Related Experiment Videos
Coronary microcirculation during left heart bypass with a centrifugal pump
1Second Department of Surgery, Nihon University School of Medicine, Tokyo, Japan.
Insights
Left heart bypass (LHB) improved myocardial microcirculation more effectively than intraaortic balloon pumping (IABP) in a swine model. LHB significantly increased endocardial flow and reduced left ventricular end-diastolic pressure.
Area of Science:
- Cardiovascular Physiology
- Surgical Devices
Background:
- Assessing coronary microcirculation is crucial for managing cardiogenic shock.
- Left heart bypass (LHB) and intraaortic balloon pumping (IABP) are mechanical circulatory support methods.
- Comparing their efficacy in improving myocardial perfusion is clinically significant.
Purpose of the Study:
- To compare the effects of LHB and IABP on coronary microcirculation.
- To evaluate the impact of these interventions on myocardial blood flow and left ventricular pressures.
Main Methods:
- Experimental study in a swine model comparing LHB and IABP.
- LHB supported half cardiac output; IABP used 1:1 mode.
- Coronary circulation assessed using electromagnetic flowmetry, pulsed Doppler, and laser Doppler flowmetry.
Main Results:
- LHB significantly reduced left ventricular end-diastolic pressure (LVEDP).
- LHB significantly increased endocardial flow compared to IABP.
- LHB notably reduced myocardial invalid circulation (systolic reverse wave).
- A significant inverse correlation was found between endocardial flow and LVEDP.
Conclusions:
- LHB demonstrates superior effectiveness in enhancing myocardial microcirculation compared to IABP.
- LHB's ability to reduce LVEDP is linked to improved endocardial blood flow.
- These findings suggest LHB as a potentially more beneficial intervention for myocardial perfusion in shock states.
Abstract:
To estimate coronary microcirculation during left heart bypass (LHB), we performed an experimental comparison study of LHB and intraaortic balloon pumping (IABP). LHB was performed with a BioMedicus BP-80 pump supporting half of the flow of cardiac output whereas the IABP was pumped in a 1:1 mode for cardiogenic shock in a swine model. Coronary circulations were analyzed by electromagnetic flowmeter, pulsed Doppler velocimeter, and laser Doppler flowmeter. Left ventricular end-diastolic pressure (LVEDP) was reduced significantly by LHB. Although there was no significant difference in epicardial flow between the LHB and IABP groups, endo cardial flow was increased significantly by LHB. In the LHB group, the systolic reverse wave of the coronary velocity called a myocardial invalid circulation was reduced remarkably. There was a significant inverse correlation between endocardial flow and LVEDP. These results suggested that LHB was more effective for myocardial microcirculation than was IABP.