PP.277-278. Guinea Pig Neonates: Follow guidelines foradults. Immerse pup in ice water or crushed ice for 3 to 4 minutes. When fitted in custom made flexible Bain-type circuits they are sometimes suitable for stereotaxic frames. 5. Guidelines: Contact your area veterinarian with questions or for additional information. We are committed to protecting research participants, upholding ethical standards, and improving our practice at every step of our work. Fetuses should be euthanized by cold anesthesia on ice followed by decapitation using sharp scissors. E-Z Anesthesia http://www.ezanesthesia.com/ez_anesthesia/index.html. Immerse container holding pup in ice water or place on a barrier such as a glove or other water-proof material over crushed ice. Facility not large enough to hold your expanding transgenic colony? Example: A mouse weighing 25.0 grams receives 6 microliters of the above anesthetic mixture per gram body weight for a total of 0.150 mL of anesthetic mixture injected intraperitoneally. Once recovered, the pup is cleaned and rolled in a fecal bath to mask the smell of surgical interference before being returned to the mother. Immerse the container holding the pup into crushed ice or place the pup on a barrier, such as a glove or other water-proof material over crushed ice. These animals are small so practice makes perfect. Pup can be kept on cooling platform (i.e. 2. Belly begins to show fur; Day 9. Hypothermia allows less control of anesthetic depth compared to inhalant anesthesia. Guidelines: Consider providing warm subcutaneous (SQ) or intraperitoneal (IP) fluids, particularly for prolonged anesthetic events or animals that are ill, aged, or debilitated. Dose: Ketamine: 80-120 mg/kg; Xylazine: 5-10 mg/kgRoute: Intraperitoneal (IP)Duration: 30-45 minutesComments: Thermal support is crucial. Consequently, guidelines do not reference specific Mucous membrane color: Should be pink, not blue or gray. The blood collection method, interval between blood collection procedures, and volume of blood to remove must be listed in the approved protocol specific Istaphanous GK, Loepke, AW: General anesthetics and the developing brain. When used in combination (lidocaine plus bupivacaine in the same syringe), local anesthesia can have a fast onset with a relatively long duration of action. 6.1.4. Dosage. Apply ophthalmic ointment (e.g., Paralube® or Lacrilube®) to eyes if: Regardless of the anesthetic administered, monitor mice under anesthesia to avoid excessive depression of cardiac and respiratory functions, or insufficient anesthesia. Agent. Together they form a unique fingerprint. Neonates must receive analgesia if the procedure can reasonably be expected to result in enough pain to interfere with the neonatal function of sleeping and suckling. Exceptions may be considered, if the disturbance of neonate and dam in order to administer the medication interferes more than warranted with these functions. These procedures may help reduce dam cannibalizing or neglecting pups. Additional steps include exposing pups to soiled bedding from the mother’s cage, and placing the pup in the middle of the litter. Hypothermia should only be performed in neonatal rodents <7 days old and should not be used for procedures lasting longer than 30 minutes. 2009. Neonatal rodents may have a longer induction time than adult rodents with inhalant anesthesia. Neurosci. Induction of anesthesia with gas is typically achieved with < 2 min exposure to 3‐5% Isoflurane. FUp to P7 – No anesthesia/analgesia required FP7-12 – Anesthesia required FP13+ prohibited FFor ID purposes – justification required FAseptic technique – alcohol minimum FBleeding control – required FAs it has potential for pain/distress justification required P = Postnatal day Per NIH guidelines, decapitation alone for this age group is an acceptable means of euthanasia, no confirmation required MOUSE ANESTHESIA SOP 110.05 - Mouse Anesthesia Page 1 of 4 1. Genetic and pharmacologic manipulation of oxidative stress after neonatal hypoxia-ischemia. Other commonly used injectable agents are listed below. DJ Kohn, SK Wixon, WJ White, GJ Benson, Eds., Academic Press, 2008. Parameters that can be monitored in an anesthetized mouse without specialized equipment include: All species are at risk for hypothermia while under anesthesia. . Developmental changes of cardiac function and mass assessed with MRI in neonatal, juvenile, and adult mice. Fur is now thicker; Females may show nipples (there are five pairs of mammories) Day 10. Consequently, guidelines do not reference specific research-associated concerns. Exposure to isoflurane lasted 30 s. All the pups survived the anesthesia. Gentle handling for 5-minute intervals a few times a day. Int. The anesthetic event lasts longer than five minutes. The physiologic effects of isoflurane anesthesia in neonatal mice. What protocols for P0 mouse pup fixation work best to resolve CNS immunohistochemistry? For rodent use, dilute 1‐2% lidocaine to 0.5% and 0.5% bupivacaine to 0.25% to allow for feasible volumes to infuse at the incision site (1% solution is equal to 10 mg/mL). Cardio-pulmonary resuscitation and drugs to reverse anesthesia must be given or animal will die. Pre-anesthetic fasting is usually not necessary for mice due to their inability to vomit. Expect the birth of one pup every 15–30 ... (the latter is preferred if hypoxia alters the parameters to be tested in the mouse tissue) after delivery of her first pup. or gas anesthetic (isoflurane placed in cage for 1-2 minutes daily. "Toe clipping is no longer necessary" Neonate tattooing can be done without causing: pain, stress, or bleeding. Parenteral agents are not advisable in very young animals. Fox, James G. et.al. When using inhalant anesthesia, use a fume hood or an anesthetic system equipped with a gas scavenging system to minimize occupational exposure to exiting gases. It may help with dam accepting the pups back after the procedure if all vestiges of blood and disinfectant are removed from the pups by gently wiping them with a wet gauze pad before returning them to the dam. Stage 3 — surgical stage of anesthesia, with loss of reflexes, muscle relaxation, deep and rhythmic breathing, planes 1-4 (light to deep). Find general information on blood collection methods and recommended blood collection sites for common laboratory animals. IACUC oversee... Approved January 7, 2011, Reviewed July 2019. During the recovery phase, turn off inhalant gas before oxygen. Animals may be anesthetized for surgery, non-surgical procedures that may be painful, or non-painful procedures that require immobilization. Please use the IACUC Anesthesia and Surgical Monitoring Form for Rodents or a substantially similar form. Biomethodology and Surgical Techniques in The Mouse in Biomedical Research. Patients can be re-warmed on a circulating water blanket, heating pad (40°C), or in an incubator (33°C). Eyes are open; Pups begin to nibble solid food; Day 13. Intramuscular (IM) injections are not recommended in mice as it can result in complications such as tissue irritation, lameness, and self-mutilation. Injectable Anesthetic Agents for Neonatal Rats and MiceDo not use in pups <7 days old. Premedication was with carprofen 2.2 mg/kg SQ, hydromorphone 0.1 mg/kg IM, diazepam 0.2 mg/kg IM, and glycopyrrolate 0.01 mg/kg IM. Inhalant anesthesia may be safe both for ultra short (<5 minutes=”” and=”” prolonged=”” greater=”” than=”” 6=”” hours=”” procedures=”” for=”” longer=”” periods=”” of=”” anesthesia=”” it=”” may=”” be=”” necessary=”” to=”” ventilate=”” the=”” animal=”” sup=””>2, 6, 7. View the latest updates for researchers or visit our recovery toolkit. Induction: 6.1.4.1. See how the Office of Research Compliance (ORC) provides support for institutional committees and Marquette faculty, staff and students for research involving human subjects, animal subjects, radioisotope use and research with recombinant DNA (rDNA). Mice are particularly susceptible due to their high body surface area to body mass ratio. Anesthesia causes the loss of feeling in all or part of the body, with or without loss of consciousness. A thin material such as a latex glove, works better than a thicker material such as a neoprene glove. Surface cooling is effective due to their small surface area and body size. The surgical procedure is expected to take 10 to 15 min per pup, with a further 5 min for recovery. Wiesmann, Frank et.al. 2009 Jun; 22(3):368-73. References 1. There must be scientific justification for conducting tail snips on animals after 21 days and for not using analgesics. Acceptable Methods of Euthanasia Overdose of chemical anesthetics ( 2-3 times the anesthetic dose) Decapitation NOTE: you do not have to use CO 2 first. Anesth.Analg. Jan; 108(1):90-104. Anesthesia and Analgesia in Neonatal Mice and Rats. Loepke, AW et.al. Inject 50-150 mg/kg ketamine and 5-10 mg/kg xylazine with a 27G needle IP (max volume = 0.5 ml). Hypothermia Method: Mouse and rat pups up to 6 days of age may be anesthetized by hypothermia when inhalant anesthesia is not feasible. Bupivacaine has a slow onset (10-15 minutes), but is long-acting (4-8 hours). Or use the EZ-103A Microflex Breather and shave off a small amount to shorten the mask to fit the neonate. Never restrict water. Ketamine/xylazine cocktail* KX mouse cocktail 0.1mL/20g mouse wt. Analgesic Agents for Neonatal Rats and Mice, Administer a lower dose then would be administered to adult animals to start with. Gaertner et. **Anesthesia does not necessarily equate with analgesia! Hypothermia is appropriate for short, minor surgical procedures (5-15 minutes) in neonatal rats or mice up to 5 days of age. MOUSE ANESTHESIA SOP 110.05- Mouse Anesthesia Page 1 of 3 1. Routes of administration include topical to mucous membranes (nose, eye, etc. tribromoethanol Medicine & Life Sciences PURPOSE This Standard Operating Procedure (SOP) describes methods for anesthetizing mice. Do not use incandescent light during the procedure, as it can warm the surgical field and cause animals to awaken from a surgical plane of anesthesia. Fur growth is complete; Pups are more active; Day 11. Place the pup on the heated surface of the plastic. The vaporizer must be compatible with the specific inhaled anesthetic agent. 3. Never leave animal unattended during this time. BU IACUCInstitutional Animal Care and Use Committee Acetaminophen (0.1 ml PO of Children’s cherry flavored Tylenol Elixir) at 80 mg/2.5 ml once or twice a day may be acceptable and can be administered using a dropper or TB syringe.1, Boston University Research Support Repeat administration is not advisable.Hypothermia must be avoided by keeping the neonate warmed as described above. Tattoos are permanent and will not alter the physiology of your animals. Protect pup in a glove or paper-lined tube to avoid damageto the skin. Oxygen saturation and heart rate: Can be monitored using a specialized rodent pulse oximeter, and should be greater than 95% and between 300-800 beats/minute, respectively. Increasing the effectiveness of intracerebral injections in adult and neonatal mice: a neurosurgical point of view. Animals have reached the proper plane of anesthesia when pedal reflex is lost. This minimizes the risk of tracheal obstruction or pneumonia. Induction in a chamber generally requires 5% isoflurane, and maintenance (chamber or nose cone) requires 1-2% (flow rate = 0.5-1 L/min). : for a 25 gram mouse, the maximum volume would be 0.25 ml Rat 23‐25g < 10 ml/kg i.e. Inhalation anesthesia may be delivered by: Drop jar: Do not allow the mouse to come into direct contact with the liquid inhalant anesthetic (which can be achieved by placing a mesh grid over the cotton/gauze). Induction chambers, facemasks, and endotracheal tubes: These require gas anesthesia machines with an oxygen source and a precision vaporizer. For more information contact veterinary staff for assistance. Local anesthetics block nerve impulses by specifically binding the voltage‐gated Na+ channel in the nerve cell membrane. Induction: 6.1.4.1. Parenteral agents are not advisable in very young animals. Find guidelines for mouse anesthesia, including anesthetic drugs and procedures and special considerations for neonatal mouse anesthesia. • Day 10 pups were anesthetized and stabilized in a non-invasive manner and successfully injected using the PDMS device. Mice vary significantly in their sensitivity to various anesthetics. Go to “Breathing Devices” EZ-103A Microflex Breather. Neonatal Rodent Survival Surgery. General guidelines and considerations for mouse anesthesia. Only IP route of administration is allowed. Observe the pup closely. Recover anesthetized animals alone in a cage. Rapid onset, short duration. Neonates are defined as mouse or rat pups up to 10 days of age. SomnoSuite is our innovative low-flow anesthesia delivery system designed specifically for mice and rats. Hoff is a training technician at the University of Michigan, 1150 W. Medical Center Dr., 018 ARF, Ann Arbor, MI 48109-0614. Supplemental heat sources include circulating water blankets, electric heating pads, and commercial products that can be warmed in a microwave. old, general anesthesia and analgesia is required and only trained members should perform the procedure to ensure bone is not cut. Hypothermia allows less control of anesthetic depth compared to inhalant anesthesia. RAT AND MOUSE ANESTHESIA AND ANALGESIA Formulary and General Drug Information Approved: March 2nd, 2016 Definitions General Anesthesia: Loss of consciousness in addition to loss of sensation Analgesia: Loss of sensitivity to pain. Only for mice under 6 days of age Mouse pup must not be placed in direct contact with ice-water slurry Opioid analgesia Recommended: Buprenorphine 0.05 - 0.1 SC or IP For pain management after surgeries. Pups can be returned to dam once they are able to move without direct physical stimulation. Recover the neonate by holding it in your gloved hand or placing it in a Petri dish on a warm water circulating heating pad or under a heat lamp for less than 5 minutes and not too close to the lamp watching carefully to avoid overheating. Mouse, Rat and Hamster Neonates over 10 days of age: Follow guidelines for adults. Isoflurane is the preferred inhaled anesthetic. The mouse (Mus musculus) is currently the most popular laboratory animal in biomedical research. Lidocaine has a quick onset (1-2 minutes), but is short-acting (1-2 hours). Xylazine can be reversed with atipamizole (Antisedan®, 1-2 mg/kg SQ or IP), or yohimbine (Yobine®, 0.5-1 mg/kg IP). Isoflurane: 3-4% for induction and 1-3% for maintenance. Provide supplemental heat during all anesthetic events. Advantages: Rapid induction and recovery. Trained and experienced staff should perform decapitation. Return to top If additional anesthetic is needed, supplement with 1/3 dose of ketamine only. Neonates are defined as mouse or rat pups up to 10 days of age. Animals should not be placed directly on ice (use latex glove or another substance between the animal and the underlying ice bath). Body temperature: Can be monitored with a rectal thermometer, and should be above 97℉. Protect pup by placing into finger of a glove or paper lined test tube. Age, body composition, strain, health status, genetic manipulation, and sex are just a few factors that can contribute to anesthetic sensitivity. Immerse pup in ice water or crushed ice for 3 to 4 minutes. A 5-year-old male-castrated Cocker Spaniel presented to the Veterinary Teaching Hospital of the University of Georgia for a total ear canal ablation. Find guidelines for mouse anesthesia, including anesthetic drugs and procedures and special considerations for neonatal mouse anesthesia.Research Animal Resources (RAR) veterinary staff designed these guidelines to be general recommendations, not an inclusive list of all possible drug combinations that can be used in mice. Steps must be taken before, during, and after anesthesia to ensure animal safety and anesthesia efficacy. Hypothermia for Neonatal Anesthesia Hypothermia Ice-water slurry Once. Anesthesia was induced by placing the pup in a syringe and adding a volume of isoflurane-saturated gas that produced an estimated level of 32% isoflurane. The effects of neonatal isoflurane exposure in mice on brain cell viability, adult behavior, and memory. PURPOSE This Standard Operating Procedure (SOP) describes methods for anesthetizing mice. Starting with the lower dose range is recommended. Pre-anesthetic fasting is usually not necessary for mice due to their inability to vomit. Combined ketamine/xylazine is the preferred injectable anesthetic in mice. The ribs and skin are closed using 7‐0 sutures, and the pup is rapidly rewarmed with a supply of oxygen. Documentation is required for neonatal anesthesia, surgery and postoperative care. ), or an injection directly into tissues and around nerve bundles. mal, anesthesia is recommended when November 2000 Lab Animal Volume 29, No. Use of a fiber optic surgical lamp rather than an incandescent one minimizes surface warming and helps in maintaining hypothermia. One Silber Way, 9th floor, Boston, MA 02215. Once the measuring unit has heated to the temperature, remove the mouse pup from the cage and wipe the thorax with 70% ethanol sprayed on a wipe. 2006, Jan; 102(1):75-80. anesthesia is typically between 1.5‐3% Isoflurane. Advanced Research and Diagnostics Laboratory, Services for Researchers External to the University, Research & Support in the health sciences, special considerations for neonatal mouse anesthesia, IACUC guidelines on using hypothermia as anesthesia for neonatal rodents, Institutional Animal Care and Use Committee (IACUC), Research Occupational Health Program (ROHP). It is extremely important to accurately weigh the animal and calculate the correct dose. Administration of local anesthetics prior to the painful stimulus (e.g., incision) would be considered an adjunct analgesic to opioid and NSAID analgesics. Mouse eyes remain open under anesthesia. Visit Back2BU for the latest updates and information on BU's response to COVID-19. 20-30 minutes. Gas anesthesia (isoflurane) or hypothermia may be used to anesthetize neonatal rats and mice. This will avoid skin damage caused by direct contact with ice/cold water. Fingerprint Dive into the research topics of 'Refinements for embryo implantation surgery in the mouse: Comparison of injectable and inhalant anesthesias – tribromoethanol, ketamine and isoflurane – on pregnancy and pup survival'. 2. Hypothermia for induction: Place the pup in a nitrile glove finger and immerse the glove finger in crushed ice and water (2-3 °C or 35-37°F) up to the level of the head so that the head of the pup is visible. Recovery period may be prolonged. Hypothermia induces significant physiological stress on animals that can prolong recovery and potentially be fatal. 10 TECHNIQUE Methods of Blood Collection in the Mouse Janet Hoff, LVT, RLATG The author outlines various meth-ods of blood collection from mice. Rapid warming can cause tissue damage. It has rapid and reliable onset and recovery. 2. Mouse and electrode platform setup (electrode application) Recover neonate on home cage/dam bedding so as to make it smell similar to what it did before removal from cage. Due to the small respiratory capacity in mice, use a non-rebreathing system. A precision vaporizer provides the ability to precisely titrate the level of anesthesia during a procedure. The literature currently describe several anesthetic methods for use in neonatal rodents, including injectable anesthesia, inhalant anesthesia, and hypothermia. Animal Housing and Special Services Process: Submitting an ISR, Research Occupational Health Program (ROHP), Facilities and Administrative Costs and Analysis, Research Information Management System (RIMS), Find your Department and Research Administrators, Advisory Council for Research Administration (ACRA), Grant Management Training Videos and E-Learning, PAFO Onboarding Pack for Department Administrators, Information Systems and Web-Based Applications, Anesthesia and Analgesia: Neonatal Mice and Rats, Center for Antiracist Research Request For Proposals, Limited Submission Funding Opportunity: NEH American Rescue Plan: Humanities Organizations, Novartis Institutes for BioMedical Research Global Scholars Program 2021. Ketamine/xylazine* ketamine 80-100 mg/kg IP. In Anesthesia and Analgesia 2nd Ed. Anesthetic drugs can be administered parenterally or by inhalation. MOUSE ANESTHESIA AND ANALGESIA RECOMMENDATIONS 2 Non-painful procedures (e.g., imaging, restraint) Recommendations include: 1. Find services, facilities, and equipment for researchers. Feb. 2008. : for a 250 gram rat, the maximum volume would be 2.5 ml *Greater than the recommended volumes should not be given unless justified and approved on
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