- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT06190756
Impact of Gravity on Cardiac Hemodynamics (ACUITY)
Effect of Intra-cardiac Hydrostatic Pressure Gradient in Cardiac Filling and Ejection
The goal of this clinical trial is to define and compare pre-load dependance of the cardiac function according to the intracardiac hydrostatic gradient of pressure in healthy and diabetic populations.
Participants will undergo 4 tilt angle and 4 lower body negative pressure intensities during which cardiovascular data will be assessed and a transthoracic echography will be performed.
Study Overview
Status
Conditions
Detailed Description
Gravitational force affects both the cardiac mass and the thoracic compartment. However, few studies in humans have explored whether the relationship between cardiac function and load-dependence varies according to the orientation of the heart in space (e.g. between the upright and supine positions) and therefore according to gravitational stress.
Thirty-two volunteers (16 healthy subjects and 16 subjects with type I diabetes) will be included in the study. Each subject will be analysed over half a day in the Inserm COMETE laboratory. Measurements of the intra-cardiac hydrostatic pressure gradient (reflecting gravitational force) and indicators of cardiac function will be analysed by transthoracic echocardiography using dedicated post-processing software. These measurements will be compared at identical pre-load on the basis of the relationship between thoracic impedance and angle of vertical inclination using a Tilt Test on the one hand and between thoracic impedance and Lower Body Negative Pressure (LBNP) depression in the supine position on the other. In the supine position, the echocardiogram will be repeated for each subject with different levels of intensity of preload decrease by LBNP up to a maximum of -50 torr, and compared with different angles of vertical inclination head up up to +80° on the Tilt Test.
The study aims to compare the contribution of intra-cardiac hydrostatic force to cardiac filling and ejection mechanics in a population of healthy volunteers and subjects with diabetes.
The goal is to define and compare the pre-load dependence of the cardiac function indices studied according to the anatomical supine posture with zero intra-cardiac hydrostatic gradient with the standing posture during which the hydrostatic force is expressed between the cardiac base and apex. The hypothesis is that cardiac filling and ejection are improved when the longitudinal axis of the heart is anatomically oriented in the standing position compared with the supine position, by restoring the intraventricular hydrostatic pressure gradient. Comparing a group of healthy subjects with a group of subjects with diabetes will enable to assess whether the dependence of cardiac function on the orientation of the heart in space is more marked in the presence of subclinical impairment of myocardial function.
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Amir HODZIC, MD PhD
- Phone Number: 0231065503
- Email: hodzic-a@chu-caen.fr
Study Contact Backup
- Name: Hervé NORMAND, MD PhD
- Email: herve.normand@unicaen.fr
Study Locations
-
-
-
Caen, France, 14000
- Recruiting
- Inserm 1075 Comete, Unicaen
-
Contact:
- Amir HODZIC, MD PhD
- Phone Number: 0231065503
- Email: hodzic-a@chu-caen.fr
-
Contact:
- Hervé NORMAND, MD PhD
- Email: herve.normand@unicaen.fr
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Adult
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Affiliated to the social security system
- Patient informed of the study and having signed an informed consent form
- Type 1 diabetes for at least 10 years followed at Caen University Hospital, equipped with a continous glucose monitoring system
Exclusion Criteria:
- Trained athletes (≥ 6 hours of sustained physical exercise >70% VO2max per week for > 6 months)
- Chronic cardiovascular disease or cardiovascular treatment
- Personal history of chemotherapy and/or thoracic radiotherapy
- Cerebral and/or spinal disease
- Inclusion of the subject in another biomedical research protocol of interventional type (during the study or in the 3 months prior to inclusion)
- Pregnant, breast-feeding or parturient women
- Adults under legal protection (guardianship, curators) or unable to express their consent or deprived of their freedom
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: T1 Diabetic group
Group with diabetic patients
|
Tilt of the patient at 4 angles (22°, 42°, 58° and 80°), the order is randomized for 3 angles (22°, 42°, 58°) while 80° will always be last.
Other Names:
The patient will undergo 4 level of LBNP (10Torr, 20Torr, 35Torr, 50Torr), the order is randomized for 3 intensities (10Torr, 20Torr, 35Torr) while 50Torr will always be last.
Other Names:
|
Other: Healthy Control Group
Control group with healthy participants
|
Tilt of the patient at 4 angles (22°, 42°, 58° and 80°), the order is randomized for 3 angles (22°, 42°, 58°) while 80° will always be last.
Other Names:
The patient will undergo 4 level of LBNP (10Torr, 20Torr, 35Torr, 50Torr), the order is randomized for 3 intensities (10Torr, 20Torr, 35Torr) while 50Torr will always be last.
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Heart rythme
Time Frame: baseline, during the intervention
|
continuous electrocardiogram monitoring for assessing the variation of heart frequency
|
baseline, during the intervention
|
Arterial blood pressure
Time Frame: baseline, during the intervention
|
continuous central arterial pressure monitoring using Finapress
|
baseline, during the intervention
|
thoracic Impedancemetry
Time Frame: baseline, during the intervention
|
estimation of body fluid variation as a surrogate of prelaod
|
baseline, during the intervention
|
Echocardiography
Time Frame: baseline, during the intervention
|
non invasive diastolic intraventricular pressure gradient
|
baseline, during the intervention
|
Collaborators and Investigators
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 23-0077
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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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