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Stroke distance in acute myocardial infarction: a simple measurement of left ventricular function
1Cardiac Department, Aberdeen Royal Infirmary.
Insights
Doppler ultrasound stroke distance measurement in acute myocardial infarction patients shows reduced left ventricular function. Lower stroke distance predicts higher mortality risk, offering prognostic value for patient outcomes.
Area of Science:
- Cardiology
- Diagnostic Ultrasound
Background:
- Acute myocardial infarction (AMI) significantly impairs left ventricular (LV) function.
- Monitoring LV function is crucial for managing AMI patients and predicting outcomes.
Purpose of the Study:
- To assess the utility of Doppler ultrasound-derived stroke distance for monitoring LV function post-AMI.
- To determine if stroke distance measurement has prognostic value in acute myocardial infarction.
Main Methods:
- Stroke distance was measured using Doppler ultrasound in 100 consecutive AMI patients.
- Measurements were taken during the first 10 days post-infarction and correlated with clinical data.
Main Results:
- Mean stroke distance was 72% of normal on days 1-5 post-AMI, increasing to 77% by days 6-10.
- Lower stroke distance was observed after anterior compared to inferior infarctions.
- A significant negative correlation was found between stroke distance and peak serum aspartate aminotransferase levels (r = 0.47, p < 0.001).
- Patients with stroke distance <50% of normal on days 1-5 had a higher mortality rate (4/16) compared to those with stroke distance ≥50% (1/84).
Conclusions:
- Bedside Doppler ultrasound measurement of stroke distance is a practical method for assessing LV function in AMI.
- Stroke distance measurement shows significant prognostic value, identifying patients at higher risk of mortality after myocardial infarction.
Abstract:
Stroke distance was measured by means of doppler ultrasound in 100 consecutive patients with acute myocardial infarction. Mean stroke distance on days 1-5 after infarction was 72% of the predicted normal value for age and rose to 77% of normal by days 6-10. Stroke distance was lower after anterior (65%) than inferior infarction (75%), and was negatively correlated with peak serum aspartate aminotransferase (r = 0.47, p less than 0.001). Of 16 patients whose stroke distance on days 1-5 was below 50% of normal for age, 4 died, all within the first week. Of 84 patients whose stroke distance was 50% of normal or higher, only 1 died (at 13 days). The simple bedside measurement of stroke distance offers a practical method of monitoring left ventricular function in acute myocardial infarction: the measurement may have prognostic value.