[Tricuspid endocarditis with right-left shunt in the atrium].

A case of tricuspid regurgitation due to endocarditis causing a right-to-left shunt through a patent foramen ovale is reported. Tricuspid valve endocarditis occurred after septic abortion and caused valvular regurgitation with dyspnea and cyanosis. The diagnosis was made by echocardiography and the finding of peripheral arterial desaturation, and it was confirmed at surgery. The physiopathology of these right-to-left shunts is the same as that already described during traumatic tricuspid regurgitation: reopening of the foramen ovale by the right atrial dilatation and ventricularisation of right atrial pressures. The presence of a shunt is an indication for surgery.