Bunny waveform sign

Last revised by Dr Francis Deng on 02 Jan 2020

Bunny waveform sign refers to the biphasic morphology of the pulsed wave Doppler spectral waveform in the vertebral artery in early (occult/latent or partial) subclavian steal phenomenon (sometimes called a "presteal" state, before it progresses to frank flow reversal). There is a sharp deceleration of flow during peak systole due to a drop in pressure in the stenotic segment of the subclavian artery when flow is fastest 2. Different depictions differ as to whether the bunny is facing to the left 2-7 or right 8,9.

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Case 1
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.