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. 2022 Sep-Oct;74(5):414-419.
doi: 10.1016/j.ihj.2022.09.003. Epub 2022 Sep 13.

Tissue tracking of segmental strain as a predictor of provoked dynamic left ventricular outflow tract obstruction

Laila Mohammed El Maghawry  1 , Islam Elsayed Shehata  2 , Radwa Muhammad Abdullah Elbelbesy  3 , Mahmoud Abdelaziz Abdelrashid  4 , Shimaa Gamal ZeinElabdeen  5
Affiliations

Tissue tracking of segmental strain as a predictor of provoked dynamic left ventricular outflow tract obstruction

Laila Mohammed El Maghawry et al. Indian Heart J. 2022 Sep-Oct.

Abstract

Background: Left ventricular outflow tract obstruction (LVOTO) is commonly observed in patients with hypertrophic cardiomyopathy (HCM) or left ventricular hypertrophy (LVH). Some patients develop LVOTO provoked by physical exertion, and hence termed dynamic LVOTO (DLVOTO). However, its precise prevalence and mechanism are still unclear.

Aim: Two-dimensional speckle tracking echocardiography (2D STE) seems to be helpful for the detection of early LV structural abnormalities. This study aimed to examine the possible role of segmental as well as global longitudinal strain in identifying DLVOTO non-HCM patients as detected by dobutamine stress echocardiography (DSE).

Methods and results: Two hundred and fifty patients without structural heart disease had undergone conventional transthoracic echocardiography, 2D STE, and DSE. All patients with non-ischemic evidence were divided into two groups according to the DSE results; DLVOTO (+) and DLVOTO (-). Among 250 patients, 50 patients (36%) had shown DLVOTO after DSE (15 males, 35 females; mean age 55±7years). They were compared with 90 non -LVOTO obstruction patients (43 males, 47 females; mean age 57±6years). Based on multivariate logistic regression analysis, the independent predictors of provoked DLVOTO during DSE were resting basal septal longitudinal strain BS-LS average (p < 0.001), resting LA reservoir strain (p < 0.001), and systolic LVOT diameter (p = 0.03). Resting BS-LS average with cut-off - 17.5% was recognized as a critical indicator of DLVOTO, with sensitivity 78%, and specificity 95% (better than systolic LVOT diameter of sensitivity 76%, and specificity 15% and resting LA reservoir strain which showed poor AUC at ROC curve 0.007).

Conclusion: We demonstrate that provoked LVOTO during DSE in non HCM symptomatic patients is directly correlated to resting regional LS, where the increased BS-LS of ≥ -17.5% was a key determinant of LVOT gradient provocation. Assessment of baseline BS-LS average might be a bedside simple tool for detection of patients with DLVOTO not able to do DSE.

Keywords: DLVOTO; Dobutamine stress echo; Global longitudinal strain; Speckle tracking.

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Conflict of interest statement

Declaration of competing interest There is no conflict of interest.

Figures

Fig. 1
Fig. 1
Segmental Longitudinal strain at apical 4- chamber view showing high value of segmental strain at basal infero-septum.
Fig. 2
Fig. 2
Segmental Longitudinal strain at apical 3-chamber view showing high segmental strain at basal anteroseptal.
Fig. 3
Fig. 3
Global and segmental left ventricular longitudinal strain assessment from the apical 4, 2, and 3- views.
Fig. 4
Fig. 4
Dynamic LVOTO detected by CW Doppler during DSE.
Fig. 5
Fig. 5
ROC curve of predictors of DLVOTO.
See this image and copyright information in PMC

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