Microaxial Flow Pumps for Cardiogenic Shock: Effects on Hemodynamics, Hemolysis, and End-Organ Recovery

Background. Te Impella 5.5 ofers a less invasive transvalvular approach to left ventricular mechanical support. End-organ recovery and hemolysis have been well-studied with durable left ventricular assist devices but efects of Impella 5.5 on these parameters are less well described. Methods. All Impella 5.5 recipients between August 2020 and June 2023 were reviewed from a single institution. Hemodynamics and laboratory values were compared between preimplant and prior to device removal. Hemolysis was defned as postoperative lactate dehydrogenase >1000 IU/L with concurrent plasma-free hemoglobin >50 mg/dL. Paired Wilcoxon tests compared the median of diferences between preimplant and pre-explant values. Results. We studied 127 consecutive implants of the Impella 5.5. Tirty-one patients had concomitant VA-ECMO, and one received Impella 5.5 after durable LVAD explant; these cases were excluded. Our fnal cohort included 95 patients, with an average age of 55.29 ± 14.5 years. Median implant duration was 11 days (IQR:6–16 days). To avoid confounding hemodynamic factors, we restricted hemodynamic analysis to the 37 patients who received isolated Impella 5.5, excluding those with prior IABP, Impella CP, acute MI, or prior cardiac surgery. Tese patients experienced improvements from baseline in pulmonary vascular resistance (−77.03 dynes/sec/ cm⁻⁵, p < 0.01) and wedge pressure (−6.5 mmHg, p < 0.01). Furthermore, cardiac index improved from baseline (+1.3, p < 0.01). In the total cohort (n = 95), pre-explant creatinine (−0.2 mg/dL, p < 0.01) and ALT (−9.0 mg/dL, p < 0.01) decreased relative to values before the implant. Twenty-three (24%) met criteria for hemolysis; however, none underwent device removal for clinically signifcant hemolysis. Takeback was required in 25 patients, 22 of which were for axillary hematoma. Conclusions. Impella 5.5 support acutely improved markers of end-organ function and hemodynamics, including PVR.

Duke Scholars

Author Stuart Dean Russell Medicine, Cardiology

Author Jacob Niall Schroder Surgery, Cardiovascular and Thoracic Surgery

Author Carmelo Alessio Milano Surgery, Cardiovascular and Thoracic Surgery

Author Christopher Jensen