There two main classes of surgery
• Major – Major surgeries are usually extensive and warrant an overnight or extended stay in a hospital. These surgeries include extensive work such as entering a body cavity, removing an organ or altering the body’s anatomy. Patients undergoing major surgeries usually require anesthesia or respiratory assistance and sometimes even both. Examples of major surgery include cardiac operations, any bowel cavity operations, reconstructive surgery, deep tissue procedures, any transplant procedures, as well as any surgeries in the abdomen, chest or cranium.