Urethral Diameter
Urethral Diameter - Related Videos
05:09
Urethral Stricture Induction Followed by Buccal Mucosa Graft Urethroplasty in a Rat Model
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Cited by 3 •
2023
In the present protocol, a urethral stricture induction was developed in Wistar rats, followed by urethral reconstruction with a buccal mucosa graft. A retrograde urethrogram and laser Doppler assessment were performed, validating urethral reconstruction (after stricture formation) and graft placement.
07:42
Nerve-sparing Mid-urethral Obstruction (NeMO) in Female Small Rodents
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Cited by 7 •
2017
Traditional modeling of partial bladder outlet obstruction in rodents is fraught with animal mortality. A denervation injury from dissection around the proximal urethra and bladder neck is also of major concern. We developed and evaluated a safe and reliable mid-urethral obstruction model, avoiding the shortcomings of the traditional model.
11:37
Propeller Characterization: Variations in Pitch, Diameter, and Blade Number on Performance
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2023
Source: Shreyas Narsipur, Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC A propeller is a twisted airfoil, where the angle of the chord changes with respect to the location, along the radial station, as shown in Figure 1. Propellers are widely used in aircraft and watercraft propulsion systems thereby necessitating detailed characterizations of propellers to design high performance vehicles. Figure 1. Chord, thickness, and pitch at a radial station. One of...
01:17
Design Example: Calculating Safe Diameter for Wind-Exposed Disc
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2025
Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
08:24
Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
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Cited by 17 •
2018
The polysaccharide capsule is the primary virulence factor in Cryptococcus neoformans, and its size correlates with strain virulence. Capsule diameter measurements are used in phenotypic testing and to gauge therapeutic efficacy. Here a standard method of capsule induction is presented, and two methods of staining and measuring diameter are compared.
FAQs
A narrower lumen creates much greater resistance to urine passage, so even a modest reduction in caliber can lower flow and require higher bladder pressure. This relationship helps explain why structural narrowing may produce clinically important changes in urination and why urethral caliber is relevant when assessing possible obstruction or altered urinary function.
Urethral caliber depends on more than a fixed structural measurement. Smooth-muscle tone can alter the lumen, while tissue elasticity affects how readily the urethra maintains or changes its width. These factors can influence the relationship between a measured diameter and observed urinary function, making physiologic context important when interpreting urologic assessments.
A diameter measurement describes lumen size, but urinary function also reflects the resistance created by narrowing and the pressure needed to move urine. Combining caliber evaluation with functional tests and clinical examination can therefore provide a more meaningful assessment than relying on a size measurement alone, particularly when evaluating suspected obstruction.
Clinicians can evaluate urethral caliber through clinical examination, imaging, and functional testing, depending on the assessment being performed. These approaches help identify or monitor changes associated with urethral strictures and support interpretation of urinary function. The resulting information can contribute to treatment planning and safer decisions during urologic procedures.
Urethral caliber provides relevant information when selecting a catheter because the device must be compatible with the available lumen. Considering diameter can help clinicians plan instrumentation more appropriately and support procedural safety. Evaluation is especially important when narrowing is suspected, since altered caliber may affect how an intervention is planned and performed.
Repeated evaluation allows clinicians to follow changes in urethral caliber and relate them to urinary function over time. Monitoring can help assess whether narrowing persists or changes, support ongoing treatment planning, and provide information for later procedures. This longitudinal perspective is useful because stricture-related changes may influence both flow and procedural safety.