title: Assessment of right ventricular function for patients with rheumatic mitral stenosis by 64-slice multi-detector row computed tomography: comparison with magnetic resonance imaging.
abstract: BACKGROUND
  Right ventricular (RV) dysfunction ensues due to rheumatic mitral stenosis (RMS). The evaluation of RV function is clinically important for the diagnosis, treatment, and follow-up for patients with different degrees of RMS. The purpose of this study was to determine whether the 64-slice multi-detector row computed tomography (64-slice MDCT) can assess the RV function in RMS with high accuracy and reproducibility when compared to MR imaging (MRI).
  
  
  METHODS
  Right ventricular end-diastolic and end-systolic volumes (RV-EDV and RV-ESV), stroke volume (RV-SV), ejection fraction (RV-EF), cardiac output (RV-CO), and wall mass (RV-Mass) were measured with dedicated cardiac analysis software on 64-slice MDCT and compared with values measured with MRI in 43 consecutive patients with RMS. Agreement between MRI and 64-MDCT results were compared with Bland and Altman analysis and linear regression analysis. Repeated measurements were performed to determine intraobserver and interobserver variability.
  
  
  RESULTS
  No significant differences were revealed in calculated RV function parameters between the two methods. RV-EDV, RV-ESV, RV-SV, RV-EF, RV-CO, and RV-Mass by 64-slice MDCT were similar to those by MRI (P > 0.05). There were good correlations (r = 0.98, 0.97, 0.96, 0.96, 0.95 and 0.77, respectively) and close agreement (bias = -0.2 ml, -1.0 ml, 0.8 ml, 0.5%, 26.1 ml, and 0.5 g, respectively, P > 0.05). The variability in 64-slice MDCT measurements was similar to that in MRI values.
  
  
  CONCLUSIONS
  ECG-gated 64-slice MDCT could assess the RV function in RMS with high accuracy and reproducibility when compared to MRI.
authors.affiliation: Department of Radiology, Southwest Hospital, the Third Military Medical University, Shapingba, Chongqing 400038, China.
authors.forename: Xiao-chun
authors.initials: XC
authors.lastname: Zhang
authors.forename: Zhi-gang
authors.initials: ZG
authors.lastname: Yang
authors.forename: Yin-kun
authors.initials: YK
authors.lastname: Guo
authors.forename: Rui-ming
authors.initials: RM
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Dai-quan
authors.initials: DQ
authors.lastname: Zhou
authors.forename: Lin
authors.initials: L
authors.lastname: Cheng
authors.forename: Lin
authors.initials: L
authors.lastname: Chen
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D008946:Mitral Valve Stenosis / Q000503:physiopathology*; D061330:Multidetector Computed Tomography / Q000379:methods*; D011446:Prospective Studies; D012214:Rheumatic Heart Disease / Q000503:physiopathology*; D016278:Ventricular Function, Right