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Related Concept Videos

Ascites01:19

Ascites

DefinitionAscites is the buildup of fluid inside the peritoneal cavity. It occurs when fluid moves out of the vascular system faster than the peritoneal lymphatics can remove it. This fluid shift is most commonly seen in liver cirrhosis but can also appear in several other systemic disorders.EtiologyCirrhosis remains the leading cause of ascites. Other conditions that can contribute include:Heart failureConstrictive pericarditisAbdominal cancersNephrotic syndromeSevere protein–calorie...
Pleural Effusion I: Introduction01:25

Pleural Effusion I: Introduction

Pleural effusion is an abnormal fluid accumulation in the pleural cavity, a narrow space between the lungs and the chest wall. It is not a disease per se but rather a symptom or indication of an underlying disease. In normal circumstances, this space contains a small amount of fluid (5 to 15 mL), a lubricant facilitating the non-frictional movement of the pleural surfaces.
There are two main types of pleural effusion: transudative and exudative. They are differentiated using Light's criteria,...
Disorder of Water Balance01:29

Disorder of Water Balance

Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
Heart Failure Drugs: Diuretics01:22

Heart Failure Drugs: Diuretics

Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
Pulmonary Edema II: Pathophysiology01:18

Pulmonary Edema II: Pathophysiology

Pulmonary edema is the accumulation of fluid in the interstitial and alveolar spaces of the lungs, impairing gas exchange and oxygen delivery. It may be cardiogenic or noncardiogenic, but both reduce oxygenation and lung compliance.Cardiogenic Pulmonary EdemaCardiogenic edema results from increased hydrostatic pressure in pulmonary capillaries, usually due to left ventricular dysfunction from myocardial infarction, heart failure, or valvular disease. Ineffective cardiac pumping causes blood to...
Hemodialysis II: Procedure and Complications01:24

Hemodialysis II: Procedure and Complications

DialyzersA hemodialysis (HD) dialyzer is a plastic cartridge containing thousands of parallel hollow fibers, which serve as semipermeable membranes. These fibers are typically made from cellulose-based or other synthetic materials. During HD, blood is pumped into the top of the cartridge and distributed among these fibers. Simultaneously, dialysis fluid, known as dialysate, is introduced into the bottom of the cartridge, bathing the outside of the fibers. Across the semipermeable membrane,...

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Updated: Jun 13, 2026

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
07:17

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis

Published on: August 17, 2022

Oliguria and fluid overload.

Thomas Rimmelé, John A Kellum

    Contributions to Nephrology
    |April 30, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Oliguria, a common clinical sign, can indicate serious kidney issues or dehydration. In acute kidney injury patients, oliguria and fluid overload worsen outcomes, leading to complications like heart failure.

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    Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

    Published on: June 21, 2024

    Area of Science:

    • Nephrology
    • Critical Care Medicine

    Background:

    • Oliguria is a frequent clinical presentation with ambiguous origins, potentially signaling disease or a physiological response to reduced renal perfusion.
    • In acute kidney injury (AKI), oliguria is a significant independent predictor of mortality.
    • Fluid overload frequently accompanies oliguric AKI due to impaired renal sodium and water excretion.

    Purpose of the Study:

    • To review the detrimental effects of oliguria and associated fluid overload in patients.
    • To emphasize the underlying pathophysiology linking oliguria and fluid overload.
    • To highlight the clinical significance of interpreting oliguria accurately.

    Main Methods:

    • Literature review focusing on pathophysiology and clinical outcomes.
    • Synthesis of existing research on oliguria and fluid overload in AKI.
    • Analysis of clinical consequences of fluid overload in oliguric AKI.

    Main Results:

    • Oliguria can be challenging to interpret, necessitating careful clinical evaluation.
    • Fluid overload in oliguric AKI leads to severe cardiopulmonary complications, including heart failure and pulmonary edema.
    • Additional complications of fluid overload include delayed wound healing, tissue breakdown, and gastrointestinal dysfunction.

    Conclusions:

    • Oliguria and fluid overload are interconnected clinical problems with significant morbidity and mortality.
    • Understanding the pathophysiology is crucial for managing these conditions effectively.
    • Prompt recognition and management of oliguria and fluid balance are essential in AKI patients.