Ultrasonographic studies of the lower urinary Tract, Anorectal

Tract and Pelvic Floor

p.bastani

Tabriz university of medical science

Two and Three-dimensional ultrasound imaging are gaining in popularity within the clinical setting and are sometimes replaced radiography in the evaluation of pelvic floor

disorders,because of :

·non invasiveness

·reproducibility

·nonradiation exposure

·and less expense

Many approaches have been proposed for the evaluation of the lower urinary tract by urltrasound. These include transabdominal, transrectal, perineal (or translabial )and

introital approachs .

*The examination can be performed in dorsal lithotomy .

Semi-recumbent or standing position .

*The image must be oriented in the sagittal position to obtain accurate data from symphsis pubis,urethra,bladder neck,

vagina, cervix,rectum and annual canal .

Ultrasonographic images of the female lower urinary tract

Ultrasound assessment of the Anterior Zonechange in urethral diameter during straining may be used to assess the integrity of the urethral and bladder neck closure mechanisms.

Bladder base descent greater than 10 mm and funnelling during straining might suggest a pubourethral (pul) defect.

Repeating this manoeuvre after unilateral anchoring at midurethra restores geometry and continence (petros & von Konsky)

Knowledge of the Middle zone and its relationship to the anterior and Posterior zones can be obtained by

observing changes in morphology During straining, coughing and after anchoring various connective

structures.

Ultrasound Assessment of the Middle Zone

overactive bladder

recurrent urinary tract diverticel

TVT-tape in the bladder 6 years after surgery

Ultrasonography after surgery

After anterior and middle zones defect repair withmesh, it can be accurately identified by Ultrasound

Pointing the probe more posteriorly, one can resualize the anus, rectum, longitudinal muscle of the anus

)LMA (and levator plate (lp)

Ultrasound assessment of posterior zone

The benefits are:

*Endosonography allows visualization of defects in the internal and external sphincters.

*Additionally the pictures obtained from endosonography provide a road map for repair of the sphincter.

Orientation of the probe in a female patient showingthe “U” sling of the puborectalis (PR) with vagina anterior

Complete division of the internal anal sphincterwith a defect (arrows) high in the canal at the level of the

puborectalis (PR)

benefits

Also with endosonography we can follow anal fistula .

If an external opening can be identified, some doctors will introduce hydrogen peroxide H2O2 (3-5%) in to opening immediately before acquiring a 2D or 3D data set. The H2O2 enhances the fistula tracts so that they appear bright with structures in the

ultrasound image .

Anorectal ultrasonography

*Endosonography is recognized as a valuable tool in the assessment of Anorectal problems .

* An endoanal probe must permit a 360° image mode and it must facilitate a high center

frequency .

*The probe head diameter should be relatirely small and cylindrical for maneavering the transducer in

the anal canal .

At last:

Ultrasound is a relatively inexpensive office tool which allows the clinician to determine the dynamic geometry of pelvic organs at rest. During effort, to identify the pelvic muscles, their movement relative to rest, and the location of implanted tapes and

meshes .