Coronary microembolization causes long-term detrimental effects on regional left ventricular function
Marcus Carlsson1, Robert Jablonowski, Alastair J Martin
1Department of Clinical Physiology, Lund University, Skåne University Hospital, Lund, Sweden. Marcus.carlsson@med.lu.se
Scandinavian Cardiovascular Journal : SCJ
|April 6, 2011
Summary
Coronary microemboli cause lasting damage to left ventricular function, even small ones. Comprehensive MRI protocols are essential for detecting these microinfarcts and assessing cardiac impact.
Area of Science:
- Cardiovascular Research
- Medical Imaging
- Experimental Pathology
Background:
- Coronary microemboli are implicated in cardiac dysfunction.
- Long-term effects of microemboli on left ventricular (LV) function require further investigation.
- Differentiating impacts of small versus large microemboli is crucial for understanding cardiac injury.
Purpose of the Study:
- To assess the long-term effects of coronary microemboli on LV function in an experimental model.
- To compare first-pass perfusion and late gadolinium enhancement (LGE) patterns between small and large microemboli.
- To establish the necessity of comprehensive MRI protocols for microinfarct detection.
Main Methods:
- Six pigs underwent left anterior descending (LAD) coronary microembolization with small (40-120 μm) or large (100-300 μm) microemboli.
- Serial MRI scans were performed before, 1 hour after, and 7-8 weeks after microembolization.
- Histopathology confirmed microinfarcts.
Main Results:
- An acute drop in ejection fraction (EF) post-microembolization substantially recovered within 7-8 weeks.
- Regional LV function declined in microinfarct and remote areas, with partial recovery observed.
- Small and large microemboli induced similar acute LV dysfunction and perfusion deficits; perfusion significantly recovered over time.
- Late gadolinium enhancement (LGE) visualized microinfarcts at 7-8 weeks but not acutely.
Conclusions:
- Microembolization leads to long-term regional LV dysfunction.
- A comprehensive MRI protocol is vital for detecting microinfarcts.
- Even small microemboli (40-120 μm) can impact cardiac function, potentially evading protective devices.
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