The Incorrect Statement is A: Thrombolysis is NOT Administered for Unstable Angina
Statement A is incorrect. Thrombolysis is contraindicated in unstable angina, regardless of whether primary PCI is feasible or not. This is a critical distinction that separates unstable angina from STEMI management.
Why Thrombolysis is Wrong in Unstable Angina
Unstable angina is part of the non-ST-elevation acute coronary syndrome (NSTE-ACS) spectrum. The 2025 ACC/AHA guidelines clearly establish that patients with NSTE-ACS, including unstable angina, require an invasive strategy with coronary angiography and potential revascularization (PCI or CABG), not thrombolysis 1, 2.
Key Management Principles:
For unstable patients with refractory symptoms:
- Immediate invasive strategy (<2 hours) with intent to revascularize 1, 2
- Transfer to PCI-capable facility if needed
- Medical therapy includes heparin, aspirin, beta-blockers, and antiplatelet agents
For stable patients:
- Routine invasive approach for high/intermediate-risk patients 1
- Selective invasive approach for low-risk patients with noninvasive testing first 2
Historical Context on Thrombolysis
Early research from the 1990s explored thrombolysis in unstable angina but found it ineffective and potentially harmful 3. Only one-third of patients had demonstrable intracoronary thrombi, and clinical outcomes were not improved. Thrombolysis is reserved exclusively for STEMI when primary PCI is not available within appropriate time windows.
Why the Other Statements Are Correct
B) ECG may be normal - Correct. Many unstable angina patients have normal or nonspecific ECG findings. Some show ST-segment depression or T-wave changes, but a normal ECG does not exclude the diagnosis 4.
C) Angina occurs at rest - Correct. This is a defining feature of unstable angina - new onset severe angina, crescendo pattern, or rest angina distinguishes it from stable angina 4, 5.
D) Requires hospitalization - Correct. All patients with unstable angina should be admitted to a coronary care or intensive care unit for monitoring and treatment 6. The 2025 guidelines emphasize immediate hospitalization for risk stratification and invasive management 1, 2.
E) Pain subsides with nitrates - Correct. Intravenous nitroglycerin is first-line therapy and typically relieves ischemic pain, though some patients may be refractory and require urgent intervention 7, 6.
Common Pitfall to Avoid
Do not confuse unstable angina management with STEMI management. Thrombolysis has no role in NSTE-ACS/unstable angina. The treatment paradigm is medical stabilization followed by coronary angiography with revascularization as indicated, not fibrinolytic therapy.