TTN and Fabry disease: In the remaining seven patients, one mutation in the gene encoding α‐galactosidase A (Fabry's disease), two in beta‐myosin heavy chain (MYH7), one in alpha‐tropomyosin (TPM1), and 1variant with unknown clinical significance in the gene encoding titin were, respectively, found in five patients, and the test result was negative in two patients.