Effect of ephedrine and phenylephrine on cardiopulmonary parameters in horses undergoing elective surgery - Fantoni, Denise Tabacchi; Marchioni, Gabriela Gomes de; Ida, Keila Kazue; Belo, Juliana N. B.; Zoppa, André Luis do Valle de; Silva, Luis Claudio Lopes Correia da; Ambrósio, Aline Magalhães (Veterinary Anaesthesia and Analgesia, 2013)