Ultrasound treatment for breast engorgement: A randomised double blind trial

The aim of this study was to test the efficacy of thermal ultrasound therapy as a treatment for severe post partum breast engorgement. A randomised double-blind, placebo-controlled trial was conducted on 197 breasts. Two ultrasound machines of identical appearance were used. One was working normally, the other had the crystal replaced with a resistor producing surface heat only. Assessment of effectiveness was subjective, using visual analogue scales for pain and hardness, and objective, using tonometry. Results indicate that both the true and sham machines were effective in reducing subjectively perceived pain and hardness. However, the results of this study show that the effect cannot be attributed to the ultrasound component.