Impact of Acute Normovolemic Hemodilution on Blood Viscosity

December 8, 2021 updated by: Tae-Yop Kim, MD PhD, Konkuk University Medical Center

Impact of Intravascular Fluid Resuscitation for Acute Normovolemic Hemodilution on Blood Viscosity and Oxygen Delivery in Coronary Artery Bypass Graft Surgery

Acute normovolemic hemodilution (ANH) has long been employed for reducing allogenic blood transfusion for cardiac surgery, and hydroxyethyl starch has been used as an intravenous replacement fluid during ANH procedure. However, possible impact of ANH employing HES on blood viscosity and oxygen delivery have not been well investigated in patients undergoing off-pump coronary artery bypass (OPCAB) surgery .

Anesthesia is induced and maintained by using propofol-remifentanil-rocuronium in OPCAB surgery (n=21). ANH is performed by using 5 ml/kg of blood salvage and administering 5 ml/kg of balanced HES 130/0.42 (Tetraspan™) for 15 min during vascular graft harvesting. For the present study, three arterial blood samples (3 ml each) are taken before (Sample 1) and after ANH (sample 2 and 3) and they are stored in 3 tubes. Sample 3 (in tube) undergoes further 30% in-vitro dilution by adding 1-1.5 ml HES. By using a scanning capillary tube viscometer (Hemovister™), Blood viscosity at low shear rate (5/sec) of the three samples are determined. By using a formula with blood viscosity and hematocrit, tissue O2 delivery index (TODI, = hematocrit/viscosity at 5/sec) is calculated.

Study Overview

Status

Status

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Completed

Conditions

Conditions

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Intervention / Treatment

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Study Type

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Interventional

Enrollment (Actual)

Enrollment

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21

Phase

Phase

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  • Not Applicable

Contacts and Locations

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Study Locations

Participation Criteria

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Eligibility Criteria

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Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • patients undergoing off-pump coronary artery bypass graft surgery

Exclusion Criteria:

  • Preoperative anemia
  • LV ejection fraction < 50%

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Supportive Care
  • Allocation: Non-Randomized
  • Interventional Model: Factorial Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Acute normovolemic hemodilution
acute normovolemic hemodilution by using hydroxyethyl starch
Procedure: acute normovolemic hemodilution
acute normovolemic hemodilution (ANH) is performed by using 5 ml/kg of blood salvage and intravenously administering 5 ml/kg of balanced hydroxyethystarch 130/0.42 (Tetraspan™) for 15 min
Procedure: In-vitro hemodilution
Blood sample after ANH 5 ml/kg undergoes further 30% in-vitro dilution by adding 1-1.5 ml hydroxyethystarch 130/0.42
Experimental: In-vitro hemodilution
adding additional hydroxyethyl starch for achieving further 30% dilution of whole blood sample which already underwent ANH of 4-6 ml/kg.
Procedure: In-vitro hemodilution
Blood sample after ANH 5 ml/kg undergoes further 30% in-vitro dilution by adding 1-1.5 ml hydroxyethystarch 130/0.42

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
blood viscosity at shear rate 5/sec
Time Frame: 5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution
By using a scanning capillary tube viscometer (Hemovister™), Blood viscosity at shear rate 5/sec of the three samples are determined
5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution
hematocrit/blood viscosity at 5/sec
Time Frame: 5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution
oxygen delivery index calculated with a formula (= hematocrit/blood viscosity)
5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
blood viscosity at shear rate 300/sec
Time Frame: 5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution
By using a scanning capillary tube viscometer (Hemovister™), Blood viscosity at shear rate 300/sec of the three samples are determined
5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution
Hematocrit/viscosity at shear rate 300/sec
Time Frame: 5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution
oxygen delivery index calculated with a formula (= hematocrit/blood viscosity)
5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution
Coagulation profiles in ROTEM
Time Frame: 5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution
clot formation time in extem, MCF in extemA5 in fibtem,
5 min after acute normovoelmic hemodilution, 5 min after in-vitro dilution

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Konkuk University Medical Center

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Tae-Yop Kim, MD PhD, Konkuk University Medical Center

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 2, 2018

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
November 30, 2018

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
November 30, 2018

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 28, 2017

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 3, 2017

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 8, 2017

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
December 29, 2021

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 8, 2021

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
December 1, 2021

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • KUH1160102

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

No

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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