Relation between baseline risk and treatment decisions in non-ST elevation acute coronary syndromes: an examination
Insights
Revascularisation improves survival in non-ST elevation acute coronary syndromes with ST depression. However, procedure use varies internationally and is insensitive to ST depression extent, indicating care delivery inefficiencies.
Area of Science:
- Cardiology
- Clinical Medicine
- Public Health
Background:
- Non-ST elevation acute coronary syndromes (NSTE-ACS) represent a significant cause of cardiovascular mortality.
- Baseline electrocardiogram (ECG) findings, such as ST segment depression, can stratify risk in NSTE-ACS patients.
- The role of revascularisation in NSTE-ACS based on ECG findings requires further investigation.
Purpose of the Study:
- To investigate the relationship between baseline ST segment depression and outcomes after revascularisation in NSTE-ACS.
- To determine if ST segment depression influences clinical decision-making regarding cardiac procedures.
- To assess international variations in cardiac procedure utilization across different levels of ST segment depression.
Main Methods:
- Analysis of 11,453 patients from GUSTO-IIB, PARAGON-A, and PARAGON-B trials.
- Patients categorized by ST segment depression severity: none, ≥1 mm (two contiguous leads), and ≥2 mm (two contiguous leads).
- Comparison of revascularisation rates and outcomes across four geographic regions (USA, Canada, Europe, Australia/New Zealand).
Main Results:
- Revascularisation showed no survival benefit in patients without ST depression.
- A significant survival benefit was observed with revascularisation in patients with ST depression ≥1 mm.
- An inverse relationship existed between ST depression extent and the use of angiography/angioplasty, though bypass surgery increased with greater ST depression.
- Only the USA demonstrated a trend of increased revascularisation with increasing ST depression.
Conclusions:
- Current international practice patterns for cardiac procedures in NSTE-ACS appear inadequately sensitive to the extent of ST segment depression.
- Significant opportunities exist to optimize the delivery of care and improve patient outcomes across all studied regions.
- Standardizing care based on objective ECG markers like ST depression could enhance treatment efficiency.
Objectives:
To examine the interaction between ST segment depression on the baseline ECG and subsequent in-hospital revascularisation on six month mortality among patients with non-ST elevation acute coronary syndromes. To examine whether ST segment depression influenced clinical decision making and whether there was international variation in the use of cardiac procedures across ST segment depression categories.
Methods:
11 453 patients enrolled in GUSTO-IIB (global use of strategies to open occluded coronary arteries), PARAGON (platelet IIb/IIIa antagonism for the reduction of acute coronary syndrome events in a global organisation network) -A, and PARAGON-B were studied. Patients were categorised as having no ST segment depression, 1 mm ST segment depression in two contiguous leads, and ST segment depression > or = 2 mm in two contiguous leads. International practice across four geographic regions was examined: USA, Canada, Europe, and Australia/New Zealand.
Results:
Revascularisation appeared to have no impact on survival among patients with no ST segment depression; however, revascularisation was associated with a significant survival benefit among patients with ST segment depression > or = 1 mm. There was an inverse relation between the extent of ST segment depression and the use of angiography as well as angioplasty (p < 0.01). However, patients with ST segment depression > or = 2 mm were more likely to undergo bypass surgery. The only significant trend of increasing use of revascularisation procedures with increasing ST segment depression was observed in the USA.
Conclusions:
International practice patterns in procedure use appear to be insensitive to the extent of ST segment depression. Major opportunities for more efficient delivery of care exist in all regions.
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