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Updated: Mar 28, 2026
Myocardial Infarction and Functional Outcome Assessment in Pigs
Published on: April 25, 2014
Temporal course of microvascular obstruction after myocardial infarction assessed by MRI
Nadine Abanador-Kamper1, Vasiliki Karamani, Lars Kamper
1Department of Cardiology, HELIOS Medical Center Wuppertal, University Hospital Witten/Herdecke, Wuppertal, Germany; Center for Clinical Medicine Witten/Herdecke University Faculty of Health, Wuppertal, Germany. nadine.abanador@helios-kliniken.de.
Purpose:
We aimed to analyze the extent of microvascular obstruction (MO) after the index event compared with the follow-up at a median of three months.
Methods:
We identified 31 patients with MO after primary percutaneous coronary intervention of acute myocardial infarction by cardiac magnetic resonance imaging. The initial examination was performed after the index event, and 27 patients had the follow-up exam after a median of three months (interquartile range, 2-4 months). In addition, we examined 10 patients without MO after transmural myocardial infarction, as a control group.
Results:
MO disappeared in 23 of 27 patients (85%) in the follow-up and transformed into transmural late gadolinium enhancement. In patients with persistent MO, mean MO size decreased from 2.25% to 1.25%. In patients with MO, mean infarct size decreased significantly from 20.8% to 14.7% (P < 0.001). In the control group, mean infarct size decreased from 12.7% to 10.5% in the follow-up scan (P = 0.137).
Conclusion:
MO is significantly reduced during the follow-up after acute myocardial infarction.
Insights
Microvascular obstruction (MO) significantly decreases after acute myocardial infarction. Most cases resolve, with remaining MO showing reduced size and infarct size reduction over three months.
Area of Science:
- Cardiology
- Cardiovascular Imaging
- Medical Research
Background:
- Microvascular obstruction (MO) is a key determinant of infarct size and adverse outcomes after acute myocardial infarction (AMI).
- Assessing the evolution of MO post-primary percutaneous coronary intervention (PCI) is crucial for understanding myocardial healing and recovery.
Purpose of the Study:
- To quantify the change in microvascular obstruction (MO) extent from the index event to a three-month follow-up in patients with AMI.
- To compare MO changes with infarct size evolution using cardiac magnetic resonance imaging (CMR).
Main Methods:
- Cardiac magnetic resonance imaging (CMR) was used to assess MO in 31 patients post-primary PCI for AMI.
- Follow-up CMR scans were obtained in 27 patients after a median of three months.
- Ten patients without MO served as a control group.
Main Results:
- Microvascular obstruction (MO) resolved in 85% of patients by follow-up, transforming into late gadolinium enhancement.
- In patients with persistent MO, the mean MO size decreased from 2.25% to 1.25%.
- Mean infarct size significantly decreased from 20.8% to 14.7% (P < 0.001) in patients with MO, while controls showed no significant change (12.7% to 10.5%, P = 0.137).
Conclusions:
- Microvascular obstruction (MO) undergoes significant reduction during the follow-up period after acute myocardial infarction.
- These findings highlight the dynamic nature of myocardial injury and healing post-AMI, with potential for substantial MO resolution.
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