SurgeryOPTIPEPNCT06378710
Haemodynamic and Respiratory Effects of a Low Positive End Expiratory Pressure Associated With a Fluid Challenge in Knee-chest Position
A study testing Optimized PEEP in people with Surgery, run by University Hospital, Caen at 1 site in France.
Trial summary
The genu pectoral position is a surgical position used for spine surgery. This surgical position will lead to physiological hemodynamic and respiratory changes during the procedure. The knee-pectoral position notably induces an increase in CRF and improves pulmonary ventilation/perfusion ratios. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Surgery
- What is being tested?
- Optimized PEEP
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 84 participants
- Where
- 1 siteFrance
- Study dates
- 20 Jan 2023to 30 Jan 2025
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Patient > 18 years old
- Beneficiary of Social Security or CMU
- Surgical operation under general anesthesia requiring a knee-pectoral position
- Dated and signed informed consent
Who cannot join
- BMI > 35 kg/m²
- Hemodynamic instability before placing the knee in the pectoral position.
- ASA class IV or V
- Prolonged intervention > 2 hours
- Lack of consent
- Contraindications to the use of esophageal Doppler
- Concomitant third-party clinical trial that may induce a hemodynamic or respiratory change in the patient
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Haemodynamic and Respiratory Effects of a Low Positive End Expiratory Pressure Associated With a Fluid Challenge in Knee-chest Position- A Randomized Interventional Study
The genu pectoral position is a surgical position used for spine surgery. This surgical position will lead to physiological hemodynamic and respiratory changes during the procedure.
The knee-pectoral position notably induces an increase in CRF and improves pulmonary ventilation/perfusion ratios. On the other hand, it has been shown that it is accompanied by a reduction in cardiac output of approximately 15% Protective perioperative ventilation including a tidal volume between 6 and 8 ml/kg of theoretical ideal weight, PEEP and alveolar recruitment maneuvers is applied in the operating room to reduce postoperative pulmonary complications. The application of high PEEP and the performance of recruitment maneuvers induce arterial hypotension through changes in intra- and transpulmonary pressures. However, investigators hypothesize that the deleterious hemodynamic effects of PEEP seem to counterbalance its beneficial respiratory effects in this particular position.
Read more
The combination of the effects of the knee-pectoral position and protective ventilation could be potentiated and be the cause of the sometimes severe arterial hypotension observed in clinical practice. Since this position improves pulmonary ventilation perfusion ratios, the investigators hypothesized that a lower PEEP and the elimination of intraoperative recruitment maneuvers could be beneficial from a hemodynamic point of view without being deleterious in terms of perioperative pulmonary complications. An exploratory study was carried out at the CAEN University Hospital in 2021 under the name PEEP POSTURE (CLERS Agreement No. 2198 of February 17, 2021) on 90 patients aiming to collect hemodynamic and respiratory parameters in 3 surgical positions: supine decubitus, ventral decubitus , pectoral genu. No difference was found in the evolution of respiratory compliance. On the other hand, a significant drop in SBP, DBP and MAP in the pectoral position was shown compared to the supine group as well as greater vascular filling.
The investigators therefore hypothesize that a reduction in PEEP and optimization of vascular filling could help reduce the adverse effects on blood pressure linked to the surgical position.
- Conditions
- Surgery
- Being tested
- Optimized PEEP
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Optimized PEEPProcedure or surgery
Optimized PEEP
| Study group | Role | What they receive |
|---|---|---|
| control group | No intervention | Standard PEEP (at 7 cmH2o), Vt standardized between [6- 8] ml/kg theoretical ideal weight. Taking NIBP every 3 minutes. |
| Optimized PEEP | Experimental | Optimized PEEP (at 2 cmH2O), filling according to VES monitoring by esophageal Doppler before reversal, Vt standardized between [6-8] ml/kg theoretical ideal weight. Taking NIBP every 3 minutes. Receives: Procedure: Optimized PEEP |
What is being measured
The primary outcome is the main question the study is designed to answer.
Number of occurrences of a MAP
Number of occurrences of a MAP <= 65mmHg per 3 min period occurring during the period of knee pectoral position
Measured: baseline
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted22 Apr 2024
- Study start20 Jan 2023
- Primary completion4 Jan 2024
- Study completion30 Jan 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for SurgeryStudies of the same condition, open and under way.
- More trials run by University Hospital, CaenThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 84 participants (actual)
Sponsor and investigators
- Lead sponsor
- University Hospital, Caen
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06378710
- Sponsor's protocol ID
- 22-0219
- Acronym
- OPTIPEP
- Status last verified
- Apr 2024
- First submitted
- 15 Apr 2024
- Last updated
- 18 Jun 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 18 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Haemodynamic and Respiratory Effects of a Low Positive End Expiratory Pressure Associated With a Fluid Challenge in Knee-chest Position- A Randomized Interventional Study
- ClinicalTrials.gov ID
- NCT06378710
- Acronym / sponsor ID
- OPTIPEP / 22-0219
- Conditions
- Surgery
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 84 participants (actual)
- Lead sponsor
- University Hospital, CaenUniversity, hospital or other
- Study start
- 20 Jan 2023 (actual)
- Primary completion
- 4 Jan 2024 (actual)
- Study completion
- 30 Jan 2025 (actual)
- First posted
- 22 Apr 2024 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The genu pectoral position is a surgical position used for spine surgery. This surgical position will lead to physiological hemodynamic and respiratory changes during the procedure.
The knee-pectoral position notably induces an increase in CRF and improves pulmonary ventilation/perfusion ratios. On the other hand, it has been shown that it is accompanied by a reduction in cardiac output of approximately 15% Protective perioperative ventilation including a tidal volume between 6 and 8 ml/kg of theoretical ideal weight, PEEP and alveolar recruitment maneuvers is applied in the operating room to reduce postoperative pulmonary complications. The application of high PEEP and the performance of recruitment maneuvers induce arterial hypotension through changes in intra- and transpulmonary pressures. However, investigators hypothesize that the deleterious hemodynamic effects of PEEP seem to counterbalance its beneficial respiratory effects in this particular position.
The combination of the effects of the knee-pectoral position and protective ventilation could be potentiated and be the cause of the sometimes severe arterial hypotension observed in clinical practice. Since this position improves pulmonary ventilation perfusion ratios, the investigators hypothesized that a lower PEEP and the elimination of intraoperative recruitment maneuvers could be beneficial from a hemodynamic point of view without being deleterious in terms of perioperative pulmonary complications. An exploratory study was carried out at the CAEN University Hospital in 2021 under the name PEEP POSTURE (CLERS Agreement No. 2198 of February 17, 2021) on 90 patients aiming to collect hemodynamic and respiratory parameters in 3 surgical positions: supine decubitus, ventral decubitus , pectoral genu. No difference was found in the evolution of respiratory compliance. On the other hand, a significant drop in SBP, DBP and MAP in the pectoral position was shown compared to the supine group as well as greater vascular filling.
The investigators therefore hypothesize that a reduction in PEEP and optimization of vascular filling could help reduce the adverse effects on blood pressure linked to the surgical position.
Study design
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| control group | No intervention | –Standard PEEP (at 7 cmH2o), Vt standardized between [6- 8] ml/kg theoretical ideal weight. Taking NIBP every 3 minutes. |
| Optimized PEEP | Experimental | Procedure: Optimized PEEPOptimized PEEP (at 2 cmH2O), filling according to VES monitoring by esophageal Doppler before reversal, Vt standardized between [6-8] ml/kg theoretical ideal weight. Taking NIBP every 3 minutes. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Patient > 18 years old
- Beneficiary of Social Security or CMU
- Surgical operation under general anesthesia requiring a knee-pectoral position
- Dated and signed informed consent
Key exclusion criteria (7 listed)
- BMI > 35 kg/m²
- Hemodynamic instability before placing the knee in the pectoral position.
- ASA class IV or V
- Prolonged intervention > 2 hours
- Lack of consent
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Optimized PEEPOptimized PEEP | Procedure or surgery | Optimized PEEP |
Primary outcome
Number of occurrences of a MAP
Time frame: baseline
Number of occurrences of a MAP <= 65mmHg per 3 min period occurring during the period of knee pectoral position
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 18 Jun 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Optimized PEEP in people with Surgery, run by University Hospital, Caen at 1 site in France.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 7 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 18 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in France. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Number of occurrences of a MAP (time frame: baseline). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 18 Jun 2026; AzTrials last refreshed its copy on 7 Nov 2026.