NTCA - Rodents Flashcards

1
Q

Premed anaesthesia

A
  • Butorphanol, SC/IM/IP
  • Buprenorphine, SC/IM/IP
  • Midazolam + Ketamine combo
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2
Q

Induction

A
  • Ketamine, IM/IP
  • Isoflurane (chamber)
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3
Q

Maintenance anaesthesia

A

Isoflurane

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4
Q

Analgesia

A
  • Meloxicam, SC/PO
  • Buprenorphine, SC
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5
Q

Neutering - guinea pig

A
  • Flank ovariectomy - ventral recum tolerated well, quick, wounds on non-dependent surface
  • Routine spay unusual - to manage cystic ovarian disease, contraceptive problems
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6
Q

Cystic ovaries (guinea pig)

A
  • Hormonal implants (medical Tx) - pot causative factor for leiomyoma in already high risk case
  • Percutaneous drainage - risk of iatrogenic peritonitis, doesn’t address causative factors, high recurrence
  • Ovariectomy - easier in cystic cases, hysterectomy necessary if endometrial changes - large cysts may require drainage first
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7
Q

Ovariectomy (guinea pig)

A
  • Bilateral dorsal flank incisions - caudal to last rib + ventral to transverse processes
  • Traction to exteriorise mobile ovary, large cysts may require drainage first
  • Ligate ovarian pedicle cranially + uterine horn caudally
  • Use haemoclips/hand ligatures
  • Ovary removed by sharp excision + repeat for other side w/ second incision
  • Close muscle w/ cruciates (absorbable suture - vicryl)
  • Close subcuticular fat w/ crucites (monocryl)
  • Close skin w/ intradermals (monocryl) or w/ glue
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8
Q

Absorbable suture muscle closure (guinea pig)

A
  • Monocryl (poliglecaprone) - absorbable monfilament
    (Vicryl (polyglactin) occasional reactions seen in guinea pigs)
  • Cruciates
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9
Q

Subcuticular fat suture closure (guinea pig)

A
  • Monocryl
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10
Q

Skin suture closure (guinea pig)

A
  • Monocryl
  • Glue
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11
Q

Castration (guinea pig)

A
  • Abdo preferred - single incision in front of penis
    (Avoid scrotum to minimise post-op infection)
  • Incise skin (single incision 1 - 1.5 cm between umbilicus + penis), fat + linea alba separately
  • Midline bladder can be deflected to access inguinal region
  • Pressure applied to scrotum + fat pad can be visualised moving into abdomen
  • Gasp fat pad + exteriorise + attached testis
  • Break down gubernaculum + ligate spermatic cord
  • Repeat for other testis
  • Close linea alba, fat + skin separately w/ intradermals - monocryl
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12
Q

Spay (rat)

A
  • Flank/midline spay - routine to dec risk of mammary masses
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13
Q

Castration (rat)

A
  • Single scrotal tip incision
  • Ligate spermatic cord
  • Glue skin
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14
Q

Spay (mice, hamsters, gerbils)

A
  • Midline abdominal spay - haemoclips helpful, exteriorisation of ovary for ligation tricky
  • Ovarian cysts + neoplasia common in gerbils (same approach to Sx, can be drained to aid exteriorising ovaries)
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15
Q

Castration (mice, hamsters, gerbils)

A
  • Lateral incisions to scrotum
  • Ligate spermatic cord
  • Close tunic
  • Glue skin
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16
Q

Urolithasis - cystotomy

A
  • Clip + prepare from 1 inch cranial to umbilicus to perineum
  • Incise skin + linea alba from 1 cm caudal to umbilicus, extending caudally approx 1 cm
  • Reflect fat to visualise bladder + exteriorise it
  • Place swab cranially to maintain position of bladder + absorb any abdo fluid/urine
  • Incise bladder on craniodorsal aspect
  • Haemorrhage common + easily controlled w/ gentle pressure
  • Urolith identifiable w/ atraumatic forceps
  • Continuous inverting layer of absorbable monofilament (monocryl) in bladder wall, Lembert pattern, avoiding inner mucosa (partial thickness)
  • Pos double inverted layer in guinea pigs - reduces lumen size
  • Check for bladder leakage
  • Simple continuous appositional sutures in muscle layer + bury knot
  • Cruciates in fat
  • Intradermal sutures to close skin
  • Manage via restricting Ca oxalate in diet
17
Q
  • Scent gland excision (gerbil)
A
  • Neoplasia common in entire males
  • Excision where masses develop - wide clip, elliptical incision around entire mass + scent gland
  • Vessels ligated + elliptical skin incision closed w/ intradermals
  • Local splash block advised for analgesia
18
Q

Mammary gland neoplasia (rat)

A
  • Cabergoline (1 mL/kg once daily) - slows net growth
  • Prophylactic spay in young animals
  • Surgical excision if affecting normal activity
19
Q

Zymbal’s gland adenocarcinoma (rat)

A
  • Debulking (removing) - may improve comfort by removing ulcerating + confirm Dx
  • Palliation - Sx not curative, analgesia, potential steroids
20
Q

Tail amputation (degu)

A
  • Inappropriate handling -> degloving injury to tail (necrosis, lack of soft tissue)
  • Make staggered incision to create ventral flap of skin
  • Amputate bone where vertebrae vital
  • Close skin - may require external sutures
21
Q

Sx position (herbivores)

A
  • Put in reverse Trendelenburg position
  • Raise posture
  • Diaphragmatic contents aided