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Urinary Bladder01:23

Urinary Bladder

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...
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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...
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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...
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The nursing assessment of the genitourinary (GU) system involves a systematic inspection and palpation to identify abnormalities in the kidneys, bladder, and surrounding structures.InspectionMouth: Inspect for signs of kidney dysfunction, such as stomatitis (inflammation of the mouth) and ammonia breath, which may occur in advanced kidney disease due to the buildup of urea, breaking down into ammonia.Skin: Check for pallor, which could indicate anemia caused by kidney disease. Look for...
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Bladder Smooth Muscle Strip Contractility as a Method to Evaluate Lower Urinary Tract Pharmacology
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Bladder tissue passive response to monotonic and cyclic loading.

Elisabetta M Zanetti1, Michela Perrini, Cristina Bignardi

  • 1Department of Industrial Engineering, University of Perugia, Italy.

Biorheology
|April 20, 2012
PubMed
Summary
This summary is machine-generated.

Understanding bladder tissue viscoelasticity is crucial for surgical repair and reconstruction. This study reveals that bladder mechanics are significantly affected by fiber orientation, strain rate, and loading history, influencing repair strategies.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Urology

Background:

  • Knowledge of passive mechanical properties is essential for designing effective surgical repair procedures and developing biomaterials for bladder reconstruction.
  • Understanding the viscoelastic behavior of bladder tissue is critical for addressing conditions requiring bladder augmentation or replacement.

Purpose of the Study:

  • To comprehensively analyze the viscoelastic behavior of bladder tissue.
  • To investigate the influence of fiber orientation, strain rate, and loading history on bladder tissue mechanics.
  • To provide data for the development of improved surgical repair techniques and biomaterials for bladder reconstruction.

Main Methods:

  • Whole bladders from pigs were dissected, and samples were isolated along apex-to-base and transverse directions.
  • Uniaxial monotonic (stress relaxation) and cyclic tests were conducted using a Bose Electroforce 3200 system.
  • Stress relaxation data were fitted using a second-order exponential series, and stress-strain curves were modeled non-linearly.

Main Results:

  • Bladder tissue's passive mechanical behavior is significantly influenced by frequency and loading history in both monotonic and cyclic tests.
  • Tissue anisotropy was observed in monotonic and cyclic tests, particularly in exercised tissue at high frequencies.
  • Transverse and apex-to-base samples exhibited similar relaxation behaviors.

Conclusions:

  • Bladder tissue exhibits complex viscoelastic properties dependent on loading conditions and structural orientation.
  • The findings highlight the importance of considering anisotropic and frequency-dependent behaviors for successful bladder repair and reconstruction.
  • This research provides foundational data for the design of advanced biomaterials and surgical strategies for bladder tissue engineering.