You’re in the middle of a submaximal exercise test when your patient reports unusual chest tightness and becomes short of breath. Is this simply deconditioning, or is it a sign of underlying Coronary Artery Disease (CAD)? Knowing how to recognize and respond to this is not just about clinical skill—it’s about patient safety.
What is Coronary Artery Disease?
Coronary Artery Disease (CAD) is a pathological condition where the coronary arteries—the vessels responsible for supplying oxygen-rich blood to the myocardium—become narrowed or blocked. This is typically due to atherosclerosis, the buildup of plaque (fat, cholesterol, and calcium) within the arterial walls. This reduces blood flow, which can lead to ischemia (lack of oxygen to the heart muscle) and, in severe cases, a myocardial infarction (heart attack). It is a cardiovascular condition that directly impacts your patient’s exercise tolerance and overall functional capacity.
Why CAD Matters in Physical Therapy Practice
CAD is a leading cause of morbidity and mortality, and it’s a condition you will see frequently, whether your setting is outpatient orthopedics, acute care, or neuro-rehab. Understanding CAD is critical because it guides your Plan of Care (POC). You must determine the appropriate intensity of exercise, monitor vital signs closely, and recognize red flags that indicate an unstable cardiac status. Your ability to safely prescribe aerobic exercise and functional activities is directly tied to the patient’s cardiovascular reserve and the stability of their CAD.
What You’ll See in the Clinic
Patients with CAD may present with a primary complaint of shortness of breath (SOB) with exertion, unusual fatigue, or referred pain in the chest, jaw, or left arm—symptoms that are often mistaken for musculoskeletal issues. They may also have a history of angioplasty, stent placement, or coronary artery bypass grafting (CABG). It’s essential to monitor their vitals and rate of perceived exertion (RPE) closely.
“Patient presents with a diagnosis of CAD, s/p CABG 3 months ago. Today, patient reports 3/10 exertional dyspnea during 6-minute walk test. HR increased from 70 to 115 bpm, but BP response was blunted (from 120/80 to 130/70). Patient denies chest pain or dizziness. I will progress walking duration by 2 minutes, maintaining an RPE of 11-13 on the Borg Scale.”
Common Pitfall & Pro Tip
⚠️ Pitfall: Assuming a patient is “safe” just because they are status-post a cardiac event. Stopping exercise at the first sign of fatigue is not always enough. You must monitor for the specific signs of exertional intolerance, such as a drop in systolic BP, an irregular pulse, or significant ST-segment changes (if on a monitor).
💡 Pro Tip: Use the talk test and the Borg RPE scale in addition to heart rate. Teach your patient to differentiate between “muscle fatigue” and “cardiac warning signs” like chest pressure, lightheadedness, or nausea. If they experience any of the latter, stop the activity and follow your emergency protocol.
Memory Aid for CAD
Think of “COPD”—not Chronic Obstructive Pulmonary Disease, but Chest Overload, Plaque Deposit. This helps you remember that the core issue is a supply/demand mismatch of oxygen to the heart muscle, which is exacerbated by activity.
NPTE Connection
Expect questions on CAD to test your ability to identify contraindications to exercise (e.g., unstable angina, uncontrolled arrhythmias) and to understand the signs and symptoms of exertional intolerance that require immediate termination of the session.
Related Physical Therapy Concepts
This directly connects to Hypertension and Diabetes Mellitus, which are major risk factors for CAD. Your interventions will also dovetail with principles of Cardiac Rehabilitation, focusing on monitored aerobic exercise, patient education on energy conservation, and lifestyle modification to reduce disease progression and improve functional mobility.
Quick Reference
✓ Key values/findings: Monitor BP (SBP should rise with exercise; a drop >10 mmHg is a red flag), HR, and RPE (11-13/20) ✓ Priority level: Critical – Safety and risk stratification are paramount ✓ PT Interventions/Considerations: • Submaximal aerobic training (walking, cycling) • Vital sign monitoring pre/intra/post exercise • Patient education on red flag symptoms • Energy conservation techniques for ADLs • Phase I cardiac rehab (inpatient)
Ultimately, your role in managing a patient with CAD is to be a vigilant monitor of their cardiovascular response, ensuring that every exercise session is both safe and a step toward greater functional independence.