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Atypical presentation of transthyretin amyloidosis in a non-endemic area.
Revista Clínica Española 2018 October 32
BACKGROUND AND OBJECTIVE: There are 2 types of amyloidosis caused by transthyretin deposits: the wild type (wt-ATTR) and the mutant type (m-ATTR), transmitted by autosomal dominant inheritance with variable penetrance, manifesting with neurological and/or cardiac symptoms. We report on 3 families affected by m-ATTR diagnosed in a nonendemic area.
MATERIAL AND METHODS: We studied 63 patients with a high suspicion of ATTR. The diagnosis was subsequently performed by magnification through polymerase chain reaction of DNA. For the positive cases, we studied the first-degree relatives.
RESULTS: We detected 7 positive cases of m-ATTR, distributed among 3 families (Glu74Gln, Val142Ile in heterozygosity and Val142Ile in homozygosity), and 3 cases of nonpathogenic variants.
CONCLUSIONS: Hereditary ATTR is a rare disease but is present in nonendemic areas and should therefore be considered in the differential diagnosis of patients with polyneuropathy and/or heart failure with preserved ejection fraction.
MATERIAL AND METHODS: We studied 63 patients with a high suspicion of ATTR. The diagnosis was subsequently performed by magnification through polymerase chain reaction of DNA. For the positive cases, we studied the first-degree relatives.
RESULTS: We detected 7 positive cases of m-ATTR, distributed among 3 families (Glu74Gln, Val142Ile in heterozygosity and Val142Ile in homozygosity), and 3 cases of nonpathogenic variants.
CONCLUSIONS: Hereditary ATTR is a rare disease but is present in nonendemic areas and should therefore be considered in the differential diagnosis of patients with polyneuropathy and/or heart failure with preserved ejection fraction.
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