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The Ultrasound Journal

Table 1 Carotid artery Doppler measures

From: Simultaneous venous–arterial Doppler during preload augmentation: illustrating the Doppler Starling curve

Carotid Doppler measure

ccFT coefficient of variation

Cardiac cycle sample window

Absolute ccFT∆

% ccFT∆

% VTIc∆

Patient 1

3.3%

19 cardiac cycles

− 4.31 ms

− 2.0%

− 26.0%

Patient 2

4.1%

28 cardiac cycles

 + 16.3 ms

 + 5.0%

 + 11.0%

  1. The coefficient of variation is the standard deviation divided by the mean of the baseline section, this was used to determine the number of cardiac cycles in the baseline and intervention periods needed to detect change with statistical confidence. The ccFT∆ and VTIc∆ for patient 2 but not patient 1 are consistent with a clinically significant increase in stroke volume [15, 24]
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