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Comparative Analysis of Volume Measurement Techniques in Dogs

This study compares stroke volume measurements in dogs using conductance catheter, aortic flow probe, and esophageal Doppler, evaluating their accuracy and precision.

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Comparative Analysis of Volume Measurement Techniques in Dogs

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  1. LV Volume by Conductance Catheter 80 75 Volume (mL) 70 65 60 0 0 0 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 6 6 7 7 7 Time (sec) 8 8 8 9 9 9 10 10 10 11 11 11 17 16 15 Stroke Volume (ml) 14 Aortic Flow Probe 13 0 1 2 3 4 5 6 7 8 9 10 11 Time (sec) 200 150 100 Flow (ml/sec) 50 0 Time (sec) Effect of IVC Occlusions on Measured Variables Dog 6-11 Esophageal Doppler Aortic Velocity 200 160 120 Velocity (cm/sec) 80 40 0 Time (sec) PCCO SV

  2. Conductance Catheter vs. Aortic Flow Probe Dog 4-20 160 140 120 100 Stroke Volume CC (ml) 80 60 r2= 0.94 40 20 0 102 103 104 105 106 Stroke Volume AFP (ml) Dog 6-11 120 100 (ml) 80 60 Stroke Volume CC 40 r2= 0.96 20 0 64 65 66 67 68 (ml) Stroke Volume AFP Dog 6-12 160 120 Stroke Volume CC (ml) 80 r2= 0.97 40 0 58 60 62 64 66 68 70 Stroke Volume AFP (ml)

  3. Bland-Altman Analysis: Aortic Flow Probe vs. Esophageal Doppler Monitor 10 Baseline Pre Norepinephrine 8 Norepinephrine Pre Nipride 6 Nipride Pre Dobutamine Dobutamine 4 (Esophageal Doppler Momitor-Aortic Flow Probe) 2 0 5 7 9 11 13 15 17 19 21 23 25 -2 -4 (Esophageal Doppler Monitor+Aortic Flow Probe)/2

  4. Bland-Altman Analysis: PCCO vs. Aortic Flow Probe 10 Baseline Pre Norepinephrine 8 Norepinephrine Pre Nipride 6 Nipride Pre Dobutamine 4 Dobutamine (PCCO-Aortic Flow Probe) 2 0 5 7 9 11 13 15 17 19 21 23 25 -2 -4 (PCCO+Aortic Flow Probe)/2

  5. Precision Bias Plot of PCCO Stroke Volume and AFP Stroke Volume Precision Bias Plot of EDM Stroke Volume and AFP Stroke Volume

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