What is atrial natriuretic factor amyloidosis?

Updated: May 09, 2019
  • Author: Robert O Holmes, Jr, DO; Chief Editor: Herbert S Diamond, MD  more...
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The precursor protein is atrial natriuretic factor (ANF), a hormone controlling salt and water homeostasis that is synthesized by the cardiac atria. Amyloid deposits are localized to the cardiac atria. This condition is highly prevalent in elderly people and generally is of little clinical significance. ANF amyloidosis (AANF) is most common in patients with long-standing congestive heart failure, presumably because of persistent ANF production. Proper diagnosis requires extensive testing, including paraffin blocks of tissue for molecular typing by liquid chromatography-tandem mass spectrometry and observation of Congo red staining on affected atrial tissues. [74] No known relation exists to the amyloidoses that involve the cardiac ventricles (ie, AL, ATTR).

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