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Northwest Houston Heart Center The award-winning cardiologists at Northwest Houston Heart Center provide exceptional cardiology care at their offices in Tomball, Cypress, Magnolia, and The Woodlands, Texas. A. Adnan Aslam, MD, FACC, FSCAI, Roy Norman, DO, and Dr. Mac Ansari, MD, lead the highly trained staff and have access to the latest diagnostic tools. The cardiologists at Northwest Houston Heart Center evaluate symptoms such as chest pain, leg pain, shortness of breath, syncope (fainting), and other indicators of cardiovascular disorders using advanced technologies, including electrocardiography (EKG), nuclear stress testing, and cardiac PET (positron emission tomography).