What does Dr. Madden reveal after Diana's song in Act 1, Scene 10? What treatment does he suggest?

Dr. Madden appears, commenting as he makes a report that Diana has attempted suicide, slashing her wrists and arms. He recommends treatment, including restraint and electroshock therapy. Dan wonders whether that's still practiced, and Madden tells him it's standard practice in cases like Diana's. Dan remains unconvinced.