Related Experiment Video
Updated: Aug 3, 2026
Myocardial Infarction and Functional Outcome Assessment in Pigs
Published on: April 25, 2014
Role of infarction artery status in left ventricular remodeling after acute myocardial infarction
Insights
Regional dysfunction extent is the main driver of left ventricular volumes post-myocardial infarction. Infarction artery status weakly predicts volumes, but poor collateral flow indicates larger end-systolic volume.
Area of Science:
- Cardiology
- Cardiovascular Imaging
- Myocardial Infarction Research
Background:
- Left ventricular (LV) volumes are crucial indicators of cardiac remodeling after myocardial infarction (MI).
- Understanding the relationship between coronary artery status and LV volumes, independent of regional dysfunction, is vital for predicting outcomes.
Purpose of the Study:
- To evaluate the association between infarction artery status and LV volumes (end-diastolic and end-systolic) 4-6 weeks after a first MI.
- To determine the independent contribution of regional ventricular dysfunction and infarction artery characteristics to LV volumes.
Main Methods:
- Coronary and left ventricular angiograms were performed in 100 patients 4-6 weeks post-MI.
- Left ventricular volumes were measured, and wall motion abnormality (WMA) extent and severity were calculated using the centerline chord method.
- Infarction artery status was assessed by minimum lumen diameter, patency, and collateral flow, categorizing patients into four groups based on occlusion and collateralization.
Main Results:
- Patients with infarction artery occlusion and poor collateral flow exhibited significantly greater WMA extent and severity, and larger LV end-diastolic and end-systolic volumes.
- Multivariate analysis identified WMA extent as the primary determinant of both LV end-diastolic and end-systolic volumes.
- Occlusion with poor collateral flow independently predicted larger end-systolic volumes, while total occlusion and minimum lumen diameter did not correlate with LV volumes.
Conclusions:
- The extent of regional left ventricular dysfunction is the principal determinant of LV volumes 4-6 weeks after myocardial infarction.
- Infarction artery status is a weak predictor of LV end-diastolic volume, but occlusion with poor collateral flow is associated with larger end-systolic volumes, suggesting impaired ventricular remodeling.
Abstract:
The aim of this study was to evaluate the relation between the infarction artery status and left ventricular volumes, independently of regional ventricular dysfunction, at 4-6 weeks after a first myocardial infarction. The study group consisted of 100 patients, of whom 80 received thrombolytic treatment. Coronary and contrast left ventricular angiograms were performed at 36+/-5 days postinfarction. Left ventricular end-diastolic and end-systolic volumes were measured. The centerline chord motion method was used to calculate the extent of wall motion abnormality (percentage of chords with hypokinetic motion) and its severity (maximum units of S.D. below the normal wall motion reference). Minimum lumen diameter, patency and collateral flow in the infarction artery were also analyzed. Eight patients (group I) showed occlusion with poor collateral flow in the infarction artery, 22 patients (group II) occlusion with good collateral flow, 38 patients (group III) severe residual stenosis (minimum lumen diameter < or = 1 mm), and 32 patients (group IV) non-severe residual stenosis (minimum lumen diameter > 1 mm). Patients from group I presented greater wall motion abnormality in terms of both extent (P=0.005) and severity (P=0.007), and greater end-diastolic (P=0.07) and end-systolic (P=0.0008) volumes; there were no differences among groups II, III and IV. By stepwise multivariate regression analysis, the extent of wall motion abnormality was the main determinant of end-diastolic (P=0.0001) and end-systolic (P=0.0001) volumes; occlusion with poor collateral flow was also a significant independent factor for end-systolic volume (P=0.03). Total occlusion (including both with and without collaterals) and the minimum lumen diameter did not correlate with end-diastolic and end-systolic volumes. We concluded that (A) the extent of regional dysfunction is the primary determinant of left ventricular volumes at 4-6 weeks postinfarction. (B) The status of the infarction artery is a weak predictor of end-diastolic volume, which is the best descriptor of ventricular remodeling, although occlusion with poor collateral flow is associated to larger end-systolic volume.
