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Related Concept Videos

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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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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The glomerular filtration rate (GFR) is a critical indicator of kidney health, reflecting how well the kidneys filter blood. Changes in GFR can signal potential kidney impairment, necessitating accurate measurement methods to monitor kidney function effectively.Various molecules can serve as markers for GFR measurement, with the ideal marker meeting several specific criteria. It must freely filter at the glomerulus, avoid reabsorption or secretion by the renal tubules, remain unmetabolized, not...
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Serum Studies: Renal Function Tests01:24

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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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Renal Failure: Dose Adjustments01:11

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In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
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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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Can a structured questionnaire identify patients with reduced renal function?

Manal Azzouz1, Janne Rømsing, Henrik S Thomsen

  • 1Department of Diagnostic Radiology 54E2, Copenhagen University Hospital Herlev, Herlev Ringvej 75, DK-2730, Herlev, Denmark, manalazzouz@gmail.com.

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Summary

A questionnaire effectively identifies renal dysfunction in outpatients under 70 before imaging. For patients over 70, determining estimated glomerular filtration rate (eGFR) is crucial for safe contrast agent use.

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Area of Science:

  • Nephrology
  • Radiology
  • Internal Medicine

Background:

  • Renal dysfunction screening is vital before contrast-enhanced imaging.
  • Identifying at-risk patients minimizes contrast-induced nephropathy.
  • Current screening methods may not be universally efficient.

Purpose of the Study:

  • To assess a structured questionnaire's utility in detecting renal dysfunction in outpatients prior to MRI or CT scans.
  • To evaluate the questionnaire's effectiveness across different age demographics.

Main Methods:

  • A questionnaire identifying five key renal dysfunction risk factors (renal disease, surgery, hypertension, gout, diabetes) was administered.
  • Serum creatinine was measured using point-of-care (POC) testing.
  • Estimated glomerular filtration rate (eGFR) was calculated using the CKD-EPI equation.

Main Results:

  • 1,467 patients were analyzed; 8% had an eGFR <45 ml/min/1.73 m².
  • Among patients reporting risk factors, 13% had an eGFR <45 ml/min/1.73 m².
  • Among patients reporting no risk factors, 3% had an eGFR <45 ml/min/1.73 m², primarily in those >70 years old.

Conclusions:

  • The questionnaire accurately identifies renal dysfunction in patients under 70.
  • For patients over 70, direct eGFR determination is recommended before contrast-enhanced CT.
  • This approach optimizes patient safety and resource allocation in radiology departments.