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O15-Water

This article discusses a clinical trial investigating the relationship between obesity, circadian rhythms, and cardiovascular health. The study uses various techniques, including PET imaging with O15-Water, to examine how body weight and sleep patterns may affect heart health. This research aims to provide insights that could lead to more effective treatments for cardiovascular risks in obese individuals.

Table of Contents

What is O15-Water?

O15-Water is a special type of water used in medical imaging. The “O15” refers to oxygen-15, which is a radioactive form of oxygen. This radioactive water is used as a radiopharmaceutical, which means it’s a substance that contains a radioactive isotope used for diagnosing and treating diseases[1].

How is O15-Water Used?

O15-Water is used during a special type of imaging called Positron Emission Tomography (PET). PET scans help doctors see how organs and tissues are functioning in the body. When O15-Water is injected into the body, it travels through the bloodstream, allowing doctors to measure blood flow in different parts of the body[1].

Purpose of O15-Water in Research

In the clinical trial described, O15-Water is being used to study blood flow in the heart. Specifically, researchers are using it to measure coronary blood flow, which is the blood flow in the arteries that supply the heart muscle with oxygen and nutrients[1].

The researchers are particularly interested in how this blood flow might be different in people with obesity compared to those without obesity, and how it might change at different times of the day. This is part of a larger study looking at how obesity and our body’s daily (circadian) rhythms might affect heart health[1].

Safety and Administration

O15-Water is given to patients through an injection into a vein. It’s important to note that while it does contain a radioactive substance, the radiation exposure is generally considered low and the substance decays quickly in the body[1].

However, as with any medical procedure involving radiation, it’s used carefully and only when the benefits of the information gained outweigh any potential risks. The procedure is performed by trained medical professionals in a controlled hospital or research setting[1].

The study using O15-Water is part of a larger research project investigating several health conditions and factors:

  • Cardiovascular Risk Factors: These are conditions or habits that increase a person’s risk of developing heart disease. The study is looking at how these risk factors might change throughout the day[1].
  • Circadian Dysregulation: This refers to problems with the body’s natural daily rhythms. The researchers are studying how these rhythms might affect heart health[1].
  • Obesity: The study is comparing people with obesity to those without, to see how obesity might affect heart function and blood flow[1].

By using O15-Water and other advanced imaging techniques, researchers hope to better understand how these factors interact and potentially contribute to heart disease risk. This could lead to improved treatments and prevention strategies in the future[1].

Aspect Details
Study Title Body Weight, Sleep, and Heart Health
Main Focus Circadian mechanisms of cardiovascular risk in obesity
Participant Groups Healthy lean controls and healthy obese individuals
Key Measurements Blood pressure, heart rate, stress hormones, inflammation markers, coronary blood flow
Imaging Techniques PET imaging with O15-Water, echocardiography, CT scan
Duration 5-day circadian study protocol
Potential Impact Improved timing of cardiovascular medications for obese individuals

FAQ

  • What is the main purpose of this clinical trial? The main purpose is to investigate how obesity affects cardiovascular risk factors and circadian rhythms. The study aims to understand if cardiovascular rhythms make obese individuals more susceptible to heart disease, especially during morning hours.
  • How is O15-Water used in this study? O15-Water is used as a radioactive tracer during PET imaging to measure coronary blood flow. This helps researchers understand how blood flows through the heart in both lean and obese participants.
  • Who are the participants in this study? The study includes two groups: healthy lean individuals (with a BMI between 18.5 and 25) and healthy obese individuals (with a BMI between 30 and 40). Both groups participate in a 5-day circadian study protocol.
  • What other measurements are taken during the study? The study measures various factors including blood pressure, heart rate, stress hormones, inflammation markers, body composition, and coronary artery calcium. It also examines heart function using techniques like echocardiography and PET imaging.
  • How might the results of this study be used? The results could serve as a foundation for future clinical trials, potentially leading to better-timed medication dosing for cardiovascular issues in obese individuals. This could increase the effectiveness of treatments while reducing side effects.

Ongoing Clinical Trials on O15-Water

  • Study on Water Absorption in the Brain for Adults with Hydrocephalus Using O15-Water

    Recruiting

    1 1 1
    Investigated diseases:
    Investigated drugs:
    Norway

  • Study on O15-Water for Diagnosing Coronary Artery Disease in Patients Using PET Imaging During Stress and Rest Conditions

    Recruiting

    1 1 1
    Investigated drugs:
    Denmark Germany The Netherlands Sweden

  • Study on the Effects of AZD3427 on Kidney Function in Heart Failure Patients with Kidney Issues

    Not recruiting

    1 1
    Investigated diseases:
    Investigated drugs:
    Sweden

Glossary

  • Circadian rhythm: The natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.
  • PET imaging: Positron Emission Tomography, a type of medical imaging that uses small amounts of radioactive materials to diagnose or treat various conditions.
  • O15-Water: A radioactive tracer used in PET imaging to measure blood flow, particularly in the heart.
  • BMI: Body Mass Index, a measure that uses your height and weight to work out if your weight is healthy.
  • Cardiovascular: Relating to the heart and blood vessels.
  • Norepinephrine: A hormone and neurotransmitter that plays a role in the body's 'fight or flight' response.
  • Beta-adrenergic receptor: A type of protein on cells that responds to certain hormones and neurotransmitters, affecting heart rate and other functions.
  • Endothelial function: The health of the inner lining of blood vessels, important for proper blood flow.
  • Coronary: Relating to the arteries that supply blood to the heart muscle.
  • Microvascular: Referring to small blood vessels in the body.

References

  1. https://clinicaltrials.gov/study/NCT03388788