Retrospective study of the electrocardiogram of elderly dogs and cats seen at a veterinary clinic in Rio de Janeiro. Research, Society and Development, [S. l.], v. 9, n. 9, p. e836997992, 2020. DOI: 10.33448/rsd-v9i9.7992. Disponível em: https://rsdjournal.org/rsd/article/view/7992. Acesso em: 5 dec. 2025.