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Effect on physiological parameters and anaesthetic dose requirement of isoflurane when tramadol given as a continuous rate infusion vs a single intravenous bolus injection during ovariohysterectomy in dogs. PLoS One 2023; 18:e0281602. [PMID: 36753493 PMCID: PMC9907828 DOI: 10.1371/journal.pone.0281602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 01/27/2023] [Indexed: 02/09/2023] Open
Abstract
BACKGROUND Tramadol produces a significant reduction in both sevoflurane and isoflurane minimum alveolar concentrations in dogs under experimental conditions. This study aims to compare the effects of tramadol administered as a constant rate infusion (CRI) with those of tramadol administered as a single intravenous bolus on physiological parameters and isoflurane requirements in dogs undergoing ovariohysterectomy. METHODS In this study, forty female dogs undergoing ovariohysterectomy were enrolled. The bitches were anesthetized with 5 mg/kg of tiletamine/zolazepam combined with 0.05 mg/kg of acepromazine intravenously. Anesthesia was maintained with isoflurane delivered in 100% oxygen. The group A (n = 20) received tramadol 4 mg/kg in a single intravenous bolus, whereas the group B (n = 20) received tramadol 1.5 mg/kg in an intravenous bolus followed by tramadol 2.6 mg/kg/h as a CRI. The following parameters were recorded: heart rate, respiratory rate, non-invasive blood pressure, body temperature, EtCO2, SpO2 and inspired and expired concentrations of isoflurane. Parameter measurements were performed from pre-preedication (baseline) to skin suturing. RESULTS The dogs were healthy subjects that demonstrated no abnormalities on laboratory investigations. Significant tachycardia was recorded after administration of tiletamine/zolazepam combined with acepromazine in both groups. Heart rate decreased after intubation but remained significantly higher compared to baseline values in both groups. Systolic blood pressure significantly decreased in both groups but the recorded values were within the physiological range. Mild reduction in body temperature was recorded in both groups. SpO2 and EtCO2 remained within the physiological range. Isoflurane requirement was significantly lower in the group B compared to the group A. Transient twitching was recorded in two dogs belonging to the group A after tramadol administration. CONCLUSIONS Compared to tramadol given as a single intravenous bolus injection during ovariohysterectomy in dogs, tramadol administered as a CRI reduces isoflurane requirements in dogs anesthetized with tiletamine/zolazepam combined with acepromazine. Both tramadol given as a CRI and a single intravenous bolus injection, induce decrease in heart rate, respiratory rate and in body temperature but the values of these parameters remain within physiological range in dogs undergoing ovariohysterectomy.
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Ozawa S, Cenani A, Sanchez-Migallon Guzman Lv D. Treatment of Pain in Rabbits. Vet Clin North Am Exot Anim Pract 2023; 26:201-227. [PMID: 36402482 DOI: 10.1016/j.cvex.2022.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Rabbits occupy facets of veterinary medicine spanning from companion mammals, wildlife medicine, zoologic species, and research models. Therefore, analgesia is required for a variety of conditions in rabbits and is a critical component of patient care. Considerations when selecting an analgesic protocol in rabbits include timing of administration, route of administration, degree or anticipated pain, ability to access or use controlled drugs, systemic health, and any potential side effects. This review focuses on pharmacologic and locoregional management of pain in rabbits and emphasizes the need for further studies on pain management in this species.
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Affiliation(s)
- Sarah Ozawa
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, 1060 Williams Moore Dr, Raleigh, NC 27606, USA.
| | - Alessia Cenani
- Department of Surgical and Radiographical Sciences, School of Veterinary Medicine University of California Davis, One Shields Avenue, Davis, CA 95616, USA
| | - David Sanchez-Migallon Guzman Lv
- Department of Medicine and Epidemiology, School of Veterinary Medicine University of California Davis, One Shields Avenue, Davis, CA 95616, USA
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Ozawa SM, Graham JE, Guzman DSM, Tucker SM, Petritz OA, Sullivan P, Robertson JB, Hawkins MG. Clinicopathological findings in and prognostic factors for domestic rabbits with liver lobe torsion: 82 cases (2010–2020). J Am Vet Med Assoc 2022; 260:1334-1342. [DOI: 10.2460/javma.22.03.0154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
OBJECTIVE
To document clinicopathologic findings in domestic rabbits with liver lobe torsion and identify prognostic factors.
ANIMALS
82 rabbits.
PROCEDURE
Medical records of 4 institutions were reviewed to identify rabbits with an antemortem diagnosis of liver lobe torsion that were examined between 2010 and 2020.
RESULTS
The prevalence of liver lobe torsion was 0.7% (82/11,402). In all 82 rabbits, the diagnosis was made by means of abdominal ultrasonography. Fifty (60.1%) rabbits underwent liver lobectomy, 23 (28%) received medical treatment alone, and 9 (10.9%) were euthanized or died on presentation. Overall, 32 (39%) rabbits died within 7 days of initial presentation and 50 (61%) survived. Seven-day survival rate did not differ significantly between medical treatment alone and surgical treatment. However, median survival time following medical treatment (530 days) was shorter than that following surgical treatment (1,452 days). Six of 14 rabbits had evidence of systemic inflammatory disease on necropsy. Rabbits with right liver lobe torsion were less likely to survive for 7 days than were those with caudate torsions (P = 0.046; OR, 3.27; 95% CI, 1.04 to 11.3). Rabbits with moderate to severe anemia were less likely to survive for 7 days than were rabbits that were not anemic or had mild anemia (P = 0.006; OR, 4.41; 95% CI, 1.55 to 12.51). Other factors associated with a decreased 7-day survival rate were high heart rate at admission (P = 0.013) and additional days without defecation after admission (P < 0.001). Use of tramadol was associated with an increased survival rate (P = 0.018).
CLINICAL RELEVANCE
The prognosis for rabbits with liver lobe torsions was more guarded than previously described. Rabbits that underwent liver lobectomy had a longer median survival time than did rabbits that only received medical treatment.
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Affiliation(s)
- Sarah M. Ozawa
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC
| | | | | | - Samuel M. Tucker
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC
| | - Olivia A. Petritz
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC
| | | | - James B. Robertson
- Office of Research, College of Veterinary Medicine, North Carolina State University, Raleigh, NC
| | - Michelle G. Hawkins
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis, Davis, CA
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Abstract
With the increasing frequency of rabbits as veterinary patients, the expectation for high-quality, intensive veterinary care, and resultantly an understanding of anesthesia has been increasing. Sedation and general anesthesia are commonly required for many routine and emergency procedures in rabbits, and this results in the need for a strong awareness of anesthetic principles, knowledge of limitations of anesthesia, and maintenance of high standards of anesthesia.
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In Vitro and In Vivo Pharmaco-Toxicological Characterization of 1-Cyclohexyl-x-methoxybenzene Derivatives in Mice: Comparison with Tramadol and PCP. Int J Mol Sci 2021; 22:ijms22147659. [PMID: 34299276 PMCID: PMC8306156 DOI: 10.3390/ijms22147659] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/02/2021] [Accepted: 07/15/2021] [Indexed: 11/17/2022] Open
Abstract
1-cyclohexyl-x-methoxybenzene is a novel psychoactive substance (NPS), first discovered in Europe in 2012 as unknown racemic mixture of its three stereoisomers: ortho, meta and para. Each of these has structural similarities with the analgesic tramadol and the dissociative anesthetic phencyclidine. In light of these structural analogies, and based on the fact that both tramadol and phencyclidine are substances that cause toxic effects in humans, the aim of this study was to investigate the in vitro and in vivo pharmacodynamic profile of these molecules, and to compare them with those caused by tramadol and phencyclidine. In vitro studies demonstrated that tramadol, ortho, meta and para were inactive at mu, kappa and delta opioid receptors. Systemic administration of the three stereoisomers impairs sensorimotor responses, modulates spontaneous motor activity, induces modest analgesia, and alters thermoregulation and cardiorespiratory responses in the mouse in some cases, with a similar profile to that of tramadol and phencyclidine. Naloxone partially prevents only the visual sensorimotor impairments caused by three stereoisomers, without preventing other effects. The present data show that 1-cyclohexyl-x-methoxybenzene derivatives cause pharmaco-toxicological effects by activating both opioid and non-opioid mechanisms and suggest that their use could potentially lead to abuse and bodily harm.
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Zhang SY, Zhao H, Xu C, Zhang Q, Chen Y, Li HY, Zhang XL, Zhao C, Chen M, Yang DH. Combination of Dexmedetomidine and Tramadol in Patient-Controlled Intravenous Analgesia Strengthens Sedative Effect in Pregnancy-Induced Hypertension. Front Pharmacol 2021; 12:739749. [PMID: 34744722 PMCID: PMC8569426 DOI: 10.3389/fphar.2021.739749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 10/07/2021] [Indexed: 02/05/2023] Open
Abstract
Objective: The aim of the present study is to explore the combination of dexmedetomidine (DXM) and tramadol (TMD) on sedative effect in patients with pregnancy-induced hypertension (PIH). Methods: A total of 356 patients with pregnancy-induced hypertension (PIH) were randomly divided into three groups: DXM, TMD and DXM + TMD groups. These patients were treated with different doses of DXM, TMD or combination of DXM and TMD by a patient-controlled intravenous injection device. The scores of static pain and dynamic pain, sedation degree, and adverse reaction were recorded. The plasma levels of inflammatory mediators IL-10 and C-reactive protein (CRP), and the serum level of p-p38-MAPK were evaluated. Results: It was found that administration with DXM 1.0 µg/kg/h + TMD 700 mg and DXM 2.0 µg/kg/h + TMD 600 mg result in stronger sedative effect than single administration with DXM or TMD. The mean arterial pressure (MAP) and heart rate (HR) of patients with PIH were decreased with the combinational treatment of DXM and TMD. Interestingly, the PIH patients injected with DXM 1.0 µg/kg/h + TMD 700 mg and DXM 2.0 µg/kg/h + TMD 600 mg showed stronger sedative effect. In addition, the plasma level of level of IL-10 was increased and CRP decreased. The serum level of p-p38/MAPK was decreased. Conclusion: Taken together, our study indicates that combination of DXM and TMD effectively lowers blood pressure and reduces inflammation through increasing the level of IL-10, reducing CRP and inhibiting p-p38/MAPK in patients with PIH. This study suggests that the combination of DXM and TMD could be an anesthetic choice in the management of PIH.
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Affiliation(s)
- Shu-Yao Zhang
- Department of Pharmacy, Guangzhou Red Cross Hospital Jinan University, Guangzhou, China
| | - Hui Zhao
- Department of Gynecology and Obstetrics, The Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Chengcheng Xu
- Department of Pharmacy, Guangzhou Red Cross Hospital Jinan University, Guangzhou, China
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Qiuzhen Zhang
- Department of Pharmacy, Guangzhou Red Cross Hospital Jinan University, Guangzhou, China
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Yun Chen
- Department of Pharmacy, Guangzhou Red Cross Hospital Jinan University, Guangzhou, China
| | - Hai-Yan Li
- Department of Nursing, Guangzhou Red Cross Hospital Jinan University, Guangzhou, China
| | - Xia-Lan Zhang
- Department of Gynecology and Obstetrics, The Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Chengkuan Zhao
- Department of Pharmacy, Guangzhou Red Cross Hospital Jinan University, Guangzhou, China
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Meini Chen
- Department of Pharmacology, Shantou University Medical College, Shantou, China
| | - Dong-Hua Yang
- Department of Pharmaceutical Sciences, St. John’s University College of Pharmacy and Health Sciences, Queens, NY, United States
- *Correspondence: Dong-Hua Yang,
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Uscategui RA, Barros FF, Almeida VT, Kawanami AE, Feliciano MA, Vicente WR. Evaluation of chemical restraint, isoflurane anesthesia and methadone or tramadol as preventive analgesia in spotted pacas (Cuniculus paca) subjected to laparoscopy. Vet Anaesth Analg 2020; 48:82-91. [PMID: 33229231 DOI: 10.1016/j.vaa.2020.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 08/19/2020] [Accepted: 09/02/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To evaluate the efficacy and cardiopulmonary effects of ketamine-midazolam for chemical restraint, isoflurane anesthesia and tramadol or methadone as preventive analgesia in spotted pacas subjected to laparoscopy. STUDY DESIGN Prospective placebo-controlled blinded trial. ANIMALS A total of eight captive female Cuniculus paca weighing 9.3 ± 0.9 kg. METHODS Animals were anesthetized on three occasions with 15 day intervals. Manually restrained animals were administered midazolam (0.5 mg kg-1) and ketamine (25 mg kg-1) intramuscularly. Anesthesia was induced and maintained with isoflurane 30 minutes later. Tramadol (5 mg kg-1), methadone (0.5 mg kg-1) or saline (0.05 mL kg-1) were administered intramuscularly 15 minutes prior to laparoscopy. Heart rate (HR), respiratory rate, mean arterial pressure (MAP), peripheral oxygen saturation (SpO2), end-tidal CO2 partial pressure (Pe'CO2), end-tidal concentration of isoflurane (Fe'Iso), pH, PaO2, PaCO2, bicarbonate (HCO3-), anion gap (AG) and base excess (BE) were monitored after chemical restraint, anesthesia induction and at different laparoscopy stages. Postoperative pain was assessed by visual analog scale (VAS) for 24 hours. Variables were compared using anova or Friedman test (p < 0.05). RESULTS Chemical restraint was effective in 92% of animals. Isoflurane anesthesia was effective; however, HR, MAP, pH and AG decreased, whereas Pe'CO2, PaO2, PaCO2, HCO3- and BE increased. MAP was stable with tramadol and methadone treatments; HR, Fe'Iso and postoperative VAS decreased. VAS was lower for a longer time with methadone treatment; SpO2 and AG decreased, whereas Pe'CO2, PaCO2 and HCO3- increased. CONCLUSIONS AND CLINICAL RELEVANCE Ketamine-midazolam provided satisfactory restraint. Isoflurane anesthesia for laparoscopy was effective but resulted in hypotension and respiratory acidosis. Tramadol and methadone reduced isoflurane requirements, provided postoperative analgesia and caused hypercapnia, with methadone causing severe respiratory depression. Thus, the anesthetic protocol is adequate for laparoscopy in Cuniculus paca; however, methadone should be avoided.
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Affiliation(s)
- Ricardo Ar Uscategui
- Institute of Agrarian Sciences, Federal University of Jequithonha and Mucury Valleys (UFVJM), Unaí, MG, Brazil; Department of Veterinary Pathobiology and Theriogenology, São Paulo State University (Unesp), "Julio de Mesquita Filho", Jaboticabal, SP, Brazil.
| | - Felipe Fpc Barros
- Department of Medicine and Veterinary Surgery, Federal Rural University of Rio de Janeiro (UFRRJ), Seropédica, RJ, Brazil
| | - Vívian T Almeida
- Department of Veterinary Pathobiology and Theriogenology, São Paulo State University (Unesp), "Julio de Mesquita Filho", Jaboticabal, SP, Brazil
| | - Aline E Kawanami
- Department of Veterinary Pathobiology and Theriogenology, São Paulo State University (Unesp), "Julio de Mesquita Filho", Jaboticabal, SP, Brazil
| | - Marcus Ar Feliciano
- Department of Large Animal Clinic, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil
| | - Wilter Rr Vicente
- Department of Veterinary Pathobiology and Theriogenology, São Paulo State University (Unesp), "Julio de Mesquita Filho", Jaboticabal, SP, Brazil
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Evenson E, Mans C. ANTINOCICEPTIVE EFFICACY AND SAFETY OF SUBCUTANEOUS TRAMADOL IN CHINCHILLAS (CHINCHILLA LANIGERA). J Exot Pet Med 2019. [DOI: 10.1053/j.jepm.2018.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Benato L, Rooney NJ, Murrell JC. Pain and analgesia in pet rabbits within the veterinary environment: a review. Vet Anaesth Analg 2018; 46:151-162. [PMID: 30737017 DOI: 10.1016/j.vaa.2018.10.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 09/11/2018] [Accepted: 10/24/2018] [Indexed: 10/27/2022]
Abstract
OBJECTIVE To provide an overview of pain and analgesia in rabbits with the aim of developing a more accurate understanding of these topics. To illustrate and discuss the areas that have advanced in recent years and those that still require further research. DATABASES USED Three key subject resources were used: Web of Science, Medline and CAB Abstracts. Search terms were rabbits, lagomorphs, laboratory animals, pet, pain, surgical procedures, ovariohysterectomy, orchiectomy, castration, analgesia, opioids, and non-steroidal anti-inflammatory drugs. References from books and articles relevant to the topics were also included. CONCLUSIONS Rabbit medicine has improved over the last 20 years, but the literature suggests that pain management in this species is still inadequate and veterinary professionals believe their knowledge of pain and analgesia in this species is limited. Assessment and quantification of pain in rabbits can be challenging in a clinical environment not only because, as a prey species, rabbits tend to hide signs of pain but also because there are no validated methods to assess pain, except the Rabbit Grimace Scale, which is based on only one rabbit breed. Current consensus is that perioperative multimodal analgesia is the best practice. However, it is not widely used in rabbits. In rabbits, analgesia protocols and dosages reported in the literature are often poorly researched and do not result in complete pain amelioration with the return of normal. The present literature on rabbit pain and analgesia presents gaps either due to unexplored areas or insufficient findings. Further research should focus on these areas with the aim of improving the welfare of rabbits within a veterinary clinic.
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Affiliation(s)
- Livia Benato
- Animal Welfare and Behaviour, School of Veterinary Sciences, University of Bristol, Langford, UK.
| | - Nicola J Rooney
- Animal Welfare and Behaviour, School of Veterinary Sciences, University of Bristol, Langford, UK
| | - Jo C Murrell
- School of Veterinary Sciences, University of Bristol, Langford, UK
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Abstract
Managing pain effectively in any species is challenging, but small mammals present particular problems. Methods of pain assessment are still under development in these species, so the efficacy of analgesic therapy cannot be evaluated fully. Methods of assessing abdominal pain are established; however, applying these can be challenging. Alternative methods, using assessment of facial expression, may be more applicable to a range of painful procedures and across species. Multimodal and preventive analgesic strategies are most likely to be effective. Although data on analgesic dose rates are limited, sufficient information is available to enable analgesia to be provided safely.
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Affiliation(s)
- Paul Flecknell
- Comparative Biology Centre, Medical School, Newcastle University, Framlington Place, Newcastle NE24RU, UK; Flaire Consultants.
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EFFECTS OF TRAMADOL ON THE MINIMUM ANESTHETIC CONCENTRATION OF ISOFLURANE IN WHITE-EYED PARAKEETS (PSITTACARA LEUCOPHTHALMUS). J Zoo Wildl Med 2017; 48:380-387. [DOI: 10.1638/2016-0180r1.1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Szkutnik-Fiedler D, Grabowski T, Balcerkiewicz M, Michalak M, Pilipczuk I, Wyrowski Ł, Urjasz H, Grześkowiak E. The influence of a single and chronic administration of venlafaxine on tramadol pharmacokinetics in a rabbit model. Pharmacol Rep 2017; 69:555-559. [PMID: 31994089 DOI: 10.1016/j.pharep.2017.01.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 01/24/2017] [Accepted: 01/26/2017] [Indexed: 11/26/2022]
Abstract
BACKGROUND The combined use of tramadol with selective serotonin and norepinephrine reuptake inhibitors e.g. venlafaxine may be associated with serotonin syndrome. No previous studies exist examining the influence of a weak CYP2D6 inhibitor venlafaxine on the pharmacokinetics of tramadol. Therefore, the aim of this study was to determine the effect of a single and chronic administration of venlafaxine on the pharmacokinetics of tramadol using a rabbit model. METHODS Adult New Zealand white rabbits of both sexes (n = 21) were used. Animals received 100 mg of tramadol per os (one slow release tablet) and 75 mg of venlafaxine (one prolonged release capsule), and were divided into four groups: control group - a single dose of tramadol alone, 1 day group - a single dose of tramadol and venlafaxine, 7 and 14 days groups - seven and fourteen days administration of venlafaxine once daily plus a single dose of tramadol on the last day of the study. RESULTS Venlafaxine administration over a period of 7 and 14 days resulted in faster elimination of tramadol compared to the control group: significantly higher values of kel, and lower values of t1/2kel and MRT for the 7 and 14 days group were observed. Although no differences in bioavailability of tramadol were obtained. CONCLUSION Using a rabbit model, there is no evidence that the combined administration of tramadol and venlafaxine may increase the plasma exposure of tramadol and therefore increase the risk of serotonin syndrome.
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Affiliation(s)
- Danuta Szkutnik-Fiedler
- Department of Clinical Pharmacy and Biopharmacy, Poznan University of Medical Sciences, Poznań, Poland.
| | | | - Monika Balcerkiewicz
- Department of Clinical Pharmacy and Biopharmacy, Poznan University of Medical Sciences, Poznań, Poland
| | - Michał Michalak
- Department of Computer Sciences and Statistics, Poznan University of Medical Sciences, Poznań, Poland
| | - Irina Pilipczuk
- Department of Clinical Pharmacy and Biopharmacy, Poznan University of Medical Sciences, Poznań, Poland
| | - Łukasz Wyrowski
- Department of Clinical Pharmacy and Biopharmacy, Poznan University of Medical Sciences, Poznań, Poland
| | - Hanna Urjasz
- Department of Clinical Pharmacy and Biopharmacy, Poznan University of Medical Sciences, Poznań, Poland
| | - Edmund Grześkowiak
- Department of Clinical Pharmacy and Biopharmacy, Poznan University of Medical Sciences, Poznań, Poland
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Abstract
It is important that veterinarians treating exotic companion mammals stay abreast of the latest developments relating to medications and drug delivery approaches for safety, efficacy and welfare issues. Sustained release formulations of commonly used drugs as well as newer routes for administration of therapeutic agents allow the veterinarian treating exotic companion mammals to reduce the stress associated with drug administration. Interactions can occur between vehicle and drugs when formulations are compounded, therefore research studies are warranted regarding potential problems associated with these formulations.
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Affiliation(s)
- Michelle G Hawkins
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis, 2108 Tupper Hall, Davis, CA 95616, USA.
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Schnellbacher RW, Carpenter JW, Mason DE, KuKanich B, Beaufrère H, Boysen C. Effects of lidocaine administration via continuous rate infusion on the minimum alveolar concentration of isoflurane in New Zealand White rabbits (Oryctolagus cuniculus). Am J Vet Res 2014; 74:1377-84. [PMID: 24168301 DOI: 10.2460/ajvr.74.11.1377] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the effect of a continuous rate infusion (CRI) of lidocaine on the minimum alveolar concentration (MAC) of isoflurane in rabbits. ANIMALS Five 12-month-old female New Zealand White rabbits (Oryctolagus cuniculus). PROCEDURES Rabbits were anesthetized with isoflurane. Baseline isoflurane MAC was determined by use of the tail clamp technique. A loading dose of lidocaine (2.0 mg/kg, IV) was administered followed by a CRI of lidocaine at 50 μg/kg/min. After 30 minutes, isoflurane MAC was determined. Another loading dose was administered, and the lidocaine CRI then was increased to 100 μg/kg/min. After 30 minutes, isoflurane MAC was determined again. Plasma samples were obtained for lidocaine analysis after each MAC determination. RESULTS Baseline isoflurane MAC was 2.09%, which was similar to previously reported values in this species. Lidocaine CRI at 50 and 100 μg/kg/min induced significant reductions in MAC. The 50 μg/kg/min CRI resulted in a mean plasma lidocaine concentration of 0.654 μg/mL and reduction of MAC by 10.5%. The 100 μg/kg/min CRI of lidocaine resulted in a mean plasma concentration of 1.578 μg/mL and reduction of MAC by 21.7%. Lidocaine also induced significant decreases in arterial blood pressure and heart rate. All cardiopulmonary variables were within reference ranges for rabbits anesthetized with inhalation anesthetics. No adverse effects were detected; all rabbits had an uncomplicated recovery from anesthesia. CONCLUSIONS AND CLINICAL RELEVANCE Lidocaine administered as a CRI at 50 and 100 μg/kg/min decreased isoflurane MAC in rabbits. The IV administration of lidocaine may be a useful adjunct in anesthesia of rabbits.
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Affiliation(s)
- Rodney W Schnellbacher
- Department of Clinical Science, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506
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Abreu M, Aguado D, Benito J, Gómez de Segura IA. Reduction of the sevoflurane minimum alveolar concentration induced by methadone, tramadol, butorphanol and morphine in rats. Lab Anim 2012; 46:200-6. [DOI: 10.1258/la.2012.010066] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study aimed to estimate the reduction in the minimum alveolar concentration (MAC) of sevoflurane induced by low and high doses of methadone (5 and 10 mg/kg), tramadol (25 and 50 mg/kg), butorphanol (5 and 10 mg/kg) or morphine (5 and 10 mg/kg) in the rat. A control group received normal saline. Sixty-three adult male Sprague-Dawley rats were anaesthetized with sevoflurane ( n = 7 per group). Sevoflurane MAC was then determined before and after intraperitoneal administration of the opioids or saline. The duration of the sevoflurane MAC reduction and basic cardiovascular and respiratory measurements were also recorded. The baseline MAC was 2.5 (0.3) vol%. Methadone, tramadol and morphine reduced the sevoflurane MAC (low dose: 31 ± 10, 38 ± 15 and 30 ± 13% respectively; high dose: 100 ± 0, 83 ± 17 and 77 ± 25%, respectively) in a dose-dependent manner. The low and high doses of butorphanol reduced the sevoflurane MAC to a similar extent (33 ± 7 and 31 ± 4%, low and high doses, respectively). Two rats developed apnoea following administration of high-dose butorphanol and methadone. These anaesthetic-sparing effects are clinically relevant and may reduce the adverse effects associated with higher doses of inhalational anaesthetics.
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Affiliation(s)
- Mariana Abreu
- Department of Animal Medicine and Surgery, Veterinary Faculty, Complutense University of Madrid (UCM), Avda. Puerta de Hierro s/n, 28040 Madrid, Spain
- Department of Experimental Surgery, La Paz University Hospital, 28046 Madrid, Spain
| | - Delia Aguado
- Department of Animal Medicine and Surgery, Veterinary Faculty, Complutense University of Madrid (UCM), Avda. Puerta de Hierro s/n, 28040 Madrid, Spain
- Department of Experimental Surgery, La Paz University Hospital, 28046 Madrid, Spain
| | - Javier Benito
- Comparative Pain Research Laboratory, Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University (NCSU), Raleigh NC 27606, USA
| | - Ignacio A Gómez de Segura
- Department of Animal Medicine and Surgery, Veterinary Faculty, Complutense University of Madrid (UCM), Avda. Puerta de Hierro s/n, 28040 Madrid, Spain
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Itami T, Tamaru N, Kawase K, Ishizuka T, Tamura J, Miyoshi K, Umar MA, Inoue H, Yamashita K. Cardiovascular effects of tramadol in dogs anesthetized with sevoflurane. J Vet Med Sci 2011; 73:1603-9. [PMID: 21836387 DOI: 10.1292/jvms.11-0227] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Cardiovascular effects of tramadol were evaluated in dogs anesthetized with sevoflurane. Six beagle dogs were anesthetized twice at 7 days interval. The minimum alveolar concentration (MAC) of sevoflurane was earlier determined in each dog. The dogs were then anesthetized with sevoflurane at 1.3 times of predetermined individual MAC and cardiovascular parameters were evaluated before (baseline) and after an intravenous injection of tramadol (4 mg/kg). The administration of tramadol produced a transient and mild increase in arterial blood pressure (ABP) (P=0.004) with prolonged increase in systemic vascular resistance (SVR) (P<0.0001). Compared with baseline value, mean ABP increased significantly at 5 min (119% of baseline value, P=0.003), 10 min (113%, P=0.027), and 15 min (111%, P=0.022). SVR also increased significantly at 5 min (128%, P<0.0001), 10 min (121%, P=0.026), 30 min (114%, P=0.025), 45 min (113%, P=0.025) and 60 min (112%, P=0.048). Plasma concentrations of tramadol were weakly correlated with the percentage changes in mean ABP (r=0.642, P<0.0001) and SVR (r=0.646, P<0.0001). There was no significant change in heart rate, cardiac output, cardiac index, stroke volume, pulmonary arterial pressure, right atrial pressure and pulmonary capillary wedge pressure. In conclusion, the administration of tramadol produces a prolonged peripheral vascular constriction in dogs anesthetized with sevoflurane, which is accompanied with a transient and mild increase in arterial blood pressure. It also indicated that the degree of vasoconstriction might depend on the plasma concentration of tramadol.
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Affiliation(s)
- Takaharu Itami
- Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069–8501, Japan
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Abstract
Numerous analgesics are available for use in animals, but only a few have been used or studied in zoologic species. Tramadol is a relatively new analgesic that is available in an inexpensive, oral form, and is not controlled. Studies examining the effect of tramadol in zoologic species suggest that significant differences exist in pharmacokinetics parameters as well as analgesic dynamics. This article reviews the current literature on the use of tramadol in humans, domestic animals, and zoologic species.
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Affiliation(s)
- Marcy J Souza
- Department of Comparative Medicine, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA.
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Abstract
With the increasing popularity of rabbits as household pets, the complexity of diagnostic and surgical procedures performed on rabbits is increasing, along with the frequency of routine surgical procedures. More practitioners are faced with the need to provide adequate analgesia for this species. Preemptive analgesia prior to planned surgical interventions may reduce nervous system changes in response to noxious input, as well as reduce postoperative pain levels and analgesic drug requirements. Concurrent administration of analgesic drugs to anesthetized rabbits undergoing painful procedures is warranted both pre- and intraoperatively as well as postoperatively. This article discusses the neuropharmacologic and pharmacologic aspects of pain in rabbits, and reviews current protocols for the use of analgesic drugs.
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Affiliation(s)
- Linda S Barter
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, 2112 Tupper Hall, One Shields Avenue, Davis, CA 95616, USA.
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