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BackgroundAtrial fibrillation (AF) can be a risk factor for development of significant tricuspid regurgitation (TR). We investigated which clinical and echocardiographic parameters were related to severity of functional TR in patients with lone AF.MethodsA total of 89 patients with lone AF were enrolled (75 ± 11 years; 48% male): 13 patients with severe TR, 36 patients with moderate TR, and 40 consecutive patients with less than mild TR. Clinical parameters and echocardiographic measurements including right ventricular (RV) remodeling and function were evaluated.ResultsPatients with more severe TR were older and had more frequently persistent AF (each p < 0.001). TR severity was related to right atrial area and tricuspid annular systolic diameter (all p < 0.001). The patients with moderate or severe TR had larger left atrial (LA) volume and increased systolic pulmonary artery pressure (SPAP) than the patients with mild TR (p = 0.04 for LA volume; p < 0.001 for SPAP). RV remodeling represented by enlarged RV area and increased tenting height was more prominent in severe TR than mild or moderate TR (all p < 0.001). Multivariate analysis showed type of AF, LA volume, tricuspid annular diameter and tenting height remained as a significant determinants of severe TR. In addition, tenting height was independently associated with the presence of severe TR (p = 0.04).ConclusionIn patients with lone AF, TR was related to type of AF, LA volume, tricuspid annular diameter and RV remodeling. Especially, tricuspid valvular tethering seemed to be independently associated with development of severe functional TR.

Purpose The purpose of this paper is to examine whether the sharing of movie trailers on video-sharing social media has an impact on box-office revenue. Design/methodology/approach From December 2013 to November 2014, view statistics were collected for movie trailers from YouTube and matched with the box-office revenue of the relevant movies from Box Office Mojo. Based on the 72 sample movies, a panel simultaneous equation model was applied. Findings The results show that sharing of a movie trailer has a positive impact on the box-office revenue of the movie, and this effect is greater in the early stage of a movie release than in the later stage. Research limitations/implications This study analyzes, from electronic word-of-mouth (eWOM) and social influence perspectives, the effects of video-sharing activities on social media and their impact on sales with an example that is representative of entertainment goods or movie trailers. Practical implications This study reveals that promotion through video-sharing social media websites can serve as an essential marketing tool for entertainment goods such as movies, while the sharing of a movie trailer has a positive influence on the box-office revenue of the movie. Originality/value Focusing on the sharing features of video-sharing social media websites, this study contributes to enhancing our understanding of the predictive power of consumers’ video-sharing and expanding current research on eWOM and social influence.

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