Case report: iatrogenic left ventricular outflow tract to right atrium fistula after trans-femoral transcatheter aortic valve implantation associated with asymmetric septal hypertrophy

BACKGROUND : The transcatheter aortic valve implantation (TAVI) is becoming a leading treatment option for symptomatic aortic stenosis for patients in all surgical risk categories. Recognition and management of potential complications are essential to ensure patient life and comfort. We present here a case report of a left ventricular outflow tract (LVOT) to right atrium (RA) fistula which is an extremely rare complication after TAVI. CASE SUMMARY : An 85-year-old man with symptomatic severe aortic stenosis and non-obstructive asymmetric septal hypertrophy (ASH) underwent a transfemoral TAVI. Soon after the procedure, he developed chest pain and atrial fibrillation with rapid ventricular response. A transthoracic echocardiography followed by a transoesophageal echocardiography showed a small pseudo-aneurysm with a fistulous tract between the LVOT and the RA. This was confirmed by a contrast computed tomography scan of the heart. The patient remained asymptomatic throughout the rest of hospitalization. He was treated with diuretics and discharged home. One month follow-up showed increase in the width, jet size, and gradient of the fistula but the patient remained asymptomatic. The decision by Heart team was to closely monitor him for symptoms since the fistula is difficult to access percutaneously. DISCUSSION : We report a unique case of an LVOT to RA fistula in the setting of ASH that occurred post-TAVI. Alcohol septal ablation was proposed pre-TAVI for patients having septal thickening >15 mm and dynamic obstruction. Treatment options for iatrogenic fistula vary from symptomatic treatment to percutaneous or surgical closure.