Lecture 4: Abdominal Anesthesia and Surgeries (Wronski) Flashcards Preview

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Flashcards in Lecture 4: Abdominal Anesthesia and Surgeries (Wronski) Deck (35):
1

3 borders of paralumbar fossa

1) cranial: last rib
2) dorsal: lateral border of large spinal muscles between last rib and tuber coxae
3) caudoventral: junction of tendinous and muscular parts of transversus abdominis m. between last rib and tuber coxae

2

nerve supply to paralumbar fossa

dorsolateral branch of spinal nerve

3

3 methods of desensitizing paralumbar fossa

1) epidural
2) paravertebral
3) inverted L (simplest method)

4

describe use of epidural to desenthesize paralumbar fossa

anesthetic agent is deposited in epidural space of vertebral canal

5

describe paravertebral method of desensitizing paralumbar fossa

anesthetic agent is deposited at cranial tips of lumbar transverse processes

6

describe inverted L method of desenstitizing paralumbar fossa

SQ injection of anesthetic agent cranial and dorsal to the site of incision

7

where is CSF located?

subarachnoid space

8

where is epidural space located?

in fat cells between bone and dura mater in the vertebral canal

9

3 nerves you want to block to paralyze paralumbar fossa **

T13, L1, L2

10

Rumenotomy =

surgical entry into the rumen

11

Entry into the rumen via paralumbar fossa would enter which sac of the rumen?

dorsal sac

12

Where is interarcuate space? Why is it important?

Space between L1 and L2. Where anesthesia should be deposited to anesthetize paralumbar fossa. (It will diffuse and anesthetize T13, L1, and L2).

13

If too much anesthetic is given during epidural, and it diffuses too far caudally, what happens?

Can anesthetize area of L4/L5, which contains roots of the femoral n., which is motor to the extensor mm. of stifle joint. Stifle will collapse.

14

Describe 3 injections given in paravertebral method of anesthesia to paralumbar fossa.

1) injection to cranial tip of transverse process of L1 to block T13
2) L2 to block L1
3) L4 to block L2

15

direction of external abdominal oblique fibers?

caudoventral

16

direction of internal abdominal oblique fibers?

cranioventral

17

What is a line block?

Same as inverted L block, but extends line further cranially instead of dorsoventrally

18

High vs. lumbosacral vs. low epidurals

High: b/w L1 and L2 to paralyze paralumbar fossa

lumbosacral: at L/S junction. Blocks femoral, sciatic, and obturator nn. and results in loss of motor and sensory fx

Low: at 1st intercoccygeal space. Blocks pudendal n. (sensory to perineal region). Used in parturition

19

Structures you have to go through before getting into abdominal cavity ***

1) skin
2) superficial fascia
3) cutaneous trunci
4) abdominal tunic
5) external abdominal oblique
6) internal abdominal oblique
7) transversus abdominis
8) retroperitoneal fat
9) parietal peritoneum

20

Grid technique

method used during sx in which abdominal muscles are cut along their natural fiber orientation

21

structures visualized on R lateral view of cow

omasum
abomasum
liver
descending duodenum
greater omentum (hides the other organs)
R lobe of pancreas

22

LDA

left displacement of abomasum. Abomasum displaces between the L body wall and rumen

23

what does "volvulus" mean?

twisting

24

2 methods to maintain abomasum in its proper anatomical position

1) abomasopexy (suture abomasal wall to parietal peritoneum)
2) omentopexy (suture greater omentum to muscles of abdominal wall near R paralumbar fossa)

25

structures visualized on R lateral view of horse

R dorsal colon
R ventral colon
cecum
liver
R kidney
descending duodenum

26

What structures are seen in R paralumbar fossa of cow?

descending duodenum, R lobe of pancreas

27

What structures are seen in L paralumbar fossa of horse?

L descending colon

28

where does apex of cecum lie in situ in horse?

along ventral midline. It is the first abdominal organ visualized during a ventral midline incision during Sx

29

common site of impaction in horse

pelvic flexure

30

what artery supplies the dorsal colon?

R colic a.

31

what artery supplies the ventral colon?

colic branch of ileocolic a.

32

nephrosplenic entrapment (LDDLC)

L dorsal displacement of large colon above nephrosplenic ligament. Spleen enlarges due to occlusion of blood supply, which traps colon even more firmly in place

33

Treatment for LDDLC

phenylephrine (vasoconstrictor) and trot the horse

34

Proper sites for liver biopsies in horses

R 12th intercostal space or L 8th intercostal space

35

Know bands/sacculations and organs that can/can't be rectally palpated pg. 7/8 of clinical correlates

:)

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