Final answer:
The procedure for a patient with necrosis of the left colon due to mesenteric ischemia is surgical removal of the affected portion of the colon, known as a left hemicolectomy.
Step-by-step explanation:
The procedure for a patient with necrosis of the left colon due to mesenteric ischemia is surgical removal of the affected portion of the colon. This procedure is known as a left hemicolectomy. During a left hemicolectomy, the surgeon removes the necrotic portion of the colon and reattaches the healthy sections. The remaining sections of the colon can then continue to perform their normal functions.