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A 75-year-old man with atrial fibrillation was hospitalized because of shortness of breath triggered by upper respiratory infection and tachycardia. His symptoms were improved by bed rest and administration of diuretics. Pretreatment echocardiogram reported dilatation of the right ventricle (RV). Follow-up study was performed before discharge. Apical four-chamber view still demonstrated remarkable dilatation of RV (Fig. 1A). In one of the apical four-chamber views, the tricuspid valve showed a bridge-like appearance in systole without valve opening (Fig. 1B and C, Supplementary movie 1). The RV inflow view (Fig. 1D, E, and F, Supplementary movie 2) revealed localized small leaflet defect at posterior septum (Fig. 1D) with the opposing leaflet tip coapting against the RV wall (Fig. 1D). At the anterior side of the bridge, another valve orifice was observed in RV inflow view as well as parasternal short-axis views (Fig. 1G, H, and I, Supplementary movie 3). Color Doppler images in these views showed flow from the RV to right atrium across two orifices (Fig. 1F and I), suggesting double-orifice tricuspid valve.1),2) There was no pressure gradient across both orifices in diastole. Tricuspid regurgitation jet velocity of less than 3 m/s was observed from both orifices in systole. Three-dimensional transthoracic echocardiography clearly visualized double orifices (Fig. 2, Supplementary movie 4) and confirmed the diagnosis.

Double-Orifice Tricuspid Valve Visualized by Three-Dimensional Transthoracic Echocardiography