title: Motion analysis of right ventricular dysfunction under mild or moderate pressure overload caused by acute pulmonary embolism.
abstract: Acute pulmonary embolism (APE) is the third most common cause of death in the United States. Appearing as a sudden blockage in a major pulmonary artery, APE may cause mild, moderate or severe right ventricular (RV) overload. Although severe RV overload produces diagnostically obvious RV mechanical failure, little progress has been made in gaining a clinical and biophysical understanding of moderate and mild acute RV overload and its impact on RV functionality. In the research described here, we conducted a pilot study in pigs using echocardiography and observed the following abnormalities in RV functionality under acute mild or moderate RV overload: (i) occurrence of paradoxical septal motion with "waving" dynamics; (ii) decrease in local curvature of the septum (p < 0.01); (iii) lower positive correlation between movement of the RV free wall and movement of the septum (p < 0.05); (iv) slower rate of RV fractional area change (p < 0.05); and (v) decrease in movement stability, particularly in the middle of the septum (p < 0.05).
authors: Department of Biomedical Informatics, Arizona State University, Scottsdale, Arizona, USA. Electronic address: Nima.Tajbakhsh@asu.edu.
authors: Nima
authors: N
authors: Tajbakhsh
authors: Hong
authors: H
authors: Wu
authors: Wenzhe
authors: W
authors: Xue
authors: Eileen M
authors: EM
authors: McMahon
authors: Marek
authors: M
authors: Belohlavek
authors: Jianming
authors: J
authors: Liang
mesh_terms: D000208:Acute Disease; D000465:Algorithms; D000818:Animals; D001794:Blood Pressure; D004453:Echoencephalography / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009068:Movement; D011655:Pulmonary Embolism / Q000150:complications / Q000000981:diagnostic imaging / Q000503:physiopathology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013552:Swine; D018497:Ventricular Dysfunction, Right / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology*
keywords: Active contours; Acute pulmonary embolism; Biomarker; Mild or moderate right ventricular pressure overload; Motion analysis; Paradoxical septal motion; Rate of right ventricular transverse fractional area change