Evaluating Prognostic Contribution of Lactate on Recovery of Spontaneous Cardiac Activity After Cardiac Arrest (PROLAC)

March 20, 2026 updated by: Centre Hospitalier Universitaire de Nice

A Pilot Study Evaluating the PROgnostic Contribution of Venous Lactate for the Recovery of Spontaneous Cardiac Activity, Following an Extra-hospital Cardiac Arrest "PROLAC Study"

Incidence of non-hospital cardio-respiratory arrest (ACR) in France is around 40 000 cases per year, with mortality remaining very high, with 75% of patients dying before arrival in hospital. The investigators know some validated predictive factors for recovery of spontaneous cardiac activity (RACS) such as age, no flow (time between ACR and onset of CPR), type of initial electrical activity (FV, TVSP), or the value of CO2 expired.

However, the use of these prognostic criteria in the conduct of CPR maneuvering is in practice limited. Lactate is now a well-known prognostic biological marker used in many pathological conditions such as shock states or the severe traumatized patient. Some data have also demonstrated the prognostic value of lactate on morbidity and mortality after ACR after resumption of spontaneous cardiac activity.

The hypothesis of our study is that the evaluation of the initial lactate in the early cardiopulmonary resuscitation could be a prognostic factor of RACS.

Study Overview

Status

Status

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

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

Incidence of non-hospital cardio-respiratory arrest (ACR) in France is around 40 000 cases per year, with mortality remaining very high, with 75% of patients dying before arrival in hospital. This disease is associated with a high morbidity since today the investigator find less than 5% survival at 1 year with a favorable neurological outcome.

The recommendations of ILCOR 2015 underline in this case the importance of implementing therapeutic measures in the extra-hospital step. Indeed, the survival of ACR patients will depend mainly on the alert delay at the UAS center, the immediate implementation of cardiopulmonary resuscitation (CPR) maneuvers and the early delivery of external electric shock.

The investigators know some validated predictive factors for recovery of spontaneous cardiac activity (RACS) such as age, no flow (time between ACR and onset of CPR), type of initial electrical activity (FV, TVSP), or the value of CO2 expired.

However, the use of these prognostic criteria in the conduct of CPR maneuvering is in practice limited.

Today, none of these prognostic factors allow us to adapt the cardiopulmonary resuscitation maneuvers to the different clinical situations, and it is recognized that a CPR must be carried out for 30 minutes in all cases.

On the basis of these data, it seemed important to investigate other predictive factors for RACS, which would remain simple to implement, and allow case-by-case customization the cardiopulmonary resuscitation.

Lactate is now a well-known prognostic biological marker used in many pathological conditions such as shock states or the severe traumatized patient. Some data have also demonstrated the prognostic value of lactate on morbidity and mortality after ACR after resumption of spontaneous cardiac activity. Unfortunately, all of these studies were carried out intra-hospital. To date, no prospective study has demonstrated the prognostic value of a lactate assay as soon as the pre-hospital medical team arrives and during pre-hospital cardiopulmonary resuscitation.

An experimental study published in the American Journal of Emergency Medicine in 1985, however, suggests that early evaluation of lactate in the course of cardiac arrest may be a valuable prognostic factor. Indeed, in this study on canine cardiac arrest experimental model, Donna et al found that the lactate concentration would reliably predict the no-flow describing an linear increase of lactate as a function of the no-flow duration. If these results can be extrapolated to humans, lactate measurement from the arrival of the pre-hospital medical team could provide an estimate of the no-flow period and therefore a reliable and easily reproducible predictive factor for RACS .

In addition, improvements in biomedical equipment allow us to perform lactate assays directly at the patient's bedside, with reliable results in just 13 seconds.

The hypothesis of our study is that the evaluation of the initial lactate in the early cardiopulmonary resuscitation could be a prognostic factor of RACS.

For this purpose, the investigators propose to carry out a prospective, open, multicenter intervention study in different SMURs in the PACA region, in France.

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.
Interventional

Enrollment (Actual)

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.
77

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

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

Study Locations

  • France
    • Provences Alpes Cote d'Azur
      • Nice, Provences Alpes Cote d'Azur, France, 06000
        • CHU de Nice

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

No

Description

Inclusion Criteria:

  • Male >18 years of age
  • Women over 50 years of age (ie, with amenorrhea> 1 year).
  • Victim of non-traumatic cardiopulmonary arrest.
  • Medical decision to start or continue cardiopulmonary resuscitation.
  • Consent of family or person of trust if present (and patient as soon as possible).
  • patient affiliated to the social security

Exclusion Criteria:

  • Refusal of family or trusted person to participate in the study
  • Pre-paramedical management with use of adrenaline and protection of the airways
  • Use of the intraosseous line from the outset or after failure of the peripheral venous pathway by the medical team outside hospital
  • Minor Patient
  • vulnerable patient under legal protection (guardianship or curators)

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: Other
  • Allocation: N/A
  • Interventional Model: Single Group 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: cardio-respiratory arrest
Biological: venous lactate
value of venous lactate

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
venous lactate
Time Frame: at baseline
The main evaluation criteria will be the value of the venous lactate that was measured during insertion of the peripheral venous line at the arrival of the medical team (= T0) in patients in cardiac arrest
at baseline

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
Initial value of capillary lactate
Time Frame: at baseline
to compare with the initial venous lactate value measured at the peripheral venous laying
at baseline
The no-flow
Time Frame: at baseline
This data will be obtained by interrogating the witnesses present during the cardiac arrest.
at baseline
The kinetics of capillary lactate
Time Frame: at time = 10 minutes
to evaluate by the variability of capillary lactate levels
at time = 10 minutes
The kinetics of capillary lactate
Time Frame: at time = 20 minutes
to evaluate by the variability of capillary lactate levels
at time = 20 minutes
The kinetics of capillary lactate
Time Frame: at time = 30 minutes
to evaluate by the variability of capillary lactate levels
at time = 30 minutes

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.
Centre Hospitalier Universitaire de Nice

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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.
December 19, 2017

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.
August 10, 2020

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.
August 10, 2020

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).
October 23, 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.
October 27, 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.
October 30, 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.
March 24, 2026

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.
March 20, 2026

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.
March 1, 2026

More Information

Terms related to this study

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.
  • 16-AOI-03

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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