Final answer:
The surgical procedure where diseased myocardium is removed and the healthy tissue is reattached is known as Aneurysmectomy, which is particularly relevant after a myocardial infarction.
Step-by-step explanation:
The surgical procedure where an area of diseased myocardium is resected and the remaining healthy tissue is sutured together is called Aneurysmectomy. The myocardium is the thickest layer of the heart and is composed of cardiac muscle cells which are essential for the pumping function of the heart. This procedure is performed when the myocardial tissue is damaged, which can occur after a myocardial infarction (heart attack), wherein there is a complete blockage of the coronary arteries leading to the death of cardiac muscle tissue.