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Published on: July 17, 2012
The detection of abscesses with diffusible tracers
Abstract:
In six patients with suspected infection, scintigraphy with diffusible tracers outlined the margins and central portion of an abscess. An animal model was developed to study this process quantitatively. Small inflammatory lesions yielding volumes of pus of 0.1-0.2 mL were shown to have increased blood volume of 0.7 +/- 0.5 mL, increased blood flow by a factor of three and increased extracellular fluid volume of 10 +/- 6 mL. This supports the patient data and indicates that the pathophysiologic features characterising the clinical studies are hyperemia and oedema associated with an abscess. The slow, central area of tracer diffusion corresponded to the presence of pus. Scintigraphy with 99mTc-DTPA is a convenient way of detecting suspected inflammatory lesions and localising collections of pus.
Insights
Scintigraphy using 99mTc-DTPA effectively detects suspected inflammatory lesions and locates pus collections. This imaging technique reveals abscess characteristics like hyperemia and edema, aiding in diagnosis.
Area of Science:
- Nuclear Medicine
- Medical Imaging
- Pathophysiology
Background:
- Abscesses present diagnostic challenges in suspected infections.
- Understanding the pathophysiologic features of abscesses is crucial for diagnosis.
Purpose of the Study:
- To evaluate the utility of scintigraphy with diffusible tracers for detecting and localizing abscesses.
- To quantitatively study the pathophysiologic changes associated with inflammatory lesions.
Main Methods:
- Scintigraphy with 99mTc-DTPA was performed in six patients with suspected infections.
- An animal model was developed to quantitatively assess inflammatory lesions and pus volumes.
Main Results:
- Scintigraphy successfully outlined abscess margins and central portions in patients.
- Animal models showed increased blood volume, blood flow, and extracellular fluid in inflammatory lesions.
- Slow central tracer diffusion correlated with the presence of pus.
Conclusions:
- Scintigraphy with 99mTc-DTPA is a valuable tool for detecting inflammatory lesions and localizing pus.
- Hyperemia and edema are key pathophysiologic features of abscesses detectable by this method.
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