Urinary Incontinence Workup

  • Author: Sandip P Vasavada, MD; Chief Editor: Edward David Kim, MD, FACS   more...
 
Updated: Apr 5, 2012
 

Approach Considerations

Patients with urinary incontinence should undergo a basic evaluation that includes a history, physical examination, and urinalysis. Additional information from a patient's voiding diary, cotton-swab test, cough stress test, measurement of postvoid residual (PVR) urine volume, cystoscopy, and urodynamic studies may be needed in selected patients. Videourodynamic studies are the criterion standard for the evaluation of an incontinent patient but are typically reserved for the evaluation of complex cases of stress urinary incontinence.

Most authorities agree that diagnosis from the history alone is not an adequate basis for surgical therapy.[47] A review of the role of patient history in the diagnosis of urinary incontinence showed that a history of stress incontinence carries a sensitivity of about 0.91, but specificity is only 0.51. Positive predictive values in the range of 0.75-0.87 have been reported for a history of stress incontinence.[48]

Sensitivity and specificity are worse if the history is indicative of urge or mixed incontinence. Because some believe that many failed stress incontinence procedures are the result of incorrect or incomplete diagnoses, improving on the positive predictive value of history alone seems worthwhile.

The more difficult question to answer is which battery of tests and examinations produces a high positive predictive value at the lowest cost and inconvenience to the patient. One study demonstrated the benefit of combining the following 4 factors to improve diagnostic accuracy:

  • Predominant stress incontinence history
  • Postvoid residual (PVR) volume of no more than 50 mL
  • Positive cough stress test
  • Functional bladder capacity of at least 400 mL

Complex urodynamic testing in patients with these factors confirmed the diagnosis of stress incontinence 97% of the time; however, 15% of these patients also had coexisting detrusor instability. The positive predictive value, if one considers mixed incontinence as a separate disorder, is 82%.

The essential issue seems to be the diagnosis of detrusor instability as a part of a mixed incontinence disorder. Therefore, adding cystometry to the battery of necessary tests seems logical in most instances.

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Emergency Department Workup

Urinary incontinence is not a common presenting complaint in the emergency department (ED); however, its presence is always abnormal. The role of the emergency physician is to rule out some of the serious causes such as cauda equina syndrome, cord compression, and paraspinal abscess. If such life-threatening conditions exist, the patient needs to be admitted for a complete workup of the disease entity.

Depending on the clinical presentation, the following basic tests may be useful[22] :

  • Obtain a urinalysis and urine culture
  • Hematuria should be evaluated with urinary cytological studies
  • Check serum electrolytes and calcium levels
  • Check blood urea nitrogen (BUN)/creatinine levels; decreased muscle mass in elderly patients may affect renal function measurement
  • Check glucose level, especially in diabetic patients or patients with polyuria or polydipsia

In addition, specialists consulted on cases of urinary incontinence may request a variety of urodynamic studies for diagnosing the underlying cause.[43, 49]

Imaging studies

In the ED setting, the following imaging studies are helpful for delineating serious causes of urinary incontinence, when appropriate[28, 43, 22] :

  • Spinal MRI should be performed for ruling out cord compression, cauda equina, or spinal abscess if symptoms support the diagnosis
  • Ultrasonography allows for evaluation of hydronephrosis, hydroureter, and urinary tract stones. Ultrasonography is noninvasive, widely available, and cost-effective
  • CT scans with or without contrast for renal calculi or pyelonephritis

Additional imaging studies that can aid in delineating the characteristics of urinary incontinence but are usually not ordered from an emergency perspective include the following:

  • Fluoroscopy and video urodynamics determines bladder, intra-abdominal, and urethral pressures. It is often a valuable tool in the evaluation of complex stress incontinence
  • Cystourethrography is a useful diagnostic adjunct in suspected cases of urinary tract fistulas
  • Intravenous pyelography (IVP) may differentiate between ureterovesical fistula and vesicovaginal fistula
  • Positive-pressure urethrogram is most useful for diagnosing urethral diverticulum
  • MRI is the most accurate technique for visualizing pelvic floor defects
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Urinalysis and Urine Culture

Urinary tract infection (UTI) can cause irritative voiding symptoms and urge incontinence. UTI can cause or contribute to urinary incontinence disorders in several ways. Local inflammation can serve as a bladder irritant, causing uninhibited bladder contractions. Endotoxins produced by some bacterial strains can have an alpha-blocking effect on the urethral sphincter, thereby lowering intraurethral pressures.

Postmenopausal women are especially susceptible to these effects on the urethra and bladder. Hypoestrogenism may enhance the effects. Postmenopausal women with UTI may present without the classic symptoms of irritation and pain. The predominant symptom in some patients may be the onset or the worsening of urge urinary incontinence.

A screening urinalysis is generally recommended as part of the testing of women for urinary incontinence. In postmenopausal women, a urine culture should also be done. Cultures may show bacterial growth in patients whose urinalysis shows little or no evidence of inflammation. Colony counts of less than 105/mL may be of significance in postmenopausal women and merit treatment.

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Urine Cytology

Patients with carcinoma in situ of the urinary bladder experience urinary frequency and urgency and show evidence of microscopic hematuria. Irritative voiding symptoms disproportionate to the overall clinical picture and/or persistent unexplained hematuria warrant urine cytology and cystoscopy. Other potential indications for this testing include bladder lesions and masses visible on cystourethroscopy.

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Renal Function Studies

BUN and creatinine levels should be checked when poor renal function, obstructed ureters, or urinary retention is suggested. This is especially important in the case of a stage III or stage IV cystocele.

In stage III cystocele, the bladder protrudes out of the vaginal introitus to greater than 1 cm outside of the hymenal ring upon abdominal strain; in stage IV cystocele, the bladder protrudes out of the vagina to greater than 3 cm from the hymen with the patient at rest (see the image below). When the bladder herniates out of the vagina, it may drag ureters with it. Both ureters can become trapped and obstructed at the bony pelvis, causing hydroureteronephrosis. This results in elevated BUN and azotemia.

This photo illustrates a variety of pelvic organ pThis photo illustrates a variety of pelvic organ prolapses, including grade-IV cystocele, uterine descensus, enterocele, and rectocele alone or in combination. In situations where a significant prolapse (eg, uterus, bladder) has occurred, evaluate for possible ureteral obstruction at the level of the pelvic inlet.
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Diabetes Testing

Testing for diabetes mellitus is not routine in the setting of urinary incontinence. However, it should be considered if polyuria and polydipsia are a part of the clinical picture or if diabetes risk factors are present.

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Urodynamic Studies

Urodynamics are a means of evaluating the pressure-flow relationship between the bladder and the urethra for the purpose of defining the functional status of the lower urinary tract. The ultimate goal of urodynamics is to aid in the correct diagnosis based on pathophysiology.

Simple urodynamic tests involve performing a noninvasive uroflow study, obtaining a postvoid residual (PVR) urine sample, and performing single-channel cystometrography (CMG). A single-channel CMG (ie, simple CMG) is used to assess the first sensation of filling, fullness, and urge. Bladder compliance and the presence of uninhibited detrusor contractions (eg, phasic contractions) can be noted during this filling CMG. A simple CMG may be performed using water or gas (carbon dioxide). Water is the most common filling medium.

Multichannel urodynamic studies are more complex than simple urodynamics and can be used to obtain additional information, including a noninvasive uroflow, PVR urine, filling CMG, abdominal leak-point pressure (ALPP), voiding CMG (pressure-flow), and electromyography (EMG). Water is the fluid medium used for multichannel urodynamics.

The most sophisticated study is videourodynamics, the criterion standard in the evaluation of a patient with incontinence. In this study, the following are obtained: noninvasive uroflow, PVR urine, filling CMG, ALPP, voiding CMG (pressure-flow), EMG, static cystography, and VCUG. The fluid medium used for videourodynamics is radiographic contrast.

Go to Urodynamic Studies for Urinary Incontinence for more information on this topic.

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Chain-Bead Cystography

The significance of this test is largely historical. Chain-bead cystography involves the passage of a radiopaque chain transurethrally, with a portion of the chain piled just within the bladder at the urethrovesical junction. Urethra and bladder neck mobility, the presence or absence of urethral funneling, and the posterior urethrovesical angle can be determined with this test.

Incontinence experts no longer use this test. Instead, less invasive techniques, including the cotton swab test, bladder neck ultrasound, video urodynamics, and dynamic pelvic floor magnetic resonance imaging (MRI), now are used to study bladder neck anatomy and function.

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Postvoid Residual Volume

Measurement of postvoid residual urine volume, using either a bladder ultrasonography or urethral catheter, may be a part of the evaluation for urinary incontinence of patients with apparent failure to empty the bladder completely. If the PVR urine volume is high, the bladder may be acontractile or the bladder outlet may be obstructed. Both of these conditions cause urinary retention from overflow incontinence. Go to Urodynamic Studies for Urinary Incontinence for more information on this topic.

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Cystoscopy and Urethroscopy

Cystourethroscopy allows an anatomical assessment of the bladder and the urethra. The precise role of cystourethroscopy in the evaluation of female urinary incontinence is controversial.

The general agreement is that cystoscopy is indicated for patients with persistent irritative voiding symptoms or hematuria, persistent postoperative incontinence, voiding dysfunction, and findings suggestive of a diverticulum or fistula. Obvious causes of bladder overactivity, such as cystitis, stone, and tumor, can be easily diagnosed. This information is important in determining the etiology of the incontinence and may influence treatment decisions.

Go to Cystoscopy and Urethroscopy in the Assessment of Urinary Incontinence for more information on this topic.

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Pessary Trial

A pessary trial may be useful in the preoperative evaluation of female patients who have severe pelvic organ prolapse but no complaints of urinary incontinence. After being fitted with a pessary, which effectively reduces her prolapse, the patient is asked to wear the pessary for a few days during usual activities.

In some instances, the patient may experience stress incontinence while using the pessary. Some experts consider this to be evidence of so-called occult or potential stress incontinence—in other words, that stress incontinence may develop after surgical correction of the prolapse in these patients, because kinking of the urethra and/or limitation of urethral mobility secondary to the large prolapse may contribute to their continence.

The preoperative diagnosis of potential stress incontinence prompts the surgeon to add an anti-incontinence procedure to the overall surgical management scheme.

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MRI and Ultrasonography

MRI remains investigational in the assessment of urinary incontinence. It is not used in clinical practice.

Ultrasonography (US) is a readily available and versatile tool that has many potential uses in urology and urogynecology.[50] However, it has only recently begun to be used in the evaluation of urinary incontinence, such as post-void residual urine volume determinations.

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Contributor Information and Disclosures
Author

Sandip P Vasavada, MD  Physician, Associate Professor of Surgery, Cleveland Clinic Lerner College of Medicine, Center for Female Urology and Genitourinary Reconstructive Surgery, The Glickman Urological and Kidney Institute; Joint Appointment with Women's Institute, Cleveland Clinic

Sandip P Vasavada, MD is a member of the following medical societies: American Urogynecologic Society, American Urological Association, International Continence Society, Society for Urology and Engineering, and Society of Urodynamics and Female Urology

Disclosure: Pfizer Consulting fee Speaking and teaching; NDI Medical, LLC Ownership interest Review panel membership; AMS Consulting fee Consulting; allergan Consulting fee Speaking and teaching

Coauthor(s)

Maude E Carmel, MD, FRCSC  Fellow in Female Pelvic Medicine and Reconstructive Surgery, Glickman Urological and Kidney Institute, Cleveland Clinic

Maude E Carmel, MD, FRCSC is a member of the following medical societies: American Urological Association

Disclosure: Nothing to disclose.

Raymond Rackley, MD  Professor of Surgery, Cleveland Clinic Lerner College of Medicine; Staff Physician, Center for Pelvic Medicine and Pelvic Reconstruction, Glickman Urological Institute, Joint Appointment with Women's Institute Cleveland Clinic Foundation

Raymond Rackley, MD is a member of the following medical societies: American Urological Association

Disclosure: Pfizer, Novartis, Proctor & Gamble, Allergan Honoraria None; Pfizer, Novartis, Proctor & Gamble, Allergan Consulting fee Other

Chief Editor

Edward David Kim, MD, FACS  Professor of Surgery, Division of Urology, University of Tennessee Graduate School of Medicine; Consulting Staff, University of Tennessee Medical Center

Edward David Kim, MD, FACS is a member of the following medical societies: American College of Surgeons, American Society for Reproductive Medicine, American Society of Andrology, American Urological Association, Sexual Medicine Society of North America, and Tennessee Medical Association

Disclosure: Lilly Consulting fee Advisor; Astellas Consulting fee Speaking and teaching; Watson Consulting fee Speaking and teaching; Allergan Consulting fee Speaking and teaching

Additional Contributors

Peter MC DeBlieux, MD Professor of Clinical Medicine and Pediatrics, Section of Pulmonary and Critical Care Medicine, Program Director, Department of Emergency Medicine, Louisiana State University School of Medicine in New Orleans

Peter MC DeBlieux, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Emergency Medicine, American College of Emergency Physicians, American Medical Association, Radiological Society of North America, and Society of Critical Care Medicine

Disclosure: Nothing to disclose.

Farzeen Firoozi, MD Clinical Fellow, Center for Female Urology and Pelvic Reconstructive Surgery, Glickman Urological Institute, Cleveland Clinic Foundation

Farzeen Firoozi, MD is a member of the following medical societies: American Medical Association and American Urological Association

Disclosure: Nothing to disclose.

Michael S Ingber, MD Clinical Fellow, Glickman Urological and Kidney Institute of the Cleveland Clinic

Disclosure: Nothing to disclose.

Shunaha Kim-Fine, MD Fellow in Female Pelvic Medicine and Reconstructive Surgery, Mayo Clinic

Disclosure: Nothing to disclose.

Christopher J Klingele, MD, MS Assistant Professor of Obstetrics and Gynecology, Mayo Medical School; Consultant, Division of Gynecologic Surgery, Department of Obstetrics and Gynecology, Mayo Clinic

Disclosure: AMS - American Medical Systems Grant/research funds Multicenter research project on Miniarc pubovaginal sling for urinary incontinence

Nur-Ain Nadir, MD Clinical Assistant Instructor, Department of Emergency Medicine, State University of New York Downstate School of Medicine

Nur-Ain Nadir, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Emergency Medicine, Emergency Medicine Residents Association, and Society for Academic Emergency Medicine

Disclosure: Nothing to disclose.

Mark Jeffrey Noble, MD Consulting Staff, Urologic Institute, Cleveland Clinic Foundation

Mark Jeffrey Noble, MD is a member of the following medical societies: American College of Surgeons, American Medical Association, American Urological Association, Kansas Medical Society, Sigma Xi, Society of University Urologists, and Southwest Oncology Group

Disclosure: Nothing to disclose.

Olufunmilayo Ogundele, MD Clinical Assistant Instructor, Staff Physician, Departments of Emergency and Internal Medicine, State University of New York Downstate, Kings County Hospital Center

Olufunmilayo Ogundele, MD is a member of the following medical societies: American Medical Association and Society for Academic Emergency Medicine

Disclosure: Nothing to disclose.

Erik D Schraga, MD Staff Physician, Department of Emergency Medicine, Mills-Peninsula Emergency Medical Associates

Disclosure: Nothing to disclose.

Mark A Silverberg, MD, MMB, FACEP Assistant Professor, Associate Residency Director, Department of Emergency Medicine, State University of New York Downstate College of Medicine; Consulting Staff, Department of Emergency Medicine, Staten Island University Hospital, Kings County Hospital, University Hospital, State University of New York Downstate Medical Center

Mark A Silverberg, MD, MMB, FACEP is a member of the following medical societies: American College of Emergency Physicians, American Medical Association, Council of Emergency Medicine Residency Directors, and Society for Academic Emergency Medicine

Disclosure: Nothing to disclose.

Richard H Sinert, DO Associate Professor of Emergency Medicine, Clinical Assistant Professor of Medicine, Research Director, State University of New York College of Medicine; Consulting Staff, Department of Emergency Medicine, Kings County Hospital Center

Richard H Sinert, DO is a member of the following medical societies: American College of Physicians and Society for Academic Emergency Medicine

Disclosure: Nothing to disclose.

Kris Strohbehn, MD Professor of Obstetrics/Gynecology, Dartmouth Medical School; Director, Division of Urogynecology/Reconstructive Pelvic Surgery, Department of Obstetrics/Gynecology, Dartmouth-Hitchcock Medical Center

Kris Strohbehn, MD is a member of the following medical societies: American College of Obstetricians and Gynecologists, American College of Surgeons, American Urogynecologic Society, and Society of Gynecologic Surgeons

Disclosure: Astellas Grant/research funds Investigator

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment

Martha K Terris, MD, FACS Professor, Department of Surgery, Section of Urology, Director, Urology Residency Training Program, Medical College of Georgia; Professor, Department of Physician Assistants, Medical College of Georgia School of Allied Health; Chief, Section of Urology, Augusta Veterans Affairs Medical Center

Martha K Terris, MD, FACS is a member of the following medical societies: American Cancer Society, American College of Surgeons, American Institute of Ultrasound in Medicine, American Society of Clinical Oncology, American Urological Association, Association of Women Surgeons, New York Academy of Sciences, Society of Government Service Urologists, Society of University Urologists, Society of Urology Chairpersons and Program Directors, and Society of Women in Urology

Disclosure: Nothing to disclose.

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Urinary incontinence. Normal findings on urodynamic study of a 35-year-old white man. During the filling cystometrogram (CMG), there is absence of uninhibited detrusor contractions. Bladder compliance is normal. His maximum bladder capacity is 435 mL. During the pressure-flow study, his maximum flow rate (Qmax) is 25 mL/s and detrusor pressure at maximum flow rate (Pdet Qmax) is 50 cm H2O. The uroflow pattern is without abnormality, producing a bell-shaped curve without any abdominal straining. He voids to completion, and the postvoid residual urine is negligible.
Urinary incontinence. Urodynamic study revealing detrusor instability in a 75-year-old man with urge incontinence. Note the presence of multiple uninhibited detrusor contractions (phasic contractions) that is generating 40- to 75-cm H2O pressure during the filling cystometrogram (CMG). He also has small bladder capacity (81 mL), which is indicative of poorly compliant bladder.
Urinary incontinence. Urodynamic study revealing detrusor hyperreflexia in a 22-year-old woman with multiple sclerosis. Note the presence of multiple phasic contractions (uninhibited detrusor contractions) generating as much as 100 cm H2O pressure.
Urinary incontinence. Urodynamic recording of bladder outlet obstruction due to benign prostatic hyperplasia (BPH) in a 55-year-old man. Note that during a pressure-flow study, his maximum flow rate (Qmax) is only 6 mL/s and detrusor pressure at maximum flow rate (Pdet Qmax) is very high at 101 cm H2O. He also has a small bladder capacity (50 mL) due to chronic bladder outlet obstruction. His flow curve is flat and "bread-loaf" in pattern, which is consistent with infravesical obstruction.
Urinary incontinence. Urodynamic study revealing detrusor sphincter dyssynergia in a 35-year-old woman with C5 spinal cord injury. Note the absence of uninhibited detrusor contractions during the filling cystometrogram (CMG). Typically, patients with cervical cord lesions manifest detrusor hyperreflexia. However, this patient is taking Ditropan XL. Thus, phasic contractions are suppressed. During the pressure-flow study, note the increase in amplitude of the electromyogram (EMG) coincident with detrusor contraction and voiding. Her uroflow rate is low (1 mL/s), detrusor pressure is high (42 cm H2O), and the EMG recording is elevated.
Urinary incontinence. Video-urodynamic study illustrating type III stress urinary incontinence (intrinsic sphincter deficiency [ISD]) in a 65-year-old woman. Static cystogram reveals obvious contrast leakage via the urethra during Valsalva maneuver. Urodynamic study records abdominal leak point pressure (ALPP) of 55 cm H2O, consistent with ISD.
A cystoscopic view of the bladder mucosa reveals shallow ulcerations and petechial hemorrhages-findings consistent with bacterial cystitis.
A cotton swab angle greater than 30° denotes urethral hypermobility. Figure 1 shows that the cotton swab at rest is zero with respect to the floor. Figure 2 shows that the cotton swab at stress is 45° with respect to the floor.
A squirt of urine is observed at the peak of an increase in intra-abdominal pressure in a supine patient
This photo illustrates a variety of pelvic organ prolapses, including grade-IV cystocele, uterine descensus, enterocele, and rectocele alone or in combination. In situations where a significant prolapse (eg, uterus, bladder) has occurred, evaluate for possible ureteral obstruction at the level of the pelvic inlet.
 
 
 
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