Q What is DHAL [Doppler Hemorrhoidal
Arterial Ligation]?
Doppler Hemorrhoidal
Arterial Ligation (H.A.L.) is performed using a modified proctoscope in
conjunction with a Doppler ultrasound flow meter. A needle and thread is passed
beneath the artery, and a knot is externally tied, to stop the blood flow to
the hemorrhoid.
