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Related Concept Videos

Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance01:25

Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance

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In healthy individuals, serum creatinine levels remain stable due to a balance between its constant production—primarily from muscle metabolism—and renal excretion. Creatinine is freely filtered by the glomeruli, making it a valuable marker for estimating renal function. When the glomerular filtration rate (GFR) decreases, the kidneys can only eliminate less creatinine, causing serum levels to rise.Serum creatinine concentration is widely used to estimate creatinine clearance...
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Factors Affecting Renal Clearance: Renal Impairment01:17

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Renal dysfunction significantly impairs the renal clearance of drugs, leading to potential complications in drug therapy. Renal failure, which can be caused by various factors, poses a significant challenge in the elimination of drugs from the body.
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration

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Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area.
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Acute Kidney Injury IV: Diagnostic Studies and Prevention01:30

Acute Kidney Injury IV: Diagnostic Studies and Prevention

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Accurate diagnosis and effective prevention are critical in managing Acute Kidney Injury (AKI), which is linked to high mortality rates ranging from 10% to 80%. Timely recognition of at-risk patients and careful monitoring can significantly reduce the likelihood of kidney damage.Diagnostic Assessments:The diagnostic process starts with a comprehensive medical history to identify prerenal, intrarenal, and postrenal causes.Prerenal causes, such as dehydration, hypotension, or blood loss, should...
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Serum Studies: Renal Function Tests01:24

Serum Studies: Renal Function Tests

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Renal function tests are crucial for assessing kidney health, monitoring disease progression, and evaluating the kidneys' efficiency in waste elimination, fluid balance, and electrolyte regulation. These tests offer critical insights into kidney function, even though routine measurements may appear normal until there is a significant decline in the glomerular filtration rate or GFR. Typically, signs of kidney impairment only become evident when the GFR falls to about 50% of its normal level.
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Acute Kidney Injury I: Introduction01:22

Acute Kidney Injury I: Introduction

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Introduction:Acute Kidney Injury (AKI) describes a swift decrease in kidney function occurring over hours to days, characterized by the kidneys' failure to remove waste products from the bloodstream. This leads to dangerous complications like metabolic acidosis, fluid overload, and electrolyte imbalances, such as hyperkalemia, which can cause life-threatening arrhythmias. AKI is common in both hospital and outpatient settings, often triggered by dehydration, sepsis, or exposure to nephrotoxic...
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[Effects of creatine supplementation on renal function].

Jorge Vega1, Juan Pablo Huidobro E1

  • 1Sección de Nefrología, Servicio de Medicina, Hospital Naval Almirante Nef, Viña del Mar, Chile.

Revista Medica De Chile
|December 21, 2019
PubMed
Summary

Creatine supplements can temporarily elevate creatinine levels, potentially mimicking kidney disease. Despite this, creatine is safe and does not cause kidney damage in healthy individuals.

Area of Science:

  • Biochemistry
  • Nephrology
  • Sports Nutrition

Background:

  • Creatine supplementation is common among athletes and fitness enthusiasts.
  • Elevated serum creatinine can be misinterpreted as indicative of kidney dysfunction.
  • Concurrent high protein intake can further complicate interpretation of renal markers.

Purpose of the Study:

  • To clarify the impact of creatine supplementation on renal function markers.
  • To differentiate between creatine-induced changes and actual kidney disease.
  • To inform clinical interpretation of laboratory results in individuals using creatine.

Main Methods:

  • Review of existing literature on creatine metabolism and renal markers.
  • Analysis of case reports and clinical studies.

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  • Comparison of laboratory values in creatine users versus non-users.

    • Main Results:

    • Creatine supplementation can transiently increase serum creatinine levels.
    • This elevation may lead to a false diagnosis of chronic renal failure.
    • Blood urea nitrogen may also be affected, particularly with high protein diets.
    • No significant evidence of kidney damage directly caused by creatine in healthy individuals.

    Conclusions:

    • Creatine supplements are generally safe for renal health in the absence of pre-existing conditions.
    • Clinicians should be aware of creatine's effect on creatinine levels to avoid misdiagnosis.
    • Individuals with chronic renal disease or on nephrotoxic medications should avoid creatine supplements.