Briefly outline the pathophysiology of angina pectoris. Identify the major drug groups used in the treatment of selected conditions associated with poor perfusion of tissues, such as angina pectoris,...

Briefly outline the pathophysiology of angina pectoris. Identify the major drug groups used in the treatment of selected conditions associated with poor perfusion of tissues, such as angina pectoris, cerebral ischaemia and erectile dysfunction. State the mechanisms of action of the major drug groups.