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Disorders of the Urinary System01:20

Disorders of the Urinary System

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The urinary system is responsible for eliminating waste and excess fluids from the body. However, disorders of the urinary system can arise due to various reasons like infections, stress, age, congenital abnormalities, and lifestyle.
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Urinary Tract Infection I: Introduction01:26

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Urinary tract infections (UTIs) impact various parts of the urinary system, including the kidneys, ureters, bladder, and urethra. These infections are generally bacterial, with Escherichia coli being the most common causative agent, often originating from the gastrointestinal tract. However, other bacteria, such as Staphylococcus saprophyticus, Klebsiella pneumoniae, and Proteus mirabilis, are also known to cause UTIs. The type, location, and underlying complexity of the UTI guide both...
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Urinary Tract Infection II: Pathophysiology01:25

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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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...
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Nursing Assessment of the Genitourinary System I: Health History01:21

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The genitourinary system is critical to maintaining fluid balance, waste elimination, and reproductive function. Nurses play a vital role in assessing this system, beginning with a thorough health history. This process involves gathering patient information, identifying risk factors, and recognizing symptoms of genitourinary disorders. Early detection is vital for timely interventions and management.1. Gathering Patient InformationA complete health history includes the patient’s personal,...
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Urine formation is an essential function of the human body. It plays a critical role in maintaining homeostasis by regulating the volume and composition of body fluids. The kidneys, the primary organs involved in this process, filter blood to remove waste products and excess substances, ultimately producing urine.
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Detrusor Underactivity Model in Rats by Conus Medullaris Transection
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How brain diseases affect the lower urinary tract function?

Ryuji Sakakibara1, Tatsuya Yamamoto2, Noritoshi Sekido3

  • 1Neurology, Sakura Medical Center, Toho University, Sakura, Japan.

Bladder (San Francisco, Calif.)
|April 3, 2023
PubMed
Summary
This summary is machine-generated.

The brain controls lower urinary tract (LUT) function, with unique sensory pathways to the insular cortex and motor pathways to the precentral cortex. Brain diseases can disrupt this control, causing detrusor overactivity.

Keywords:
bladderbrainfunctional neuroimagingoveractive bladderstroke

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Area of Science:

  • Neuroscience
  • Urology

Background:

  • The lower urinary tract (LUT) exhibits unique afferent and efferent pathophysiology within the autonomic nervous system.
  • Bladder sensation occurs during both storage and voiding phases, with neural signals reaching specific brain regions.
  • Detrusor overactivity, an exaggerated micturition reflex, is linked to various brain diseases.

Purpose of the Study:

  • To review the brain mechanisms governing lower urinary tract (LUT) function.
  • To elucidate the neural pathways involved in LUT sensation and control.
  • To understand how brain diseases impact LUT function and lead to detrusor overactivity.

Main Methods:

  • Review of existing literature on LUT neurophysiology.
  • Analysis of experimental animal studies using single neuron firing.
  • Examination of human studies employing evoked potentials and functional neuroimaging.

Main Results:

  • Sphincter information ascends to the precentral motor cortex; bladder information projects to the insular cortex (IC)/anterior cingulate (ACG) and prefrontal cortex (PFC).
  • A bladder-inhibitory pathway (PFC-IC/ACG-hypothalamus-PAG) regulates micturition, involving dopaminergic and cerebellar connections.
  • Damage to these brain areas in conditions like stroke or dementia with Lewy bodies can impair inhibition, causing detrusor overactivity.

Conclusions:

  • The brain plays a critical role in regulating LUT function through complex neural pathways.
  • Dysfunction in these central pathways due to neurological diseases significantly impacts bladder control.
  • Understanding these brain mechanisms is crucial for managing detrusor overactivity in affected patients.