A clinical, echocardiographic and genetic characterization of a Danish kindred with familial amyloid transthyretin methionine 111 linked cardiomyopathy.
OBJECTIVE
To identify carriers and non-carriers of the mutant transthyretin methionine 111 linked familial amyloid disease, to detect early signs of the restrictive cardiomyopathy and other clinical manifestations characteristic of this inheritable disease.


RESULTS
Out of 125 living family members 99 were available for clinical, echocardiographic and genetic examination. Twenty-five family members were heterozygous carriers of the mutant transthyretin methionine 111 genotype, while 74 were non-carriers. Among the 25 carriers, none had overt clinical signs of heart disease. Eight carriers, all above the age of 35, showed echocardiographic abnormalities suggestive of developing or manifest restrictive cardiomyopathy. Three had biopsy-verified transthyretin-related amyloid cardiomyopathy. None of the 15 carriers in the younger age group exhibited aberrant echocardiographic patterns. Nine carriers had carpal tunnel syndrome as opposed to none of the non-carriers.


CONCLUSIONS
For early detection of familial amyloid cardiomyopathy, echocardiography is the investigation of choice. The first sign is diastolic dysfunction detected as an abnormal relaxation pattern. The appearance of echocardiographic aberrations solely in the older age group suggests that the cardiomyopathy is a late onset disease. Carpal tunnel syndrome appears to be the earliest presenting clinical symptom. A curative treatment seems to be an early liver transplantation.
Department of Cardiology, Bispebjerg Hospital, University of Copenhagen, Denmark.
I H
IH
Svendsen
F
F
Steensgaard-Hansen
B Y
BY
Nordvåg
D000293:Adolescent; D000328:Adult; D000368:Aged; D000686:Amyloidosis / Q000000981:diagnostic imaging / Q000235:genetics*; D009202:Cardiomyopathies / Q000000981:diagnostic imaging / Q000235:genetics*; D002313:Cardiomyopathy, Restrictive / Q000000981:diagnostic imaging / Q000235:genetics; D002349:Carpal Tunnel Syndrome / Q000000981:diagnostic imaging / Q000235:genetics; D002648:Child; D004252:DNA Mutational Analysis; D005260:Female; D006580:Genetic Carrier Screening; D008040:Genetic Linkage / Q000235:genetics*; D005838:Genotype; D006801:Humans; D008297:Male; D008715:Methionine / Q000235:genetics*; D008875:Middle Aged; D010375:Pedigree; D011228:Prealbumin / Q000235:genetics*; D014463:Ultrasonography; D016277:Ventricular Function, Left / Q000235:genetics / Q000502:physiology
D011228:Prealbumin; D008715:Methionine