Figure 7From: A new technique for assessing arterial pressure wave forms and central pressure with tissue Doppler Limitations – discordance. Two examples of discordance in the comparison of central pressure obtained by tonometry and TDI. (A) Shows a patient in which the TDI velocities were aliased resulting in a gross underestimation of maximum (systolic) pressure. (B) Shows a patient with excessive movement of the carotid artery during acquisition of the TDI images resulting in artifact in the displacement waveform.Back to article page