Key result
A 12-segment 2DSTE model shows ~88% feasibility, revealing higher 2-chamber versus 4-chamber RV strain.
Observational (n=70)
p-value: p=<.001
A novel 12-segment 2DSTE model for assessing right ventricular function is feasible and demonstrates that 2-chamber and 4-chamber views provide complementary rather than redundant information.
12-segment RV strain model feasible in normals; leaves open superiority and clinical adoption pending validation.
BACKGROUND: 2D speckle tracking echocardiography (2DSTE) was proved to be accurate for the assessment of the RV function. However, normal values for RV strain refer mostly to 3- or 6-segment models, excluding the contribution of other RV walls to RV function. We analyze RV function by 2DSTE in a normal population, using parasternal two-(2C) and apical four-chamber (4C) RV views, and creating a new 12-segment model for a potential better definition of RV function. METHODS: We prospectively evaluated 100 normals using 2DE and STE. We assessed the RV systolic function from regional strain (basal, mid, and apical), and at the level of each wall: lateral (LS), septal (SS), inferior (IS), and anterior (AS), and also global strain for 4C (4CGS), and 2C (2CGS). Global systolic strain rate (SRs) was measured from 2C and 4C views. Diastolic function was assessed from early (SRe) and late global strain rate (SRl), for both views. RESULTS: A total of 70 healthy individuals (48±15 years, 34 men) were suitable for concomitant 4C and 2CRV analysis. Feasibility of the STE analysis was 87.8%. We found significantly lower SS by comparison with LS, AS, and IS (P<.001). All S/SR parameters (GS, SRs, and SRe) were higher in 2C view than in 4C view (P<.001). All systolic S/SR parameters did not change with age. The early diastolic SR decreased, while the late diastolic SR increased with age. CONCLUSION: Our 12-segment RV strain model is feasible. Moreover, 2DSTE analysis using 2C and 4C views of the RV does not provide similar information. Rather, they offer complementary data. This might be of particularly clinical interest in diseases with regional RV dysfunction.
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Rimbaş et al. (2016) conducted an observational in Healthy individuals (n=70). 12-segment 2D speckle tracking echocardiography was evaluated on Right ventricular strain and strain rate parameters (p=<.001). A 12-segment 2D speckle tracking echocardiography model was feasible in 87.8% of healthy individuals, revealing higher strain parameters in the 2-chamber versus 4-chamber view (P<0.001).
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