Gynecology Flashcards
What is the UVJ?
Urethrovesical junction
– where the Bladder meets the Urethra (NOT the ureters!)
The balance of what 2 pressures are the cause of urinary continence vs. incontinence?
Intra-urethral pressure must exceed intra-vesical pressure for urinary continence at rest.
What are Estrogen’s effects on urinary continence?
Estrogen increases intra-urethral pressure.
Lack of estrogen, decreases intra-urethral pressure, causing INcontinence at rest.
Internal vs. External urethral sphincter: which is continuously contracted, maintaining continence?
Internal urethral sphinctor is continously contracted & maintains intra-vesical pressure.
The External provides about 50% of urethral resistance & is second line of defense against incontinence
4 major types of incontinence
- Stress: urine loss w/ exertion/straining such as laughing, coughing, exercising. Ass’d w/ pelvic relaxation & displacement of urethrovesical junction.
- Urge: leakage due to involuntary & uninhibited bladder contractions; detrusor instability.
- Total: continuous leakage due to urinary fistula resulting from pelvic surgery or pelvic radiation.
- Overflow: poor/absent bladder contractions leading to urine retention & overdistension of bladder
Cotton swab test
Hypermobility = Stress incontinence
A swab is placed in the urethra to the bladder neck. Movement of the UVJ w/ Valsalva (straining) should be less than 30 degrees.
When pelvic relaxation results in hyper mobility of the bladder neck, there is a large change of UVJ w/ Valsalva
Cystometrogram – what is it & what’s it’s use?
Pressure sensors used to determine bladder & sphincter tone as bladder is filled w/ fluid.
Used to distinguish between genuine stress incontinence & detrusor instability.
Risk factors for stress incontinence?
Cause Pelvic Relaxation:
Childbirth, Aging, Genetics
Cause Chronic Increases in Intra-Abdominal Pressure:
- Constipation, chronic coughing (lung disease, smoking), chronic heavy lifting, obesity (worsens incontinence, doesn’t cause it)
Cause Weakening of Urethral Closing Mechanism:
- Estrogen deficiency (menopause), scarring, denervation, meds
Stress Incontinence diagnostic findings?
- Poor anatomic support w/ Cotton swab test, X-ray, or Urethroscopy
- Demonstratable leakage w/ stress (stress test or pad test)
- Normal urinalysis, Neuro exam, Cystometrogram or Urethrocystometry
- Negative Urine Culture
Common cause of stress incontinence?
Usually due to pelvic relaxation (i.e. w/ aging or childbirth) that results in a hyper mobile bladder neck or from intrinsic sphincter deficiency
Detrusor instability, o/w known as ____ incontinence.
Urge
– results from involuntary & uninhibited bladder contractions
Causes of urge incontinence?
- Idiopathic (most common)
- UTIs
- Bladder stones
- Cancer
- Diverticula
- Neurologic disordes (stroke, MS, Alzheimer’s, cerebrovascular accident)
Urge incontinence symptoms?
Urinary urge
- Frequency
- Nocturia
Meds that treat urge incontinence?
Anticholinergics (Imipramine, Tolterodine, Oxybutynin)
- can also use bladder training
- if neuro cause present, treat neurologic disorder
Total incontinence causes?
Usually Fistulas:
Vesicovaginal, Urethrovaginal, or Ureterovaginal
- caused by pelvic radiation & pelvic surgery in >95% of cases in U.S.
- in developing countries, usually attributable to obstetric trauma, leading to urinary fistula