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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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In pediatric medicine, understanding the renal function and drug elimination nuances is crucial for administering safe and effective treatments. Newborns, in particular, display markedly slower renal functions than adults, profoundly affecting how drugs are cleared from their bodies. This slower drug clearance requires clinicians to extend the dosing intervals for many medications to prevent drug accumulation and toxicity while ensuring therapeutic efficacy.One key area where these adjustments...
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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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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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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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Early childhood fluoride exposure and preadolescent kidney function.

Charles Saylor1, Ashley J Malin2, Marcela Tamayo-Ortiz3

  • 1Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, USA.

Environmental Research
|September 10, 2021
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Childhood fluoride exposure did not impact kidney function in preadolescence. Further longitudinal studies are needed to understand potential long-term effects of early fluoride exposure on renal health.

Keywords:
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Area of Science:

  • Environmental Health
  • Pediatric Nephrology
  • Toxicology

Background:

  • Early-life renal maturation is vulnerable to environmental chemical exposure.
  • Widespread fluoride consumption and the global obesity epidemic necessitate understanding their combined health impacts.
  • Investigating the effects of childhood fluoride exposure on kidney function is crucial.

Purpose of the Study:

  • To determine if childhood fluoride exposure adversely affects kidney function in preadolescence.
  • To assess if adiposity status modifies the association between fluoride exposure and kidney function.
  • To evaluate the relationship between early urinary fluoride levels and preadolescent renal outcomes.

Main Methods:

  • The PROGRESS cohort study included 438 children.
  • Urinary fluoride (uF) was measured at age 4; kidney function (eGFR, BUN, proteins) and blood pressure were assessed at age 8-12.
  • Statistical models adjusted for body mass index (BMI), age, sex, and socioeconomic status.

Main Results:

  • Median urinary fluoride was 0.67 μg/mL; no significant associations were found between early uF and preadolescent eGFR.
  • A trend towards decreased eGFR was observed with higher uF, but it did not reach statistical significance (p=0.23).
  • No sex-specific effects or BMI modification were detected, though a trend suggested inverse association between uF and eGFR in children with obesity (p=0.08).

Conclusions:

  • Low-level early childhood fluoride exposure showed no association with preadolescent renal function.
  • The preadolescent age might be too early to detect adverse effects of chronic fluoride exposure.
  • Longitudinal follow-up is essential to fully understand the long-term renal impact of early-life fluoride exposure.