Background
Impella 5.0 is currently used as a temporary mechanical circulatory support device in cardiogenic shock. However, Impella 5.0 implantation for the systemic right ventricle has not been well documented.
Case summary
A 50-year-old man with atrial switch for dextro-transposition of the great arteries was transferred to our hospital for the treatment of embolic acute myocardial infarction of the left main trunk lesion with cardiogenic shock. To stabilize hemodynamics, we implanted Impella 5.0 via the left subclavian artery in the systemic right ventricle. After optimal medical therapy initiation and gradual weaning of Impella 5.0, Impella 5.0 was successfully explanted. An electrocardiogram was obtained, which showed complete right branch block with a QRS duration of 172 ms. Acute invasive hemodynamic evaluation of cardiac resynchronization therapy pacing showed that dP/dt increased from 497 mmHg/s to 605 mmHg/s (21.7% improvement), and hybrid cardiac resynchronization therapy-D with a systemic right ventricle epicardial lead was subsequently implanted. The patient was discharged without inotropic support.
Discussion
Coronary artery embolism is a rare but serious complication of dextro-transposition of the great arteries after atrial switch operations. Impella 5.0 implantation is a feasible bridge strategy for refractory cardiogenic shock due to systemic right ventricle failure. Although cardiac resynchronization therapy implantation in patients with systemic right ventricle is controversial, an acute invasive hemodynamic evaluation can help assess its potential benefits.