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Quantitating intestinal ischemia with nitroblue tetrazolium salts
R J Powell1, J L Cronenwett, A J Gauthier
1Section of Vascular Surgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hamsphire 03756, USA.
The Journal of Surgical Research
|April 1, 1995
Summary
The nitroblue tetrazolium (NBT) reduction assay accurately quantifies intestinal ischemic injury by measuring mitochondrial function. This spectrophotometric method shows high sensitivity and specificity for detecting ischemia, correlating well with duration and histologic grading.
Area of Science:
- Biochemistry
- Physiology
- Pathology
Background:
- Intestinal ischemia is a critical condition requiring accurate assessment.
- Histologic grading is a standard method for evaluating tissue injury.
- A reliable assay for quantifying ischemic damage is needed.
Purpose of the Study:
- To evaluate the spectrophotometric nitroblue tetrazolium (NBT) reduction assay for quantifying experimental intestinal ischemic injury.
- To compare the NBT assay with standard histologic grading.
Main Methods:
- A rat model of progressive intestinal ischemia was used.
- Segments of small intestine were subjected to ischemia for varying durations (15-120 min).
- NBT reduction assay and light microscopy histologic grading were performed on tissue samples.
Main Results:
- NBT reduction significantly decreased after 30 min of ischemia (P < 0.05) and decreased further with longer ischemic times.
- NBT reduction correlated closely with ischemia duration (r=0.81) and histologic grade (r=0.77).
- The assay demonstrated 100% sensitivity and 94% specificity for detecting ischemia >= 30 min.
Conclusions:
- The spectrophotometric NBT assay is an accurate method for quantifying small intestinal ischemic injury.
- The NBT assay provides valuable information on mitochondrial functional status.
- This assay offers a reliable tool for research and clinical assessment of intestinal ischemia.