Anesthetic Management of Cattle (Last Updated: 15-Feb-2001 )
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1 In: Recent Advances in Anesthetic Management of Large Domestic Animals, E. P. Steffey (Ed.) Publisher: International Veterinary Information Service ( Ithaca, New York, USA. Anesthetic Management of Cattle (Last Updated: 15-Feb-2001 ) T. Riebold Veterinary Teaching Hospital, College of Veterinary Medicine, Oregon State University, Corvallis, Oregon, USA. Introduction As in other species, sedation and anesthesia are required in cattle for surgical or diagnostic procedures. The decision to induce general anesthesia may be influenced by cattle's anatomic and physiologic characteristics. Cattle usually accept physical restraint well and that, in conjunction with local or regional anesthesia, is often sufficient to allow completion of many procedures. Other diagnostic and surgical procedures that are more complex require general anesthesia. The intent of this chapter is to review current knowledge and techniques of general anesthetic management of cattle as applied in clinical practice in the United States. Preanesthetic Preparation Considerations for preanesthetic preparation include fasting, assessment of hematologic and blood chemistry values, venous catheterization, and estimation of body weight. Cattle as ruminants are susceptible to complications associated with recumbency and general anesthesia; tympany, regurgitation, and aspiration pneumonia. Accordingly, it is recommended that calves be fasted hours and deprived of water for 8-12 hours. Adult cattle should be fasted hours and deprived of water for hours. In nonelective cases, this is often not possible and precautions should be taken to avoid aspiration of gastric fluid and ingesta. Fasting neonates is not advisable because hypoglycemia may result. Fasting and water deprivation will decrease the incidence of tympany and regurgitation by decreasing the volume of fermentable ingesta but may also produce bradycardia in cattle [1]. Additionally, pulmonary functional residual capacity maybe better preserved in the fasted anesthetized ruminant [2]. Even with these precautions, some cattle will become tympanitic while others will regurgitate. Hematologic and blood chemistry values should be determined and evaluated as appropriate before induction of anesthesia. Venipuncture and catheterization of the jugular vein are often performed prior to anesthesia. Catheters up to 16 gauge are appropriate for calves while adult cattle require gauge catheters. Infiltration of a local anesthetic at the site of catheterization is recommended. Anticholinergics are usually not administered to cattle prior to induction of anesthesia as they do not consistently decrease salivary secretions unless used in high doses and repeated frequently. Usual doses of atropine to prevent bradycardia in cattle ( mg/kg IV) do not prevent salivation during anesthesia. Glycopyrrolate ( mg/kg IM or mg/kg IV) may be substituted for atropine [3]. Sedation/Restraint The alpha-2 agonist drugs are currently most commonly used to induce tranquilization and/or sedation in cattle. Other drugs such as acepromazine, chloral hydrate, and pentobarbital have long histories of use with cattle and continue to be commercially available, however, their contemporary importance has become mostly limited to special circumstances. Diazepam can also be used in calves and other small ruminants. Readers are referred to available texts for further discussion on these older drugs [4-8]. Xylazine, detomidine, medetomidine, and romifidine are alpha-2 agonists. Of these, xylazine is presently most often used in the U.S. to provide sedation or, in higher doses, restraint (recumbency and light planes of general anesthesia) in cattle [5, 9,10]. There appears to be some variation in response to xylazine within a species. Hereford cattle have been shown to be more sensitive to xylazine than Holstein cattle [11] and anecdotal evidence indicates that Brahmans are the most sensitive of the breeds [7]. High environmental ambient temperature will cause a pronounced and prolonged response to xylazine in cattle [12]. Xylazine also will cause hyperglycemia and hypoinsulinemia in cattle and sheep [13-16]. Additionally, it will cause hypoxemia and hypercarbia in cattle [11,17] and can cause pulmonary edema [18]. Finally, xylazine has an oxytocin-like effect on the uterus of pregnant cattle [19] and sheep [20]. Detomidine is used to a lesser extent in the U.S. but is also effective for providing sedation and/or analgesia in cattle [8, 21]. It does not appear to have the same effect on the gravid uterus as xylazine in cattle [21] and is the drug of choice when sedation is needed in pregnant cattle. The degree of sedation or restraint produced by xylazine depends on the route of injection, dosage given, and the animal's temperament. Low doses ( mg/kg IV or IM) will provide sedation without recumbency in cattle. Detomidine is given at µg/kg IV in cattle to provide standing sedation of approximately minutes
2 duration [5, 8]. Higher doses of xylazine (0.1 mg/kg IV or 0.2 mg/kg IM) will provide recumbency and light planes of general anesthesia in cattle for approximately one hour [5,7]. Higher doses can be expected to induce longer periods of recumbency. Detomidine at 40 µg/kg IV will produce profound sedation and recumbency [5]. Higher doses of detomidine (100 µg/kg) administered by dart have been used to immobilize free ranging cattle [22]. Approximately 15 minutes were required for onset of action [22]. Medetomidine has been given at 30.0 µg/kg IM to produce recumbency in calves lasting minutes [23]. If one was to extrapolate from use of alpha-2 agonists in sheep, romifidine at 50 µg/kg IV or medetomidine at 10 µg/kg IV could be expected to produce recumbency in cattle [24]. Combinations of xylazine and butorphanol have been used in cattle to provide neuroleptanalgesia. Doses are mg/kg IV of each drug given separately in cattle [25]. Duration of action is approximately 1 hour. Combinations of detomidine (0.07 mg/kg) and butorphanol (0.04 mg/kg) have also been used to immobilize free ranging cattle [22]. Sedation following use of alpha-2 agonists can be reversed by alpha-2 adrenoceptor antagonists, yohimbine, tolazoline, atipamezole, and idazoxan. Yohimbine is given at 0.12 mg/kg IV although there is some variability in response to its administration in cattle [26,27] Tolazoline is given at mg/kg IV [27]. There are anecdotal reports of death associated with tolazoline administration in cattle, usually following higher doses of the drug given to animals with compromised physical status. Tolazoline should be given at mg/kg IV. If sufficient arousal does not occur, additional tolazoline could be given. Tolazoline given at 2.0 mg/kg IV will cause hyperesthesia in unsedated cattle. [28] Idazoxan is given at 0.05 mg/kg IV to calves [29]. Atipamezole is given at µg/kg IV [30]. Doxapram, an analeptic, can be used to augment the response of yohimbine or tolazoline to alpha-2 agonist sedated cattle. Doxapram (1.0 mg/kg IV) given alone has been shown to be effective in cattle [31]. Induction General anesthesia can be induced by either injectable or, especially in young calves, inhalation techniques. Available drugs include: thiobarbiturates, ketamine, guaifenesin, tiletamine-zolazepam, propofol, halothane, isoflurane, and sevoflurane [5]. Thiopental - The thiobarbiturates, thiopental and thiamylal, have been used extensively in veterinary anesthesia, either alone and in combination with guaifenesin to quickly induce general anesthesia. Thiamylal is similar to thiopental but more potent and is no longer commercially available in North America. Its use will not be further discussed. Recovery from induction doses of thiopental is based upon redistribution of the drug from the brain to other tissues in the body. Metabolism of the agent continues for some time following recovery until final elimination occurs. Maintenance of anesthesia with thiopental is not recommended because saturation of tissues with thiopental causes recovery to be dependent on metabolism and recovery will be prolonged. Concurrent use of nonsteroidal antiinflammatory drugs is contraindicated because they may displace the thiobarbiturates from plasma protein and delay recovery [32]. Thiopental is given at 6-10 mg/kg IV in unsedated animals and will provide approximately minutes of anesthesia. Ketamine - Ketamine is commonly used in veterinary anesthesia. It also provides mild cardiovascular stimulation and is safer than thiopental in sick animals. Following anesthetic induction doses, ketamine often does not eliminate the swallowing reflex however, tracheal intubation can be accomplished. While ketamine will induce immobilization and incomplete analgesia when given alone, addition of a sedative or tranquilizer will improve muscle relaxation and quality of anesthesia. Most commonly xylazine or diazepam is recommended, although the availability of detomidine offers another alternative. Xylazine ( mg/kg IM) can be given followed by ketamine (10-15 mg/kg IM) in calves [33]. Anesthesia usually lasts about 45 minutes and can be prolonged by injection of additional ketamine at 3-5 mg/kg IM or 1-2 mg/kg IV. The longer duration of action of xylazine obviates the need for readministration of xylazine in most cases. Alternatively, xylazine ( mg/kg IV) followed by ketamine (3-5 mg/kg IV) can be used to provide anesthesia of minutes duration [5,9,10]. Adult cattle can be anesthetized with xylazine ( mg/kg IV) followed by ketamine (2.0 mg/kg IV) [34]. The lower dose of xylazine is used when cattle weigh greater than 600 kg [34]. Duration of anesthesia is approximately 30 minutes; anesthesia can be prolonged for 15 minutes with additional ketamine ( mg/kg IV). Diazepam (0.1 mg/kg IV) followed immediately by ketamine (4.5 mg/kg IV) can be used in cattle. Muscle relaxation is usually adequate for tracheal intubation although the swallowing reflex may not be completely obtunded. Anesthesia usually is of minutes duration following diazepam-ketamine with recumbency of up to 30 minutes [4-6,10]. Medetomidine has been combined with ketamine to provide anesthesia in calves. Because medetomidine (20 µg/kg IV) is much more potent than xylazine, very low doses of ketamine (0.5 mg/kg IV) can be used [30]. However, use of a local anesthetic at the surgical site may be required when ketamine is used at this dose [30]. Consequently, complete reversal of anesthesia can be achieved with alpha-2 antagonists without excitement occurring during recovery. Guaifenesin - Guaifenesin, a centrally acting skeletal muscle relaxant, can be used alone to induce recumbency in cattle. Addition of ketamine or thiopental to guaifenesin improves induction quality and decreases the volume required for induction and improves muscle relaxation when compared to induction with ketamine or the thiobarbiturates given alone. Typically, 5% guaifenesin solutions are used as hemolysis can occur with 10% guaifenesin solutions [35,36]. Commonly these solutions are given rapidly to effect in either tranquilized or untranquilized patients. The calculated dose is 2.0 ml/kg. The amount of ketamine added to guaifenesin varies but is commonly mg/ml. The amount of
3 thiobarbiturate added to guaifenesin varies but is commonly mg/ml. For convenience, guaifenesin-based mixtures may be injected with large syringes rather than administered by infusion to calves. Following induction, guaifenesin-based solutions can be infused to effect to maintain anesthesia. Xylazine may also be added to ketamine-guaifenesin solutions for induction and maintenance of anesthesia in cattle [34,37]. Final concentrations are guaifenesin (50 mg/ml), ketamine (1-2 mg/ml), and xylazine (0.1 mg/ml). This solution is infused at ml/kg IV for induction. Anesthesia can be maintained by infusion of the mixture at 1.5 ml/kg/hr for calves [37] and at 2 ml/kg/hr for adult cattle [34,37] although final administration rate will vary depending upon circumstances. If the procedure requires greater than 2 ml/kg of the guaifenesin-ketamine-xylazine mixture to allow completion of the surgical procedure, the amount of xylazine added should be decreased by 50% because its duration of action is longer than the other two agents. [25] Alternatively, a mixture of guaifenesin (50 mg/ml), ketamine (1 mg/ml), and xylazine (0.05 mg/ml) could be infused at 2.0 ml/kg following induction for maintenance. If anesthetic depth becomes insufficient, the infusion rate should be increased by 10-20%. Use of an infusion pump allows administration to be more precise and convenient. Recovery usually occurs within minutes. Tiletamine-Zolazepam - Tiletamine-zolazepam is a proprietary combination available for use as an anesthetic agent in cats and dogs. In many respects tiletamine-zolazepam can be considered to be similar to ketamine pre-mixed with diazepam. Tiletamine-zolazepam can be used successfully with or without xylazine in cattle. However, addition of xylazine to tiletamine-zolazepam lengthens duration of effect. Tiletamine-zolazepam has been given at 4.0 mg/kg IV to healthy untranquilized calves and found to cause minimal cardiovascular effects and provided anesthesia of minutes duration [38]. Xylazine (0.1 mg/kg IM) followed immediately by tiletamine-zolazepam (4.0 mg/kg IM) produced onset of anesthesia within 3 minutes and duration of anesthesia of approximately 1 hour [39]. Calves were able to stand approximately 130 minutes following injection. Increasing xylazine to 0.2 mg/kg IM increased duration of anesthesia and recumbency and the incidence of apnea [39]. The drugs can be administered intravenously. Xylazine can be given at 0.05 mg/kg IV followed by tiletamine-zolazepam at 1.0 mg/kg IV [34]. Propofol - Propofol is a nonbarbiturate, nonsteroidal hypnotic agent and can be used to provide brief periods of anesthesia. Economic considerations limit the applicability of propofol as it is an expensive drug to use in adult cattle. Inhalation Agents - Anesthesia can be induced by mask in calves weighing less than 150 kg. If a commercial mask is unavailable a mask can be made by cutting the bottom out of a one gallon plastic jug or other container of appropriate size and padding the edges with cotton and tape. The mask must fit tightly around the calf's muzzle to prevent inspiration of atmospheric air and dilution of anesthetic gases. Halothane and isoflurane are agents of choice for use in cattle because they give short induction and recovery times. Sevoflurane and desflurane are also excellent choices for mask induction but their use carries considerable expense. The addition of nitrous oxide to the gas mixture hastens induction. Unless its use is contraindicated, nitrous oxide may be used as 50% of the total gas flow with one of the inhalation agents for mask induction of calves and then discontinued after intubation. It is recommended that nitrous oxide be discontinued after induction to avoid its accumulation in the rumen. Normal oxygen flow rates during induction are 3-6 liters/minute. Normal vaporizer settings are 3-5% halothane or isoflurane and 5-7% for sevoflurane during induction. The higher flow rates and vaporizer settings are used for bigger calves. Maintenance Tracheal intubation is recommended in cattle to provide a secure airway and prevent aspiration of salivary and ruminal contents if passive regurgitation occurs. Several techniques (blindly, digital palpation, or direct laryngoscopy) can be used to accomplish intubation and the reader is referred to descriptions of those techniques. An endotracheal tube of appropriate size is inserted and manipulated into the larynx (Table 1). The technique is similar to that performed in small ruminants [4-8,40]. Body Weight (kg) Endotracheal Tube Size (mm id.) < > >
4 Anesthesia in cattle can be maintained with halothane, isoflurane, or sevoflurane. Economic issues often dictate which agent is used. Conventional small animal anesthetic machines can be used to anesthetize calves weighing less than 40 kg. Conventional human anesthetic machines or small animal machines with expanded soda lime canisters are adequate for animals up to about 200 kg. Oxygen flow rates of 20 ml/kg/minute during induction and 12 ml/kg/minute during maintenance with minimal flow rates of 1 L/minute are adequate. Anesthesia is usually maintained with halothane at % or isoflurane at 1.5-3% or sevoflurane at 2.5-4%. Because cattle have a respiratory pattern characterized by rapid respiratory rate and small tidal volume, higher vaporizer settings (e.g., halothane 2-3%) may be required to maintain anesthesia in spontaneously breathing patients. Vaporizer setting can be decreased if controlled ventilation is used. Supportive Therapy Supportive therapy is an important part of anesthetic practice and can exert a strong influence on recovery and patient morbidity/mortality. Supportive therapy includes patient positioning, fluid administration, mechanical ventilation, cardiovascular support, good monitoring techniques, and oxygen administration to cattle under intravenous anesthesia. These techniques are addressed more completely in other chapters and other texts [4-8,41-43]. The reader is encouraged to consult those references for additional information. As with any species, good anesthetic techniques require monitoring to allow drug administration to meet the animal's requirements and prevent excessive insult to the cardiovascular, respiratory, central nervous, and musculoskeletal systems, thereby decreasing risk of complications. Monitoring techniques are similar to those employed in horses [4,6,44,45]. In healthy anesthetized adult cattle, heart rate is usually beats/minute. Animals that have received an anticholinergic will have an increased heart rate. Normal heart rate for calves varies with age. Younger calves will have a heart rate of beats/minute, decreasing as they mature. Pulse pressure can be ascertained by palpating the common digital, caudal auricular, radial, and saphenous arteries. Mucous membranes should be pink although the mucous membranes of some cattle are pigmented, making assessment difficult. Electrocardiography (ECG) is used with either standard limb leads (I, II, III) or a dipole lead for detection of cardiac rate and rhythm disturbances. Arterial pressure provides an accurate variable for assessing depth of anesthesia and can be monitored with either direct or indirect techniques. Normal arterial pressure values in anesthetized cattle are systolic pressure, mmhg; diastolic pressure, mmhg; and mean arterial pressure, mmhg; and exceed those of standing cattle [46]. The respiratory system is evaluated by monitoring respiratory rate and tidal volume. Spontaneous breathing rates are usually breaths/minute in adult cattle and usually breaths/minute in calves. Awake cattle have a decreased tidal volume when compared to horses and that relationship persists during anesthesia [47]. Normal arterial blood gas values for anesthetized cattle are similar to those of anesthetized horses. Respiratory gas analysis to determine end tidal CO 2 and anesthetic agent concentration can be performed to provide additional information. Care must be exercised during selection of agent analyzers. Ruminants often have detectable amounts of methane (and other gases) in their expired gas. Methane (and perhaps other gases) will be interpreted as the anesthetic agent by some infrared monitors and falsely report anesthetic concentration [48]. The central nervous system can be monitored by observation of ocular reflexes. The palpebral reflex disappears with minimal depth of anesthesia in cattle and is usually of no value during anesthesia. Dorsoventral rotation of the globe will occur as anesthetic depth changes in cattle [49]. The eyeball is normally centered between the palpebra. As anesthesia is induced the eyeball rotates ventrally, with the cornea being partially obscured by the lower eye lid. As depth of anesthesia is increased, the cornea becomes completely hidden by the lower eyelid; this sign usually indicates adequate depth of surgical anesthesia. A further increase in anesthesia is accompanied by dorsal rotation of the eyeball. Dorsal movement is complete when the cornea is centered between the palpebra; this sign indicates deep surgical anesthesia with profound muscle relaxation. During recovery eyeball rotation occurs in reverse order to that occurring during induction [49]. Nystagmus usually does not occur during anesthesia of cattle and when it does occur, can not be correlated with changes in depth of anesthesia. The corneal reflex should be present. Recovery Cattle recover well from general anesthesia and seldom experience emergence delirium or make premature attempts to stand. When an alpha-2 agonist is used as part of the anesthetic regimen, an antagonist can be used to hasten recovery [30,50,51] Extubation of cattle should not occur until the laryngeal reflex has returned and the animal begins to chew. If the patient has regurgitated the buccal cavity and pharynx should be lavaged to prevent aspiration of the material. In these instances, the endotracheal tube should be withdrawn with the cuff inflated in an attempt to remove any material that may have located in the trachea. Although cattle recover well from general anesthesia with minimal assistance, an attendant should be available. References 1. Bednarski RM, McGuirk SM. 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5 2. Tranquilli WJ. Techniques of inhalation anesthesia in ruminants and swine. Vet Clin N Am - Food Anim Pract Philadelphia: WB Saunders, 1986; 2: Short CE. Preanesthetic medications in ruminants and swine. Vet Clin N Am - Food An Pract Philadelphia: WB Saunders, 1986; 2: Riebold TW. Anesthetic techniques in ruminants. In: JC Thurmon, WJ Tranquilli, GJ Benson, eds. Veterinary Anesthesia, 3rd ed. Philadelphia: Lea and Febiger, 1996: Carroll, GL, SM Hartsfield. General anesthetic techniques in ruminants. Vet Clin N Am - Food An Pract 1996; 12: Riebold, TW, DR Geiser, DO Goble. Large Animal Anesthesia: Principles and Techniques. Ames, Iowa; Iowa State University Press Trim CM. Special anesthesia considerations in the ruminant. In: CE Short, ed. Principles and Practice of Veterinary Anesthesia. Baltimore: Williams and Wilkins, 1987; Hall LW, Clarke KW, and Trim CM. In: Veterinary Anaesthesia. 10th ed. Philadelphia: WB Saunders, Greene SA, Thurmon JC. Xylazine - a review of its pharmacology and use in veterinary medicine. J Vet Pharmacol Therap 1988; 11: Taylor PM. Anaesthesia in sheep and goats. Practice 1991; 13: Raptopoulos D, Weaver BMQ. Observations following intravenous xylazine administration in steers. Vet Rec 1984; 114: Fayed AH, Abdalla E B, Anderson RR, et al. Effect of xylazine in heifers under thermoneutral or heat stress conditions. Am J Vet Res 1989; 50: Symonds HW. The effect of xylazine upon hepatic glucose production and blood flow rate in the lactating dairy cow. Vet Rec 1976; 99: Symonds HW, Mallison CB. The effect of xylazine and xylazine followed by insulin on blood glucose and insulin in the dairy cow. Vet Rec 1978; 102: Eichner RD, Prior RL, Kvasnicka WG. Xylazine induced hyperglycemia in beef cattle. Am J Vet Res 1979; 40: Thurmon JC, Nelson DR, Hartsfield SM, Rumore CA. Effects of xylazine hydrochloride on urine in cattle. Aust Vet J 1978; 54: Hopkins TJ. The clinical pharmacology of xylazine in cattle. Aust Vet J 1972; 48: Uggla A, Lindqvist Å. Acute pulmonary oedema as adverse reaction to the use of xylazine in sheep. Vet Rec 1983; 113: LeBlanc MM, Hubbell JAE, Smith HC. The effect of xylazine hydrochloride on intrauterine pressure in the cow and the mare. In: Proceedings of the Ann Meeting Soc Theriogenol 1984; Jansen CAM, Lowe KC, Nathanielsz PW. The effects of xylazine on uterine activity, fetal and maternal oxygenation, cardiovascular function, and fetal breathing. Am J Obstet Gynecol 1984; 148: Jedruch J, Gajewski Z. The effect of detomidine hydrochloride Domosedan7 on the electrical activity of the uterus in cows. Acta Vet Scand 1986; 82 (suppl.): Krogh KM. Immobilisation of wild heifers with detomidine and detomidine combinations. In: Proceedings of the 7th World Cong Vet Anes 105, (Abstract)
6 23. Sharma SK, Nigam JM, Kumar A. Preliminary studies on the use of medetomidine in calves and its reversal by atipamezole. In: Proceedings of the 5th International Cong Vet Anes 1994; 121. (Abstract) 24. Celly, CS, McDonell WN, Black WD, Young S. Comparative cardiopulmonary effects of four α-2 adrenoceptor agonists in sheep. Vet Surg 1993; 22: (Abstract). 25. Thurmon JC. College of Veterinary Medicine. University of Illinois. Personal communication Kitzman JV, Booth NH, Hatch RC, Wallner B. Antagonism of xylazine sedation by 4-aminopyridine and yohimbine in cattle. Am J Vet Res 1982; 43, Thurmon JC, Lin HC, Tranquilli WJ, et al. A comparison of yohimbine and tolazoline as antagonist xylazine sedation in calves. Vet Surg 1989; 18: Ruckenbusch Y, Toutain PL. Vet Med Rev 1984; 5: Doherty TJ, Ballinger JA, McDonell WN, et al. Antagonism of xylazine-induced sedation by idazoxan in calves. Can J Vet Res 1987; 51: Raekallio M, Kivalo M, Jalanka H, Vaisio O. Medetomidine/ketamine sedation in calves and its reversal with atipamezole. J Vet Anaesthesia 1991; 18: Zahner JM, Hatch RC, Wilson RC, et al. Antagonism of xylazine sedation in steers by doxapram and 4- aminopyridine. Am J Vet Res 1984; 45: Chaplin MD, Roszkowski AP, Richards RK. Displacement of thiopental from plasma proteins by nonsteroidal antiinflammatory agents. In: Proceedings of the Soc Experim Biol Med 1973; 143: Blaze CA, Holland RE, Grant AL. Gas exchange during xylazine-ketamine anesthesia in neonatal calves. Vet Surg 1988; 17: Thurmon JC, Benson GJ. Anesthesia in ruminants and swine. In: JC Howard (ed.). Current Veterinary Therapy, Food Animal Practice 3rd ed. Philadelphia: WB Saunders, 1993; Grandy JL, McDonell WN. Evaluation of concentrated solutions of guaifenesin for equine anesthesia. J Am Vet Med Assoc 1980; 176: Wall R, Muir WW. Hemolytic potential of guaifenesin cattle. Cornell Vet 1990; 80: Thurmon JC, Benson GJ, Tranquilli WJ, Olson WA. Cardiovascular effects of intravenous infusion of guaifenesin, ketamine, and xylazine in Holstein calves. Vet Surg 1986; 15: Lin HC, Thurmon JC, Benson GJ, et al. The hemodynamic response of calves to tiletamine-zolazepam anesthesia. Vet Surg 1989; 18: Thurmon JC, Lin HC, Benson GJ, et al. Combining Telazol 7 and xylazine for anesthesia in calves. Vet Med 1989; 84: Hubbell JAE, Hull BL, Muir WW. Perianesthetic considerations in cattle. Comp Cont Ed Pract Vet 1986; 8:F92- F Wagner AE. Focused Supportive Care: Blood Pressure and Blood Flow during Equine Anesthesia. In: EP Steffey (ed.). Recent Advances in Anesthetic Management of Large Domestic Animals. International Veterinary Information Service 42. Daunt DA. Supportive therapy in the anesthetized horse. Vet Clin N Am - Eq Pract Philadelphia: WB Saunders. 1990; 6: Tranquilli WJ, Greene SA. Cardiovascular medications and the autonomic nervous system. In: CE Short, ed. Principles and Practice of Veterinary Anesthesia. Baltimore: Williams and Wilkins, 1987; Hubbell JAE. Monitoring. In: WW Muir and JAE Hubbell eds. Equine Anesthesia -- Monitoring and Emergency
7 Therapy. St. Louis: CV Mosby, 1991; Riebold, TW. Monitoring equine anesthesia. In: Principles and Techniques of Equine Anesthesia. Vet Clin N Am (Eq Pract). Philadelphia: WB Saunders Company. 1990; 6: Matthews NS, Gleed RD, Short CE. Cardiopulmonary effects of general anesthesia in adult cattle. Mod Vet Pract 1986; 67: Gallivan GJ, McDonell WN, Forrest JB. Comparative ventilation and gas exchange in the horse and cow. Res Vet Sci 1989; 46: Moens YPS. The reliability of recent monitoring developments in veterinary anaesthesia. In: Proceedings of the 5th International Cong Vet Anes 1994; Thurmon JC, Romack FE, Garner HE. Excursion of the bovine eyeball during gaseous anesthesia. Vet Med/Sm An Clin 1968; 63: Kruse-Elliott KT, Riebold TW, Swanson CR. Reversal of xylazine-ketamine anesthesia in goats. Vet Surg 1987; 16: Young DB, Shawley RV, Barron SJ. Tolazoline reversal of xylazine-ketamine anesthesia in calves. Vet Surg 1988; 18:171. All rights reserved. This document is available on-line at Document No. A
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