Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Nav1.5NM_0003359606HB1    HB2    HH1    IVF    LQT3    SCN5A   
Nav1.5NM_1980569606HB1    HB2    HH1    IVF    LQT3    SCN5A   
Nav1.5AB1584699606
Nav1.5AB1584709606

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002