Stable angina vs Unstable angina
How to tell Stable angina and Unstable angina apart when a board question makes them look alike.
Step 2 CK pairs are in open beta while clinical review finishes. Spot an issue? Tell us.
Ischemic chest pain at rest or rapidly worsening frequency indicates unstable angina.
Side by side
Predictable exertional chest discomfort relieved by rest or nitroglycerin within minutes suggests stable angina.
New, worsening, or rest chest pain lasting at least 20 minutes with negative troponin suggests unstable angina.
Fixed coronary stenosis limits flow during demand stress.
Plaque disruption with non-occlusive thrombus causes dynamic ischemia without infarction biomarkers.
Troponin remains negative and ECG may be normal or show stable exertional ST depression without dynamic resting changes.
Troponin remains below infarction threshold but ECG may show transient ST depression or T-wave inversion and symptoms occur at rest or crescendo pattern.
The trap
Normal troponin is mistaken as low risk and patients are discharged despite crescendo or rest pain. Unstable angina still requires admission, antithrombotic therapy, and early risk stratification.
The repair move
Next best step: admit for acute coronary syndrome management, start aspirin 325 mg chew then 81 mg daily, begin anticoagulation such as unfractionated heparin infusion, add anti-ischemic therapy, and pursue early invasive risk-based evaluation. Stable angina without high-risk features is managed outpatient with antianginals and risk-factor control.
Try a free question
CoreA patient has new chest pain at rest with transient ST depression and negative troponin levels. What is the next best step in management?
Show answer and explanation
Answer: A. Admit for unstable angina treatment with antithrombotic therapy. Unstable angina is managed as ACS in the hospital even when troponin remains negative.
Why the other choices are tempting
- B. Wrong. Negative troponin does not eliminate unstable angina danger.
- C. Wrong. Delay without treatment risks progression to infarction.
- D. Wrong. GI therapy does not treat ischemic chest pain.
- E. Wrong. Fibrinolysis is for STEMI, not troponin-negative unstable angina.
Flashcards
Tap a card to flip it.
Which symptom pattern distinguishes unstable from stable angina most reliably?
Rest pain or rapidly worsening frequency and severity indicates unstable angina.
How can troponin be in unstable angina?
Troponin can remain negative because ischemia has not caused measurable necrosis.
Quick answers
What is the fastest way to tell Stable angina from Unstable angina?
Ischemic chest pain at rest or rapidly worsening frequency indicates unstable angina.
What is the key clue for Stable angina?
Predictable exertional chest discomfort relieved by rest or nitroglycerin within minutes suggests stable angina.
What is the key clue for Unstable angina?
New, worsening, or rest chest pain lasting at least 20 minutes with negative troponin suggests unstable angina.
What is the common trap with Stable angina vs Unstable angina?
Normal troponin is mistaken as low risk and patients are discharged despite crescendo or rest pain. Unstable angina still requires admission, antithrombotic therapy, and early risk stratification.