Challenges in predicting the need for coronary artery bypass grafting at presentation in patients with non-ST-segment
Rajendra H Mehta1, Anita Y Chen, Charles V Pollack
1Duke Clinical Research Institute, Duke University Medical Center, Durham, North Carolina, USA. mehta007@dcri.duke.edu
Insights
Predicting coronary artery bypass grafting (CABG) needs in non-ST-segment elevation acute coronary syndromes (NSTE-ACS) is challenging. Current models show modest accuracy, making it difficult to balance antiplatelet benefits with bleeding risks before angiography.
Area of Science:
- Cardiology
- Clinical Decision-Making
- Health Services Research
Background:
- Non-ST-segment elevation acute coronary syndromes (NSTE-ACS) management is complicated by bleeding risks with antiplatelet agents in patients needing coronary artery bypass grafting (CABG).
- Clinicians often delay antiplatelet therapy, like clopidogrel, until coronary anatomy is known, potentially missing therapeutic benefits.
Purpose of the Study:
- To develop a predictive model for identifying patients with NSTE-ACS who require CABG during their initial hospitalization.
- To aid clinicians in balancing antiplatelet therapy benefits against perioperative bleeding risks.
Main Methods:
- Analysis of 61,974 high-risk NSTE-ACS patients from the CRUSADE registry (2001-2003).
- Development of a multivariate model using 13 presenting clinical characteristics to predict CABG likelihood.
- Evaluation of the model's predictive accuracy and calibration.
Main Results:
- 14% (8,395) of patients underwent CABG during hospitalization.
- Key predictors for CABG included prior CABG, male gender, heart failure, diabetes, renal insufficiency, and age ≥75.
- The predictive model demonstrated only modest accuracy (c-index = 0.67).
Conclusions:
- While some clinical factors predict increased CABG likelihood in NSTE-ACS, reliably identifying these patients pre-angiography remains difficult.
- The modest accuracy of the developed model highlights the challenge in optimizing perioperative antiplatelet management for NSTE-ACS patients.
Abstract:
In the case of non-ST-segment elevation acute coronary syndromes (NSTE-ACSs), the acute use of certain antiplatelet agents is complicated by concerns about perioperative bleeding risks in patients requiring coronary artery bypass grafting (CABG) during the index hospitalization. As a result, clinicians often withhold potentially useful agents, such as clopidogrel, before determining patients' coronary anatomy. An accurate predictive model could allow for a better balance of this safety concern with the demonstrated benefits of agents such as clopidogrel. To create an accurate decision-making tool that would assess, at hospital presentation, the need for CABG in patients with NSTE-ACSs, we studied 61,974 high-risk patients with NSTE-ACS admitted to 311 CABG-capable hospitals participating in Can Rapid Risk Stratification of Unstable Angina Patients Suppress Adverse Outcomes With Early Implementation of the American College of Cardiology/American Heart Association Guidelines (CRUSADE) from 2001 to 2003. A total of 8,395 patients (14%) underwent CABG during their initial hospital stay. A multivariate model was developed and identified 13 presenting clinical characteristics significantly associated with the likelihood of CABG (previous CABG, male gender, previous heart failure, diabetes, hyperlipidemia, renal insufficiency, ST depression and transient ST elevation, age > or = 75 years, previous percutaneous coronary intervention, family history of coronary artery disease, hypertension, trends in CABG rates, and previous stroke). This model had only modest predictive accuracy and calibration (c-index = 0.67). In conclusion, although certain presenting clinical features are associated with an increased likelihood of CABG in patients with NSTE-ACSs during the index hospitalization, it remains difficult to reliably identify, before diagnostic angiography, those who will subsequently undergo surgical revascularization.
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