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Related Concept Videos

Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

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Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
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Acid-Base Balance01:25

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The human body maintains a narrow pH range regulated through acid-base balance. This balance is crucial as changes in the hydrogen ion concentration can disrupt cell membrane stability, alter protein structures, and change enzyme activities. The normal pH of arterial blood is 7.4, venous blood and interstitial fluid is 7.35, and intracellular fluid averages 7.0.
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pH Homeostasis01:31

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Acid-base homeostasis is essential for maintaining normal physiological activities in humans. The pH of various body fluids is strictly regulated because it is critical for the optimal activity of enzymes involved in metabolic reactions. Enzymes are basically proteins, so, any significant change in pH can affect their structure and activity. In humans, pH is regulated using three primary mechanisms— chemical buffer systems, respiratory regulation, and renal regulation.
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Disorders of Acid-Base Balance01:29

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The human body maintains a precise pH range of arterial blood between 7.35 and 7.45. Deviations result in either acidosis (pH < 7.35) or alkalosis (pH > 7.45). These conditions are further classified as respiratory or metabolic disorders based on their underlying cause.
Respiratory Acidosis and Alkalosis
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Acute Kidney Injury (AKI) requires a collaborative healthcare approach to restore renal function and prevent complications. Essential management strategies involve monitoring fluid and electrolyte balance, adjusting medications, initiating dialysis when necessary, and providing nutritional support.Fluid and Electrolyte ManagementFluid Monitoring: Regularly monitoring body weight, central venous pressure, and urine output helps detect fluid imbalances early. Patient intake and output are...
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Acute Kidney Injury (AKI) results in an inability to maintain fluid, electrolyte, and acid-base balance. Effective nursing management is critical in improving patient outcomes and includes comprehensive patient assessment and targeted interventions.Comprehensive Patient AssessmentA detailed history collection is essential, focusing on any recent infections, nephrotoxic medication use, or chronic conditions such as hypertension and diabetes that may contribute to AKI. During the physical...
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Related Experiment Video

Updated: Mar 19, 2026

Estimation of Nephron Number in Whole Kidney using the Acid Maceration Method
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[Kidney, Fluid, and Acid-Base Balance].

Naohiro Shioji, Masao Hayashi, Hiroshi Morimatsu

    Masui. the Japanese Journal of Anesthesiology
    |June 21, 2016
    PubMed
    Summary

    Kidneys are vital for homeostasis. Hydroxyl ethyl starch can cause kidney injury, while tolvaptan offers a cost-effective fluid management alternative. The Stewart approach aids in assessing acid-base balance in critical care.

    Area of Science:

    • Nephrology
    • Intensive Care Medicine
    • Critical Care

    Background:

    • The kidneys are crucial for maintaining human homeostasis, including fluid, electrolyte, and acid-base balance.
    • Physicians manage fluid balance using interventions like fluid resuscitation and diuretics.
    • Recent advancements focus on novel agents and assessment tools for critical care fluid and acid-base management.

    Purpose of the Study:

    • To review the complications of hydroxyl ethyl starch in fluid resuscitation and highlight kidney injury risks.
    • To discuss the role of tolvaptan as a cost-effective alternative for fluid management compared to carperitide.
    • To emphasize the utility of the Stewart approach in assessing acid-base balance, particularly metabolic components, in critically ill patients.

    Main Methods:

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  • Review of recent literature on fluid resuscitation agents, specifically hydroxyl ethyl starch.
  • Analysis of randomized trials comparing tolvaptan and carperitide for fluid control.
  • Discussion of the application and value of the Stewart approach in critical care acid-base assessment.

    • Main Results:

    • Hydroxyl ethyl starch, while effective for fluid resuscitation, is associated with frequent kidney injury requiring renal replacement therapy.
    • Tolvaptan demonstrates comparable fluid control effects to carperitide and presents a more cost-effective option.
    • The Stewart approach offers valuable insights into metabolic components of acid-base balance and kidney function in critically ill patients.

    Conclusions:

    • Careful consideration of fluid resuscitation agents like hydroxyl ethyl starch is necessary due to potential kidney complications.
    • Tolvaptan represents a promising and economical therapeutic option for fluid management in critical care.
    • The Stewart approach should be utilized for a better understanding and management of acid-base abnormalities in critically ill patients.