P1246 The Eustachian valve: a structure not so innocent

Abstract

Abstract Background The eustachian valve is an embryological remnant of the inferior vena cava (IVC) valve. It is usually absent or inconspicuous and has no known function in the normal adult. However, there are reports suggesting that the EV is not as innocent as we thought. The EV can be a site of infective vegetations or be mistaken for a thrombus or tumor. The EV can also make interventional procedures (closure of ASD (atrial septal defect) or ablation for atrial flutter) more laborious. Clinical Case A 80 year-old female patient was referred to the emergency department after an episode of acute palpitations, right chest pain, followed by syncope. She had a previous medical history of type 2 diabetes and epilepsy. On admission she was normotensive (104/67mmHg). The ECG showed atrial fibrillation with heart rate of 180 beats per minute. The echocardiogram show slight dilation of the right ventricle and bilateral atrial dilatation. The blood tests documented an elevated D-dimers 2,73 μg/mL, troponin (hs-TNT 27ng/L) and NT-proBNP 4339pg/ml, with a normal renal function. Computed tomographic (CT) pulmonary angiography revealed filling defects on the segmentar and subsegmentar inferior lobes, compatible with the diagnosis of pulmonary embolism and also revealed a dilatation of the main pulmonary trunk (35mm). Based on this result the patient start anticoagulation with low molecular weight heparin and heart rate control with bisoprolol. However besides of this strategy the patient remain in atrial fibrillation without a controlled hear rate and an transesophageal echocardiography (TOE) was performed. The TOE shown a small freely mobile mass – thombi - at the inferior vena cava-right atrium (IVC-RA) junction tethered at the eustachian valve; a small atrial septal defect (4mm) – ostium secundum type – with a left to right shunt; and a preserved biventricular function (figure 1). Based on this exams we optimize the therapy with digoxin and amiodarone with a good control of the heart rate and patient was discharge on warfarine, bisoprolol and digoxin asymptomatic and to be reevaluated on cardiology clinic. Discussion/Conclusion: The eustachian valve in adult is an embryological remainder of the fetal venous sinus valve. This structure is located in the right atrium and is a common, not pathological, echocardiographic finding. It is known that a small percentage of the pulmonary embolisms, thrombi are discovered in the right side of the heart; however, their presence on the Eustachian valve is very unusual. Besides this in our particular case in the present we will have also to ensure that the anticoagulation is effective to avoid that the trombi migrates into the systemic circulation by the atrial septal defect. Abstract P1246 Figure.