The Relationship Between BCM, Arterial Stiffness and Hemodynamic Instability During Induction of General Anesthesia

February 26, 2019 updated by: Professor Adrian Covic, Grigore T. Popa University of Medicine and Pharmacy

The Relationship Between Volemic Status as Assessed by Bioimpedance Spectroscopy, Arterial Stiffness and Hemodynamic Instability During Induction of General Anesthesia

Arterial hypotension during induction of general anesthesia is a risk factor for developing postoperative cardiovascular complications. After induction of general anesthesia patients have a high risk of developing arterial hypotension due to anesthetic drugs who can depress cardiac contractility and determine vasodilatation. Previous studies have shown that even short periods of hypotension with a mean arterial pressure of less than 55 mmHg during surgery is associated with an increased incidence of cardiac injury and acute kidney injury in the postoperative period.

The volemic status of the patients in the preoperative period is very difficult to quantify and can vary due to comorbidities of the patient, chronic treatment, preoperative fasting. Bioimpedance is recognized by over 30 years as a simple and non invasive technique to determine the volemic status especially in the hemodialysed patients. A new device BCM- Body Composition Monitoring (Fresenius Medical Care) offers a simple method to determine extracellular water and total body water. These volumes are determined by measuring impedance at 50 different frequencies thru electrodes placed at the ankle and wrist. BCM can also determine lean tissue mass and adipose tissue mass.

Increasing arterial stiffness is the main characteristic of arterial aging; this increase determines the increase of the afterload, left ventricular hypertrophy, the decrease of coronary and tissue perfusion. Arterial applanation tonometry is a non-invasive technique that has been shown to reliably provide indices of arterial stiffness.

In this study investigators wish to determine if there is a correlation between the hidric status determined by BCM, carotid-femural pulse wave velocity determined with SphygmoCor system and the development of hypotension during induction of general anesthesia. The measurements will be obtained before induction of general anesthesia in the pre-surgical area. During induction of general anesthesia with standard induction agents and Bispectral index monitoring, brachial blood pressure will be measured by a cuff every minute after the loss of verbal contact with the patient up to ten minutes after tracheal intubation. A hypotensive response to anesthesia will be defined as a drop in mean arterial pressure below 55mmHg or a drop in mean arterial pressure with more than 40% than the base line value of the patient before the surgery.

Measurement of the hidric status and aortic stiffness may represent a valid indicator of the risk of hypotension during anesthesia induction.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

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.

Detailed Description

Arterial hypotension during induction of general anesthesia is a risk factor for developing postoperative cardiovascular complications. After induction of general anesthesia patients have a high risk of developing arterial hypotension due to anesthetic drugs who can depress cardiac contractility and determine vasodilatation. Risk factors associated with increased incidence of arterial hypotension at induction of general anesthesia are age > 50 years, ASA risk class III or IV, using high doses of propofol or fetanyl at induction. Previous studies have shown that even short periods of hypotension with a mean arterial pressure of less than 55 mmHg during surgery is associated with an increased incidence of cardiac injury and acute kidney injury in the postoperative period. Even if it is known that arterial hypotension is associated with increased incidence of postoperative complications, the inferior limit and duration of hypotension is not well defined. The volemic status of the patients in the preoperative period is very difficult to quantify and can vary due to comorbidities of the patient, chronic treatment, preoperative fasting. Bioimpedance is recognized by over 30 years as a simple and non invasive technique to determine the volemic status especially in the hemodialyzed patients. A new device BCM- Body Composition Monitoring (Fresenius Medical Care) offers a simple method to determine extracellular water and total body water. These volumes are determined by measuring impedance at 50 different frequencies thrue electrodes placed at the ankle and wrist. BCM can also determine lean tissue mass and adipose tissue mass.

Increasing arterial stiffness is the main characteristic of arterial aging; this increase determines the increase of the afterload, left ventricular hypertrophy, the decrease of coronary and tissue perfusion. Increased arterial stiffness is associated with altered ability of maintaining a normal arterial pressure during stress conditions; it is known the risk of orthostatic hypotension in older patients wits increased arterial stiffness Arterial applanation tonometry is asimple, non-invasive technique that has been shown to reliably provide indices of arterial stiffness. Measuring carotid-femural pulse wave velocity thrue applanation tonometry is considered the "gold standard" for measuring arterial stiffness.In this study carotid-femoral pulse wave velocity will be determined by applanation tonometry using the Sphygmocor system by sequentially recording ECG-gated carotid and femoral artery waveforms. Pulse wave signals will be recorded by tonometers positioned at the base of the right common carotid artery and over the right femoral artery.

In this study investigators wish to determine if there is a correlation between the hidric status determined by BCM, carotid-femural pulse wave velocity determined with SphygmoCor system and the development of hypotension during induction of general anesthesia. The measurements will be obtained before induction of general anesthesia in the pre-surgical area. During induction of general anesthesia with standard induction agents(fentanyl propofol, rocuronium) and Bispectral index monitoring, brachial blood pressure will be measured by a cuff every minute after the loss of verbal contact with the patient up to ten minutes after tracheal intubation. A hypotensive response to anesthesia will be defined as a drop in mean arterial pressure below 55mmHg or a drop in mean arterial pressure with more than 40% than the base line value of the patient before the surgery.

Study population : patients who are going under surgery. Inclusion criteria: there will be two study populations. The first study population will represent patients scheduled for surgery for a new diagnosed cancer pathology. The second study population will represent patients scheduled for surgery not for cancer disease. Exclusion criteria: diabetes (on insulin therapy), renal insufficiency (creatinine>2.0mg/dl), history of arterial bypass), history of carotid endoarterectomy, atrial fibrillation/flutter, history of ischemic stroke, transient ischemic attack, myocardial infarction or coronary revascularization (any type) within 6 months, known left main or 3-vessel coronary disease positive myocardial perfusion study without subsequent revascularization, heart failure (>3 NYHA) class 3, known left ventricle ejection fraction <30%, pulmonary hypertension (PA systolic >50mmHg), right ventricle dysfunction, sepsis, pregnancy, limb amputation.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Anticipated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
150

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (ADULT, OLDER_ADULT)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

patients scheduled for surgery for a new diagnosed cancer pathology

Description

Inclusion Criteria:

- patients scheduled for surgery for a new diagnosed cancer pathology

Exclusion Criteria:

  • diabetes (on insulin therapy),
  • renal insufficiency (creatinine>2.0mg/dl),
  • history of arterial bypass, carotid endoarterectomy,
  • history of atrial fibrillation/flutter, ischemic stroke, transient ischemic attack, myocardial infarction or coronary revascularization (any type) within 6 months,
  • known left main or 3-vessel coronary disease positive myocardial perfusion study without subsequent revascularization,
  • heart failure (>3 NYHA) class 3, known left ventricle ejection fraction <30%, pulmonary hypertension (PA systolic >50mmHg), right ventricle dysfunction,
  • sepsis,
  • pregnancy,
  • limb amputation.

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

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
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.
cancer patients
The first study population will represent patients scheduled for surgery for a new diagnosed cancer pathology
Diagnostic test: bioimpedance spectroscopy

Bioimpedance spectroscopy-The technique involves attaching electrodes to the patient's forearm and ipsilateral ankle, with the patient in a supine position. The BCM measures the body resistance and reactance to electrical currents of 50 discrete frequencies, ranging between 5 and 1000 kHz. Based on a fluid model using these resistances, the extracellular water (ECW), the intracellular water (ICW) and the total body water (TBW) are calculated. These volumes are then used to determine the amount of fluid.

Carotid-femoral pulse wave velocity-will be determined by arterial applanation tonometry using the Sphygmocor system by sequentially recording ECG-gated carotid and femoral artery waveforms.. Pulse wave signals will be recorded by tonometers positioned at the base of the right common carotid artery and over the right femoral artery.

Other Names:
  • Carotid-femoral pulse wave velocity
non-cancer patients
The second study population will represent patients scheduled for surgery not for cancer disease
Diagnostic test: bioimpedance spectroscopy

Bioimpedance spectroscopy-The technique involves attaching electrodes to the patient's forearm and ipsilateral ankle, with the patient in a supine position. The BCM measures the body resistance and reactance to electrical currents of 50 discrete frequencies, ranging between 5 and 1000 kHz. Based on a fluid model using these resistances, the extracellular water (ECW), the intracellular water (ICW) and the total body water (TBW) are calculated. These volumes are then used to determine the amount of fluid.

Carotid-femoral pulse wave velocity-will be determined by arterial applanation tonometry using the Sphygmocor system by sequentially recording ECG-gated carotid and femoral artery waveforms.. Pulse wave signals will be recorded by tonometers positioned at the base of the right common carotid artery and over the right femoral artery.

Other Names:
  • Carotid-femoral pulse wave velocity

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
Correlation between the hydric status determined by BCM and the development of hypotension during induction of general anesthesia
Time Frame: 2 years
Correlation between the hydric status determined by BCM and the development of hypotension during induction of general anesthesia
2 years
Correlation between arterial stiffness and hypotension during induction of general anesthesia
Time Frame: 2 years
Correlation between the carotid-femural pulse wave velocity determined with SphygmoCor system and the development of hypotension during induction of general anesthesia
2 years

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.
Grigore T. Popa University of Medicine and Pharmacy

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.
  • Study Chair: Dimitrie Siriopol, MD, PhD, GRT POPA

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.
January 3, 2017

Primary Completion (ANTICIPATED)

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.
March 1, 2019

Study Completion (ANTICIPATED)

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.
July 1, 2019

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).
July 30, 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.
July 30, 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.
August 2, 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.
February 27, 2019

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.
February 26, 2019

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.
February 1, 2019

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.
  • GTPopaUMP

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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