VSR 421: Regional Veterinary Surgery (2+1)

URETHROTOMY

Indications

• Urethral obstruction

Radiagraph - showing presence of
urethal calculi 

Anesthesia control - In large animals

• Epidural anaesthesia
• Controlled in standing or dorsal recumbent state.

Site

• In dog-at the seat of obstruction (The commonest seat is behind the os-penis.

Placement of incision on penile urethra 

• In cattle
  • Sigmoid flexure : About 3 inches behind the scrotum along the median line.
  • Ischeal site: From 2 inches below the ischeal arch downwards along the medial line

Technique

Urtethrotomy 

In dog

• Catheter is passed through the urethral opening to the level of obstruction.
• Incise on the obstruction site.
• The calculi are picked up and removed

Calcli removed  from the urtethra

• Caetheter is passed into the bladder through the normal opening to ensure patency of passage.

Penile urtethratomy with the catheter

• The catheter is retained for a few days.

In cattle

• Post scrotal method
  • A midline incision 3 inches long is made about 3 inches behind the scrotum.
  • Retractor penis muscles reveal by dissecting areolar tissue or either side.
  • Body of penis is exposed.
  • Make an incision on the urethra along the exact midline.
  • Obstruction  is relieved and catheter is inserted for its patency
  • Thin plastic tube may be left insitu  for one or 2 days.
  • The wound is left open to heal by second intension.
• Ischeal urethrotomy
  • Two inches skin incision is made along the midline starting from about 2 inches below the ischial arch downwards
  • This exposes two retractor penis muscle.
  • Body of penis exposed, Palpate and incise the urethera along the exact midline
  • Obstruction  is relieved and thin plastic catheter may be left insitu for one or 2 days.
  • The wound is left open to heal by second intension.