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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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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

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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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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.
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In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
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Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
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In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess...
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Plasma Creatinine Level Does Not Predict Respiratory Function in Amyotrophic Lateral Sclerosis.

João Morgadinho1, Ana Catarina Pronto-Laborinho1, Vasco A Conceição1

  • 1Instituto de Fisiologia, Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal.

Journal of Neuromuscular Diseases
|March 1, 2021
PubMed
Summary

In amyotrophic lateral sclerosis (ALS), lower plasma creatinine levels are linked to faster disease progression but not respiratory decline. This study found no predictive value of creatinine for respiratory function or survival in ALS patients.

Keywords:
Amyotrophic lateral sclerosiscreatinineprogressionrespiratory functionsurvival

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Area of Science:

  • Neurology
  • Biochemistry

Background:

  • Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease affecting motor neurons.
  • Lower plasma creatinine levels have been previously associated with poorer survival and faster functional decline in ALS patients.
  • The relationship between plasma creatinine and respiratory outcomes in ALS remains unclear.

Discussion:

  • This retrospective study analyzed 233 unselected ALS patients to investigate the association between plasma creatinine and respiratory function.
  • Multiple-regression and Cox-regression analyses were employed to assess the predictive value of creatinine.
  • The study found that while baseline creatinine levels correlated with the ALSFRS-R score, they did not predict its decline rate.

Key Insights:

  • Plasma creatinine levels were not found to be a significant predictor of forced vital capacity (FVC) or its decline rate in ALS patients.
  • Creatinine levels did not demonstrate predictive value for survival in the studied ALS cohort.
  • The findings suggest that plasma creatinine may not serve as a reliable biomarker for respiratory outcomes in amyotrophic lateral sclerosis.

Outlook:

  • Further research is warranted to explore other potential biomarkers for respiratory function in ALS.
  • Investigating the underlying mechanisms linking creatinine metabolism and neurodegeneration in ALS could provide new therapeutic targets.
  • Longitudinal studies with larger, diverse ALS populations may offer deeper insights into the role of metabolic factors in disease progression.