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Table 3 Intra- and Inter-observer measurement variability for layer-specific two-dimensional speckle-tracking echocardiography

From: Assessment of myocardial function in obstructive hypertrophic cardiomyopathy cats with and without response to medical treatment by carvedilol

  Intra-observer Inter-observer
SD CV (%) SD CV (%)
 Longitudinal strain
  Whole layer 0.67 4.3 0.85 5.6
  Endocardial layer 0.76 3.9 1.04 6.0
  Epicardial layer 0.73 5.8 0.74 5.8
  Endo/Epi 0.04 3.1 0.02 5.8
 Circumferential strain
  Whole layer 0.68 4.0 1.47 7.8
  Endocardial layer 1.16 3.6 2.21 7.2
  Epicardial layer 0.39 5.2 0.49 5.5
  Endo/Epi 0.25 5.6 0.32 8.1
  1. SD: standard deviation; CV: coefficient of variation; Endo/Epi: endocardial to epicardial ratio.