title: Repeatability and reproducibility of right ventricular Tei index valves derived from three echocardiographic methods for evaluation of cardiac function in dogs.
abstract: OBJECTIVE To evaluate repeatability and reproducibility of right ventricular Tei index (RTX) values derived from dual pulsed-wave Doppler, conventional pulsed-wave Doppler, and tissue Doppler echocardiography and to investigate relationships and repeatability among the 3 methods in healthy dogs. ANIMALS 6 healthy adult Beagles. PROCEDURE Echocardiography was performed on each dog on different days for 2 weeks (3 times/d) by 2 echocardiographers. Intraobserver within- and between-day and interobserver coefficients of variation (CVs) and intraclass correlation coefficients (ICCs) for RTXs derived from dual pulse-waved Doppler (RTXDPD), conventional pulsed-wave Doppler (RTXPD), and tissue Doppler (RTXTD) methods were determined. Degrees of agreement among RTX values derived from the 3 methods were assessed by modified Bland-Altman analysis. RESULTS Least squares mean (95% confidence interval) RTXtd was 0.50 (0.46 to 0.54), which was significantly higher than that for RTXDPD (0.27 [0.23 to 0.31]) and RTXPD (0.25 [0.21 to 0.29]). Agreement between RTXDPD and RTXPD was good (bias [mean difference], 0.04 [95% confidence interval, -0.03 to 0.10]). The RTXdpd had high within-day (CV, 6.1; ICC, 0.77) and interobserver (CV, 3.5; ICC, 0.83) repeatability, but between-day repeatability was not high. The RTXtd had high within-day repeatability (CV, 6.0; ICC, 0.80), but between-day and interobserver repeatability were not high. Within-day, between-day, and interobserver repeatability of RTXPD were not high. CONCLUSIONS AND CLINICAL RELEVANCE RTXdpd measurement was a repeatable and reproducible method of cardiac evaluation in healthy dogs. The RTXTD values were significantly higher than the RTXDPD and RTXPD values; therefore, RTX values derived from different echocardiographic methods should be interpreted with caution.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Morita
authors.forename: Kensuke
authors.initials: K
authors.lastname: Nakamura
authors.forename: Tatsuyuki
authors.initials: T
authors.lastname: Osuga
authors.forename: Sue Yee
authors.initials: SY
authors.lastname: Lim
authors.forename: Nozomu
authors.initials: N
authors.lastname: Yokoyama
authors.forename: Keitaro
authors.initials: K
authors.lastname: Morishita
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ohta
authors.forename: Mitsuyoshi
authors.initials: M
authors.lastname: Takiguchi
mesh_terms: D000818:Animals; D001783:Blood Flow Velocity; D004285:Dogs / Q000502:physiology*; D004452:Echocardiography / Q000379:methods / Q000662:veterinary*; D015150:Echocardiography, Doppler / Q000662:veterinary; D005260:Female; D006321:Heart; D006339:Heart Rate; D006352:Heart Ventricles; D008297:Male; D015203:Reproducibility of Results