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Behavior of serum myoglobin during cardiac catheterization: concise communication
Insights
Serum myoglobin (MG) levels do not significantly increase after coronary angiography, even with cardiac events. This finding suggests myoglobin is a reliable indicator for ruling out myocardial infarction post-procedure.
Area of Science:
- Cardiology
- Biomarkers
- Diagnostic Medicine
Background:
- Coronary angiography is a common procedure with potential risks of myocardial injury.
- Identifying reliable biomarkers for myocardial injury during cardiac catheterization is crucial for patient management.
Purpose of the Study:
- To evaluate the utility of serum myoglobin (MG) as an indicator of myocardial injury during routine cardiac catheterization and coronary angiography.
- To determine if procedural events like angina or hypotension elevate MG levels.
Main Methods:
- Serum myoglobin levels were measured in 28 patients immediately before, after, and 4 hours following coronary angiography using the Judkins technique.
- A positive control group received intramuscular pentobarbital to validate the assay's sensitivity to tissue injury.
Main Results:
- No significant rise in serum myoglobin was observed in the study population, despite occurrences of angina, hypotension, or severe coronary disease.
- The positive control group demonstrated a consistent and significant increase in myoglobin levels (1.5-3 times normal, p < 0.001).
Conclusions:
- Myocardial or peripheral tissue injury during coronary angiography does not elevate venous myoglobin levels in the absence of myocardial infarction or prior intramuscular injections.
- Serum myoglobin serves as a valuable diagnostic tool for excluding myocardial infarction following cardiac catheterization procedures.
Abstract:
We have studied 28 patients undergoing coronary angiography by the Judkins technique to determine whether serum myoglobin (MG) might be useful as an indicator of myocardial injury during routine cardiac catheterization and coronary angiography. MG was measured immediately before and after the procedure, and 4 hr later. The study population failed to show a rise of MG outside the normal range in spite of angina, hypotension, or severe coronary disease. Four patients premedicated with intramuscular pentobarbital (positive control) showed a consistent rise, with a range 1.5--3 times normal (p less than 0.001). We conclude that injury to myocardial or peripheral tissues occurring during coronary angiography does not raise myoglobin in venous blood above normal levels in the absence of myocardial infarction or preoperative intramuscular injection. Myoglobin, therefore, provides a useful test for the exclusion of myocardial infarction following coronary angiography.