Module 7: Understanding Chronic Illness and Interventions
Academic and Exam-Oriented Notes: Chronic Illnesses
Coronary Heart Disease (CHD)
1. Definition and Nature Coronary Heart Disease (CHD), also known as coronary artery disease (CAD) or ischemic heart disease, is a condition characterized by the narrowing or blockage of the coronary arteries, which are responsible for supplying oxygen-rich blood to the heart muscle. This narrowing is primarily caused by atherosclerosis, a process where plaques made of fats, cholesterol, calcium, and other substances build up on the artery walls.
There are two main forms of CAD:
Stable ischemic heart disease: A chronic form where arteries gradually narrow over many years, allowing patients to live with the condition day-to-day despite reduced oxygen flow to the heart.
Acute coronary syndrome: A sudden, medical emergency where a plaque ruptures and forms a blood clot, abruptly blocking blood flow and causing a heart attack.
2. Major Symptoms In the early stages, CHD may present no symptoms, but as the arteries continue to narrow, the heart must pump harder, leading to noticeable signs. Major symptoms include:
Chest Pain (Angina): The most common symptom, typically felt as pressure, heaviness, tightness, or squeezing in the middle or left side of the chest. Angina can be stable (triggered by exertion/stress and relieved by rest) or unstable (unpredictable, occurring at rest, indicating a medical emergency). Another less common form is Prinzmetal Angina, caused by temporary artery spasms.
Shortness of Breath (Dyspnea): Difficulty catching one's breath, especially during physical activity, often linked to the heart's inability to pump effectively (heart failure).
Radiating Pain: Discomfort that spreads from the chest to the shoulders, arms (particularly the left arm), back, neck, jaw, teeth, or stomach.
Fatigue and Weakness: Unusual exhaustion caused by the heart failing to meet the body's blood and oxygen needs.
Palpitations: Irregular heartbeats or a racing sensation due to an imbalance in the heart's electrical system.
Additional Signs: Dizziness, lightheadedness, cold sweats, heartburn, and nausea.
Note: Some individuals, particularly women, the elderly, or those with diabetes, may experience atypical or minimal symptoms, such as brief sharp pains or nausea, rather than classic crushing chest pressure. A completely blocked artery results in a heart attack (myocardial infarction), which can be fatal without prompt treatment.
3. Diagnosis Healthcare professionals diagnose CHD through a combination of medical history, physical examinations, and specialized testing.
Medical History & Physical Exam: Assessing risk factors (age, family history, diet, smoking), measuring blood pressure, and listening to the heart with a stethoscope.
Electrocardiogram (ECG/EKG): A painless test using electrodes on the skin to record the heart's electrical activity, helping to detect arrhythmias or previous/current heart attacks.
Stress Testing: Evaluates heart function during physical exertion (usually walking on a treadmill). If a patient cannot exercise, medications are used to simulate stress on the heart.
Echocardiogram: Uses sound waves via a transducer pressed against the chest to create non-invasive images of the heart's structures and pumping function.
Coronary Angiography (Cardiac Catheterization): A procedure where a special contrast dye is injected, and X-rays are taken to visually detect blockages or narrowing within the coronary arteries.
Blood Tests: Used to measure cholesterol levels, blood sugar, and inflammatory markers like high-sensitivity C-reactive protein (hs-CRP). Elevated troponin levels in the blood indicate heart muscle damage from a heart attack.
Imaging Scans: CT coronary angiograms or cardiac MRIs provide detailed images of the heart and blood vessels.
4. Psychological Correlates of CHD CHD is deeply intertwined with psychological factors that influence its onset, progression, and management.
Chronic Stress: Prolonged stress activates the sympathetic nervous system (SNS), releasing hormones like cortisol and adrenaline. This triggers increased blood pressure, heart rate, and chronic inflammation, which accelerates plaque formation (atherosclerosis). Stress also promotes unhealthy coping mechanisms like overeating and smoking.
Depression: Highly prevalent in CHD patients, depression exaggerates the body's stress response and increases inflammation and blood clotting. It is associated with autonomic nervous system (ANS) dysregulation (increased heart rate and decreased heart rate variability). Furthermore, depressed individuals are less likely to adhere to medications, exercise, and healthy diets, worsening their prognosis.
Anxiety: Chronic or generalized anxiety leads to prolonged SNS activation, vascular constriction, and elevated blood pressure. Severe anxiety can cause hyperarousal, palpitations, and potentially trigger cardiac arrhythmias. Conditions like Post-Traumatic Stress Disorder (PTSD) post-heart attack can severely hinder recovery.
Type A Personality: Individuals characterized by high competitiveness, time urgency, and specifically anger and hostility, face a significantly higher CHD risk. Hostility is a strong predictor of heart disease, driving elevated blood pressure, arterial inflammation, and autonomic dysregulation.
Social Isolation vs. Social Support: Loneliness and a lack of close relationships increase chronic stress and inflammatory markers. Conversely, strong social support acts as a buffer against stress, lowers cortisol levels, and encourages healthier lifestyle choices, improving overall outcomes for CHD patients.
Coping Mechanisms & Emotional Trauma: Maladaptive coping (e.g., denial, rumination, substance abuse) increases CHD risk, while active coping (problem-solving, seeking support) lowers it. Additionally, early life emotional trauma or childhood adversity alters the development of the stress-response system, making individuals highly vulnerable to inflammation and cardiovascular disease in adulthood.