correlation between transition zone index, uroflowmetry, residual urine, and other clinical parameters in patients with symptomatic benign prostatic hyperplasia

This study was conducted on a series of 88 consecutive patients with lower urinary tract symptoms suggestive of BPH. They were subjected to history taking [including the IPSS- symptom scores], physical examination [including digital rectal examination], biochemistry [including PSA], urinalysis and culture, urine cytology and uroflowmetry. The total prostate volume and the transition zone [TZ] volume were assessed by transrectal ultrasound using the ellipsoid formula. There were very slight differences between the correlation of the total prostate volume, transition zone volume and transition zone index and the clinical parameters. The estimation of the total prostate volume by TRUS proved to be a reasonable way to obtain the required information about prostate size and measuring TZ volume and the calculation of TZ index gave a limited additional value

Ultrasound assessment of postoperatpive residual urine volume improving accuracy through a new calculation method

Postmicturition catheterization is the usual method for assessment of postoperative residual urine volume. Ultrasonography, though non-invasive, comfortable and safe compared with catheterization, is still accused as being inaccurate. The present study attempted to revive the ultrasound method by improving its accuracy through the usage of the combined formulae for volume estimation of the ellipsoid utilizing the most reliable measurement parameters. One hundred and fifty postoperative female patients were investigated. The ultrasound-estimated volumes were compared with the actual volumes measured following catheterization. Nonsignificant differences were detected at volumes between 100 cc. and 300 cc. [P > 0.05]. Significant differences were detected at urine volumes below 100 cc. [P < 0.01]. Such error was not due to missing positive cases [sensitivity 100%], but was due to underestimation in 8.9% of cases with urine volumes larger than 100 c.c. [specificity 91.1%]. Similarly, though the sensitivity of ultrasound was 100% at volumes above 300 c. c, significant differences were detected between ultrasonography and catheterization [P < 0.05]. This was due to overestimation in 2.1% of cases with urine volumes less than 300 cc [specificity 57.9%]. Through the usage of the present calculation method, ultrasonography may, therefore, be considered an accurate method of estimation of postoperative residual urine volume