Alaa Alghamry1, Joseph Hanna2, Anita Pelecanos3, Stephen Kyranis4, Vinod Khelgi5, Peter O'Rourke3, Oran Carroll5, Cassie Oxenford5, Swetha Rangaswamaiah5, Christopher Tan6. 1. University of Queensland, Australia; Department of Medicine, Redcliffe Hospital, Redcliffe, Australia. Electronic address: alaa.alghamry@health.qld.gov.au. 2. University of Queensland, Australia; Department of Cardiology, The Prince Charles Hospital, Brisbane, Australia. 3. QIMR Berghofer Medical Research Institute, Brisbane, Australia. 4. Department of Cardiology, The Prince Charles Hospital, Brisbane, Australia. 5. Department of Medicine, Redcliffe Hospital, Redcliffe, Australia. 6. University of Queensland, Australia; Department of Medicine, Redcliffe Hospital, Redcliffe, Australia.
Abstract
BACKGROUND: Cardiac Troponin I (cTnI) is frequently measured in patients presenting with symptomatic atrial fibrillation (AF). The significance of elevated cTnI levels in this patient cohort is unclear. We investigated the value of cTnI elevation in this setting and whether it is predictive for significant coronary artery disease (sCAD). METHODS: We conducted a retrospective, single-center, case-control study of 231 patients who presented with symptomatic AF to The Prince Charles Hospital emergency department, Brisbane, Australia between 2006 and 2014. Patients who underwent serial cTnI testing and assessment for CAD were included. Clinical variables that are known to predict CAD and could potentially predict cTnI elevation were collected. Binary logistic regression was performed to identify predictors of sCAD and cTnI elevation. RESULTS: Cardiac Troponin I elevation above standard cut off was not predictive for sCAD after adjustment for other predictors (OR 1.62, 95% CI 0.79-3.32. p=0.19). However, the highest cTnI concentration value (cTnI peak) was predictive for sCAD (OR 2.02, 95% CI 1.02-3.97, p=0.04). Dyspnea on presentation (OR 4.52, 95% CI 1.87-10.91, p=0.001), known coronary artery disease (OR 3.44, 95% CI 1.42-8.32, p=0.006), and ST depression on the initial electrocardiogram (OR 2.57, 95% CI 1.11-5.97, p=0.028) predicted sCAD in our cohort, while heart rate on initial presentation was inversely correlated with sCAD (OR 0.99, 95% CI 0.971-1.00, p=0.034). CONCLUSION: Troponin elevation is common in patients presenting to hospital with acute symptomatic AF and it is not a reliable indicator for underlying sCAD in this patient cohort. However, cTnI peak was a predictor of significant coronary artery disease.
BACKGROUND:Cardiac Troponin I (cTnI) is frequently measured in patients presenting with symptomatic atrial fibrillation (AF). The significance of elevated cTnI levels in this patient cohort is unclear. We investigated the value of cTnI elevation in this setting and whether it is predictive for significant coronary artery disease (sCAD). METHODS: We conducted a retrospective, single-center, case-control study of 231 patients who presented with symptomatic AF to The Prince Charles Hospital emergency department, Brisbane, Australia between 2006 and 2014. Patients who underwent serial cTnI testing and assessment for CAD were included. Clinical variables that are known to predict CAD and could potentially predict cTnI elevation were collected. Binary logistic regression was performed to identify predictors of sCAD and cTnI elevation. RESULTS:Cardiac Troponin I elevation above standard cut off was not predictive for sCAD after adjustment for other predictors (OR 1.62, 95% CI 0.79-3.32. p=0.19). However, the highest cTnI concentration value (cTnI peak) was predictive for sCAD (OR 2.02, 95% CI 1.02-3.97, p=0.04). Dyspnea on presentation (OR 4.52, 95% CI 1.87-10.91, p=0.001), known coronary artery disease (OR 3.44, 95% CI 1.42-8.32, p=0.006), and ST depression on the initial electrocardiogram (OR 2.57, 95% CI 1.11-5.97, p=0.028) predicted sCAD in our cohort, while heart rate on initial presentation was inversely correlated with sCAD (OR 0.99, 95% CI 0.971-1.00, p=0.034). CONCLUSION: Troponin elevation is common in patients presenting to hospital with acute symptomatic AF and it is not a reliable indicator for underlying sCAD in this patient cohort. However, cTnI peak was a predictor of significant coronary artery disease.
Authors: Amit Kaura; Ahran D Arnold; Vasileios Panoulas; Benjamin Glampson; Jim Davies; Abdulrahim Mulla; Kerrie Woods; Joe Omigie; Anoop D Shah; Keith M Channon; Jonathan N Weber; Mark R Thursz; Paul Elliott; Harry Hemingway; Bryan Williams; Folkert W Asselbergs; Michael O'Sullivan; Graham M Lord; Narbeh Melikian; David C Lefroy; Darrel P Francis; Ajay M Shah; Rajesh Kharbanda; Divaka Perera; Riyaz S Patel; Jamil Mayet Journal: J Am Heart Assoc Date: 2020-03-26 Impact factor: 5.501