Fetal heart assessment in the first trimester of pregnancy: influence of crown-rump length and maternal body mass index

David Baptista Silva Pares¹; Angélia Iara Felipe Lima²; Edward Araújo Júnior¹; Luciano Marcondes Machado Nardozza¹; Wellinton P. Martins³; Antônio Fernandes Moron¹

DOI: 10.5935/1678-9741.20130078 Braz J Cardiovasc Surg. 2013;28(4):477-481