His areas of expertise include heart problems, hypertension (high blood pressure), and cardiac electrophysiological study. Dr. O'Toole is professionally affiliated with Northwestern Medicine Central DuPage Hospital and DuPage Medical Group (DMG). He attended Loyola University Chicago, Stritch School of Medicine and then went on to complete his residency at a hospital affiliated with the University of Chicago. Aetna EPO, Blue Cross/Blue Shield, and Coventry are among the insurance carriers that Dr. O'Toole accepts. He is accepting new patients.