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Urinary Tract Calculi I: Introduction

Urinary Tract Calculi I: Introduction

Renal calculi, or kidney stones, are solid deposits of minerals and salts formed inside the kidneys. In medical terminology, "calculus" refers to the stone itself, while "lithiasis" describes the process of stone formation. Depending on their location within the urinary system, these stones may be classified as either urolithiasis, when situated within the urinary tract, or nephrolithiasis, when located within the kidneys. Each term signifies the specific impact of the stone.Predisposition...

Urinary Tract Calculi III: Medical Management

Urinary Tract Calculi III: Medical Management

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)...

Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations

Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations

Renal calculi, commonly termed kidney stones, are crystalline solid masses that form in the kidneys but can occur at any point within the urinary system, encompassing the kidneys, ureters, bladder, and urethra.The pathophysiology of renal stones involves several key factors: supersaturation of the urine with stone-forming constituents, changes in urine pH, a decrease in urine volume, and the presence of substances that promote or inhibit stone formation.Supersaturation of Urine: This is the...

Urinary Tract Calculi VI: Surgical Management

Urinary Tract Calculi VI: Surgical Management

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...

Urinary Tract Calculi V: Nursing Management

Urinary Tract Calculi V: Nursing Management

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...

Urinary Tract Calculi IV: Nutrition Therapy and Prevention

Urinary Tract Calculi IV: Nutrition Therapy and Prevention

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,...

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Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

Published on: June 21, 2024

Bilateral urinary calculi with discordant stone composition.

Adam O Kadlec¹, Zachary C Fridirici, Alex M Acosta-Miranda

¹Department of Urology, Loyola University Medical Center, 2160 S. First Ave, Maywood, IL, 60153, USA, akadlec@lumc.edu.

World Journal of Urology

|June 8, 2013

Summary

A significant minority of kidney stone formers develop different stone compositions in each kidney. This may be due to local factors and impact preventive therapy effectiveness.

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Area of Science:

Nephrology
Urology
Biochemistry

Background:

Bilateral nephrolithiasis affects a substantial patient population.
Understanding stone composition is crucial for effective treatment and prevention.
Variations in stone composition within a single patient are not well-characterized.

Purpose of the Study:

To describe bilateral stone formers with differing stone compositions between renal units.
To compare characteristics of discordant versus concordant stone formers.

Main Methods:

Retrospective analysis of bilateral nephrolithiasis patients (2007-2010).
Categorization of stones by dominant mineralogical component (≥50%).
Comparison of patients with differing stone compositions (discordant) versus similar compositions (concordant) between kidneys.

Main Results:

25.4% of bilateral stone formers were discordant.
Calcium phosphate was the dominant component in 30% of discordant stones.
Discordant stone formers were younger, had better renal function, and a larger stone burden.

Conclusions:

A significant minority of bilateral stone formers exhibit distinct stone types in each kidney.
Local or micro-environmental factors may explain these compositional differences.
These variations might contribute to treatment resistance in some patients.