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Related Concept Videos

Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

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...
Renal Failure: Dose Adjustments01:11

Renal Failure: Dose Adjustments

In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
Reduced renal clearance and elimination rate are common outcomes of renal impairment. These alterations lead to a prolonged elimination half-life and an altered apparent volume of distribution for drugs. As a result, dosage adjustments are typically necessary to maintain optimal drug levels in the body.
However, dosage adjustments...
Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate

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...
Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

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...
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

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. This equation is...

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Related Experiment Video

Updated: Jun 23, 2026

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Coronary flow slows as renal function worsens.

Mehmet Birhan Yilmaz1, Kenan Yalta

  • 1Department of Cardiology, Cumhuriyet University School of Medicine, Sivas, Turkey.

Clinical Cardiology
|May 20, 2009
PubMed
Summary

Impaired renal function is linked to slower coronary blood flow in individuals without obstructive coronary artery disease. This study found an independent association between reduced kidney function and coronary flow, measured by Thrombolysis In Myocardial Infarction (TIMI) frame counts.

Related Experiment Videos

Last Updated: Jun 23, 2026

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Area of Science:

  • Cardiology
  • Nephrology
  • Diagnostic Imaging

Background:

  • Slow coronary flow (SCF) is an angiographic finding in patients without obstructive coronary artery disease, detectable by Thrombolysis In Myocardial Infarction (TIMI) frame counts.
  • Impaired renal function (IRF) is a common clinical problem.
  • The relationship between SCF and IRF requires further investigation.

Purpose of the Study:

  • To evaluate the impact of impaired renal function on slow coronary flow in patients with normal coronary arteries.
  • To determine if there is an independent association between renal function and coronary flow.

Main Methods:

  • 105 patients with impaired renal function (calculated glomerular filtration rate [GFR] < 90 mL/min/1.73 m²) and normal coronary arteries were enrolled.
  • 102 age- and sex-matched controls with normal GFR were used for comparison.
  • Thrombolysis In Myocardial Infarction (TIMI) frame counts were used to assess coronary flow.

Main Results:

  • A significant negative correlation was observed between calculated GFR and TIMI frame counts in the left anterior descending (LAD), circumflex (CX), and right coronary artery (RCA) in patients with IRF.
  • Multiple regression analysis, after adjusting for blood pressure and HDL cholesterol, confirmed an independent relationship between TIMI frame count and GFR.
  • These findings suggest that lower GFR is associated with slower coronary flow.

Conclusions:

  • Impaired renal function is associated with slower coronary flow in patients with normal coronary arteries.
  • An independent association exists between GFR and TIMI frame count in individuals with impaired renal function.
  • These results highlight a potential link between kidney health and coronary circulation.