MedTrace Logo

Simultaneous Determination of Blood Pressure by Oscillometry and Photoplethysmography Compared to the Standard Inert Gas Rebreathing Technique

NCT02805413 · Status: UNKNOWN · Phase: NA · Type: INTERVENTIONAL · Enrollment: 18

Last updated 2016-06-20

No results posted yet for this study

Summary

Main objective of the experiment is threefold: 1) to technically test a device for central blood pressure estimation for its applicability in a spaceflight-related environment and on the International Space Station. 2) Furthermore the objective is to compare central blood pressure estimates based on arterial pressure readings of different peripheral arteries. For central blood pressure estimation mathematical transfer functions as described by Karamanoglu and colleagues (11) will be used. 3) Finally the experiments' objective is to simultaneously apply phonocardiography together with ECG and carotid plethysmography to determine cardiac systolic time intervals in parabolic flight during gravity transitions.

Secondary objective of the experiment is to simultaneously measure key variables of the central circulation during gravity transitions to expand the understanding of cardiovascular regulation in weightlessness. Furthermore spirometric measurements shall be performed during a parabolic flight day to observe changes in end-expiratory CO2. Arterial CO2 content is central for cardiovascular regulation.

Our main hypothesis is that there is no difference between different methods of central arteria pressure determination.

Concerning our secondary objective, this experiment is designed as an observational study. Thus no clear hypothesis was generated but the measured cardiovascular and respiratory variables will be analysed regarding differences correlated to gravity.

Conditions

  • BLOOD PRESSURE

Interventions

OTHER

Détermination and comparison of blood pressure

Rebreathings will be performed every parabola (2, 4, 6, 8, 10…). Ultrasound measurements will be performed during the remaining parabolas (1, 3, 5, 7, 9…). The procedure consists of a fixed breathing frequency of 20 breaths per minute and an exact triggered start point for the measurements. . Central blood pressure measurements, finger blood pressure measurements, impedance cardiography, carotid plethysmography and phonocardiography will be performed continuously during the flights. The breaks between parabolas 10 and 11 and 20 and 21 will be used to change subjects, which takes approximately 5 minutes.

Sponsors & Collaborators

  • Novespace

    collaborator INDUSTRY

  • University Hospital, Caen

    lead OTHER

Principal Investigators

  • Pierre DP Denise, PhD · CHU CAEN

Study Design

Allocation
NA
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
65 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2015-04-30
Primary Completion
2018-04-30
Completion
2018-04-30

Countries

  • France

Study Locations

More Related Trials

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02805413 on ClinicalTrials.gov