ANGINA PECTORIS

✓ Medically ReviewedDISEASEID: MDBT0053🚨 TRIAGE: URGENTICD-10: I20.9

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Definition

CLINICAL DEFINITION

Angina pectoris is transient retrosternal pressure from myocardial ischaemia (heart muscle blood shortage). It typically starts on exertion (physical effort) or emotion and eases with rest. Stable angina follows a predictable effort threshold without rest pain. Unstable, vasospastic (vessel spasm related) and microvascular (small vessel related) forms cause rest or variable pain.

IN PLAIN ENGLISH

Angina is chest tightness when the heart gets too little blood. It often feels like pressure in the middle of the chest. It comes with effort or stress and eases with rest. New pain at rest or a changed pattern needs urgent care.

COMMON MISCONCEPTION / WHAT IT DOES NOT MEAN

Angina pectoris is not myocardial infarction (heart attack with muscle death). Infarction pain lasts longer at rest with troponin (heart injury blood marker) rise. Angina is not chest wall pain that is sharp and tender to touch. It is not reflux (acid backflow burn) that follows meals.

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Word Breakdown

angin-

=to choke or constrict

-a

=condition or state

Literal Meaning: choking tightness of the chest

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Abbreviations

AP=Angina pectoris - chest tightness from heart muscle blood shortage

SAP=Stable angina pectoris - predictable exertional pattern

UAP=Unstable angina pectoris - new, rest or worsening pattern

CCS=Canadian Cardiovascular Society - body grading angina by effort threshold

ECG=Electrocardiogram - heart electrical tracing

GTN=Glyceryl trinitrate - under-tongue vessel relaxant for angina

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Synonyms & Variants

Stable angina›Angina›Exertional chest pain›

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Category-Specific Context

Angina pectoris is a Disease because it is a recognisable syndrome (set of symptoms) with causes and course. It sits within ischaemic heart disease (heart blood supply disorder) alongside infarction. Stable angina reflects chronic coronary syndrome (long term artery disease). Unstable angina belongs with acute coronary syndrome (sudden heart emergency).

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Clinical Context & Usage

CLINICAL SETTINGS

Primary CareEmergency DepartmentCardiology ClinicAcute Medical UnitCardiac Rehabilitation

USAGE & DOCUMENTATION NOTES

Use angina pectoris for transient ischaemic (brief blood shortage) chest discomfort with clear trigger and relief. Specify stable, unstable, vasospastic (spasm related) or microvascular (small vessel related) type. Record triggers, duration, relief, CCS (Canadian Cardiovascular Society) grade and risk factors. Do not use it alone when rest pain, ECG (heart tracing) shifts or troponin (injury marker) rise suggest infarction.

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Primary Causes & Pathophysiology

PATHOPHYSIOLOGY

Most stable angina is supply demand mismatch from atherosclerosis (artery plaque build up). Exertion raises oxygen (cell fuel) demand beyond narrowed artery supply. Vasospasm (sudden vessel tightening) can abruptly cut flow at rest. Microvascular dysfunction (small vessel control failure) impairs flow without major blockage. Severe valve disease, anaemia (low red cells) or fast rhythm worsen the mismatch.

PRIMARY CAUSES

Atherosclerotic coronary artery disease

Plaque narrows arteries and limits flow when demand rises on effort

Coronary vasospasm

Sudden vessel tightening briefly cuts supply even at rest without plaque rupture

Microvascular dysfunction

Small vessels fail to dilate so perfusion (blood delivery) falls during stress

Severe aortic stenosis (tight aortic valve)

Thick valve raises muscle demand and lowers coronary filling pressure

Hypertrophic cardiomyopathy (thick heart muscle)

Thick muscle raises demand and squeezes small vessels during effort

Severe anaemia (low haemoglobin)

Low oxygen carriage worsens supply demand balance on exertion

Sustained tachyarrhythmia or severe hypertension (fast rhythm or high pressure)

Shortens diastole (heart filling phase) and raises demand beyond supply

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Drug-Induced Causes

💊 Cocaine ↗

Mechanism: Provokes vasospasm (vessel tightening) and raises demand through sympathetic surge

→ Stop drug, seek urgent care, vasodilator led assessment with monitoring

💊 Triptans (migraine therapy) ↗

Mechanism: Constrict coronary vessels and may trigger spasm in susceptible patients

→ Stop trigger and seek urgent cardiac review for rest pain

💊 Ergot alkaloids ↗

Mechanism: Cause prolonged vasospasm with reduced coronary flow

→ Withdraw drug and monitor for ischaemia with urgent assessment

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Epidemiology

Prevalence:Angina is common in middle aged and older adults with coronary risk factors. Frequency rises with age, hypertension (high blood pressure) and diabetes (high blood sugar). Smoking and lipid (blood fat) burden shape cases. Exact rates differ by definition and survey method.

Age Group:Most cases occur in middle aged and older adults. Risk rises with advancing age through atherosclerosis (artery plaque disease). Younger cases often involve smoking, familial risk (inherited risk) or vasospasm (vessel tightening).

Geographic Distribution:Angina occurs worldwide wherever atherosclerotic (plaque related) coronary disease exists. Reported diagnosis rises with access to ECG (heart tracing), stress testing and angiography (artery imaging). Prevention and treatment access shape recorded burden.

Red Flags & Triage ★

TRIAGE LEVEL

🚨 URGENT

DO NOT MISS — LIFE-THREATENING PRESENTATIONS

Myocardial infarction with rest pain and troponin rise
Unstable angina with crescendo pattern needing admission
Aortic dissection with tearing radiation to the back
Pulmonary embolism with pleuritic pain and tachycardia (fast heart)
Severe aortic stenosis with syncope (faint) and murmur

URGENT EVALUATION TRIGGERS

Pain at rest lasting several minutes without relief
New severe, more frequent or lower threshold pattern
Pain with breathlessness, sweating, nausea or dizziness
Ischaemic ECG (tracing) shifts or troponin (injury marker) rise
Hypotension (low pressure), syncope (faint) or sustained arrhythmia (rhythm disturbance)

Contraindications & Precautions

CONTRAINDICATIONS

Do not delay emergency care for rest or prolonged pain
Do not use a normal resting ECG alone to exclude ischaemia

SPECIAL PRECAUTIONS

Monitor pressure and heart rate during rate control therapy
Assess bleeding risk before single or dual antiplatelet therapy
Correct anaemia, hypotension (low pressure) and thyroid triggers that raise demand
Counsel on GTN (vessel relaxant) use and when to call emergency services

Complications

DOWNSTREAM CLINICAL COMPLICATIONS

Myocardial infarction
Unstable angina
Heart failure
Arrhythmia
Sudden cardiac death

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Confused With (LASA & DDx) ★

LEXICAL (LASA) — SIMILAR NAMES

Angioedema

Shares angio start but is swelling from allergy, not ischaemic (blood shortage) chest pain

Angiomax

Brand name with similar prefix that risks verbal order confusion with angina

Agranulocytosis

Long word with angina-like opening that can be misread on lists

CLINICAL DIFFERENTIAL DIAGNOSES (DDx)

Myocardial infarction

Key Distinguishing Feature: Prolonged rest pain with troponin (injury marker) rise and ECG shifts

Gastro-oesophageal reflux

Key Distinguishing Feature: Burning after meals relieved by antacids without exertion pattern

Costochondritis

Key Distinguishing Feature: Sharp tender chest wall pain worse with touch or movement

Pulmonary embolism

Key Distinguishing Feature: Pleuritic pain with breathlessness, fast heart and clot risk factors

Aortic dissection

Key Distinguishing Feature: Sudden tearing pain to the back with pulse or pressure differences

Panic attack

Key Distinguishing Feature: Peak anxiety with tingling and preserved exertion tolerance between episodes

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Clinical Pearls

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Ask exertion threshold and relief with rest or GTN (vessel relaxant). A lower threshold or any rest pain signals possible instability needing same-day ECG and troponin.

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A normal resting ECG does not exclude angina. Arrange exercise testing or coronary CT angiography (artery scan) when suspicion persists.

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Start secondary prevention alongside symptom relief. Statin (cholesterol lowering drug) plus antiplatelet suits most atherosclerotic cases after bleeding check.

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Rest pain within days, pain lasting over 10 minutes, or pain with breathlessness needs emergency assessment. Give GTN only while arranging urgent review.

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Ask about cocaine, triptans and ergots in rest angina. These can provoke vasospasm (vessel tightening) and change acute management.

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Example Usage & SOAP

CLINICAL SENTENCE

""He reports exertional retrosternal tightness eased by rest and GTN from stable angina.""

IN A SOAP NOTE

S: 61-year-old with exertional chest pressure climbing stairs, eased by rest. O: BP 142/86, HR 76, RR 16, SpO2 98 percent on air, Temp 36.7C, lungs clear, ECG pending. A: Stable angina likely from chronic coronary disease. P: ECG and troponin, exercise or CT angiography plan, risk factor review, GTN counselling with safety net.

DIFFERENTIAL DIAGNOSIS CONTEXT

Exertional pressure eased by rest favours angina over chest wall pain. Prolonged rest pain with troponin rise suggests infarction (heart attack). Burning after meals suggests reflux (acid backflow). Sharp pain worse with breathing or touch suggests pleural (lung lining) or musculoskeletal (muscle bone) cause.

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Classifications & Scoring

GRADING SYSTEM

Canadian Cardiovascular Society Angina Grading

Grades I to IV by exertion threshold from strenuous effort to rest symptoms

SCORING TOOL

Diamond-Forrester Model

Estimates pretest probability of coronary disease from age, sex and pain type

SCORING TOOL

Duke Treadmill Score

Risk scores exercise testing by duration, ST shifts and angina index

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Prognosis

SHORT-TERM OUTCOME

Stable angina often settles with rest and sublingual nitrate (under tongue vessel relaxant). Short term risk is low when the pattern is unchanged. New, prolonged or rest symptoms raise acute coronary syndrome (sudden heart emergency) risk. Prompt assessment improves short term safety.

LONG-TERM PROGNOSIS

Long term outlook follows coronary extent, pump function and risk control. Lipid (blood fat), pressure and smoking control improves course. Some patients need revascularisation (flow restoring procedure) for symptoms or anatomy. Without control, infarction (muscle death) and heart failure risk rises.

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References & Coding

ICD-10 DIAGNOSTIC CODE

I20.9

LITERATURE CITATIONS & GUIDELINES

[1]ESC Guidelines for chronic coronary syndromes 2024

[2]NICE CG95 Chest pain of recent onset

[3]AHA ACC Guideline for chronic coronary disease 2023

MEDICAL DISCLAIMER — This content is intended for educational purposes and qualified healthcare professionals only. Always refer to current clinical diagnostic criteria, institutional protocols, and official guidelines. Medobo is not responsible for clinical decisions made based on this content.