what is thd
Transanal hemorrhoidal dearterialization (or THD) is a minimally invasive surgical procedure for the treatment of internal hemorrhoids. It is the procedure of choice in the event that conservative treatment has failed and a patient is still experiencing symptoms from their internal hemorrhoids.inimally Invasive THD Procedure. THD uses a Doppler ultrasound to locate the terminating branches of the hemorrhoidal arteries 2â3 cm above the dentate line. Once the artery is located, the surgeon uses an absorbable suture to ligate or âtie-offâ the arterial blood flow.