What is angina vs heart failure
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Angina vs Heart Failure
These are two distinct cardiac syndromes with different underlying mechanisms, presentations, and treatments - though they can coexist and one can lead to the other.
Angina Pectoris
What it is
Angina is transient chest discomfort caused by temporary, reversible myocardial ischemia - insufficient blood flow to the heart muscle that does not cause cell death (necrosis). The pain arises from ischemia-triggered release of adenosine, bradykinin, and other molecules that stimulate autonomic nerves. - Robbins, Cotran & Kumar Pathologic Basis of Disease
The three types
| Type | Trigger | Mechanism |
|---|---|---|
| Stable (typical) | Exertion, emotional stress | Fixed atherosclerotic stenosis limits perfusion when demand rises |
| Prinzmetal (variant) | Rest, no predictable trigger | Coronary artery spasm (can affect normal vessels) |
| Unstable (crescendo) | Progressively less exertion or at rest | Plaque rupture + thrombus formation - a medical emergency |
Classic symptoms
- Crushing or squeezing substernal chest pain
- Radiates to the left arm or jaw (referred pain)
- Episodes last 15 seconds to 15 minutes
- Relieved by rest or nitroglycerin (vasodilator)
Note: "Silent ischemia" - painless episodes - is especially common in diabetics and elderly patients, presenting instead as dyspnea, nausea, diaphoresis, or palpitations. - Robbins, Cotran & Kumar
Key point
Angina = ischemia without infarction. The heart muscle is temporarily starved of oxygen but survives. If the ischemia is prolonged or severe enough, it progresses to myocardial infarction (heart attack).
Heart Failure
What it is
Heart failure is a clinical syndrome in which the heart cannot meet the metabolic requirements of the body at normal filling pressures. It is not a single disease but the final common endpoint of many cardiac injuries. - Textbook of Family Medicine, 9e
Two main subtypes
| Subtype | Ejection Fraction | Problem |
|---|---|---|
| HFrEF (reduced EF) | EF < 45-50% | Weak pumping - systolic dysfunction |
| HFpEF (preserved EF) | EF > 45-50% | Stiff heart, impaired filling - diastolic dysfunction |
Both are roughly equally common.
Causes and pathophysiology
Heart failure can be triggered by coronary artery disease (CAD), myocardial infarction, hypertension, valvular disease, diabetes, anemia, alcoholism, and congenital defects. The final pathway involves:
- LV remodeling - the ventricle stretches, dilates, and loses function
- Neurohormonal activation - the renin-angiotensin-aldosterone system (RAAS) and sympathetic nervous system kick in, initially compensatory but ultimately harmful
- Cardiac fibrosis via matrix metalloproteinases (MMPs) and collagen deposition
- Cardiomyocyte apoptosis driven by elevated angiotensin II and catecholamines
Classic symptoms
- Dyspnea (shortness of breath), especially on exertion
- Orthopnea (can't lie flat), paroxysmal nocturnal dyspnea
- Fatigue and reduced exercise capacity
- Fluid retention: peripheral edema, pulmonary congestion
- Note: not all HF patients have obvious fluid overload - this is why "heart failure" is preferred over "congestive heart failure"
Prognosis
Mortality remains approximately 50% within 5 years of diagnosis. Annual US costs have exceeded $39 billion.
Side-by-Side Comparison
| Feature | Angina | Heart Failure |
|---|---|---|
| Core problem | Temporary ischemia (inadequate O2 supply) | Pump failure (inadequate cardiac output) |
| Cell death? | No - reversible | No (in HF itself), but often caused by prior infarction |
| Main symptom | Chest pain/pressure | Dyspnea, fatigue, edema |
| Duration of symptoms | Minutes (episodic) | Chronic, progressive |
| Precipitating cause | Atherosclerosis, spasm | CAD, MI, HTN, valvular disease, many others |
| Reversible? | Yes, with rest or nitrates | Partially, with treatment (remodeling can reverse) |
| Key biomarker | None in stable angina (troponin elevated in unstable) | BNP/NT-proBNP elevated |
| Acute treatment | Nitroglycerin, rest, beta-blockers | Diuretics, ACE inhibitors/ARBs, beta-blockers |
| Chronic treatment | Statins, antiplatelets, revascularization | ACEi/ARBs, beta-blockers, MRAs, SGLT2 inhibitors, ARNIs |
How They Relate
Angina and heart failure are linked on a continuum of ischemic heart disease:
- Repeated episodes of ischemia (angina) can impair myocardial function over time
- A myocardial infarction (the severe end of unstable angina) is the most common cause of heart failure
- A patient can have both: angina from ongoing ischemia AND heart failure from prior infarction
The key distinction: angina is about blood supply to the heart muscle (ischemia), while heart failure is about the heart muscle's ability to pump (failure of cardiac output).
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