武功密笈

小黃藏書

ª Definition:

ª Differential Diagnosis:

ª Investigation:

- Review of symptoms:

- General medical history: DM, vascular diseases, chronic lung diseases, or neurological

conditions (eg. multiple sclerosis, stroke, Parkinson’s disease, anomalies of the spine and

low back), etc.

- Past operative history

- Current medication: sedatives, alcohol, anticholinergic/drug with anticholinergic

properties, α-agonist, α-blocker, Ca⁺⁺-channel blocker, etc.

– Drugs with anticholinergic properties: antihistamines, antidepressant, antipsycotics,

opiates, antispasmodics, and drugs for Parkinson’s disease.

‚ Physical Examination:

- Check for possible underlying medical diseases

- PV: to evaluate urethral support with full bladder and standing position

- The patient’s complaint should be reproduced by the physician and confirmed with the

patient, particularly if surgery is contemplated.

ƒ U/A: to rule out infection, which can be associated with incontinence

„ Postvoid Residual Urine:

- Incomplete bladder emptying is a frequent cause of incontinence.

… Frequency/Volume Bladder Chart:

- Measurement: 24-hour urine output, total number of daily voids, average voided

volume, functional bladder capacity (largest volume voided in normal daily life)

- Normal Value:

¤ Daily urine output: 1500-2500 ml

¤ Total number of daily voids: 7 or 8

¤ Average voided volume: approximately 250 ml

¤ Functional bladder capacity: 400-600 ml

† Urodynamic Studies:

- Bladder filling test:

w Measurement: voiding volume, residual urine, and functional bladder capacity.

w Reading:

? Urge incontinence: urgency accompanying urine loss during bladder filling

‚ Stress incontinence: urine loss when abdominal pressure increases.

ƒ Mixed incontinence: the presence of both urge and stress incontinence

- Multichannel urodynamic studies:

a). Uroflowmetry

b). Cystometry: to measure pressure/volume relationship of bladder

w Two phases: filling cystometry and voiding cystometry

w Simple cystometry: measuring bladder pressure only during filling

w Subtracted cystometry:

° An attempt to measure the pressure exerted in the bladder by detrusor

total intravesical pressure (Pves), intra-abdominal pressure (Pabd),

to give true detrusor pressure (Pdet)

Pdet = Pves - Pabd

? Residual urine: < 50 ml

‚ First desire to void: occurring between 150-250 ml infused

ƒ Strong desire to void: not occurring until > 250 ml

„ Cystometric capacity : 400-600 ml

… Bladder compliance: between 20-100 ml/cm H₂O measured 60

seconds after reaching cystometric capacity

† No uninhibited detrusor contractions during filling, despite provocation

‡ No stress or urge incontinence demonstrated, despite provocation

ˆ Voiding occurs because of a voluntarily initiated and sustained

detrusor contraction

‰ Flow rate during voiding: > 15 ml/sec, with Pdet < 50 cm H₂O

c). Pressure-flow voiding studies

d). Urethral pressure profile:

w Generated by slowly pulling a pressure-sensitive catheter through the urethra

from the bladder, which is usually filled with a consistent volume of fluid

w Pclose = Pure - Pves

(Pclose: urethral closure pressure, Pure: urethral pressure, Pves: bladder pressure)

e). Leak-point pressure:

w The intravesical (or intra-abdominal) pressure measured at the moment that

stress incontinence occurs

ª Extraurethral Causes of Incontinence: (urine loss through abnormal opening)

· Worldwide, the most common cause of fistula: obstructed labor

surgery, malignancy, and radiotherapy

and formation of scar tissue

k Key points to closure of a vesicovaginal fistula:

wild mobilization of tissue planes, close approximation of tissue edges,

closure of the fistula in several layers, and meticulous attention to postoperative

bladder drainage for 10-14 days.

　

ª Stress Urinary Incontinence:

- A urodynamic diagnosis

- Demonstrable urinary leakage when intravesical pressure exceeds the maximum urethral closure pressure in the absence of a detrusor contraction

è Biobehavioral Model: ~ interaction of three variables

Á GSI caused by intrinsic sphincteric weakness or deficiency

- less common, and more challenging to treat

S Effective urethral closure is maintained by the interaction of extrinsic urethral support and intrinsic

urethral integrity

¬ Non-surgical management:

¥ Muscle strengthening: eg. Kegel exercise

¥ Drug therapy:

a). a -adrenergic drugs (possible complication: hypertension)

b). estrogen therapy: for postmenopausal women with urogenital atrophy

¥ Electrical stimulation

­ Surgical management:

¥ Anterior colporrhaphy:

° Indications: cystocele without significant stress incontinence

° Mechanism: to prevent excessive displacement of endopelvic fascia beneath the

urethra so that urethra can be closed during coughing or sneezing

° Methods:

a). simple plication of the bladder neck

b). elevation of the bladder neck by placating the fascia under the urethra

c). elevation and fixation of the bladder neck by passing sutures lateral to the

urethra and driving the needles anteriorly into the back of the pubic

symphysis for fixation

° Advantage:

a). Avoid abdominal incision.

b). Allow the operation to be performed in conjunction with other vaginal

surgery.

° Disadvantage: long-term success rate only 35-65%

¥ Operations to correct stress incontinence resulting from anatomic hypermobility

(retropubic bladder neck suspension, needle suspension procedures)

A. Retropubic urethropexy:

° Indication: stress incontinence with hypermobility of urethra/bladder neck

° Mechanism: to correct anatomic hypermobility of urethra/bladder neck

° Methods:

a). Marshall-Marchetti-Krantz operation:

periurethral fascia « back of pubic symphysis

b). Burch colposuspension:

fascia at the level of bladder neck « iliopectineal (Cooper’s) ligament

c). Turner-Warwick vagino-obturator shelf procedure:

endopelvic fascia and/or vagina « fasia of obturator internus muscle

° Advantage: long-term success rate 80-90%

° Complications:

a). urethral kinking or obstruction g voiding difficulty

b). osteitis pubis, when suture is put directly into the pubic symphysis

c). enterocele, uterine prolapse, vaginal vault eversion, when opening the

rectouterine pouch of Doaglas by pulling up on the ant. vagina and then

elevating the post. Vagina

„ Culdoplasty is recommended at the time of bladder neck suspension

to reduce the incidence of future prolapse

B. Transvaginal urethropexy (Needle suspension procedures):

° Indication: stress incontinence resulting primarily from anatomic hypermobility

of bladder neck and urethra

° Mechanism: suspension of the urethra and bladder neck through a technique

that involves passage of sutures between the vagina and ant. abdominal wall

° Advantage: simple, short operation duration

° Disadvantage:

a). 5-year success rate ? 50%

b). perforation of bladder of urethra

c). infection

d). granulation formation around sutures

e). prolapse development

f). chronic pulling pelvic pain created by suture material

g). nerve entrapment syndrome

¥ Operations to correct stress incontinence resulting from intrinsic sphincteric weakness

or dysfunction (sling operations, periurethral injections)

A. Sling operation:

° Indication: complicated stress incontinence, usually from intrinsic weakness

a). demonstrable stress incontinence with normal urethral support

b). stress incontinence with a low leak-point pressure

c). stress incontinence with very heavy occupational lifting

d). stress incontinence with severe chronic obstructive lung disease

e). stress incontinence with posthysterectomy vaginal vault eversion

° Mechanism:

a). creating some degree of outlet obstruction (major)

(compressing the urethral lumen at the level of the bladder neck to

compensate for a faulty urethral closure mechanism)

° Complication: obstructed voiding

B. Periurethral injection:

° Indication: intrinsic urethral failure

° Mechanism: injection of material around the periurethral tissue to facilitate their

coaptation under conditions of increased intra-abdominal pressure

° Material utilized:

Polytef, Contigen (allergic reaction < 3%), Teflon, etc.

° Long-term success rate: poorly studied

¥ Salvage operations (intentionally obstructive sling operations, implantation of an

artificial urinary sphincter, urinary diversion) ~ a last ditch effort for cure

ª Urinary Incontinence Caused by Detrusor Overactivity:

ª Mixed Incontinence:

k to treat urge incontinence first, and proceeding with surgery only if stress incontinence persists

　

ª Functional or Transient Incontinence:

Delirium