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Related Concept Videos

Urinary Tract Calculi VI: Surgical Management01:25

Urinary Tract Calculi VI: Surgical Management

139
Procedures for Kidney StonesMedical intervention is necessary when kidney stones or renal calculi are too large to pass spontaneously (typically greater than 5 millimeters) when stones are accompanied by symptomatic infection (such as fever or pyelonephritis), when they impair kidney function, or when they cause persistent symptoms like severe pain, nausea, or urinary retention. Additionally, patients with only one kidney or those who cannot be treated with medical management also require...
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Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

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The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
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Urinary Tract Calculi V: Nursing Management01:28

Urinary Tract Calculi V: Nursing Management

134
AssessmentSubjective Data: Obtain a detailed health history, including any recent or chronic urinary tract infections, periods of immobilization, previous episodes of renal calculi, and medical conditions such as gout, benign prostatic hyperplasia, or hyperparathyroidism. Review the medication history for drugs that may influence stone formation, including allopurinol, analgesics, loop diuretics, or thiazide diuretics. Document the use of long-term indwelling catheters and any past surgical...
134
Urinary Tract Calculi IV: Nutrition Therapy and Prevention01:27

Urinary Tract Calculi IV: Nutrition Therapy and Prevention

204
Management of renal calculi focuses on effective strategies like tailored nutrition and hydration therapy. Adjusting diet and fluid intake reduces stone formation and recurrence, making these interventions simple yet powerful in kidney stone prevention and management.Understanding Kidney StonesKidney stones form when calcium, oxalate, uric acid, and cystine concentrate and crystallize in urine. Factors contributing to their formation include genetic predisposition, certain medical conditions,...
204
Imaging Studies V: Intravenous Urography and Retrograde Pyelography01:22

Imaging Studies V: Intravenous Urography and Retrograde Pyelography

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IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
560
Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

142
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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Related Experiment Video

Updated: Nov 22, 2025

Technical Modification of the Terminal Ureter During Total Transperitoneal Laparoscopic Nephroureterectomy for Upper Urinary Tract Urothelial Carcinoma
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Can stone migration be predicted preoperatively in ureteroscopic lithotripsy?

Ahmet Arıman1, Erkan Merder1, Mehmet Ali Sezgin1

  • 1Urology Department, Health Science University, Prof Dr Cemil Taşcıoğlu City Hospital, Istanbul, Turkey.

Urologia
|January 11, 2021
PubMed
Summary

Ureter diameter greater than 7.45 mm predicts stone migration during ureteroscopic lithotripsy for mid and lower ureter stones. Stone size and surgeon experience also influence migration risk.

Keywords:
Ureter stonesstone migrationstone sizeureter diameterureteroscopy

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Area of Science:

  • Urology
  • Endourology
  • Nephrolithiasis Management

Background:

  • Ureteroscopic lithotripsy is a common procedure for kidney stones.
  • Predicting stone migration during the procedure is crucial for successful outcomes.
  • Identifying predictive parameters can optimize surgical planning and patient management.

Purpose of the Study:

  • To evaluate parameters predicting stone migration during ureteroscopic lithotripsy.
  • To determine the significance of ureter diameter in stone migration.
  • To establish a cut-off value for ureter diameter to predict migration.

Main Methods:

  • Patients undergoing ureteroscopic lithotripsy were divided into two groups: stone migration and no stone migration.
  • Proximal ureter diameters were measured using computed tomography (CT) scans.
  • Statistical analysis was performed to compare ureter diameters and identify a predictive cut-off value.

Main Results:

  • Significant differences in ureter diameters were observed between groups, particularly for mid and lower ureter stones.
  • Stone size was also a significant differentiating factor between patients with and without stone migration.
  • A ureter diameter cut-off value was determined to predict stone migration.

Conclusions:

  • A ureter diameter exceeding 7.45 mm is associated with a high possibility of stone migration for mid and lower ureter stones.
  • Stone diameter and surgeon experience are identified as effective factors influencing stone migration.
  • These findings can aid in predicting and managing stone migration during ureteroscopic procedures.