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

Young Joo Suh, Young Jin Kim, Yoo Jin Hong, Hye Jeong Lee, Jin Hur, Dong Jin Im, Yun Jung Kim, Byoung Wook Choi

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 dualsource 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° in seven types of valves, 11.0° in On-X valves, and 15.5° 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.

Original languageEnglish
Pages (from-to)1012-1023
Number of pages12
JournalKorean journal of radiology
Volume16
Issue number5
DOIs
Publication statusPublished - 2015 Sep 1

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

Fingerprint Dive into the research topics of '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'. Together they form a unique fingerprint.

  • Cite this