2016 ACVIM Forum Research Abstract Program

Six intact hound cross dogs weighing between 19.5-23.8 kg were anesthetized using a standardized protocol and spontaneous ventilation. Each dog underwent MDCT, echocardiography, and TD. Dogs were randomized to the order of MDCT and echocardiography, and TD was performed last. CO using TD was measured in triplicate with <10% variation and minimal changes in heart rate. For imaging methods, CO was calculated by volumetric measurements of SV multiplied by the average heart rate. Echocardiographic left ventricular (LV) end-diastolic volumes (EDV) and end-systolic volumes (ESV) were measured on right long axis 1D images (Teichholz) and right long axis and left apical 2D images (single plane Simpson's method of disks, MOD) on 3 averaged consecutive beats. Real-time 3-dimensional echocardiographic (RT3DE) LV volumes were measured using 3D functional analysis software from both right long axis and left apical imaging planes. MDCT EDV and ESV were measured using specific LV functional analysis software on ECG-gated studies.