Reciprocal ST segment changes in acute inferior myocardial infarction: clinical, haemodynamic and angiographic
Insights
Reciprocal ST segment depression in precordial leads during inferior myocardial infarction indicates worse patient outcomes. This finding suggests these ECG changes are significant indicators of increased complications and left ventricular dysfunction.
Area of Science:
- Cardiology
- Clinical Electrocardiography
Background:
- Reciprocal ST segment changes during acute inferior myocardial infarction are common but their clinical significance is debated.
- Electrocardiogram (ECG) findings can provide crucial prognostic information in myocardial infarction.
Purpose of the Study:
- To evaluate the clinical implications of reciprocal ST segment depression in precordial leads (V1-V4) in patients with acute inferior myocardial infarction.
- To correlate these ECG findings with patient demographics, cardiac enzyme levels, hospital complications, and left ventricular function.
Main Methods:
- Compared ECGs of 83 patients with acute inferior myocardial infarction, categorizing them into those with (Group 1, n=59) and without (Group 2, n=24) precordial ST depression.
- Analyzed clinical course, creatine kinase (CK) levels, hospital complications, and left ventricular function (ejection fraction, cardiac index) via echocardiography and angiography.
- Performed coronary arteriography approximately 3 weeks post-symptom onset.
Main Results:
- Patients with precordial ST depression (Group 1) were older, had significantly higher total CK and CK-MB levels, and experienced more hospital complications compared to Group 2.
- Group 1 also demonstrated greater left ventricular dysfunction, evidenced by lower ejection fraction and cardiac index.
- No significant differences in left ventricular wall motion on biplane angiography were observed between the groups.
Conclusions:
- Reciprocal ST segment depression in precordial leads during acute inferior myocardial infarction is associated with adverse clinical outcomes.
- These ECG findings serve as a valuable indicator of increased myocardial damage, higher complication rates, and impaired left ventricular function.
Abstract:
Reciprocal ST segment changes are frequent during acute inferior myocardial infarction, yet their significance remains controversial. In order to investigate the implications of these changes, the ECG obtained on admission for 83 patients with acute inferior myocardial infarction was compared with the clinical course and the results of angiographic and coronary arteriographic studies performed an average of 3 weeks after the onset of symptoms. Group 1 consisted of 59 patients with at least 1 mm of horizontal on downsloping ST segment depression in at least 1 of leads V1 to V4. Groups 2 consisted of 24 patients without precordial ST depression in this area. Group 1 patients were generally older than group 2 patients (59.6 +/- 6.4 versus 54 +/- 5.3 yr, P less than 0.01) had higher total creatine kinase (CK) levels and MB fractions (1835 +/- 940 versus 875 +/- 305, P less than 0.01, 269 +/- 102 versus 95 +/- 35 for MB fraction) and more complications during the hospital course (80% versus 38% P less than 0.01) and greater left ventricular dysfunction (ejection fraction 52.2 +/- 6% for group 1 versus 59.2 +/- 7% for group 2; cardiac index 2.75 +/- 0.41 min-1 m-2 for group 1 versus 3.25 +/- 0.31 min-1 m-2 for group 2 P less than 0.005). No difference was observed on biplane angiography as far as left ventricular wall kinesis was concerned.(ABSTRACT TRUNCATED AT 250 WORDS)
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