2-2 Echocardiographic and fluoroscopic evaluations
All patients underwent transthoracic echocardiography (TTE) and
fluoroscopic examinations. The diagnosis of mechanical TV thrombosis was
made based on clinical presentation, physical examinations, and imaging
features on echocardiographic and/or fluoroscopic evaluations. The type
of mechanical TV thrombosis was considered obstructive when a high
trans-prosthetic pressure gradient was observed on TTE and reduced or
fixed leaflet mobility was detected by fluoroscopy. The cutoff values
for Doppler parameters were based on the latest recommendation. The TV
peak velocity ≥1.9 m/s, the mean of trans-tricuspid pressure gradient ≥6
mm Hg, and the pressure half time ≥130 ms were suggestive of possible
tricuspid prosthetic obstruction [2].