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Coronary recanalization in anterior myocardial infarction: the open perforator hypothesis
Paolo Voci1, Enrica Mariano, Francesco Pizzuto
1Section of Cardiology, La Sapienza University, Rome, Italy. voci@uniroma1.it
Insights
Patent perforators visualized by color-Doppler ultrasound are effective noninvasive markers for assessing myocardial reperfusion after anterior myocardial infarction (MI). This new recanalization score (RS) better predicts ventricular function recovery than TIMI flow.
Area of Science:
- Cardiovascular Imaging
- Myocardial Infarction Research
- Echocardiography Applications
Background:
- The Thrombolysis In Myocardial Infarction (TIMI) classification has limitations in fully assessing myocardial reperfusion post-MI.
- Patent perforators visualized via transthoracic color-Doppler echocardiography may indicate adequate reperfusion in anterior myocardial infarction (MI).
Purpose of the Study:
- To evaluate the utility of patent perforators and a novel recanalization score (RS) in assessing myocardial reperfusion and ventricular function recovery after anterior MI.
- To compare the efficacy of RS with the traditional TIMI flow in predicting functional recovery.
Main Methods:
- Sixty-one patients with anterior MI underwent assessment using high-resolution color-Doppler ultrasound to image the left anterior descending coronary artery (LAD) and perforators.
- A new recanalization score (RS) was developed and compared against TIMI flow assessed by angiography.
- Echocardiographic parameters including wall motion score index (WMSI) and ejection fraction (EF) were measured at baseline and three-month follow-up.
Main Results:
- Color-Doppler ultrasound demonstrated high accuracy (97%) in detecting LAD patency.
- The recanalization score (RS) was a superior predictor of ventricular function recovery (WMSI, EF, ESVI) compared to TIMI flow (p < 0.012).
- RS emerged as the best single multivariate predictor for functional recovery (p < 0.0001).
Conclusions:
- Transthoracic color-Doppler ultrasound effectively identifies an open LAD post-MI.
- Patent perforators serve as early, noninvasive indicators of myocardial viability and adequate reperfusion.
- The developed recanalization score (RS) offers a more accurate assessment of myocardial reperfusion and functional recovery than TIMI flow.
Objective:
Patent perforators, noninvasively imaged by transthoracic color-Doppler echocardiography, may reflect adequate reperfusion in anterior myocardial infarction (MI).
Background:
The Thrombolysis In Myocardial Infarction (TIMI) classification may not fully reflect adequate myocardial reperfusion in MI.
Methods:
We studied 61 patients with anterior MI undergoing thrombolysis (n = 28), primary stenting (n = 20), or neither one (n = 13). High-resolution color-Doppler ultrasound was used to image the left anterior descending coronary artery (LAD) and perforators in four segments of the anterior-apical wall and to build a new recanalization score (RS). The TIMI flow was assessed by angiography. Wall motion score index (WMSI), ejection fraction (EF), end-diastolic volume index, and end-systolic volume index (ESVI) were measured by echocardiography at baseline and at three-month follow-up. Linear regression equations, considering RS or TIMI flow as independent variables, were compared among these functional recovery parameters. A multivariate linear model, predicting percent changes of WMSI, EF, or ESVI, was used to investigate the contribution of several clinical covariates along with RS and TIMI flow.
Results:
Sensitivity, specificity, and diagnostic accuracy of color-Doppler ultrasound in detecting LAD patency were 86%, 98%, and 97%, respectively. Mean and peak flow velocities discriminated (0.004 < p < 0.008) TIMI flow but not RS. Regression equations showed that RS discriminated better than TIMI flow recovery of ventricular function (p < 0.012). The RS was the best single multivariate predictor (p < 0.0001) of percent changes in WMSI, EF, and ESVI.
Conclusions:
Transthoracic color-Doppler ultrasound detects an open LAD after MI. Perforators reflect adequate myocardial reperfusion and are early noninvasive markers of myocardial viability.