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Predictive value of pulsed Doppler echocardiography in acute myocardial infarction
B J Delemarre1, C A Visser, H Bot
1Department of Cardiology, Academic Medical Center, Amsterdam, The Netherlands.
Insights
Early Doppler echocardiography can predict heart failure severity after myocardial infarction. Systolic function and apical flow patterns accurately identify patients with mild heart failure, unlike transmitral flow ratios.
Area of Science:
- Cardiology
- Echocardiography
- Acute Myocardial Infarction
Background:
- Acute myocardial infarction (AMI) requires accurate prognostication.
- Early assessment of ventricular function is crucial for predicting heart failure progression.
- Doppler echocardiography offers non-invasive insights into cardiac mechanics.
Purpose of the Study:
- To correlate early Doppler echocardiographic measurements with subsequent heart failure severity in AMI patients.
- To evaluate the predictive value of transmitral flow, systolic function, and spatial apical flow patterns.
Main Methods:
- Sixty consecutive AMI patients underwent early Doppler echocardiography.
- Measurements included transmitral flow (E/A ratio), systolic function (Vmax, TVI, OTR), and spatial apical flow patterns.
- Correlations were made with clinical heart failure status (Killip I/II).
Main Results:
- Transmitral flow (E/A ratio) showed low specificity (45%) and positive predictive value (70%) for mild heart failure.
- Systolic function measurements (Vmax, TVI, OTR) demonstrated high specificity (86-93%) and positive predictive value (91-96%).
- Normal spatial apical flow patterns achieved 84% specificity and 91% positive predictive value.
Conclusions:
- Systolic function parameters and spatial apical flow patterns are superior to E/A ratio in predicting mild heart failure post-AMI.
- These echocardiographic measures can identify patients with a milder clinical course on admission.
- Doppler echocardiography provides valuable prognostic information in acute myocardial infarction.
Abstract:
In 60 consecutive patients with acute myocardial infarction early Doppler echocardiographic measurements of ventricular systolic and diastolic function were obtained and correlated with the degree of heart failure during the subsequent clinical course. Transmitral flow (early to atrial peak flow velocity ratio [E/A], systolic function measurements (maximal velocity at aortic anulus level [Vmax]), and time velocity integral (TVI) were obtained, as well as an "outflow tract ratio" (OTR), that is, measurement of the functional length of the left ventricular outflow tract. Spatial apical flow pattern was assessed with the sample volume positioned near the lateral wall and interventricular septum and by the simultaneous recording of apical and transmitral flow with a high pulse repetition frequency. Mean values of both E/A and systolic measurements of the entire group were used as cutoff values to identify patients with absent or mild heart failure defined as Killip I and II. E/A greater than 0.96 had a low specificity (45%) and positive predictive value (70%). Systolic function: Vmax greater than 0.66 m/sec, TVI greater than 12.6 cm, and OTR less than 0.48 had a specificity of 86%, 93%, and 93%, respectively, and a positive predictive value of 91%, 96%, and 96%. Normal spatial apical flow patterns demonstrated a specificity of 84% and positive predictive value of 91% to identify patients with infarctions who have a subsequent mild clinical course. Thus in contrast to E/A, both systolic function measurements and spatial apical flow patterns may identify on admission patients with a subsequent mild clinical course.