eCite Digital Repository

Cost-effectiveness of computed tomographic angiography before reoperative coronary artery bypass grafting: a decision-analytic model


Gada, H and Desai, MY and Marwick, TH, Cost-effectiveness of computed tomographic angiography before reoperative coronary artery bypass grafting: a decision-analytic model, Circulation: Cardiovascular Quality and Outcomes, 5, (5) pp. 705-710. ISSN 1941-7705 (2012) [Refereed Article]

Copyright Statement

copyright 2012 American Heart Association

DOI: doi:10.1161/circoutcomes.112.966465


Background—The risks of repeat thoracotomy can be reduced if thoracic multidetector computed tomographic angiography (CTA) is used to guide preventive surgical strategies (PSS: peripheral cardiopulmonary bypass, circulatory arrest, and nonmedian sternotomy). We sought to define the cost-effectiveness of CTA using a Markov model.
Methods and Results—We studied outcomes and costs of CTA and non-CTA strategies in a modeled cohort of 10 000 patients undergoing redo coronary artery bypass grafting. Rates of PSS implementation were anticipated to follow identification of risk by CTA. Transitions, costs, and utilities were informed by our experience and the literature. Sensitivity analyses included testing a range of costs of CTA and PSS on model outcome. In the reference case, cost and quality-adjusted life years accrued with the use of CTA ($74 869, 4.63 quality-adjusted life-years) were slightly higher than nonuse ($73 471, 4.59 quality-adjusted life-years), yielding an incremental cost-effectiveness ratio of $34 950/quality-adjusted life-years. Cost of PSS (equipment and operating time) was the most significant determinant of incremental cost-effectiveness ratio. In the reference case (cost of CTA ≈$300), identification and avoidance of potential procedural difficulties with CTA rendered it cost-effective if the cost of PSS was <$12 000. Across a range of CTA costs, incremental cost-effectiveness ratio was not materially influenced by outcomes across a broad range of imputed values.
Conclusions—The cost of CTA appears justified in the setting of isolated reoperative coronary artery bypass grafting, because it aids in appropriate selection of PSS. The cost-effectiveness of this imaging seems more influenced by the costs of subsequent PSS than by the cost of CTA.

Item Details

Item Type:Refereed Article
Keywords:cost-effectiveness, computed tomography (multidetector), coronary artery bypass grafting
Research Division:Biomedical and Clinical Sciences
Research Group:Cardiovascular medicine and haematology
Research Field:Cardiology (incl. cardiovascular diseases)
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Marwick, TH (Professor Tom Marwick)
ID Code:91183
Year Published:2012
Web of Science® Times Cited:6
Deposited By:Menzies Institute for Medical Research
Deposited On:2014-05-09
Last Modified:2014-12-15

Repository Staff Only: item control page