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Pulsed-wave Doppler interrogation of transmitral (A) (left apical five-chamber view) and transtricuspid (B) (left cranial long-axis view) flow. (A) Transmitral E waves (arrows) consistent with ventricular pacing at 60 beats/minute, and high-frequency, low-amplitude A waves (arrowheads, 600/minute) are apparent. (B) Transtricuspid E (arrows) and A (arrowheads) waves are present, indicating AV dissociation; there is no evidence of fibrillatory conduction.
