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Fig. 15A. —Superimposed cyclic flow perturbations in common carotid
artery because of presence of intraaortic balloon pump. Doppler sonogram shows
55-year-old man with ischemic cardiomyopathy. Waveforms in right common
carotid artery show second peak of forward flow (arrow) during
systole corresponding to inflation of intraaortic balloon. At end of diastole,
and immediately preceding next beat, there is transient reversal
(arrowhead) that corresponds to deflation of balloon.
