Final answer:
Preoperative screening for CAD involves investigating symptoms such as chest pain, shortness of breath, irregular heartbeat, and more.
Step-by-step explanation:
Preoperative screening for Coronary Artery Disease (CAD) involves identifying symptoms that may indicate the presence of CAD and initiating further investigation. Common symptoms that should initiate investigation include chest pain or discomfort, which may radiate to the shoulder, arm, back, neck, or jaw. Other symptoms include shortness of breath, irregular heartbeat, nausea and vomiting, sweating, anxiety, fainting, and difficulty sleeping. It is important to note that not all symptoms may be present and differential diagnosis is critical.