18. D Delirium
I Infection
A Atrophic urethritis and vaginitis
P Pharmacologic causes
P Psychological causes
E Excessive urine production
R Restricted mobility
S Stool impaction
Resnick NM, Yalla SV. Management of urinary incontinence in the
elderly. N Engl J Med 1985;313:800–805.
70. ApproximateNormalValues of FemaleBladder Function
• Residual urine <50 mL
• First desire to void occurs between 150 and 250 mL infused
• Strong desire to void does not occur until after 250 mL
• Cystometric capacity between 400 and 600 mL
• Bladder compliance between 20 and 100 mL/cm H2O measured 60 sec after reaching
cystometric capacity
• No uninhibited detrusor contractions during filling, despite provocation
• No stress or urge incontinence demonstrated, despite provocation
• Voiding occurs as a result of a voluntarily initiated and sustained detrusor contraction
• Flow rate during voiding is >15 mL/sec with a detrusor pressure of <50 cm H2O
Wall LL, Norton P, Delancey J. Practical urogynecology. Baltimore, MD: Williams & Wilkins,
1993.
120. An example is
Stamey operation
in which two Dacron
tubes (1 cm) are
used to give support
to the bladder neck
and to avoid the
sutures cutting
through the tissues.
2. Needle Bladder Neck
Suspension Operations
185. Procedure The median cure/dry rates at 48 months and
longer
colposuspension 84%
Minimal invasive transobturator sling procedures 83%
transvaginal needle suspensions 67%
anterior colporrhaphy 61%
Editor's Notes
The bladder dome is rich in parasympathetic muscarinic receptors (M) and sympathetic -adrenergic receptors ∝. The
bladder neck contains a greater density of sympathetic -adrenergic receptors 𝛽.
The inferior hypogastric plexus, also known as the pelvic plexus, is formed by visceral efferents from S2 to S4, which provide
the parasympathetic component by way of the pelvic nerves. The superior hypogastric plexus primarily contains sympathetic fibers
from the T10 to L2 cord segments and terminates by dividing into right and left hypogastric nerves. The hypogastric nerves and rami
from the sacral portion of the sympathetic chain contribute the sympathetic component to the pelvic plexus. The pelvic plexus divides
into three portions according to the course and distribution of its fibers: the middle rectal plexus, uterovaginal plexus, and vesical plexus.
Physiology of urine storage. Bladder distension from filling leads to: (1) -adrenergic contraction of the urethral smooth
muscle and increased tone at the vesical neck (via the T11-L2 spinal sympathetic reflex); (2) activation of urethral motor neurons in Onuf
nucleus with contraction of striated urogenital sphincter muscles (via the pudendal nerve); and (3) inhibited parasympathetic transmission
with decreased detrusor pressure. alpha adrenergic receptors; beta adrenergic; M muscarinic (cholinergic).
Onuf nucleus is found in the ventral horn gray matter of S2 through S4. This nucleus contains the neurons whose fibers
supply the striated urogenital sphincter. The urethrovaginal sphincter and compressor urethrae are innervated by the perineal branch of
the pudendal nerve. The sphincter urethrae is variably innervated by somatic efferents that travel in the pelvic nerves.
Physiology of urine evacuation. Efferent impulses from the pontine micturition center results in inhibition of somatic
fibers in Onuf nucleus and voluntary relaxation of the striated urogenital sphincter muscles. These efferent impulses also result in
preganglionic sympathetic inhibition with opening of the vesical neck and parasympathetic stimulation, which results in detrusor
muscarinic contraction. The net result is relaxation of the striated urogenital sphincter complex causing decreased urethral pressure,
followed almost immediately by detrusor contraction and voiding. alpha adrenergic receptors; beta adrenergic; M
muscarinic (cholinergic).
Striated urogenital sphincter anatomy. The perineal membrane is removed to show the three component muscles of the
striated urogenital sphincter. This sphincter receives most of its somatic innervation through the pudendal nerve.
(Fig. 23-9). In women who are hypoestrogenic, this submucosal
vasculature plexus is less prominent. In part, hormone replacement
targets this diminished vascularity and enhances coaptation
to improve continence.
Interpretation of multichannel urodynamic evaluation: cystometrogram. A catheter is placed in the bladder to determine
the pressure generated within it (Pves). The pressure in the bladder is produced from a combination of the pressure from the
abdominal cavity and the pressure generated by the detrusor muscle of the bladder. Bladder pressure (Pves) pressure in abdominal
cavity (Pabd) detrusor pressure (Pdet). A second catheter is placed in the vagina (or rectum if advanced-stage prolapse is present) to
determine the pressure in the abdominal cavity (Pabd). As room-temperature saline is instilled into the bladder, the patient is asked to
cough every 50 mL and the external urethral meatus is observed for leakage of urine around the catheter. The volume at first desire
to void and the bladder capacity is recorded. Additionally, the detrusor pressure (Pdet) channel is observed for positive deflections to
determine if there is detrusor activity during testing. The detrusor pressure (Pdet) cannot be measured directly by any of the catheters.
However, from the first equation, we can calculate the detrusor pressure (Pdet) by subtracting the abdominal pressure (Pabd) from the
bladder pressure (Pves):
Detrusor pressure (Pdet) bladder pressure (Pves) pressure in abdominal cavity (Pabd)
I. Urodynamic Stress Incontinence (USI)
Urodynamic stress incontinence is diagnosed when urethral leakage is seen with increased abdominal pressure, in the absence of detrusor
pressure.
a. USI (Column 1): Abdominal pressure is generated with Valsalva maneuver or cough. This pressure is transmitted to the bladder, and
a bladder pressure (Pves) is noted. The calculated detrusor pressure is zero. Leakage is observed, and diagnosis of USI is assigned.
b. No USI (Column 2): Abdominal pressure is generated with Valsalva maneuver or cough. This pressure is transmitted to the bladder,
and a bladder pressure (Pves) is noted. The calculated detrusor pressure is zero. Leakage is not observed. The patient is not diagnosed as
having USI.
II. Detrusor Overactivity (DO)
Detrusor overactivity is diagnosed when the patient has involuntary detrusor contractions during testing with or without leakage.
a. DO (Column 3): Although no abdominal pressure is observed, a vesicular pressure is noted. A calculated detrusor pressure is
recorded and noted to be present. A diagnosis of DO is made regardless of whether leakage is seen.
b. DO (Column 4): In this example, an abdominal pressure is observed as well as a vesicular pressure. Using only the Pabd and the Pves
channels, it is difficult to tell whether or not the detrusor muscle contributed to the pressure generated in the bladder. On subtraction, a
calculated detrusor pressure is recorded. Thus, a diagnosis of DO is made, again regardless of whether leakage is seen.
In addition to these channels, occasionally a channel to detect electromyographic activity is used.
Pabd pressure in abdominal cavity; Pdet detrusor pressure (calculated); Pves bladder pressure.