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Table 5 Prediction of volumetric response to CRT with Philips derived echocardiographic images

From: Comparison of strain parameters in dyssynchronous heart failure between speckle tracking echocardiography vendor systems

  Univariate analysis (n = 88) Receiver operating characteristics (n = 88)
Parameter B SD p-value C-statistic Cut-off value
Philips SL-delay 58.897 38.368 0.129 0.564 0.000
TomTec SL-delay −23.910 16.952 0.162 0.569 −0.080
Philips SRSsept 10.072 2.653 <0.001 0.697 0.790
TomTec SRSsept 3.842 0.997 <0.001 0.686 1.180
Philips SSI 7.346 2.257 0.002 0.661 0.830
TomTec SSI 3.860 0.863 <0.001 0.705 2.345
Philips LBBB-type (type 1 or 2 vs. 3) 20.091 5.418 <0.001   
TomTec LBBB-type (type 1 or 2 vs. 3) 22.069 5.122 <0.001   
  1. Prediction of volumetric response to CRT, with results of univariate regression analysis (B, SD and p-value) and receiver operating characteristics (C-statistic, R2 and cut-off). Univariate analyses are based on a change in LVESV on a continuous scale, while receiver operating characteristics are based on a cut-off of ≥15% reduction in LVESV
  2. Philips Philips QLAB, TomTec TomTec 2DCPA, B beta coefficient, SD standard deviation, SL-delay septal-to-lateral wall delay, SRSsept septal systolic rebound stretch, SSI systolic stretch index, LBBB-type septal strain pattern categorization according to Leenders et al