correlation analysis of CS values measured by different scanners did not reveal statistically significant relationships. A moderate positive relationship was found between twist (r = 0.49; p <0.01) and untwist (r = 0.38; p <0.05) of the LV without a statistically significant difference in parameters. The displacement of twist values is 0.14±0.52°/cm, and of untwist is 0.09±0.32°/cm.

Conclusions: The most comparable results when working on the Philips iE33 (Q-lab) and Affiniti 70 (aCMQ) scanners were found for the LS of the basal segment of the inferior, middle segment of the anteroseptal walls, twist and untwist of the left ventricle of the examined patients with ACS. The greatest intra-operator variability in tracking ultrasound grayscale spots with the software of iE33 and Affiniti 70 scanners was found for segmental CS.,

Keywords: Deformation of left ventricle, Speckle tracking echocardiography

Received: April 6, 2021; Revised: July 23, 2021; Accepted: August 25, 2021; Published: December 13, 2021  Show citation