______ is defined as chest pain caused by ischemia or lack of oxygen. A. Angina B. Acute coronary syndrome C. Aneurism D. InfarctionAugust 10, 2020/in Health and Mendical /by Joseph______ is defined as chest pain caused by ischemia or lack of oxygen. A. Angina B. Acute coronary syndrome C. Aneurism D. Infarction.