Cardiac amyloidosis: from clinical suspicion to morphological diagnosis

Area of Science:

• Cardiology
• Pathology
• Medical Diagnostics

Background:

• Amyloidosis is a diverse disease group defined by amyloid protein deposition in tissues, causing organ damage.
• Cardiac involvement significantly impacts prognosis in systemic amyloidosis, necessitating accurate diagnosis and typing.
• Clinical manifestations include heart failure, arrhythmias, and distinctive ECG/echocardiogram findings.

Purpose of the Study:

• To outline the diagnostic approach for systemic amyloidosis, emphasizing cardiac involvement.
• To detail the laboratory and histopathological methods used in diagnosing amyloidosis.
• To highlight the prognostic significance of cardiac amyloidosis.

Main Methods:

• Standard laboratory tests: monoclonal protein studies (blood/urine), cardiac biomarkers.
• Histological examination of biopsy specimens: special stains, immunohistochemistry, immunofluorescence.
• Advanced techniques: proteomic analysis (specialized centers).

Main Results:

• Cardiac amyloidosis is associated with specific proteins: immunoglobulin light chains, serum amyloid A, transthyretin, atrial natriuretic factor, or apolipoprotein A1.
• Congestive heart failure, particularly right-sided, and arrhythmias are key clinical signs.
• Characteristic electrocardiography and echocardiography findings aid diagnosis.

Conclusions:

• Accurate diagnosis and typing of amyloidosis, especially cardiac involvement, are critical for patient prognosis.
• A multi-faceted diagnostic strategy combining clinical, laboratory, and histological methods is essential.
• Early identification of cardiac amyloidosis guides appropriate management and improves outcomes.