Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Urodynamic Studies: Uroflowmetry01:19

Urodynamic Studies: Uroflowmetry

6.4K
Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
6.4K
Imaging Studies VI: Voiding Cystourethrography and Cystography01:22

Imaging Studies VI: Voiding Cystourethrography and Cystography

2.9K
Voiding Cystourethrography (VCUG) and Cystography are specialized radiographic procedures used to examine the structure and function of the bladder and urethra.Voiding Cystourethrography (VCUG)A Voiding Cystourethrogram (VCUG) is a diagnostic imaging procedure that assesses the anatomy and function of the lower urinary tract. It focuses on the bladder, bladder neck, and urethra, helping detect abnormalities such as vesicoureteral reflux (VUR)—the backward or reverse flow of urine into the...
2.9K
The Micturition Reflex01:26

The Micturition Reflex

3.2K
Urination, or micturition involves the coordination of the bladder's detrusor muscle and two sphincters to ensure controlled bladder emptying.
The process begins with bladder filling, where the bladder wall stretches as urine accumulates. This stretching activates the urine storage reflex, mediated by the sacral spinal segments and the pontine storage center. Efferent sympathetic impulses stimulate the detrusor muscle to relax and the internal urethral sphincter to contract, facilitating...
3.2K
Urinary Bladder01:23

Urinary Bladder

4.0K
The urinary bladder is a hollow, muscular sac that temporarily stores urine before it is expelled from the body. It can hold approximately 600 mL of urine prior to micturition. The bladder is retroperitoneal and located behind the pubic symphysis in the pelvic floor.
In males, the bladder is situated in front of the rectum, while in females, it is positioned anterior to the vagina and uterus. The bladder floor contains an inverted triangular area called the trigone, defined by the two ureteric...
4.0K
Anatomy of the Genitourinary System II: Bladder and Urethra01:19

Anatomy of the Genitourinary System II: Bladder and Urethra

2.3K
The lower urinary system consists of the urinary bladder and urethra, which are essential in storing and expelling urine from the body. Together with the internal and external sphincters, these structures work together to regulate urination effectively.Anatomy of the BladderThe urinary bladder is a muscular, stretchable organ behind the pubic bone and in front of the rectum. In females, the bladder is positioned anterior to the vagina and inferior to the uterus, while in males, it is located...
2.3K
Underflow Gates01:30

Underflow Gates

481
Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
481

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Active surveillance could apply to one-quarter of Korean prostate cancer cases: Insights from a 27,075-patient cohort.

Prostate international·2026
Same author

Impact of repeated prostate-specific antigen testing on management patterns and personal healthcare spending for prostate cancer: A population-based study National Health Insurance data for 166,848 patients in South Korea from 2010 to 2020.

Investigative and clinical urology·2026
Same author

Surgical Efficacy of Robotic Adrenalectomy: Korean Nationwide Comparative Data Analysis Focusing on Robotic Modality, Surgical Approach, and Tumor Characteristics.

Journal of laparoendoscopic & advanced surgical techniques. Part A·2026
Same author

Incidence of High-Risk Prostate Cancer in Korea: Insights From Real-World Data Between 2010 and 2020.

Journal of Korean medical science·2026
Same author

Correction: Feasibility and safety of pure single-port robotic surgery using the "Integrated Functional Assistant Port" (iFAP) technique: a retrospective cohort study.

Journal of robotic surgery·2026
Same author

Does protocol heterogeneity in active surveillance influence clinical outcomes? Insights from a multicenter prostate cancer cohort.

Investigative and clinical urology·2026

Related Experiment Video

Updated: Mar 12, 2026

Detrusor Underactivity Model in Rats by Conus Medullaris Transection
03:26

Detrusor Underactivity Model in Rats by Conus Medullaris Transection

Published on: August 28, 2020

2.4K

Does uroflowmetry parameter facilitate discrimination between detrusor underactivity and bladder outlet obstruction?

Kwon Soo Lee1, Phil Hyun Song1, Young Hwii Ko1

  • 1Department of Urology, Yeungnam University College of Medicine, Daegu, Korea.

Investigative and Clinical Urology
|November 17, 2016
PubMed
Summary

The difference between maximal and average flow rate (DeltaQ) in uroflowmetry can help differentiate detrusor underactivity (DU) from bladder outlet obstruction (BOO) in men. This simpler method avoids discomfort associated with urodynamic studies.

Keywords:
Lower urinary tract symptomsUrinary bladder neck obstructionUrodynamics

More Related Videos

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
05:25

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing

Published on: August 14, 2019

20.4K
Nerve-sparing Mid-urethral Obstruction NeMO in Female Small Rodents
07:42

Nerve-sparing Mid-urethral Obstruction NeMO in Female Small Rodents

Published on: April 25, 2017

10.1K

Related Experiment Videos

Last Updated: Mar 12, 2026

Detrusor Underactivity Model in Rats by Conus Medullaris Transection
03:26

Detrusor Underactivity Model in Rats by Conus Medullaris Transection

Published on: August 28, 2020

2.4K
Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
05:25

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing

Published on: August 14, 2019

20.4K
Nerve-sparing Mid-urethral Obstruction NeMO in Female Small Rodents
07:42

Nerve-sparing Mid-urethral Obstruction NeMO in Female Small Rodents

Published on: April 25, 2017

10.1K

Area of Science:

  • Urology
  • Lower Urinary Tract Symptoms
  • Diagnostic Methods

Background:

  • Urodynamic study (UDS) is the standard for differentiating detrusor underactivity (DU) and bladder outlet obstruction (BOO).
  • Patient discomfort and potential complications limit UDS use.
  • Uroflowmetry offers a more accessible alternative for clinical practice.

Purpose of the Study:

  • To identify clinical variables from uroflowmetry that can discriminate between DU and BOO.
  • To establish a simpler diagnostic approach for lower urinary tract symptoms.

Main Methods:

  • Reviewed 240 men who underwent both UDS and uroflowmetry.
  • Analyzed uroflowmetry variables: maximal flow rate (Qmax), average flow rate (Qave), voiding volume (VV), postvoid residual urine (PVR), and DeltaQ (Qmax - Qave).
  • Utilized multivariable and receiver operating characteristic (ROC) curve analysis.

Main Results:

  • DeltaQ was significantly smaller in the DU group compared to the BOO group (5.26 mL/s vs. 8.71 mL/s).
  • Logistic regression identified DeltaQ and PVR as significant discriminators between DU and BOO.
  • ROC analysis showed DeltaQ had a higher area under the curve (0.806) for diagnosing DU than Qmax (0.763) and Qave (0.574).

Conclusions:

  • DeltaQ is a novel and effective predictor for discriminating DU from BOO in men.
  • Uroflowmetry parameters, particularly DeltaQ, can aid in distinguishing these conditions non-invasively.
  • This approach offers a more patient-friendly alternative to UDS.