Related Experiment Video
Updated: Aug 4, 2025
03:19
Author Spotlight: Developing a Bedside Protocol for Kidney and Genitourinary Ultrasonography
Published on: June 21, 2024
1.2K
Cupulolithiasis: A Critical Reappraisal
Olivia Kalmanson1, Carol A Foster1
1Department of Otolaryngology University of Colorado Anschutz SOM Boulder Colorado USA.
OTO Open
|March 31, 2023
Summary
Most benign paroxysmal positional vertigo cases involve freely moving otoconia, not cupulolithiasis. Canalith jam, not cupular adherence, explains prolonged apogeotropic nystagmus in horizontal canal BPPV.
Area of Science:
- Vestibular neuroscience
- Otolaryngology
- Neurology
Background:
- Benign paroxysmal positional vertigo (BPPV) is a common vestibular disorder.
- Theories of cupulolithiasis and canalith jam explain BPPV pathophysiology.
- Distinguishing between these theories is crucial for effective treatment.
Purpose of the Study:
- To review the historical and pathophysiological theories of cupulolithiasis and canalith jam.
- To clarify the mechanisms underlying benign paroxysmal positional vertigo.
- To provide evidence-based recommendations for diagnosis and treatment.
Main Methods:
- Comprehensive literature search of PubMed and Google Scholar.
- Keywords included "cupulolithiasis," "apogeotropic benign," and "canalith jam."
- Analysis of 187 unique full-text articles and inclusion of labyrinthine photographs of mouse utricles.
Main Results:
- Freely moving otoconial masses explain over 98% of BPPV cases.
- Evidence for persistent otoconial adherence to the cupula is lacking.
- Canalith jam, not cupulolithiasis, explains prolonged apogeotropic nystagmus; periampullary canalithiasis explains self-limited nystagmus.
Conclusions:
- Apogeotropic nystagmus is typically caused by mobile particles, not cupulolithiasis.
- Caloric testing and imaging can help differentiate jam from cupulolithiasis.
- Treatment should focus on clearing mobile particles, with canal plugging for refractory cases.
Related Concept Videos
01:25Urinary Tract Calculi VI: Surgical Management
13
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...
13
01:30Urinary Tract Calculi III: Medical Management
10
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)...
10
01:22Imaging Studies V: Intravenous Urography and Retrograde Pyelography
96
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...
96
01:28Urologic Endoscopic Procedure: Cystoscopic Examination
140
Meaning of Cystoscopic Examination:Cystoscopy is an essential diagnostic tool in urology that is used to assess the structure and function of the genitourinary system. It provides a direct view of the urethra, bladder, and, in some cases, the ureteral openings. This procedure helps detect structural abnormalities, infections, cancers, and blockages in the urinary tract. There are two types of cystoscopy:Flexible cystoscopy is commonly performed in outpatient settings due to its less invasive...
140
01:28Urinary Tract Calculi V: Nursing Management
15
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...
15
01:27Urinary Tract Calculi IV: Nutrition Therapy and Prevention
16
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,...
16