1. Electrocardiographic evaluation of the degree of sedation and the isolated use of methadone in healthy dogs 
Thais M Menegheti, Juliana T Wagatsuma, Acácio D Pacheco, Beatriz Perez, Cynara M Pacheco, Caio JX Abimussi, Paulo PS dos Santos, Valéria NL de Souza Oliva 
Veterinary Anaesthesia and Analgesia 
Volume 41, Issue 1, Pages (January 2014)
DOI: /vaa.12086
Copyright © 2014 Association of Veterinary Anaesthetists and American College of Veterinary Anesthesia and Analgesia Terms and Conditions

2. Figure 1
Electrocardiographic recording (Lead II, 25 mm second−1) from one dog with 0.3 mg kg−1 methadone, 30 minutes after administration. This dog had three ventricular escape complexes in the whole observation period (5 minutes).
Veterinary Anaesthesia and Analgesia  , DOI: ( /vaa.12086)
Copyright © 2014 Association of Veterinary Anaesthetists and American College of Veterinary Anesthesia and Analgesia Terms and Conditions

3. Figure 2
Electrocardiographic recording (Lead II, 25 mm second−1) from one dog with 1.0 mg kg−1 methadone, 5 minutes after administration. There is an idioventricular rhythm with 50 ventricular escape complexes minute−1 that is equivalent to 80% of the whole observation period.
Veterinary Anaesthesia and Analgesia  , DOI: ( /vaa.12086)
Copyright © 2014 Association of Veterinary Anaesthetists and American College of Veterinary Anesthesia and Analgesia Terms and Conditions