Author + information
Right ventricle (RV) dysfunction has important prognostic implications but complex three dimensional (3D) anatomy limits accuracy of two dimensional (2D) evaluation. Cardiac computed tomography (CCT) has the unique advantage of allowing for simultaneous analysis of both 3D data and 2D images from any angle. We sought to determine the effect of differing image angles on 2D RV analysis by CCT and compare transthoracic echocardiography (TTE) with CCT.
410 consecutive CCT patients were assessed for concomitant CCT and TTE. CCT was used to construct 2D apical 4 chamber (A4C) views with rotation over left ventricle (LV) long axis to simulate traditional 2D TTE views from which 2D RV dimension and fractional area change (FAC) were determined. Analyses were done at 4 different angles of rotation (see table). Statistical analysis done with t test and Chi square analysis.
165 patients had concomitant CCT and TTE. Excluded were 42 for suboptimal TTE, 5 with missing CCT data and one with photopenia. By CCT analysis, RV dimensions and FAC were highly angle dependent (see table). Angle of 2D analysis also had major effect on classification (see table). These differences were more marked with dysfunctional RVs. 2D TTE had modest accuracy for detecting RV enlargement and function (respectively 79% and 81%) compared with CCT.
RV analysis by 2D techniques is highly dependent on angle of acquisition. Dedicated 3D imaging modalities should be used for RV analysis.
Poster Sessions, Expo North
Saturday, March 09, 2013, 3:45 p.m.-4:30 p.m.
Session Title: Imaging: Echo: RV Imaging
Abstract Category: 20. Imaging: CT/Multimodality
Presentation Number: 1179-333
- 2013 American College of Cardiology Foundation