Related Experiment Videos
[Effects of PTCR and PTCA on serial changes in left and right ventricular wall motion in acute myocardial infarction]
A Takarada1, H Kurogane, M Fujino
1Himeji Cardiovascular Center.
Insights
Early recanalization significantly improves left ventricular wall motion in acute myocardial infarction (AMI) patients. Achieving reperfusion within 4 hours of symptom onset yields the greatest recovery of heart function.
Area of Science:
- Cardiology
- Medical Imaging
Context:
- Acute myocardial infarction (AMI) poses significant risks to cardiac function.
- Left and right ventricular wall motion are critical indicators of heart health post-AMI.
Purpose:
- To assess the impact of early recanalization on ventricular wall motion in AMI patients.
- To compare the effectiveness of spontaneous versus interventional recanalization strategies.
Summary:
- Patients with spontaneous or early interventional recanalization (within 6 hours) showed improved left ventricular wall motion abnormality indexes (LV-WMAI) compared to those without.
- Reperfusion within 2-4 hours of symptom onset resulted in significantly greater improvement in LV-WMAI by day 28 compared to recanalization between 4-6 hours.
Impact:
- Early reperfusion therapy is crucial for preserving myocardial function in AMI.
- Timely intervention, particularly within the first 4 hours, maximizes recovery of left ventricular function.
Abstract:
To evaluate the effects of early recanalization on left and right ventricular wall motion in acute myocardial infarction (AMI), we serially observed their degrees in 66 patients with AMI. The patients were categorized as Group 1:17 with spontaneous recanalization within 6 hours of onset of the chest pain; Group 2:34 with effective recanalization within 6 hours (10 by PTCR, 10 by PTCR+ PTCA, and 14 by direct PTCA), and Group 3:21 without effective recanalization. The Group 2 patients were classified in 3 subgroups according to the time intervals from onset of symptoms to recanalization; 11 patients with recanalization within 2 hours (Group 2a), 10 between 2 and 4 hours (Group 2b), and 13 between 4 and 6 hours (Group 2c). The left and right ventricular wall motion abnormality indexes (WMAI) were defined as the means of point scores for the degrees of regional wall motion abnormality at 11 segments of the left ventricle and seven segments of the right ventricle on serial two-dimensional echocardiograms. Results were as follows: 1. The LV-WMAI of Group 1 was smaller on day 1, and improved on day 28 as compared to those of the other groups (0.63 +/- 0.35 to 0.18 +/- 0.18, p less than 0.001). 2. The improvements of the LV-WMAI from days 1 to 28 in Group 2a (WMAI: 1.01 +/- 0.57 to 0.26 +/- 0.26, delta WMAI: 82 +/- 14%) and Group 2b (1.03 +/- 0.38 to 0.52 +/- 0.48, 54 +/- 36%) were greater than that in Group 2c (1.01 +/- 0.46 to 0.64 +/- 0.52, 38 +/- 47%).(ABSTRACT TRUNCATED AT 250 WORDS)