Hemodynamic Response after Intra-aortic Balloon Counter-Pulsation in Cardiac Amyloidosis and Cardiogenic Shock

Background

In those with heart failure-related cardiogenic shock (HF-CS), an intra-aortic balloon pump (IABP) may improve hemodynamics and be useful as a bridge to advanced therapies. We explore whether those with cardiac amyloidosis and HF-CS might experience hemodynamic improvement and describe the hemodynamic response after IABP.

Methods and Results

We retrospectively identified consecutive patients with a diagnosis of cardiac amyloid, either light chain or transthyretin, who were admitted to our intensive care unit with HF-CS. Patients were excluded if an IABP was placed during heart transplant or for shock related to acute myocardial infarction. Invasive hemodynamics before and after IABP placement were assessed. We identified 23 patients with cardiac amyloid who had an IABP placed for HF-CS. The 1-year survival rate was 74% and most (65%) were bridged to heart transplant, although 1 patient was bridged to destination left ventricular assist device. After IABP, the mean arterial pressure, cardiac index, and cardiac power index were significantly increased, whereas mean right atrial pressure, mean pulmonary artery pressure, and pulmonary capillary wedge pressure were all significantly decreased. A smaller left ventricular end-diastolic diameter (per cm) was associated with a higher likelihood of a cardiac index of <2.2 L/min/m² after IABP (odds ratio 0.16, 95% confidence interval 0.01–0.93, P = .04).

Conclusions

IABP significantly improved cardiac index while decreasing right atrial pressure, mean pulmonary artery pressure, and pulmonary capillary wedge pressure in cardiac amyloidosis patients with HF-CS.