Patients with chronic diseases can undergo a facelift provided they are physiologically stable. Generally the plastic surgeon will confer with your physician. The same applies for breast augmentation.
It is possible to undergo a facelift even in a setting of some chronic medical conditions. Your plastic surgeon will need to discuss your proposed surgery and anesthesia with your medical doctor to properly assess and prepare you for the surgery. With proper preparation and proper surgical plan your facelift can be performed with reasonable risk profile.