The Impact of Non-pulsatile Blood Flow on CO2-Reactivity

NCT ID: NCT03732651

Last Updated: 2018-11-06

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

32 participants

Study Classification

INTERVENTIONAL

Study Start Date

2008-06-11

Study Completion Date

2013-12-02

Brief Summary

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The investigators hypothezised that CO2-reactivity of cerebral vessels is affected by systemic non-pulsatile blood flow. Patients undergoing elective cardiac surgery with CPB were enrolled in this prospective case control study. Blood flow velocity in the middle cerebral artery as well as regional cerebral oxygenation was determined during step changes of PaCO2 between 30, 40, and 50 mmHg. Measurements were conducted intraoperatively during non-pulsatile as well as postoperatively after admission to the ICU under pulsatile blood flow.

Detailed Description

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Conditions

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Cerebrovascular Circulation

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

CROSSOVER

Each patient served as his own control.
Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

SINGLE

Outcome Assessors

Study Groups

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non-pulsatile blood flow

Group Type EXPERIMENTAL

alteration of PaCO2 level

Intervention Type PROCEDURE

step changes between 30, 40 and 50 mmHg

pulsatile blood flow

Group Type EXPERIMENTAL

alteration of PaCO2 level

Intervention Type PROCEDURE

step changes between 30, 40 and 50 mmHg

Interventions

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alteration of PaCO2 level

step changes between 30, 40 and 50 mmHg

Intervention Type PROCEDURE

Eligibility Criteria

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Inclusion Criteria

* undergoing elective cardiac surgery with cardiopulmonary bypass

Exclusion Criteria

* Carotid artery stenosis (\> 50%)
* Neurological pathologies
* COPD with CO2 retention
* Women of childbearing age
Minimum Eligible Age

15 Years

Maximum Eligible Age

75 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Medical University of Vienna

OTHER

Sponsor Role lead

Responsible Party

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Cecilia Veraar

Cecilia Veraar

Responsibility Role PRINCIPAL_INVESTIGATOR

Locations

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medical University of Vienna

Vienna, , Austria

Site Status

Countries

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Austria

References

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Veraar CM, Rinosl H, Kuhn K, Skhirtladze-Dworschak K, Felli A, Mouhieddine M, Menger J, Pataraia E, Ankersmit HJ, Dworschak M. Non-pulsatile blood flow is associated with enhanced cerebrovascular carbon dioxide reactivity and an attenuated relationship between cerebral blood flow and regional brain oxygenation. Crit Care. 2019 Dec 30;23(1):426. doi: 10.1186/s13054-019-2671-7.

Reference Type DERIVED
PMID: 31888721 (View on PubMed)

Other Identifiers

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1018730

Identifier Type: -

Identifier Source: org_study_id

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