[RAPID METHOD OF THE AMYLOID STAINING WITH CONGO RED FOR LIGHT AND FLUORESCENCE MICROSCOPY]

Area of Science:

• Histopathology
• Biochemistry
• Cardiology

Background:

• Cardiac amyloidosis is a progressive disease.
• Accurate histochemical staining is crucial for diagnosis.
• Congo red is a common stain for amyloid detection.

Purpose of the Study:

• To optimize the Congo red histochemical staining method for myocardial amyloid.
• To improve the quality and efficiency of amyloid staining in cardiac specimens.

Main Methods:

• Optimized Congo red staining protocol using autopsy-derived myocardial specimens from patients with diagnosed cardiac amyloidosis.
• Investigated the effect of pre-heating slides in liquid, particularly at acidic pH, on staining quality.
• Evaluated staining contrast, fluorescence intensity, and non-specific background staining.

Main Results:

• Pre-heating slides in an acidic solution significantly improved amyloid staining quality.
• Developed a protocol yielding high-contrast and high-intensity fluorescent staining of myocardial amyloid.
• Achieved a reduced total staining duration, increased staining stability, and eliminated non-specific background staining.

Conclusions:

• The optimized protocol enhances the histochemical diagnosis of cardiac amyloidosis.
• This method provides reliable, high-quality visualization of myocardial amyloid.
• The improved protocol offers a more efficient and stable diagnostic tool for cardiac amyloidosis.