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Related Concept Videos

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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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A Methodological Protocol and Considerations for Transcranial Ultrasonic Stimulation in Exploratory Clinical Human Studies
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Optimisation of sonourethrography: the clamp method.

Juan de Dios Berná-Mestre1, Thierry Balmaceda2, Diego Martínez2

  • 1Department of Radiology, Virgen de la Arrixaca University Hospital, Ctra. Madrid-Cartagena, s/n, 30120, El Palmar, Murcia, Spain. mesjubermu@hotmail.com.

European Radiology
|December 17, 2017
PubMed
Summary

The clamp method offers a simple, effective, and painless approach for retrograde sonourethrography (RSUG) and contrast-enhanced voiding sonourethrography (CE-VSUG) in adult males. This technique improves the detection of urethral strictures compared to traditional methods.

Keywords:
Clamp methodSonourethrographyUltrasound contrastUrethral stenosisUrethrography

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Area of Science:

  • Urology
  • Medical Imaging
  • Diagnostic Techniques

Background:

  • Urethral strictures are a common urological condition requiring accurate diagnosis.
  • Traditional imaging methods like retrograde urethrography (RUG) and voiding cystourethrography (VCUG) have limitations in detecting certain strictures.
  • The transperineal approach offers a minimally invasive route for urethral imaging.

Purpose of the Study:

  • To describe and evaluate the clamp method for transperineal retrograde sonourethrography (RSUG) and contrast-enhanced voiding sonourethrography (CE-VSUG).
  • To assess the efficacy of the clamp method in diagnosing urethral strictures in male adults.
  • To compare the diagnostic capabilities of RSUG and CE-VSUG with conventional methods.

Main Methods:

  • A prospective study involving 113 male patients (14-86 years) with confirmed urethral strictures.
  • Sonourethrography using the clamp method was performed between 2011 and 2015.
  • Quantitative and qualitative variables were analyzed, with a comparative analysis using the McNemar test.

Main Results:

  • RSUG was successful in all 113 cases, detecting 49 anterior urethral strictures, including 5 missed by RUG (p < 0.05).
  • CE-VSUG was successful in 97 cases, identifying 82 posterior strictures, including 6 missed by VCUG (p < 0.05).
  • Retrograde bladder filling was achieved in approximately 6 minutes.

Conclusions:

  • The clamp method provides a simple, effective, and painless technique for RSUG and CE-VSUG, manageable by a single operator.
  • This method allows for the evaluation of urethromeatal alterations such as strictures, hypospadias, and meatotomy.
  • RSUG and CE-VSUG demonstrate superior sensitivity in detecting anterior and posterior urethral strictures, respectively, compared to RUG and VCUG.