Impact of Left Ventricular Unloading on Hemodynamics and Stunning in Complex PCI: A CHIP-BCIS3 Substudy

Area of Science:

• Cardiology
• Interventional Cardiology
• Cardiovascular Research

Background:

• High-risk percutaneous coronary intervention (PCI) can lead to hemodynamic instability and myocardial stunning.
• Elective left ventricular (LV) unloading is a potential strategy to mitigate these complications.
• Previous studies have not evaluated LV unloading in a randomized trial setting.

Purpose of the Study:

• To evaluate the efficacy of elective LV unloading with a microaxial flow pump (mAFP) in reducing hemodynamic instability and postprocedural myocardial stunning during complex PCI.
• To assess the impact of mAFP on key hemodynamic parameters and myocardial injury markers.

Main Methods:

• A randomized controlled trial (CHIP-BCIS3) comparing elective LV unloading with mAFP versus standard care in patients with severe LV systolic dysfunction undergoing complex PCI.
• Invasive hemodynamic monitoring via pulmonary artery catheterization.
• Coprimary outcomes included systolic blood pressure reduction, loss of pulse pressure (LOPP), and inotrope requirement; secondary outcomes included cardiac index, LV filling pressure, and peri-procedural myocardial injury.

Main Results:

• The incidence of systolic blood pressure reduction was similar between groups.
• Inotrope use was significantly lower in the mAFP group.
• Loss of pulse pressure (LOPP) was more frequent in the mAFP group and was associated with peri-procedural myocardial injury.
• Changes in cardiac index and pulmonary capillary wedge pressure were comparable between groups.

Conclusions:

• Elective LV unloading with mAFP in high-risk PCI patients reduced the need for inotropes.
• However, mAFP increased LOPP and did not prevent myocardial stunning.
• Further research is needed to optimize LV unloading strategies in complex PCI.