Why do some patients have to see anesthesiologist for consult?

Other health issues. Anesthesiologists are doctors who are trained to manage all your health problems while you have anesthesia and surgery. Severe medical problems, such as heart or lung disease, mean that anesthesia may need to be managed differently. It's best to see the anesthesiologist in advance so that plenty of time is allowed for review of records, discussion of the plan, and answering your questions.
More important. The anesthesiologist is the most important person during surgery. It is important that you review your medical history and discuss an anesthetic plan in advance.