Prevention & care
Coronary disease: arteries, angina, tests, stents, and evidence limits
On this page
Coronary heart disease affects the vessels supplying blood to the heart muscle. Plaque can narrow the larger arteries, while disease can also involve arteries without a major obstruction or the smaller vessels. Reduced supply can cause ischemia: the heart muscle receives too little oxygen for its needs.[1]
Related words describe different parts of the problem
| Term | Meaning |
|---|---|
| Coronary arteries | Blood vessels supplying the heart muscle.[1] |
| Obstructive or nonobstructive disease | Larger-artery disease with or without substantial narrowing; the labels do not cover every small-vessel problem.[1] |
| Microvascular disease | Problems involving the smaller vessels supplying the heart.[1] |
| Angina | Chest discomfort associated with insufficient oxygen supply; different patterns have different causes and urgency.[3] |
| Heart attack versus cardiac arrest | A heart attack concerns interrupted supply and heart-muscle injury; cardiac arrest is a sudden loss of effective heart function.[7] |
Angina is not one uniform pattern
| Pattern | What distinguishes it |
|---|---|
| Stable | A familiar, more predictable pattern, often associated with exertion. A change in that pattern needs assessment.[3] |
| Unstable | New, worsening or unpredictable symptoms can signal an emergency.[3] |
| Vasospastic | Temporary narrowing from artery spasm can produce symptoms, including at rest.[3] |
| Microvascular | Small-vessel problems can cause symptoms even without a major large-artery obstruction.[3] |
Risk reduction is broader than opening an artery
Smoking, blood pressure, cholesterol, diabetes and family history help shape risk. Some disease is silent. A population risk estimate helps discuss prevention but cannot guarantee whether a particular person will have an event. A symptom-free period is not a complete measure of arterial health.[2]
Care can include smoking cessation, physical activity, food-pattern changes and medicines addressing lipids, blood pressure or other risks. Selected medicines also relieve angina. These jobs differ, and an intervention should be judged against the outcome it is meant to improve.[4]
Tests examine anatomy, function, or acute injury
An ECG records electrical activity. Coronary CT angiography examines artery anatomy; a calcium scan looks for calcified plaque. Stress tests explore how the heart performs under increased demand. An invasive angiogram is another way to examine arteries. The appropriate choice depends on symptoms, risk and the question being asked.[2]
Possible heart attack requires urgent assessment, commonly including an ECG and blood tests. Acute testing has a different purpose from elective assessment of stable symptoms. A screening result or an old normal test should not be used to dismiss a new emergency.[7]
What a stent or bypass does
Angioplasty opens a narrowed artery, often using a stent to help hold it open. Coronary bypass surgery routes blood around a blockage. These procedures have particular indications and risks. They do not replace ongoing care for the underlying disease and other risk factors.[4]
NHLBI does not describe vitamins or chelation as proven substitutes for established coronary care. A supplement claim about “cleaning arteries” needs evidence for clinical outcomes, not just a proposed mechanism. Product marketing and a treatment recommendation are different kinds of information.[4]
New or changing symptoms need their own assessment
NHS guidance treats squeezing chest pain, pain spreading to an arm, neck or jaw, severe breathing difficulty or an unresponsive person as emergencies. Use the local emergency service. A known angina diagnosis does not make every future episode routine. Recovery and rehabilitation after a heart attack also vary.[7]
Cardiac rehabilitation is a structured programme
Exercise-based cardiac rehabilitation uses structured exercise, sometimes alongside education or psychological support. In coronary disease, programmes have been studied after heart attack or revascularisation and in selected other coronary presentations. A programme is more than advice to do some walking.[8]
Evidence & uncertainty
Disease type and clinical situation change what evidence applies. ISCHEMIA studied selected stable disease; its results do not settle emergency heart-attack treatment, left-main disease or severe heart failure. A procedure can have different effects on symptoms and future events.[5]
Selected-source overview · Independent review pendingPublished questions
Is coronary disease always a single blocked large artery?
Selected-source overview · Independent review pending. Read the evidence context.
It includes larger-artery and small-vessel problems, with or without a major obstruction.[1]
Evidence behind this answer
- Coronary Heart Disease
agency condition explanation · 2024
Selected relevant official page passages inspected · Coronary supply, large/small-vessel and obstructive/nonobstructive disease
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Are stable and unstable angina interchangeable terms?
Selected-source overview · Independent review pending. Read the evidence context.
A stable pattern is more predictable; new or worsening unstable symptoms can indicate an emergency.[3]
Evidence behind this answer
- Angina: Types
agency patient explanation · 2023
Selected relevant official page passages inspected · Stable, unstable, microvascular and vasospastic patterns
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Can small-vessel disease cause angina?
Selected-source overview · Independent review pending. Read the evidence context.
Microvascular problems can cause angina without a major large-artery obstruction.[3]
Evidence behind this answer
- Angina: Types
agency patient explanation · 2023
Selected relevant official page passages inspected · Stable, unstable, microvascular and vasospastic patterns
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Do a calcium scan and stress test answer the same question?
Selected-source overview · Independent review pending. Read the evidence context.
Calcium imaging examines calcified plaque; stress testing examines performance under increased demand.[2]
Evidence behind this answer
- Coronary Heart Disease: Diagnosis
agency patient explanation · 2024
Selected original agency indexed passages inspected · Risk context and electrical, anatomical and functional tests
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
What is the difference between a stent and bypass surgery?
Selected-source overview · Independent review pending. Read the evidence context.
A stent helps hold an opened artery; bypass surgery creates a route around a blockage.[4]
Evidence behind this answer
- Coronary Heart Disease: Treatment
agency patient explanation · 2024
Selected relevant official page passages inspected · Risk/symptom care, angioplasty, stents, bypass and unsupported substitutes
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Does ISCHEMIA mean procedures never help coronary disease?
Selected-source overview · Independent review pending. Read the evidence context.
The trial tested initial strategies in a selected stable population with important exclusions.[5]
Evidence behind this answer
- Initial Invasive or Conservative Strategy for Stable Coronary Disease
randomized trial · 2020
Original journal indexed passages and bibliographic abstract inspected; direct journal retrieval unavailable · Original abstract and selected indexed methods/discussion; population, comparison, main outcome and exclusions
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Is ISCHEMIA-EXTEND an independent second randomized population?
Selected-source overview · Independent review pending. Read the evidence context.
It follows survival in the original trial population, rather than providing independent replication.[6]
Evidence behind this answer
- Survival After Invasive or Conservative Management of Stable Coronary Disease
trial followup · 2023
Selected original journal report indexed passages inspected; full report not independently appraised · Original indexed survival follow-up report; all-cause versus cause-specific mortality
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Are a heart attack and cardiac arrest the same event?
Selected-source overview · Independent review pending. Read the evidence context.
They describe different problems: interrupted supply versus sudden loss of effective heart function.[7]
Evidence behind this answer
- Heart attack
agency patient explanation · 2026
Selected relevant official page passages inspected · Urgent changes, ECG/blood assessment, recovery and distinction from cardiac arrest
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
Does cardiac rehabilitation always mean exercising in a hospital?
Selected-source overview · Independent review pending. Read the evidence context.
No. The review included hospital, community and home programmes. The actual programme, support and clinical circumstances matter; a home label alone does not establish suitability.[8]
Evidence behind this answer
- Exercise-based cardiac rehabilitation for coronary heart disease
updated systematic review randomized trials · 2026
Original Cochrane summary and complete accepted-version abstract read, including lower abstract sections. 107 trials, searches March 2026. Full review PDF embargoed until September 2027 at Glasgow; detailed individual harms/disclosures not independently appraised. Earlier 2021/2023 versions conservatively share one family, not independent confirmation. Complete original repository abstract reread through limitations, review-era caveat and conclusions (lines 20–35); full PDF embargoed until September 2027. · Original 2026 plain-language summary and full original abstract; eligibility, search date, outcomes/certainty and limitations
This answer summarizes selected sources. An independent appraisal of the complete evidence has not been completed.
What the ISCHEMIA trial does—and does not—answer
ISCHEMIA randomized 5,179 people with selected stable coronary disease and moderate or severe ischemia to initial invasive care plus medical therapy or initial medical care with procedures if needed. Over a median 3.2 years, the investigators did not find a reduction in the main ischemic-event/death outcome with the initial invasive strategy.[5]
The trial excluded important groups, including recent acute coronary syndromes, significant left-main disease, markedly reduced ejection fraction and severe or unacceptable symptoms. Its comparison was between initial strategies, not “a stent versus no care.” It should not be generalized to all coronary disease.[5]
ISCHEMIA-EXTEND followed survival in the same study population for longer. It found similar all-cause mortality, with different patterns for cardiovascular and noncardiovascular deaths. This is follow-up of the original cohort, not independent replication, and survival follow-up does not answer every symptom or nonfatal-event question.[6]
What the updated randomized evidence found
A 2026 Cochrane update included 107 trials and 26,886 adults, with searches through March 2026. Compared with no structured exercise, rehabilitation reduced heart attacks and probably reduced overall hospital admissions over six to twelve months. It made little or no difference to further coronary procedures.[8]
Programme and population still matter
Women represented 17% of participants, and reporting and study quality varied. The review detected small-study bias for overall hospital admissions. These findings do not choose a personal exercise dose, delivery mode or return-to-work date.[8]
References
- Coronary Heart Disease
Agency condition explanation
NHLBI · Content/publication date: 2024
Accessed: 2026-10-08 UTC · Selected relevant official page passages inspected
Cited sections: Coronary supply, large/small-vessel and obstructive/nonobstructive diseaseUpdated 27 December 2024. Simplified artery-narrowing percentages are not supplied as personal diagnostic thresholds.
- Coronary Heart Disease: Diagnosis
Agency patient explanation
NHLBI · Content/publication date: 2024
Accessed: 2026-10-08 UTC · Selected original agency indexed passages inspected
Cited sections: Risk context and electrical, anatomical and functional testsUpdated 27 December 2024. No universal screening ages, test intervals, fasting instructions or assumption that one risk calculator is current everywhere.
- Angina: Types
Agency patient explanation
NHLBI · Content/publication date: 2023
Accessed: 2026-10-08 UTC · Selected relevant official page passages inspected
Cited sections: Stable, unstable, microvascular and vasospastic patternsUpdated 10 July 2023. No home diagnostic rule based on duration or a blanket claim that vasospastic symptoms cannot respond to medicine.
- Coronary Heart Disease: Treatment
Agency patient explanation
NHLBI · Content/publication date: 2024
Accessed: 2026-10-08 UTC · Selected relevant official page passages inspected
Cited sections: Risk/symptom care, angioplasty, stents, bypass and unsupported substitutesUpdated 27 December 2024. Broad roles only; no universal aspirin instruction or assumption that every procedure has the same event-prevention benefit.
- Initial Invasive or Conservative Strategy for Stable Coronary Disease
Randomized trial
Maron et al.; New England Journal of Medicine · Content/publication date: 2020
Accessed: 2026-10-08 UTC · Original journal indexed passages and bibliographic abstract inspected; direct journal retrieval unavailable
Cited sections: Original abstract and selected indexed methods/discussion; population, comparison, main outcome and exclusionsISCHEMIA, 5,179 randomized participants; median 3.2-year follow-up. No independent appraisal of the full report, supplements or all outcomes. ISCHEMIA-EXTEND is follow-up of this cohort.
- Survival After Invasive or Conservative Management of Stable Coronary Disease
Trial followup
Hochman et al.; Circulation · Content/publication date: 2023
Accessed: 2026-10-08 UTC · Selected original journal report indexed passages inspected; full report not independently appraised
Cited sections: Original indexed survival follow-up report; all-cause versus cause-specific mortalityPublished 3 January 2023; median follow-up 5.7 years. Same ISCHEMIA participants, not a separate randomized replication; extended survival ascertainment is not a complete reassessment of all original outcomes.
- Heart attack
Agency patient explanation
NHS · Content/publication date: 2026
Accessed: 2026-10-08 UTC · Selected relevant official page passages inspected
Cited sections: Urgent changes, ECG/blood assessment, recovery and distinction from cardiac arrestReviewed 31 March 2026. Local emergency pathways differ; this article does not reproduce self-treatment doses or estimate individual recovery.
- Exercise-based cardiac rehabilitation for coronary heart disease
Updated systematic review randomized trials
Dibben G and colleagues; Cochrane · Content/publication date: 2026
Accessed: 2026-10-20 UTC · Original Cochrane summary and complete accepted-version abstract read, including lower abstract sections. 107 trials, searches March 2026. Full review PDF embargoed until September 2027 at Glasgow; detailed individual harms/disclosures not independently appraised. Earlier 2021/2023 versions conservatively share one family, not independent confirmation. Complete original repository abstract reread through limitations, review-era caveat and conclusions (lines 20–35); full PDF embargoed until September 2027.
Cited sections: Original 2026 plain-language summary and full original abstract; eligibility, search date, outcomes/certainty and limitationsMarch 2026 search; full review not independently appraised.
Scope & review
- Population
- Mainly adult coronary-disease literacy; acute coronary events need urgent pathways
- Exposure or intervention
- Arterial disease, angina, assessment, risk management and revascularization
- Comparison
- Anatomy versus function; stable strategy trials versus emergencies
- Outcomes
- Symptoms, ischemic events, survival, procedure burden and rehabilitation
- Timeframe
- Acute changes, chronic care and selected trial follow-up
- Jurisdiction
- US agency explanations, international trial publications and UK NHS urgent guidance
Selected-source educational explanation. Official guidance, original study findings and editorial interpretation are distinguished. No exhaustive search, independent systematic synthesis or qualified medical review has been completed.
Sources checked on their individual access dates. Selected sources were checked; ongoing surveillance and qualified review have separate statuses on the coverage page.
Revision history
- 2026-10-08 UTC: Added a sourced explanation in a bounded ten-article batch; qualified review remains pending.
- 2026-10-20 UTC: Added bounded foundational distinctions and selected original comparison or official safety explanations. Preserved prior prose and pending qualified-review status; original-source access and applicability limits are recorded.
What this article still leaves open
- Complete contemporary guideline comparisons, absolute outcome estimates and symptom benefits by population.
- Dedicated accounts of acute coronary syndromes, microvascular/spasm testing, left-main disease and procedure-specific harms.
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