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Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
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Glomerular Filtration: Net Filtration Pressure01:26

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Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP).
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Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

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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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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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Renal Drug Excretion: Glomerular Filtration01:02

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The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, starts with glomerular filtration and results in urine formation. Each kidney houses millions of functional units called nephrons, where urine production occurs. A nephron has two main components: a renal corpuscle and a renal tubule.
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Circulating antithyroid antibodies contribute to the decrease of glomerular filtration rate in lithium-treated

Alberto Bocchetta1,2, Luca Ambrosiani3, Gioia Baggiani3

  • 1Section of Neuroscience and Clinical Pharmacology, Department of Biomedical Sciences, University of Cagliari, Via Ospedale 54, 09124, Cagliari, Italy. bocchett@unica.it.

International Journal of Bipolar Disorders
|March 2, 2018
PubMed
Summary
This summary is machine-generated.

Long-term lithium treatment may impact kidney function. This study found circulating thyroid antibodies are linked to a significant decline in estimated glomerular filtration rate (eGFR) in patients on lithium therapy.

Keywords:
Anti-thyroglobulinChronicGlomerular filtration rateLithiumRenal insufficiencyThyroid microsomal antibodies

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Area of Science:

  • Nephrology
  • Endocrinology
  • Psychiatry

Background:

  • Long-term lithium therapy is associated with potential adverse effects on renal function.
  • Chronic kidney disease (CKD) is a concern in patients undergoing prolonged lithium treatment.
  • Comorbidities may influence the development of CKD in lithium-treated individuals.

Purpose of the Study:

  • To investigate comorbidities associated with chronic kidney disease in patients receiving long-term lithium treatment.
  • To analyze the impact of specific comorbidities on renal function decline in a lithium-treated cohort.
  • To identify factors contributing to reduced estimated glomerular filtration rate (eGFR) in patients on lithium therapy.

Main Methods:

  • A cohort of 394 patients treated with lithium for ≥5 years was studied.
  • Comorbidities including diabetes, antihypertensive medication, L-thyroxine treatment, and thyroid antibodies were analyzed.
  • Multivariate regression and Cox survival analyses were applied to assess the influence of sex, age, lithium duration, and comorbidities on eGFR categories.

Main Results:

  • Advancing age was significantly associated with a decline in eGFR to <60 mL/min/1.73 m².
  • The presence of circulating thyroid antibodies was linked to a decline in eGFR to <45 mL/min/1.73 m².
  • Kaplan-Meier curves illustrated the time to eGFR decline in patients with and without thyroid antibodies.

Conclusions:

  • This study suggests a potential role for circulating thyroid antibodies in severe eGFR decline among lithium-treated patients.
  • Thyroid autoimmunity may be a significant factor contributing to lithium-induced nephrotoxicity.
  • Further research is warranted to elucidate the mechanisms underlying this association and inform clinical management.