Before any surgery, anaesthesia is given by the anaesthesiologist, who are especially trained in anaesthesia pain management, to relive any pain or sensation whilst surgery. The anaesthesiologist reviews the medical condition of the patient before giving the anaesthesia. They also look in to the previous reaction to the anaesthesia, if given before. Type and amount of anaesthesia treatment given to the patient depends on the type of surgery and the medical condition of the patient. There are different types of anaesthesia like local anaesthesia and regional anaesthesia. Local anaesthesia is given to temporarily stop the sense of pain during a minor surgery. Patient may be conscious during the surgery and it may be given through the injection. Regional anaesthesia is given to numb a larger part of body while performing a surgery. General anaesthesia is passed though breathing mask to keep the patient unconscious during the entire surgery. Cardiologists use anaesthesia while performing open heart surgery, lung surgery and other operations. Anaesthesia monitoring is an important part of the surgery. Step by step and second by second observation is done. The slightest change in the behaviour of body gives the anaesthesiologist ample amount of information about patient's body. In addition to maintaining and monitoring anaesthesia level, anaesthesiologist also monitors heart rate, blood pressure, heart rhythm, body temperature and breathing. Sophisticated technology is now used in anaesthesia monitoring to maintain body's response.