Invasive management of acute coronary syndrome: Interaction with competing risks
Anthony Ming-Yu Chuang1, David G Hancock1, Amera Halabi1
1School of Medicine, Flinders University of South Australia, Adelaide, Australia; Department of Cardiovascular Medicine, Southern Adelaide Local Health Network, Adelaide, Australia.
Insights
Invasive management benefits acute coronary syndrome (ACS) patients with lower comorbidity risk. Higher non-ACS risk diminishes invasive strategy benefits, necessitating better risk assessment for treatment decisions.
Area of Science:
- Cardiology
- Clinical Medicine
- Health Services Research
Background:
- Acute coronary syndrome (ACS) management decisions are influenced by patient risk.
- Understanding the interplay between ACS-specific risk and non-ACS comorbidities is crucial for optimizing invasive strategies.
Purpose of the Study:
- To characterize the interaction between ACS-specific risk and non-ACS comorbidity risk on the benefits of invasive management in ACS patients.
- To evaluate how comorbidities affect mortality outcomes following invasive procedures in ACS.
Main Methods:
- Utilized data from 3057 ACS patients admitted between 2003-2011.
- Assessed ACS-specific risk (GRACE score) and non-ACS risk (Charlson Comorbidity Index - CCI).
- Employed inverse-probability-of-treatment weighting and flexible parametric models for adjusted survival analysis.
Main Results:
- Invasive management significantly reduced 1-year mortality in low (CCI ≤ 1) and medium (CCI 2-3) non-ACS risk groups (HR 0.38 and 0.46, respectively).
- No significant mortality benefit from invasive management was observed in the high non-ACS risk group (CCI ≥ 4; HR 1.02).
- A complex, non-linear interaction exists between ACS-specific risk and non-ACS risk regarding the benefits of invasive treatment.
Conclusions:
- The benefit of invasive management in ACS patients is modulated by the presence and severity of non-ACS comorbidities.
- Current risk stratification may not fully capture the impact of comorbidities on treatment outcomes.
- Developing robust methods to quantify non-ACS comorbidity risk is essential for informed clinical decision-making in ACS management.
Background:
The aim of this study was to characterise the interaction between ACS- and non-ACS-risk on the benefits of invasive management in patients presenting with acute coronary syndrome (ACS).
Methods:
Consecutive patients admitted to a tertiary hospital's Cardiac Care Unit in the months of July-December, 2003-2011 with troponin elevation (>30 ng/L) were included. "ACS-specific-risk" was estimated using the GRACE score and "non-ACS-risk" was estimated using the Charlson-Comorbidity-Index (CCI). Inverse-probability-of-treatment weighting was used to adjust for baseline differences between patients who did or did not receive invasive management. A multivariable flexible parametric model was used to characterise the time-varying hazard.
Results:
In total, 3057 patients were included with a median follow-up of 9.0 years. Based on CCI, 1783 patients were classified as 'low-non-ACS risk' (CCI ≤ 1; invasive management 81%; 12-month mortality 5%), 820 as 'medium-non-ACS risk' (CCI 2-3; invasive management 68%; 12-month mortality 13%), and 468 as 'high-non-ACS risk' (CCI ≥ 4; invasive management 47%; 12-month mortality 29%). After adjustment, invasive management was associated with a significant reduction in one-year overall-mortality in the 'low-risk' and 'medium-risk' groups (HR = 0.38, 95%CI:0.26-0.56; HR = 0.46, 95%CI:0.32-0.67); but not in the 'high-risk' group (HR = 1.02, 95%CI:0.67-1.56). The absolute benefit of invasive management was greatest with higher baseline ACS-risk, with a non-linear interaction between ACS- and non-ACS-risk.
Conclusions:
There is a complex interaction between ACS- and non-ACS-risk on the benefit of invasive management. These results highlight the need to develop robust methods to objectively quantify risk attributable to non-ACS comorbidities in order to make informed decisions regarding the use of invasive management in individuals with numerous comorbidities.
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