Micturition

Question 1

Hypogastric n.

Answer 1

Sympathetic
alpha fibers contract internal sphincter
beta fibers relax the bladder
Also sensory for pain and overdistension

Question 2

Pelvic n.

Answer 2

parasympathetic
Ach contracts Detrusor muscle and contracts the bladder
Also sends sensory info about distension

Question 3

Pudendal n.

Answer 3

motor to external sphincter

Voluntary control

Question 4

symptoms of voiding disorders

Answer 4

stranguria
pollakiuria
diminished stream
POSTURES
inc. residual volume

Question 5

most common cause of storage disorders

and its treatment?

Answer 5

urethral sphincter mechanism incompetence (USMI)
young, middle aged spayed female dogs

treat with Phenylpropanolamine (PPA) (Alpha adrenergic agonist?) or Estrogen

Question 6

most common cause of voiding disorders?
signs?

and its treatment?

Answer 6

• Detrusor atony
  acquired post obstruction, or lower motor disease

*Larger SOFT bladder, easy to express
Stranguria with weak stream

Tx: Bethanechol - Parasympathomimetic 3 days after Catheter placement keep bladder small
DO NOT USE IF URETHRAL OBSTRUCTION IS PRESENT

Question 7

Urethrospasm

and treatment

Answer 7

relatively common post catheterization, especially in cats
Large FIRM bladder, stream suddenly stops

tx: alpha antagonist (Phenoxybenzamine, Prazosin, Tamulosin(Dogs Only) )

Question 8

Interneuron reflex with Lumbar injury

Answer 8

Pelvic n. senses distension and stimulates arch and Ach release from Pelvic n. Allowing Detrusor to contract some and Ext. Pudental to relax external sphincter
*But internal sphincter still closed

Question 9

physical obstruction

Answer 9

hyperkalemia!

bradycardia!

Question 10

hematuria without dysuria

Answer 10

renal neoplasia