The role also includes preoperative, intraoperative, and postoperative care of the patient. In surgery there are 3 main phases&colon; preoperative, intraoperative and postoperative. A significant correlation is found between the postoperative effect and the stages of preoperative angiograms. These discharges are generally bilaterally synchronous in preoperative patients. Some patients may benefit with preoperative topical minoxidil application and vitamins. Nitrous oxide is supplied to various surgical suites for its anaesthetic functions during preoperative procedures. The patients with total or subtotal block in preoperative myelography achieved the best result. The preoperative imaging allows for accurate examination and evaluation. Preliminary research has shown that preoperative metformin administration can reduce expression of tumor markers. Less common indications include evaluation of lung transplantation, preoperative evaluation, evaluation of right-to-left shunts. Histopathology is indicated if preoperative imaging and/or gross examination gives a suspicion of gallbladder cancer. This effect was very clear in patients with total block in the preoperative myelography. A 2017 JAMA study claims that overall, preoperative symptoms decreased significantly, and visual acuity excelled. Transarterial embolization has become a standard preoperative procedure in the preoperative management. Information obtained during preoperative assessment is used to create a care plan for the patient.