Early Invasive Strategy for High‑Risk Non‑ST‑Elevation Acute Coronary Syndrome

Risk Stratification

Patients with elevated cardiac troponin are classified as having NSTEMI and meet high‑risk criteria that mandate early coronary angiography during the index hospitalization. European Society of Cardiology (ESC) guideline – Class I, Level A. 1
Diabetes mellitus is identified by ESC as an independent high‑risk feature that requires an early invasive management approach in NSTE‑ACS. ESC guideline – Class I, Level A. 5
The presence of multiple cardiovascular risk factors (e.g., hypertension, hyperlipidaemia, medication non‑adherence) further categorises patients as high‑risk, supporting an early invasive strategy. ESC guideline – Class I, Level B. 2
Uncontrolled hypertension on presentation (e.g., systolic ≥ 160 mm Hg) is another high‑risk marker that ESC recommends be addressed with prompt angiography. ESC guideline – Class I, Level B. 3

Once NSTEMI is confirmed by troponin elevation, additional serial troponin measurements do not change management and only delay definitive therapy. ESC guideline – Class IIa, Level B. 2
BNP/NT‑proBNP testing is not required for immediate decision‑making in patients who already meet high‑risk criteria; ordering it would unnecessarily postpone angiography. ESC guideline – Class IIb, Level C. 1
Stress testing (including adenosine nuclear stress) is contraindicated in the acute phase of NSTEMI and is reserved for low‑risk patients with normal biomarkers after 8–12 h of observation. ESC guideline – Class III, Level A. 4

Therapeutic unfractionated heparin should be continued in all high‑risk NSTE‑ACS patients awaiting angiography. ESC guideline – Class I, Level A. 5
GP IIb/IIIa receptor blockers (tirofiban or eptifibatide for 24 h; abciximab for 12 h if PCI is performed) are recommended as adjunctive therapy in high‑risk patients. ESC guideline – Class IIa, Level B. 4
Aspirin, β‑blocker, and nitrates should be maintained throughout the pre‑procedural period. ESC guideline – Class I, Level A. 3
Clopidogrel should be withheld when coronary artery bypass grafting is anticipated within the next 5 days, to reduce peri‑operative bleeding risk. ESC guideline – Class IIb, Level C. 1

Coronary angiography must be performed during the index hospitalization and as soon as logistically feasible for patients with elevated troponin and diabetes. ESC guideline – Class I, Level A. 5
Immediate angiography within the first hour is reserved for patients with hemodynamic instability, major arrhythmias, or ongoing severe ischemia; otherwise, the procedure should not be delayed beyond the current admission. ESC guideline – Class IIa, Level B. 2

Do not discharge high‑risk NSTEMI patients for outpatient stress testing; inpatient angiography is required when troponin is elevated and diabetes is present. ESC guideline – Class I, Level A. 4
Do not postpone angiography for additional biomarker measurements once NSTEMI is established and high‑risk features are present. ESC guideline – Class I, Level A. 5