SAEVA Proceedings 2014 | Page 94

94   46TH  ANNUAL  CONGRESS  OF  THE  SAEVA        SKUKUZA      16-­‐20  FEBRUARY  2014     • • hypovolaemia must be corrected with an appropriate fluid management plan to restore intravascular volume. Arterial blood gas: PaO2 should remain above 150 mmHg when using 100% oxygen as the carrier gas during volatile inhalation agent anaesthesia. Venous blood gas: The central venous saturation of haemoglobin should be more than 70%. This indicates adequate blood content of oxygen to meet the metabolic demand of the patient. This parameter is gaining a tremendous amount of interest from human and veterinary clinicians working in the critical care industry (Tranquilli et al. 2007). Conclusion Effective monitoring of responses to fluid and pharmacological interventions to maintain tissue perfusion will allow for effective manipulations of the initial plan. Some horses require tweaking of the initial plan. Remember to make adjustments and allow time to gauge the patient’s response. Usually most pharmacological interventions will take 5 to 15 minutes before you can notice an onset of action. Remember to always assess anaesthetic depth; excessively deep anaesthesia is arguably the major cause of hypotension and hypoventilation. References 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.   Belli CB, Fernandes Távora JP, de Azevedo Ferreira R, Fernandes WR. (2013) Evaluation of Equine Albumin Solution in Fluid Therapy in Horses with Colic. Journal of Equine Veterinary Science 33, 509-514. Boesch JM. (2013) Anesthesia for the Horse with Colic. Veterinary Clinics of North America: Equine Practice 29, 193-214. Boscan P, Steffey EP. (2007) Plasma colloid osmotic pressure and total protein in horses during colic surgery. Veterinary Anaesthesia and Analgesia 34, 408-415. Cambier C, Wierinckx M, Grulke S et al. (2008) The effect of colic on oxygen extraction in horses. The Veterinary Journal 175, 102-107. Cook VL, Bain FT. (2003) Volume (crystalloid) replacement in the ICU patient. Clinical Techniques in Equine Practice 2, 122-129. Dugdale AH, Langford J, Mark Senior J, Proudman CJ. (2007) The effect of inotropic and/or vasopressor support on postoperative survival following equine colic surgery. Veterinary Anaesthesia and Analgesia 34, 82-88. Dukti S, White N. (2008) Surgical Complications of Colic Surgery. Veterinary Clinics of North America: Equine Practice 24, 515-534. Dukti S, White NA. (2009) Prognosticating Equine Colic. Veterinary Clinics of North America: Equine Practice 25, 217-231. Fantoni DT, Marchioni GG, Ida KK et al. (2013) Effect of ephedrine and phenylephrine on cardiopulmonary parameters in horses undergoing elective surgery. Veterinary Anaesthesia and Analgesia 40, 367-374. Gasthuys R, Messeman C, de Moor A. (1994) Cardiovascular effects of 7.2% hypertonic saline solution in halothane anaesthetized ponies. Veterinary Anaesthesia and Analgesia 21, 60-65. Schauvliege S, Gasthuys F. (2013) Drugs for Cardiovascular Support in Anesthetized Horses. Veterinary Clinics of North America: Equine Practice 29, 19-49. Senior JM. (2013) Morbidity, Mortality, and Risk of General Anesthesia in Horses. Veterinary Clinics of North America: Equine Practice 29, 1-18. Sinclair MD. (2003) A review of the physiological effects of alpha2-agonists related to the clinical use of medetomidine in small animal practice. Can Vet J 44, 885-897. Snyder LBC, Wendt-Hornickle E. (2013) General Anesthesia in Horses on Fluid and Electrolyte Therapy. Veterinary Clinics of North America: Equine Practice 29, 169-178. 94