- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02672722
Assessment of the Changes in Cortical and Medullary Renal Blood Flow During Exercise in Healthy Subjects Using Contrast Enhanced Ultrasound
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
This study requires a screening day and two visits on separate days to the Clinical Research Unit (CRU). Three visits total.
Screening Visit:
- The subjects will undergo detailed history and physical examination.
- The inclusion and exclusion criteria will be reviewed.
- The details of the study procedures, potential risks and benefits will be reviewed with each subject and all potential questions will be answered.
- Subjects' understating of all details of the study components will be ascertained and they will be asked to sign the informed consent form.
- A copy of the signed informed consent will be placed in study file and another copy will be provided to each subject.
- The study visit day will be scheduled within 2 weeks of the screening day.
- All subjects will be asked to arrive on their first study day after an overnight fast. They will be instructed to avoid caffeine and exercise for 24 hours.
Study Day #1 The subjects will arrive in the CRU in the morning. Subjects' understanding of all study related procedures will be assessed and all remaining questions will be answered. The following sequence of procedures will be followed for all enrolled subjects.
- Physical exam including vital signs (Blood Pressure, Heart Rate, Weight, Height, Respiration Rate, Temperature)
Urine pregnancy test for women of child bearing age. If positive, subjects will be excluded.
Determination of peak oxygen consumption
Subjects will complete a continuous VO2 peak bicycle ergometer protocol.
- Each subject will start peddling on a stationary bike
- The initial power output (PO) will be set at 20 watts
- The power output will be increased by 15 watts every 2-minutes until volitional exhaustion.
- Metabolic data will be collected during the protocol using standard open-circuit spirometric techniques (Viasys Vmax Encore, Yorba Linda, CA)
- Heart rate was assessed electrocardiographically.
- VO2 peak will be chosen as the highest VO2 attained during the exercise protocol
On Day 2 of testing
- Check Vitals (BP, HR, Wt., RR, Temp.)
- Insert peripheral IV line Baseline renal blood flow measurement using contrast enhanced ultrasonography
- The Definity vial will be placed at room temperature before being used. It will be activated after shaking the vial using Vialmax® for 45 seconds. It will be used immediately after activation.
- 0.4 ml of Definity will be mixed in 10 ml of preservative free saline.
- Infusion of Definity into a peripheral vein will be started at 2 ml/min and titrated for optimal image quality using a minipump (not to exceed 10 ml/min at any time).
- Baseline contrast ultrasound imaging of right kidney will be performed with low mechanical index (MI) of 0.2.
- 4 - 5 ultrasound impulses with high MI of 1.0 and duration of 1 second will be used to destruct the microbubbles in the kidney tissue
- Ultrasound imaging of the kidney with low MI (0.2) will continue immediately after each impulse for several seconds.
- Infusion of Definity will stop at this point.
- Vital signs will be monitored every 15 minutes and continuous pulse oximetry will be performed during Definity administration.
- Vital signs and pulse oximetry will be monitored every 15 minutes until 30 minutes after discontinuation of Definity.
A urine dipstick will be performed by the study team 30 minutes after completion of Definity infusion if a sample is available.
Constant load Exercise protocol
- Subjects will complete 30 minutes of continuous cycling at the power output associated with 85% of VO2peak from the continuous bicycle ergometer protocol. Metabolic data will be collected as described above.
- Once metabolic parameter are reached, exercise will be stopped and subject will be asked to lie down on the bed Renal Blood flow measurement following exercise using contrast enhanced ultrasonography
- Immediately after completion of exercise protocol, steps 5 - 12 under day 2 procedures will be repeated.
- The study procedures will end at this point.
Study Type
Enrollment (Anticipated)
Phase
- Phase 2
- Phase 1
Contacts and Locations
Study Contact
- Name: Sharon F Johnson, BA
- Phone Number: 4349823198
- Email: sfj8n@virginia.edu
Study Contact Backup
- Name: Kambiz Kalantarinia, MD
- Phone Number: 434982-3198
- Email: KK6C@hscmail.mcc.virginia.edu
Study Locations
-
-
Virginia
-
Charlottesville, Virginia, United States, 22908
- Recruiting
- University of Virginia
-
Contact:
- Sharon F Johnson, BA
- Phone Number: 434-982-3198
- Email: sfj8n@virginia.edu
-
Contact:
- Kambiz Kalantarinia, MD
- Phone Number: 4349823198
- Email: KK6C@hscmail.mcc.virginia.edu
-
Principal Investigator:
- Kambiz Kalantarinia, MD
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Healthy Adult - 18 to 50 years old
- All ethnicity and genders
Exclusion Criteria:
- Pregnancy or lactation
- Active infection
- Hypertension
- Chronic Medication Use except Multi Vitamin Use and Birth Control Medications
- Known history of a right to left intra-cardiac shunt
- Known history of pulmonary hypertension, including porto-pulmonary hypertension
- History of allergies to Definity®
- History of Liver or Kidney Transplant
- Patient on hemodialysis
- Has received iodinated contrast within 72 hours of admission to study
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Healthy Test Subjects
We will be using the drug Definity that is an approved medication for cardiac contrast enhanced ultrasound to measure the changes in kidney blood flow with exercise in healthy subjects.
|
Other Names:
During kidney ultrasound, Definity microbubbles will be injected into the vein to see how blood flows through the kidneys
Other Names:
This done before and after exercise with the help of Definity to see changes in kidney blood flow
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in renal blood flow in exercise as assessed by CEUS
Time Frame: Before and immediately after exercise
|
Total, cortical and medullary kidney blood flow will be measured using contrast-enhanced ultrasonography
|
Before and immediately after exercise
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Kambiz Kalantarinia, MD, University of Virginia, Department of Nephrology
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- 18220
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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