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Nitroblue tetrazolium test: early gross detection of human myocardial infarcts
Abstract:
The hearts from 81 cases of suspected myocardial infarction were stained with the nitroblue tetrazolium (NBT) test to show damaged heart muscle in the gross at necropsy. Thirty-seven cases were of stated clinical age less than 12 h and 27 of these were less than 5 h. Seven out of 17 cases under 1 h were negative with NBT, but all other cases showed either focal diminution of staining with the dark blue diformazan or patchy red staining with the monogormazan of NBT. Thus the method may be of diagnostic value at necropsy from 1 h onwards after the time of apparent infarction (stated clinical onset). Satisfactory results were obtained up to 3 days at ambient temperature after death and for longer when the corpse was stored at 4 degrees C.
Insights
The nitroblue tetrazolium (NBT) test can identify myocardial infarction damage in necropsy. This diagnostic method shows reliable results from 1 hour post-infarction, aiding in forensic pathology.
Area of Science:
- Pathology
- Forensic Medicine
- Cardiovascular Science
Background:
- Myocardial infarction diagnosis at necropsy can be challenging.
- Histological methods are time-consuming and may not reflect gross changes.
- A rapid, gross diagnostic test for fresh myocardial infarction is needed.
Purpose of the Study:
- To evaluate the diagnostic utility of the nitroblue tetrazolium (NBT) test for gross detection of myocardial infarction at necropsy.
- To determine the earliest time point at which NBT staining reliably indicates infarction.
- To assess the stability of NBT staining for myocardial infarction over time postmortem.
Main Methods:
- Hearts from 81 cases of suspected myocardial infarction were analyzed.
- The nitroblue tetrazolium (NBT) staining technique was applied to gross specimens.
- Staining patterns (diformazan, monogormazan) were correlated with clinical onset time.
Main Results:
- NBT staining showed damaged heart muscle in suspected myocardial infarction cases.
- Reliable staining was observed from 1 hour after clinical onset of infarction.
- Seven out of 17 cases under 1 hour were negative; others showed characteristic staining.
- Satisfactory results were obtained up to 3 days at ambient temperature and longer with cold storage.
Conclusions:
- The NBT test is a valuable gross diagnostic tool for myocardial infarction at necropsy.
- The test provides reliable results from approximately 1 hour post-infarction.
- NBT staining is stable for several days, especially under refrigerated conditions, enhancing its forensic utility.