Prolonged Impella 5.5 Support in a Pediatric Patient With Genetic Cardiomyopathy.

Temporary mechanical circulatory support (tMCS) has been utilized as a bridge to heart transplantation with increasing duration of support. We describe the clinical course of a 14-year-old patient, with TNNT2 and KCNQ1 mutations, requiring Impella 5.5 support for 76 days. We discuss the patient's underlying genetic etiology, potential complications of prolonged tMCS, and the importance of multidisciplinary support. To our knowledge, this is the first published case in which a patient has this specific combination of genetic mutations and the longest published support duration of an Impella 5.5 in a pediatric patient.