Influence of updated guidelines on short- and long-term mortality in patients with non-ST-segment elevation acute
13rd Department Medicine, Cardiology and Emergency Medicine, Wilhelminen Hospital, Montleartstrasse 37, 1160 Vienna, Austria. Birgit.Vogel@wienkav.at
Insights
Updated guidelines for unstable angina (UA) and non-ST-segment elevation myocardial infarction (NSTEMI) significantly reduced short- and long-term mortality. However, high-risk patients still often miss out on beneficial early invasive treatment.
Area of Science:
- Cardiology
- Clinical Medicine
- Public Health
Background:
- Updated ACC/AHA guidelines for unstable angina (UA) and non-ST-segment elevation myocardial infarction (NSTEMI) were released in 2002.
- Assessing the impact of these guideline updates on patient mortality is crucial for clinical practice.
Purpose of the Study:
- To evaluate whether the implementation of updated ACC/AHA guidelines influenced short- and long-term mortality in patients with UA and NSTEMI.
- To identify any remaining gaps in the application of evidence-based treatment strategies.
Main Methods:
- Analysis of 812 consecutive patients admitted with UA or NSTEMI between 2001 and 2004.
- Comparison of mortality rates between patients admitted before (2001-2002) and after (2003-2004) the guideline update.
- Four-year follow-up for all-cause mortality.
Main Results:
- Significant increase in revascularization rates, early procedures (<48h), and clopidogrel administration post-guideline update.
- Reduced four-year mortality for UA patients (15.1% vs. 26.5%) and in-hospital mortality for NSTEMI patients (9.6% vs. 18.4%).
- One-year mortality for NSTEMI patients also decreased significantly (25.1% vs. 34.7%).
Conclusions:
- Implementation of updated NSTE-ACS guidelines positively impacted both short- and long-term mortality.
- A significant number of high-risk patients still do not receive the recommended early invasive treatment.
- Further efforts are needed to ensure guideline adherence for optimal patient outcomes.
Aim:
In 2002 the ACC/AHA guidelines for the management of patients with unstable angina (UA) and non-ST-segment elevation myocardial infarction (NSTEMI) were updated. We aimed to answer whether the implementation of updated guidelines was capable of influencing short- and long-term mortality in these patients.
Methods:
We analyzed data on 812 consecutive patients who were admitted with either UA or NSTEMI between 2001 and 2004. Patients admitted in the two years before the implementation of updated guidelines (UA(01/02) group and NSTEMI(01/02) group) were compared to patients admitted in the two years thereafter (UA(03/04) group and NSTEMI(03/04) group). Yearly follow-up concerning all-cause mortality was obtained up to four years.
Results:
The rate of revascularizations, the percentage of procedures performed within 48 h of admission, and the administration of clopidogrel increased significantly. However, still many - especially high-risk - patients did not receive revascularization. Patients of both UA groups had an identical in-hospital mortality rate. Differences in mortality between groups gained statistical significance over time (four-year mortality; 15.1% for the UA(03/04) group vs. 26.5% for the UA(01/02) group, p=0.014; HR 0.49 95% CI 0.28-0.87). In patients with NSTEMI in-hospital mortality decreased from 18.4% in the NSTEMI(01/02) group to 9.6% in the NSTEMI(03/04) group (p=0.011; HR 0.47 95% CI 0.26-0.84), and 1-year mortality from 34.7% to 25.1% (p=0.038; HR 0.63 95% CI 0.41-0.98), respectively. Mortality rates beyond one year were still lower in the NSTEMI(03/04) group as compared to the NSTEMI(01/02) group but it did not reach statistical significance. Multivariate Cox-regression analysis revealed furthermore that also patients with higher age and/or renal dysfunction benefit from an early invasive strategy.
Conclusion:
The implementation of updated guidelines for NSTE-ACS had significant impact on short- and long-term mortality. However, an early invasive strategy is still withheld to a significant number of high-risk patients, who would benefit from an invasive treatment.
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