title: Isolated Atrial Amyloidosis in Patients with Various Types of Atrial Fibrillation.
abstract: The myocardium of the right and left atrial appendages (auricles) in patients with paroxysmal, persistent, and permanent forms of atrial fibrillation was examined by histological methods and electron microscopy. Isolated atrial amyloidosis was detected in the left (50.0-56.3% patients) and in the right (45.0-55.6% patients) atrial appendages. In all cases, immunohistochemistry revealed atrial natriuretic peptide in fibrillary amyloid deposits. Ultrastructurally, amyloid masses formed clusters of myofibrils 8-10 nm in diameter. They were chaotically located in the extracellular space along the sarcolemma as well as in membrane invaginations, dilated tubules of cardiomyocyte T-tubular system, and vascular walls. Amyloidosis was predominantly observed in women; its degree positively correlated with age of patients and duration of atrial fibrillation but negatively correlated with atrial fibrosis. The study revealed positive (in permanent atrial fibrillation) and negative (in paroxysmal atrial fibrillation) correlation of amyloidosis with myofibril content in atrial cardiomyocytes.
authors.affiliation: A. N. Bakulev Federal Research Center for Cardiovascular Surgery, Moscow, Russia. tatiana@box.ru.
authors.forename: T V
authors.initials: TV
authors.lastname: Sukhacheva
authors.affiliation: A. N. Bakulev Federal Research Center for Cardiovascular Surgery, Moscow, Russia.
authors.forename: M V
authors.initials: MV
authors.lastname: Eremeeva
authors.affiliation: A. N. Bakulev Federal Research Center for Cardiovascular Surgery, Moscow, Russia.
authors.forename: A G
authors.initials: AG
authors.lastname: Ibragimova
authors.affiliation: A. N. Bakulev Federal Research Center for Cardiovascular Surgery, Moscow, Russia.
authors.forename: V A
authors.initials: VA
authors.lastname: Vaskovskii
authors.affiliation: A. N. Bakulev Federal Research Center for Cardiovascular Surgery, Moscow, Russia.
authors.forename: R A
authors.initials: RA
authors.lastname: Serov
authors.affiliation: A. N. Bakulev Federal Research Center for Cardiovascular Surgery, Moscow, Russia.
authors.forename: A Sh
authors.initials: ASh
authors.lastname: Revishvili
mesh_terms: D000328:Adult; D000368:Aged; D000682:Amyloid / Q000378:metabolism; D000686:Amyloidosis / Q000378:metabolism / Q000473:pathology*; D001281:Atrial Fibrillation / Q000378:metabolism / Q000473:pathology*; D009320:Atrial Natriuretic Factor / Q000378:metabolism; D005260:Female; D006325:Heart Atria / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000378:metabolism / Q000473:pathology; D055815:Young Adult
chemical_list: D000682:Amyloid; D009320:Atrial Natriuretic Factor
keywords: atrial fibrillation; atrial natriuretic peptide; cardiomyocytes; isolated atrial amyloidosis; ultrastructure