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Iohexol

Iohexol, a low-osmolar non-ionic iodinated contrast agent, is being extensively studied in various clinical trials for its applications in medical imaging and kidney function assessment. This article explores the diverse uses of Iohexol in ongoing research, focusing on its role in computed tomography colonography, glomerular filtration rate measurement, and renal function evaluation in different patient populations.

Table of Contents

What is Iohexol?

Iohexol, also known by its brand name Omnipaque, is a medical contrast agent used in various diagnostic imaging procedures[1]. It is a non-ionic, low osmolar, X-ray contrast medium that is considered safe and non-toxic[2]. Iohexol is primarily used to enhance the visibility of internal body structures during imaging tests, making it easier for doctors to diagnose and monitor various conditions.

Uses of Iohexol

Iohexol has several important medical applications:

  • Measuring Kidney Function: Iohexol is widely used to measure glomerular filtration rate (GFR), which is an indicator of how well your kidneys are functioning. This is particularly useful in patients with kidney problems or those at risk of kidney disease[1][2].
  • Coronary Angiography: Iohexol is used during coronary angiography, a procedure that allows doctors to see the blood vessels in your heart. This helps in diagnosing and treating heart conditions[3].
  • CT Colonography: Also known as virtual colonoscopy, this procedure uses iohexol to enhance the visibility of the colon and rectum, helping doctors detect abnormalities like polyps or cancer[4].
  • Other Imaging Procedures: Iohexol is used in various other imaging tests, including CT scans of the abdomen and pelvis[4].

How Iohexol Works

Iohexol works by temporarily changing how X-rays interact with the body. When injected into the bloodstream or given orally, it flows through the body and makes certain areas appear brighter or more visible on X-ray images. This enhanced visibility helps doctors see details that might otherwise be difficult to detect[3].

In kidney function tests, iohexol is used because it is eliminated from the body exclusively through the kidneys. By measuring how quickly the body clears iohexol, doctors can accurately assess kidney function[2].

Administration

Iohexol can be administered in different ways depending on the specific medical procedure:

  • Intravenous Injection: For procedures like coronary angiography or kidney function tests, iohexol is typically injected into a vein[3][5].
  • Oral Administration: For procedures like CT colonography, iohexol may be given by mouth[4].

The dosage and method of administration will be determined by your healthcare provider based on the specific procedure and your individual needs.

Safety and Side Effects

Iohexol is generally considered safe and well-tolerated by most patients. It has a better safety profile compared to older, high-osmolar contrast agents[3]. However, like all medications, it can cause side effects in some people. These may include:

  • Nausea
  • Headache
  • Feeling of warmth or flushing
  • Allergic reactions (rare)

Your healthcare provider will discuss potential risks and side effects with you before the procedure.

Special Considerations

While iohexol is generally safe, there are some special considerations:

  • Kidney Function: If you have kidney problems, your doctor will carefully consider the use of iohexol, as it is eliminated through the kidneys[1].
  • Allergies: If you have a history of allergies, especially to contrast agents, inform your doctor before receiving iohexol.
  • Pregnancy and Breastfeeding: The safety of iohexol during pregnancy and breastfeeding has not been fully established. Discuss this with your doctor if applicable.

Ongoing Research

Iohexol continues to be the subject of ongoing research to improve its use and explore new applications:

  • Kidney Function in Critical Care: Studies are investigating the use of iohexol to measure kidney function in critically ill patients, which could help in managing medications and preventing kidney damage[1][6].
  • Improved Formulations: Researchers are exploring new formulations of iohexol, such as Captisol-Enabled Iohexol, which may have improved safety profiles, especially for patients with impaired kidney function[3].
  • Use in HIV Patients: Studies are examining how iohexol can be used to assess kidney function in HIV patients, who may be at higher risk of kidney problems due to their condition and medications[7].

These ongoing studies aim to expand our understanding of iohexol and improve its use in various medical contexts.

Aspect Description
Primary Uses Medical imaging (CT colonography), Measuring glomerular filtration rate (GFR)
Patient Populations Critically ill patients, HIV-infected individuals, Patients with renal impairment, Colorectal cancer screening candidates
Advantages Low osmolality, Better safety profile than high-osmolar agents, Accurate GFR measurement
Clinical Trial Focus Renal function assessment, Drug pharmacology in older HIV patients, Contrast-induced nephropathy prevention
Administration Methods Intravenous injection, Oral ingestion (for CT colonography)
Key Outcomes Measured GFR, Incidence of contrast-induced acute kidney injury, Image quality in CT colonography

FAQ

  • What is Iohexol and how is it used in clinical trials? Iohexol is a low-osmolar non-ionic iodinated contrast agent used in various medical imaging procedures and kidney function tests. In clinical trials, it is being studied for its applications in computed tomography colonography, measurement of glomerular filtration rate, and evaluation of renal function in different patient populations.
  • How is Iohexol used in computed tomography colonography? In computed tomography colonography (CTC), Iohexol is used as an oral contrast agent to tag residual stool and fluid in the colon. This tagging helps improve the accuracy of CTC in detecting colorectal polyps and masses, making it a potential alternative to traditional colonoscopy for colorectal cancer screening.
  • What are the advantages of using Iohexol for measuring kidney function? Iohexol is used to measure glomerular filtration rate (GFR), which is an indicator of kidney function. It offers advantages over traditional methods because it is not affected by factors like muscle mass, age, or gender. Iohexol clearance provides a more accurate measurement of GFR, especially in patients with unstable renal function or those undergoing treatments that may affect kidney function.
  • Are there any safety concerns with using Iohexol? Iohexol is generally considered safe and well-tolerated. It has a better safety profile compared to high-osmolar contrast agents, making it suitable for use in various patient populations, including those who are frail or have multiple comorbidities. However, as with any medical procedure, there may be some risks, and patients should discuss any concerns with their healthcare provider.
  • How is Iohexol being studied in HIV-infected individuals? Clinical trials are investigating the use of Iohexol to measure GFR in HIV-infected individuals, particularly in older patients. These studies aim to understand how age affects kidney function and drug pharmacology in HIV-infected adults, which is crucial for optimizing antiretroviral therapy and managing potential drug-related toxicities in this population.

Ongoing Clinical Trials on Iohexol

  • A study to compare the effects of BI 690517 and spironolactone on kidney function in patients with heart failure, cardiovascular disease, or chronic kidney disease

    Recruiting

    2 1 1 1
    Investigated diseases:
    Investigated drugs:
    The Netherlands

  • Obinutuzumab treatment for adults with frequently relapsing idiopathic nephrotic syndrome who are dependent on rituximab

    Recruiting

    2 1 1 1
    Investigated diseases:
    Investigated drugs:
    Italy

  • Evaluating Morphine Effectiveness Based on Kidney Function in Patients with Sickle Cell Disease During Vaso-occlusive Crisis

    Recruiting

    3 1 1 1
    Investigated diseases:
    Investigated drugs:
    France

  • Study Comparing Intravenous Contrast CT with Non-Contrast CT for Patients with Acute Abdominal Pain and Reduced Kidney Function Using Iohexol

    Recruiting

    3 1 1 1
    Investigated diseases:
    Investigated drugs:
    Finland Norway

  • Study on Eplerenone for Improving Kidney Function in Patients Undergoing Kidney Transplantation

    Recruiting

    3 1 1
    Investigated diseases:
    Investigated drugs:
    France

  • Study to Compare Non-Radioactive Methods for Measuring Kidney Function in Patients with Chronic Kidney Disease Using Sodium Iotalamate, Sodium Iodohippurate, and Iohexol

    Recruiting

    3 1 1 1
    Investigated diseases:
    Investigated drugs:
    The Netherlands

  • Study on Reducing Tacrolimus in Kidney Transplant Patients with Low Immunological Risk Using Tacrolimus, Mycophenolic Acid, and Prednisone

    Recruiting

    3 1 1 1
    Investigated diseases:
    Investigated drugs:
    France Norway Spain

  • Study on Preventing Kidney Problems in Peripheral Arterial Disease Patients Using Carbon Dioxide and Iopamidol, Iomeprol, and Iopromide During Vascular Procedures

    Recruiting

    3 1 1 1
    Investigated diseases:
    Investigated drugs:
    Austria Germany

  • Study of Carbon Dioxide versus Iodine Contrast in Patients with Abdominal Aortic Aneurysm Having Fenestrated Endovascular Repair

    Not yet recruiting

    3 1 1 1
    Investigated diseases:
    Investigated drugs:
    Sweden

  • Study on Detecting and Classifying Breast Disease Using Iodixanol in Digital Mammography and Tomosynthesis Compared to MRI in Patients with Breast Pathology

    Not yet recruiting

    2 1 1 1
    Investigated drugs:
    Italy

Glossary

  • Iohexol: A low-osmolar non-ionic iodinated contrast agent used in medical imaging procedures and for measuring kidney function.
  • Glomerular Filtration Rate (GFR): A measure of how well the kidneys are filtering waste from the blood, used to assess kidney function.
  • Computed Tomography Colonography (CTC): A medical imaging procedure that uses CT scans to produce detailed images of the colon and rectum, used for colorectal cancer screening.
  • Contrast-induced Acute Kidney Injury (CI-AKI): A sudden deterioration in kidney function that occurs within 48-72 hours of administering iodinated contrast media.
  • Creatinine: A waste product produced by muscle metabolism that is filtered by the kidneys and used as a marker of kidney function.
  • Cystatin C: A protein produced by all nucleated cells in the body, used as an alternative marker for estimating GFR.
  • Antiretroviral Therapy: Treatment for HIV infection using a combination of medications to suppress the virus and slow the progression of the disease.
  • Augmented Renal Clearance: An increased rate of elimination of drugs or other substances by the kidneys, often observed in critically ill patients.
  • Biomarkers: Measurable indicators of biological processes, used to assess normal or pathogenic processes or responses to therapeutic interventions.
  • Pharmacokinetics: The study of how drugs are absorbed, distributed, metabolized, and eliminated by the body.

References

  1. https://clinicaltrials.gov/study/NCT02961478
  2. https://clinicaltrials.gov/study/NCT01545531
  3. https://clinicaltrials.gov/study/NCT04627831
  4. https://clinicaltrials.gov/study/NCT04582500
  5. https://clinicaltrials.gov/study/NCT02050269
  6. https://clinicaltrials.gov/study/NCT04776486
  7. https://clinicaltrials.gov/study/NCT02522338