25. Inverted L paralumbar anaesthesia, anaesthesia of the distal limb via vascular (IV) infusion, anaesthesia of the horn (cornual nerve block) in cattle

Question 1

Inverted L- paralumbar anaesthetia?

Answer 1

Inverted L-paralumbar anaesthesia

Basic technique

• = Local block in tissue bordering
• Caudal aspect of the 13th rib and ventral aspect of transverse processes of the lumbar vertebrae
• Follow the line behind the last Thoracic vertebrae along the 13th rib and palpate the transverse processes of

lumbar vertebrates until tuber coxae and inject multiple injections in ‘’inverted L-line’’

Question 2

Advantages of Inverted L paralumbar anaesthetia?

Answer 2

Advantages

• Very simple (generally)
• Does not interfere with the patient’s locomotion
• Does not require in-depth knowledge of anatomy

Question 3

Disadvantages of inverted L paralumbar anaesthesia?

Answer 3

Disadvantages

• Peritoneum not properly anesthetized, prox/dist. better
• Multiple injection: more pain or more abscessation
• Excess anesthetic solution is used → healing abnormalities in the abdominal wall

Question 4

Indication Of distal limb anaesthetia?

Answer 4

Distal limb anaesthesia via Vascular (IV) Infusion

Indication

• Surgery distal to the fetlock joint: foot surgery or claw amputation
• Front or rear limbs

Question 5

Pre-infusion procedures of distal limb anaesthetia?

Answer 5

Pre-infusion procedures

• Lateral recumbency
• Positive leg restraint
• Preanesthetic sedation or analgesia
• Clean the area proximal to the fetlock joint
• Prepare the area: remove the hair, scrubbing etc.

Question 6

Materials of distal limb anaesthetia?

Answer 6

Materials

• Rubber tubing of adequate tensile strength to control vascularity of the distal limb
• 1 to 1.5-inch, 20 to 22G sterile disposable needle
• 20-ml syringe
• 2% lidocaine (no epinephrine, in abd you can use epi)

Question 7

Distal limb technique?

Answer 7

Technique

• Apply the rubber tubing around the metacarpal/tarsal region with a marked tension to make the vein more

visible.

• Allow time to visualize the vein

Question 8

Horn Block Indication and pre infusion procedures?

Answer 8

Anaesthesia of the horn (cornual nerve block) in cattle

Indication

• Cornuectomy

Pre-infusion Procedures

• Good standing restraint + head restraint
• Preanesthetic sedation or analgesia (hyperactive animals)
• Preparation: removal of hair, cleaning and disinfection

Question 9

Materials for horn block?

Answer 9

Materials

• 1.5-inch, 16- to 18G sterile needle
• 10-ml syringe
• 2% lidocaine (epinephrine optional)

Question 10

Technique for horn block?

Answer 10

Technique

• On the lateral edge of the frontal bone; palpate lateral canthus of the eye and the base of the horn: halve

the distance between these two points

• Insert needle (without the syringe at) under the frontal bone
• The depth of insertion: 1 cm (0.5 inches) in small animals 3 cm (1.5 inches) in large bulls
• Attach syringe and infuse 5-10 ml 2% lidocaine, continuing in a ventral and medial direction
• 5-10 min until effect is seen
• DOESN’T effectively anesthetize the skin so be careful not to damage it