Fig. 1

Children and their parents gene sequencing results: A heterozygous mutation in the exon coding region of the SCN5A gene, C. 5851G > T (coding region 5551 nucleotide changed from G to T), was detected in the peripheral blood of the patient. The mutation resulted in the change of amino acid 1951 from leucine (Val) to isoleucine (Leu), which may affect the function of the protein. The child’s father carries the mutation