2016 ACVIM Forum Research Abstract Program

Excellent correlation was found between CO values measured by TD and 2D MOD (r = 0.98) from the left apical window, as well as 2D MOD (r = 0.90) and RT3DE (r = 0.92) from the right long axis window. A less robust correlation was found between RT3DE values obtained from the left apical window (r = 0.68) and TD. MDCT-derived CO were also strongly correlated (r = 0.80) with TD. CO estimation by Teichholz formula (r = À0.05) had no significant correlation with TD. Bland-Altman analysis showed a systemic underestimation of CO values derived both from echocardiographic and MDCT measurements. The bias for RT3DE CO obtained from the right long axis window was À0.23 L/min (95% confidence interval (CI) À0.56 to 0.09 L/min), and for 2D from the left apical window was À0.66 L/min (95% CI À0.91 to À0.42 L/min). The bias for CO values obtained from MDCT was À0.57 L/min (95% CI À0.99 to À0.15 L/min).