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Electrophysiological investigation of hydronephrosis in children
Insights
Congenital hydronephrosis in children shows discoordinated peristalsis and mild pelvioureteral junction obstruction. This leads to slight increases in intrapelvic pressure, particularly in severe cases.
Area of Science:
- Pediatric Urology
- Renal Physiology
- Surgical Science
Background:
- Congenital hydronephrosis is a common condition in children.
- Understanding the upper urinary tract's hydrostatics and dynamics is crucial for management.
- Previous studies have focused on anatomical changes, with less emphasis on functional dynamics.
Purpose of the Study:
- To investigate the hydrostatics and dynamics of the upper urinary tract in children with congenital hydronephrosis.
- To assess intrapelvic pressure and ureteral peristalsis during baseline and diuretic conditions.
- To identify potential functional obstructions within the pelvioureteral junction.
Main Methods:
- Intrapelvic pressure and bipolar electromyography were used in 12 children with congenital hydronephrosis.
- Studies were conducted intraoperatively under general anesthesia.
- Measurements were taken during baseline diuresis and furosemide-induced diuresis.
Main Results:
- Most hydronephrotic pelves had normal baseline pressures, but severe cases showed a trend toward increased pressure.
- Pressure increases during diuresis were similar in moderate and severe hydronephrosis.
- Peristaltic patterns exhibited discoordination in pelvis-conus transmission but preserved anterograde ureteral transmission.
Conclusions:
- A slight functional obstruction at the pelvioureteral junction is suggested.
- This obstruction correlates with observed peristaltic alterations and mild pressure elevations in severe congenital hydronephrosis.
Abstract:
The hydrostatics and dynamics of the upper urinary tract were studied in 12 children with congenital hydronephrosis by means of intrapelvic pressure and bipolar electromyography leads from the pelvis and ureter. Studies were performed intraoperatively with the child under general anesthesia. Measurements were obtained during a baseline period of normal diuresis and during diuresis induced by furosemide. The baseline pressure in the hydronephrotic pelvis was within normal limits in most cases but a tendency toward an increased mean baseline pressure was observed in severe hydronephrosis when the cases were grouped according to the excretory urogram. During diuresis the average pressure increase in severe hydronephrosis was parallel to that in moderate hydronephrosis. The peristaltic pattern showed discoordination in pelvis conus transmission but usually preserved anterograde transmission from the conus down the ureter. The results seem to indicate a slight functional obstruction at the pelvioureteral junction. This obstruction leads to the observed alterations in peristalsis and to a slight elevation of the intrapelvic pressure in more severe cases.