Related Experiment Videos
Angiographic evidence that reciprocal ST-segment depression during acute myocardial infarction does not indicate
Insights
Reciprocal ST-segment depression during acute myocardial infarction (MI) does not indicate remote ischemia or predict coronary artery disease (CAD). This common ECG finding appears to be a benign electrical phenomenon, not a sign of further cardiac complications.
Area of Science:
- Cardiology
- Electrocardiography
- Ischemic Heart Disease
Background:
- Reciprocal ST-segment depression during acute myocardial infarction (MI) is frequently observed.
- The clinical significance of this electrocardiographic pattern remains unclear, with prior studies lacking contemporary angiographic data.
Purpose of the Study:
- To prospectively investigate the significance of reciprocal ST-segment depression in acute MI.
- To correlate ECG findings with left ventricular wall motion and coronary artery anatomy.
Main Methods:
- Prospective evaluation of 23 patients with acute MI.
- Assessment of left ventricular wall motion, coronary anatomy, and ECG during the acute phase.
- Segmental wall motion analysis as an indicator of ischemia.
Main Results:
- 47% of anterior MI and 50% of inferior MI patients showed reciprocal ST-segment depression.
- No significant difference in infarct wall motion abnormalities between groups.
- No remote wall motion abnormalities were observed, irrespective of ST depression.
- Reciprocal ST depression did not predict the extent or severity of coronary artery disease (CAD).
Conclusions:
- Reciprocal ST-segment depression in acute MI is not associated with remote myocardial ischemia.
- This ECG pattern does not appear to predict multivessel CAD or indicate more extensive MI.
- The findings suggest reciprocal ST depression may represent a benign electrical phenomenon.
Abstract:
Although reciprocal ST-segment depression from the remote noninfarcting ventricular wall during acute myocardial infarction (MI) is a common clinical finding, the significance of this electrocardiographic pattern is unclear. Previous retrospective studies have suggested that these findings may reflect either remote wall ischemia, multivessel coronary artery disease (CAD), extensive MI or a benign electrical phenomenon. Prior studies have lacked angiographic data obtained at the time of these acute electrocardiographic changes. In this study we prospectively evaluated 23 patients with acute MI. Left ventricular wall motion, coronary anatomy and the ECG were all assessed over a short period during the acute phase of the MI. Segmental wall motion was used as a sensitive indicator of ischemia. Seventeen patients had acute anterior MI, of whom 47% had reciprocal ST-segment depression; 6 patients had inferior MI, with 3 showing reciprocal ST depression. The mean degree of ST-segment elevation from the infarcting wall tended to be greater in patients with reciprocal ST-segment depression than in those without such reciprocal ST depression (2.8 +/- 0.4 vs 1.9 +/- 0.3 mm, p = 0.06). Patients with and without reciprocal ST-segment depression had similar degrees of segmental dysfunction in the infarct wall. However, no abnormalities in segmental wall motion in the remote wall were seen regardless of the presence or absence of remote wall ST-segment depression. In addition, the presence or absence of ST-segment depression did not predict the extent or degree of CAD.(ABSTRACT TRUNCATED AT 250 WORDS)