How do I verify the department and service information when trying to book an appointment through a heart disease website?

First check whether the website clearly lists the name of the medical institution, the visit address, the department, and the appointment contact information, then confirm through verifiable official channels of that institution. When making an appointment, you can provide your existing diagnosis and main purpose of visit, and ask about the appropriate department, required documents, and whether the target service is provided. Do not assume the website's qualifications or diagnostic and treatment capabilities based solely on its name; if emergency assistance is needed, contact local emergency services directly and do not wait for a website reply.