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http://dx.doi.org/10.3348/kjr.2015.16.5.1012

Measurement of Opening and Closing Angles of Aortic Valve Prostheses In Vivo Using Dual-Source Computed Tomography: Comparison with Those of Manufacturers' in 10 Different Types  

Suh, Young Joo (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine)
Kim, Young Jin (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine)
Hong, Yoo Jin (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine)
Lee, Hye-Jeong (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine)
Hur, Jin (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine)
Im, Dong Jin (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine)
Kim, Yun Jung (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine)
Choi, Byoung Wook (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine)
Publication Information
Korean Journal of Radiology / v.16, no.5, 2015 , pp. 1012-1023 More about this Journal
Abstract
Objective: The aims of this study were to compare opening and closing angles of normally functioning mechanical aortic valves measured on dual-source computed tomography (CT) with the manufacturers' values and to compare CT-measured opening angles according to valve function. Materials and Methods: A total of 140 patients with 10 different types of mechanical aortic valves, who underwent dual-source cardiac CT, were included. Opening and closing angles were measured on CT images. Agreement between angles in normally functioning valves and the manufacturer values was assessed using the interclass coefficient and the Bland-Altman method. CT-measured opening angles were compared between normal functioning valves and suspected dysfunctioning valves. Results: The CT-measured opening angles of normally functioning valves and manufacturers' values showed excellent agreement for seven valve types (intraclass coefficient [ICC], 0.977; 95% confidence interval [CI], 0.962-0.987). The mean differences in opening angles between the CT measurements and the manufacturers' values were $1.2^{\circ}$ in seven types of valves, $11.0^{\circ}$ in On-X valves, and $15.5^{\circ}$ in ATS valves. The manufacturers' closing angles and those measured by CT showed excellent agreement for all valve types (ICC, 0.953; 95% CI, 0.920-0.972). Among valves with suspected dysfunction, those with limitation of motion (LOM) and an increased pressure gradient (PG) had smaller opening angles than those with LOM only (p < 0.05). Conclusion: Dual-source cardiac CT accurately measures opening and closing angles in most types of mechanical aortic valves, compared with the manufacturers' values. Opening angles on CT differ according to the type of valve dysfunction and a decreased opening angle may suggest an elevated PG.
Keywords
Mechanical aortic valve; Opening and closing angles; Measurement; Dual-source computed tomography;
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