transthyretin cardiac amyloidosis; amyloid transthyretin cardiomyopathy (ATTR-CM)
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Epidemiology
- occurs primarily in men > 60 years of age
- may be > 10% in elderly men with preserved LVEF
- hereditary cardiac amyloidosis with Val122Ile mutation in transthyretin gene present in 3.5% of blacks[2]
Pathology
- occurs when misfolded transthyretin protein accumulates as amyloid fibrils in the heart, leading to heart failure & cardiac arrhythmias
- in hereditary cardiac amyloidosis with Val122Ile mutation in transthyretin gene, end-organ damage other than cardiac is uncommon[2]
Genetics
- can be inherited as an autosomal dominant trait
- hereditary cardiac amyloidosis due to Val122Ile mutation in the transthyretin gene
- deposition of wild-type transthyretin protein can occur
Laboratory
- also see cardiac amyloidosis
- biopsy
- aspiration of abdominal fat pad (first line)
- myocardial biopsy (last resort)
- amyloid amyloid typing
- Val122Ile mutation in transthyretin gene is most common variant in hereditary cardiac amyloidosis*
* MGUS may co-occur with transthyretin cardiac amyloidosis[2]
Diagnostic procedures
Radiology
Complications
Differential diagnosis
Management
- tafamidis meglumine (Vyndaqel)[1]
- subcutaneous inotersen (Tegsedi) 300 mg weekly
- subcutaneous eplontersen (Wainua) 45 mg every 4 weeks (FDA-approved)
- prior to tafamidis, treatment has been supportive
- liver transplantation for severe disease[2]
More general terms
References
- ↑ 1.0 1.1 Maurer MS, Schwartz JH, Gundapaneni B et al. Tafamidis treatment for patients with transthyretin amyloid cardiomyopathy. N Engl J Med 2018 Aug 27; PMID: https://www.ncbi.nlm.nih.gov/pubmed/30145929 Free full text https://www.nejm.org/doi/10.1056/NEJMoa1805689
Quarta CC, Solomon SD. Stabilizing transthyretin to treat ATTR cardiomyopathy. N Engl J Med 2018 Aug 27 PMID: https://www.ncbi.nlm.nih.gov/pubmed/30145933 Free Article https://www.nejm.org/doi/10.1056/NEJMe18100 - ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Medical Knowledge Self Assessment Program (MKSAP) 11, 17. 18, 19. American College of Physicians, Philadelphia 1998, 2015, 2018, 2022.
- ↑ Shah KB, Mankad AK, Castano A et al Transthyretin Cardiac Amyloidosis in Black Americans. Circ Heart Fail. 2016 Jun;9(6):e002558. Review. PMID: https://www.ncbi.nlm.nih.gov/pubmed/27188913 Free PMC Article
- ↑ Coelho T, Marques Jr W, Dasgupta NR et al Eplontersen for Hereditary Transthyretin Amyloidosis With Polyneuropathy. JAMA. Published online September 28, 2023. PMID: https://www.ncbi.nlm.nih.gov/pubmed/37768671 https://jamanetwork.com/journals/jama/fullarticle/2810248
George J FDA Approves New Agent for Nerve Pain From Rare Inherited Disease. Eplontersen gets a nod for polyneuropathy from hereditary transthyretin-mediated amyloidosis. MedPage Today December 22, 2023 https://www.medpagetoday.com/neurology/generalneurology/108020