🫀 Atypical Angina – Full Notes

📌 Definition

Atypical angina (also called non-classical angina) refers to chest pain that does not meet all the criteria of typical angina.

👉 It usually has 2 out of 3 classic angina features:

1. Substernal chest discomfort

2. Provoked by exertion or stress

3. Relieved by rest or nitrates

• Typical angina → all 3 features

• Atypical angina → any 2 features

• Non-anginal chest pain → ≤1 feature

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🧠 Pathophysiology

• Caused by myocardial ischemia, but presentation varies

• May involve:

  • Partial coronary artery obstruction

  • Microvascular dysfunction

  • Coronary vasospasm

👉 Common mechanism: imbalance between oxygen supply and demand

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⚠️ Risk Factors

Same as coronary artery disease (CAD):

• Age (>45 men, >55 women)

• Diabetes mellitus

• Hypertension

• Smoking

• Dyslipidemia

• Obesity

• Sedentary lifestyle

• Family history of CAD

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🔍 Clinical Features

🧾 Symptoms (less typical presentation)

• Chest discomfort may be:

  • Sharp, stabbing, or burning

  • Not strictly retrosternal

• Pain may radiate to:

  • Jaw

  • Neck

  • Back

  • Epigastrium

🚨 Associated Symptoms

• Dyspnea (common!)

• Nausea or vomiting

• Fatigue

• Dizziness

• Indigestion-like feeling

👉 Important:
More common in:

• Women

• Elderly

• Diabetics (silent or atypical ischemia)

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⚖️ Differences: Typical vs Atypical Angina

Feature	Typical Angina	Atypical Angina
Pain nature	Pressure, squeezing	Variable (burning, sharp)
Location	Retrosternal	May be diffuse/epigastric
Trigger	Exertion	May be unclear
Relief	Rest/nitrates	May be inconsistent
Diagnosis	Easier	Often missed

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🧪 Investigations

1. ECG

• May be normal at rest

• During pain: ST depression or T-wave inversion

2. Cardiac Biomarkers

• Troponin (to rule out MI)

3. Stress Testing

• Exercise stress ECG

• Stress echocardiography

4. Imaging

• Coronary angiography (gold standard)

• CT coronary angiography

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🩺 Diagnosis

Based on:

• Clinical history (very important!)

• Risk factors

• ECG + stress testing

👉 Often requires high suspicion, especially in atypical cases.

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💊 Management

🧴 Lifestyle Modifications

• Smoking cessation

• Weight control

• Regular exercise

• Healthy diet

💉 Medical Therapy

• Nitrates (symptom relief)

• Beta-blockers (↓ demand)

• Calcium channel blockers

• Antiplatelets (e.g., Aspirin)

• Statins

🏥 Revascularization (if severe)

• PCI (angioplasty)

• CABG

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⚡ Complications

• Myocardial infarction

• Arrhythmias

• Heart failure

• Sudden cardiac death

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🚨 Key Clinical Points (Exam Pearls)

• Atypical angina = 2/3 classic features

• Common in women, elderly, diabetics

• Often presents as:

  • Breathlessness instead of chest pain

• Can mimic:

  • Gastritis

  • Musculoskeletal pain

• Always rule out acute coronary syndrome (ACS)

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🧠 Quick Memory Trick

👉 “Atypical = Almost typical (2/3)”

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If you want, I can also give:

• MCQs on atypical angina

• Case-based questions

• Quick revision charts

• Comparison with unstable angina and MI