DSA examination is digital subtraction, usually applied in gynecology for interventional treatment, hemostasis or uterine fibroid pain relief, which can give the blood vessels to the radiology technique of manifestation, thus observing the blood vessels that need to be blocked within the image, using the corresponding substance for compression and blocking the flow of blood. No matter in which department, the application of DSA has a role, also used in gynecology for postpartum hemorrhage, the application is also more widespread, as follows: 1, fibroids: block the blood supply to the fibroids, thus inhibiting the growth of fibroids, belongs to a treatment method; 2, myometrium: usually patients have a lot of pain, in addition to the removal of the uterus, can also be used digital imaging technology that DSA, to identify the supply vessels, the blood vessels The blood supply disappears by blocking it with a special substance, which makes it gradually shrink.