Incidence of pathologic postobstructive diuresis after resolution of ureteropelvic junction obstruction with a normal contralateral kidney

J. D. Roth, J. D. Lesier, J. T. Casey, Konrad Szymanski, Benjamin Whittam, R. Misseri, R. C. Rink, M. P. Cain

Research output: Contribution to journalArticle

Abstract

Introduction: Postobstructive diuresis (POD) after unilateral pyeloplasty or percutaneous nephrostomy (PCN) tube insertion for ureteropelvic junction obstruction (UPJO) in patients with a normal contralateral kidney is not well described. Objective: The objective of this study was to determine the incidence and characteristics of POD after relief of unilateral UPJO in patients with a normal contralateral kidney. Study design: Children who underwent a unilateral pyeloplasty or PCN for UPJO from 2010 to 2017 with a normal contralateral kidney were retrospectively reviewed. Postobstructive diuresis was defined as urine output (UO) of >300% of expected UO. Patients with a solitary kidney or those who underwent bilateral pyeloplasty or bilateral PCN tube placement were excluded. Results: Out of 396 children meeting inclusion criteria, seven (1.8%) developed POD (4 after pyeloplasty and 3 after PCN tube placement). Median age at intervention was 1.7 years (range 11 days–18 years); median weight was 11.4 kg (range 3.7–54.2 kg). Postobstructive diuresis was more likely to occur in patients with grade 4 hydronephrosis (3.0%) and larger kidneys and if a PCN tube was placed before pyeloplasty. There was no significant difference in age, gender, kidney laterality, or function between those who developed POD and those who did not. Postobstructive diuresis was managed with additional intravenous fluids and electrolyte monitoring. Median initial postprocedure UO was 5.9 mg/kg/hr (range 3.2–10.0 mg/kg/hr). In five children who underwent PCN in whom UO could be differentiated between kidneys, median initial postprocedure UO was 6.1 mg/kg/hr (range 2.5–9.1 mg/kg/hr) from the affected side and 0.8 mg/kg/hr (range 0.4–0.9 mg/kg/hr) from the unaffected side. The median length of time to resolution of POD was 3 days (range 2–4 days). One patient developed significant acidosis and lethargy that improved with intravenous fluid management. Mild hyponatremia developed in two, hypokalemia in one, hypophosphatemia in one, acidosis in one, and hypoglycemia in 1 patient. Discussion: A low but clinically significant risk of POD occurring after relief of unilateral UPJO in children with a normal contralateral kidney is described. Limitations include retrospective analysis and small sample size due to the rarity of the condition. Conclusion: Postobstructive diuresis after decompression of UPJO in patients with a normal contralateral kidney is a rare event (1.8%). However, POD does occur, and patients should be carefully monitored after these procedures given the potential for significant dehydration and electrolyte disturbances. [Table presented]

Original languageEnglish (US)
JournalJournal of Pediatric Urology
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Diuresis
Percutaneous Nephrostomy
Kidney
Incidence
Urine
Acidosis
Electrolytes
Hypophosphatemia
Lethargy
Hypokalemia
Hyponatremia
Hydronephrosis
Decompression
Dehydration
Hypoglycemia
Sample Size
Weights and Measures

Keywords

  • Hydronephrosis
  • Post-obstructive diuresis
  • Pyeloplasty
  • Ureteropelvic junction obstruction

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Urology

Cite this

Incidence of pathologic postobstructive diuresis after resolution of ureteropelvic junction obstruction with a normal contralateral kidney. / Roth, J. D.; Lesier, J. D.; Casey, J. T.; Szymanski, Konrad; Whittam, Benjamin; Misseri, R.; Rink, R. C.; Cain, M. P.

In: Journal of Pediatric Urology, 01.01.2018.

Research output: Contribution to journalArticle

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abstract = "Introduction: Postobstructive diuresis (POD) after unilateral pyeloplasty or percutaneous nephrostomy (PCN) tube insertion for ureteropelvic junction obstruction (UPJO) in patients with a normal contralateral kidney is not well described. Objective: The objective of this study was to determine the incidence and characteristics of POD after relief of unilateral UPJO in patients with a normal contralateral kidney. Study design: Children who underwent a unilateral pyeloplasty or PCN for UPJO from 2010 to 2017 with a normal contralateral kidney were retrospectively reviewed. Postobstructive diuresis was defined as urine output (UO) of >300{\%} of expected UO. Patients with a solitary kidney or those who underwent bilateral pyeloplasty or bilateral PCN tube placement were excluded. Results: Out of 396 children meeting inclusion criteria, seven (1.8{\%}) developed POD (4 after pyeloplasty and 3 after PCN tube placement). Median age at intervention was 1.7 years (range 11 days–18 years); median weight was 11.4 kg (range 3.7–54.2 kg). Postobstructive diuresis was more likely to occur in patients with grade 4 hydronephrosis (3.0{\%}) and larger kidneys and if a PCN tube was placed before pyeloplasty. There was no significant difference in age, gender, kidney laterality, or function between those who developed POD and those who did not. Postobstructive diuresis was managed with additional intravenous fluids and electrolyte monitoring. Median initial postprocedure UO was 5.9 mg/kg/hr (range 3.2–10.0 mg/kg/hr). In five children who underwent PCN in whom UO could be differentiated between kidneys, median initial postprocedure UO was 6.1 mg/kg/hr (range 2.5–9.1 mg/kg/hr) from the affected side and 0.8 mg/kg/hr (range 0.4–0.9 mg/kg/hr) from the unaffected side. The median length of time to resolution of POD was 3 days (range 2–4 days). One patient developed significant acidosis and lethargy that improved with intravenous fluid management. Mild hyponatremia developed in two, hypokalemia in one, hypophosphatemia in one, acidosis in one, and hypoglycemia in 1 patient. Discussion: A low but clinically significant risk of POD occurring after relief of unilateral UPJO in children with a normal contralateral kidney is described. Limitations include retrospective analysis and small sample size due to the rarity of the condition. Conclusion: Postobstructive diuresis after decompression of UPJO in patients with a normal contralateral kidney is a rare event (1.8{\%}). However, POD does occur, and patients should be carefully monitored after these procedures given the potential for significant dehydration and electrolyte disturbances. [Table presented]",
keywords = "Hydronephrosis, Post-obstructive diuresis, Pyeloplasty, Ureteropelvic junction obstruction",
author = "Roth, {J. D.} and Lesier, {J. D.} and Casey, {J. T.} and Konrad Szymanski and Benjamin Whittam and R. Misseri and Rink, {R. C.} and Cain, {M. P.}",
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T1 - Incidence of pathologic postobstructive diuresis after resolution of ureteropelvic junction obstruction with a normal contralateral kidney

AU - Roth, J. D.

AU - Lesier, J. D.

AU - Casey, J. T.

AU - Szymanski, Konrad

AU - Whittam, Benjamin

AU - Misseri, R.

AU - Rink, R. C.

AU - Cain, M. P.

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N2 - Introduction: Postobstructive diuresis (POD) after unilateral pyeloplasty or percutaneous nephrostomy (PCN) tube insertion for ureteropelvic junction obstruction (UPJO) in patients with a normal contralateral kidney is not well described. Objective: The objective of this study was to determine the incidence and characteristics of POD after relief of unilateral UPJO in patients with a normal contralateral kidney. Study design: Children who underwent a unilateral pyeloplasty or PCN for UPJO from 2010 to 2017 with a normal contralateral kidney were retrospectively reviewed. Postobstructive diuresis was defined as urine output (UO) of >300% of expected UO. Patients with a solitary kidney or those who underwent bilateral pyeloplasty or bilateral PCN tube placement were excluded. Results: Out of 396 children meeting inclusion criteria, seven (1.8%) developed POD (4 after pyeloplasty and 3 after PCN tube placement). Median age at intervention was 1.7 years (range 11 days–18 years); median weight was 11.4 kg (range 3.7–54.2 kg). Postobstructive diuresis was more likely to occur in patients with grade 4 hydronephrosis (3.0%) and larger kidneys and if a PCN tube was placed before pyeloplasty. There was no significant difference in age, gender, kidney laterality, or function between those who developed POD and those who did not. Postobstructive diuresis was managed with additional intravenous fluids and electrolyte monitoring. Median initial postprocedure UO was 5.9 mg/kg/hr (range 3.2–10.0 mg/kg/hr). In five children who underwent PCN in whom UO could be differentiated between kidneys, median initial postprocedure UO was 6.1 mg/kg/hr (range 2.5–9.1 mg/kg/hr) from the affected side and 0.8 mg/kg/hr (range 0.4–0.9 mg/kg/hr) from the unaffected side. The median length of time to resolution of POD was 3 days (range 2–4 days). One patient developed significant acidosis and lethargy that improved with intravenous fluid management. Mild hyponatremia developed in two, hypokalemia in one, hypophosphatemia in one, acidosis in one, and hypoglycemia in 1 patient. Discussion: A low but clinically significant risk of POD occurring after relief of unilateral UPJO in children with a normal contralateral kidney is described. Limitations include retrospective analysis and small sample size due to the rarity of the condition. Conclusion: Postobstructive diuresis after decompression of UPJO in patients with a normal contralateral kidney is a rare event (1.8%). However, POD does occur, and patients should be carefully monitored after these procedures given the potential for significant dehydration and electrolyte disturbances. [Table presented]

AB - Introduction: Postobstructive diuresis (POD) after unilateral pyeloplasty or percutaneous nephrostomy (PCN) tube insertion for ureteropelvic junction obstruction (UPJO) in patients with a normal contralateral kidney is not well described. Objective: The objective of this study was to determine the incidence and characteristics of POD after relief of unilateral UPJO in patients with a normal contralateral kidney. Study design: Children who underwent a unilateral pyeloplasty or PCN for UPJO from 2010 to 2017 with a normal contralateral kidney were retrospectively reviewed. Postobstructive diuresis was defined as urine output (UO) of >300% of expected UO. Patients with a solitary kidney or those who underwent bilateral pyeloplasty or bilateral PCN tube placement were excluded. Results: Out of 396 children meeting inclusion criteria, seven (1.8%) developed POD (4 after pyeloplasty and 3 after PCN tube placement). Median age at intervention was 1.7 years (range 11 days–18 years); median weight was 11.4 kg (range 3.7–54.2 kg). Postobstructive diuresis was more likely to occur in patients with grade 4 hydronephrosis (3.0%) and larger kidneys and if a PCN tube was placed before pyeloplasty. There was no significant difference in age, gender, kidney laterality, or function between those who developed POD and those who did not. Postobstructive diuresis was managed with additional intravenous fluids and electrolyte monitoring. Median initial postprocedure UO was 5.9 mg/kg/hr (range 3.2–10.0 mg/kg/hr). In five children who underwent PCN in whom UO could be differentiated between kidneys, median initial postprocedure UO was 6.1 mg/kg/hr (range 2.5–9.1 mg/kg/hr) from the affected side and 0.8 mg/kg/hr (range 0.4–0.9 mg/kg/hr) from the unaffected side. The median length of time to resolution of POD was 3 days (range 2–4 days). One patient developed significant acidosis and lethargy that improved with intravenous fluid management. Mild hyponatremia developed in two, hypokalemia in one, hypophosphatemia in one, acidosis in one, and hypoglycemia in 1 patient. Discussion: A low but clinically significant risk of POD occurring after relief of unilateral UPJO in children with a normal contralateral kidney is described. Limitations include retrospective analysis and small sample size due to the rarity of the condition. Conclusion: Postobstructive diuresis after decompression of UPJO in patients with a normal contralateral kidney is a rare event (1.8%). However, POD does occur, and patients should be carefully monitored after these procedures given the potential for significant dehydration and electrolyte disturbances. [Table presented]

KW - Hydronephrosis

KW - Post-obstructive diuresis

KW - Pyeloplasty

KW - Ureteropelvic junction obstruction

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