Ventilator Study in the NICU
Titration of End-expiratory Lung Volume Using the Capnodynamic Method in Intubated Neurointensive Care Patients - Effects on Driving Pressure, Compliance, and Mixed Venous Oxygen Saturation
Background:
Optimal adjustment of mechanical ventilation in intensive care patients is crucial to ensure effective ventilation and to reduce the risk of ventilator-associated complications such as pneumonia and ventilator-induced lung injury. Current monitoring methods may often be insufficient to achieve truly optimal ventilator settings in routine clinical practice. By applying a specific breathing pattern, additional key ventilation-related parameters can be monitored and adjusted using a novel carbon dioxide-based method. This approach has the potential to substantially improve ventilation in critically ill patients.
The carbon dioxide-based method utilizes a modified intensive care ventilator (Servo-i®, Getinge) equipped with CE-marked research software. The software modifies the breathing pattern by introducing three slightly prolonged expiratory pauses in three out of nine breaths. This ventilator has been used in multiple large-animal studies and clinical trials, including two conducted by the present research group.
Study Design:
The study will include adult patients receiving mechanical ventilation in a neurointensive care unit due to brain injury. Patients must be in a stable phase with regard to neurological status and circulation and require controlled mechanical ventilation. Informed consent will be obtained from the patient after recovery when applicable.
Part 1 (Pilot Study):
This is an observational study including 15 patients, aiming to establish reference values for parameters obtained using the carbon dioxide-based method, such as end-expiratory lung volume and mixed venous oxygen saturation. Patients will be switched to the research ventilator for 15-20 minutes, during which measurements from the carbon dioxide-based method and standard vital sign monitoring will be collected. Ventilator settings will be identical to those used on the patient's conventional ventilator. After completion of the protocol, patients will be switched back to their standard ventilator.
Part 2 (Main Study):
This is an interventional study with a within-subject (self-controlled) design, including 15 mechanically ventilated patients with stable brain injury. The aim is to optimize ventilator settings using the carbon dioxide-based method to achieve more lung-protective ventilation.
Patients will be transferred to the research ventilator using the same procedure as in the pilot study, initially maintaining the same ventilator settings. After a 10-minute stabilization period, ventilatory parameters will be recorded and an arterial blood gas sample obtained (baseline). The specific breathing pattern will then be initiated, and ventilation will be adjusted based on additional parameters provided by the capnodynamic method (end-expiratory lung volume, cardiac output, and mixed venous oxygen saturation). Measurements and arterial blood gases will be repeated immediately after initiation of the breathing pattern and again 15 minutes after ventilator adjustments. The study will then conclude, and the patient will be returned to their standard ventilator using the optimized ventilator settings to potentially ensure patient benefit.
Studie Overzicht
Toestand
Toestand
Conditie
Conditie
Interventie / Behandeling
Interventie / Behandeling
Gedetailleerde beschrijving
Studietype
Studietype
Inschrijving (Geschat)
Inschrijving
Fase
Fase
- Niet toepasbaar
Contacten en locaties
Studiecontact
Studiecontact
- Naam: Håkan Björne, Docent
- Telefoonnummer: +46812374719
- E-mail: hakan.bjorne@regionstockholm.se
Studie Locaties
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Stockholm, Zweden
- Karolinska University Hospital, Neurointensive care unit
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Contact:
- Håkan Björne, Docent
- Telefoonnummer: +46812374719
- E-mail: hakan.bjorne@regionstockholm.se
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Deelname Criteria
Geschiktheidscriteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
- Volwassen
- Oudere volwassene
Accepteert gezonde vrijwilligers
Beschrijving
Inclusion Criteria:
- Stable with regard to intracranial pressure
- Hemodynamically stable
Exclusion Criteria:
- Ongoing instability with regard to intracranial pressure and circulation
- Spontaneous breathing / patient-triggered ventilation
- If the patient subsequently declines consent
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Behandeling
- Toewijzing: NVT
- Interventioneel model: Opdracht voor een enkele groep
- Masker: Geen (open label)
Aantal wapens
Wapens en interventies
Deelnemersgroep / ArmDeelnemersgroep / Arm |
Interventie / BehandelingInterventie / Behandeling |
|---|---|
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Experimenteel: Single group vetilation arm, both for pilot and main study
Intervention i main study will be adjusting ventilator settings using capnodynamic parameters to minimize driving pressure.
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Applying the capnodynamic method using a modified intensive care ventilator and subsequently use additional parameters like effective lung volume (ELV) in order to adjust ventilator settings to minimize driving pressure.
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Wat meet het onderzoek?
Primaire uitkomstmaten
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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Driving pressure (deltaP) cmH2O.
Tijdsspanne: Study protocols will have a time frame och 15-30 minutes.
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Difference in driving pressure (dP) before and after ventilatory adjustments.
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Study protocols will have a time frame och 15-30 minutes.
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Secundaire uitkomstmaten
Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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ELV (ml)
Tijdsspanne: 15-30 minutes
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Normal values of effective lung volume (ELV) with patients int 30 degrees head up position.
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15-30 minutes
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Medewerkers en onderzoekers
Sponsor
Sponsor
Publicaties en nuttige links
Algemene publicaties
- Sander CH, Sigmundsson T, Hallback M, Sipmann FS, Wallin M, Oldner A, Bjorne H. A modified breathing pattern improves the performance of a continuous capnodynamic method for estimation of effective pulmonary blood flow. J Clin Monit Comput. 2017 Aug;31(4):717-725. doi: 10.1007/s10877-016-9891-z. Epub 2016 Jun 1.
- Hallsjo Sander C, Hallback M, Wallin M, Emtell P, Oldner A, Bjorne H. Novel continuous capnodynamic method for cardiac output assessment during mechanical ventilation. Br J Anaesth. 2014 May;112(5):824-31. doi: 10.1093/bja/aet486. Epub 2014 Feb 18.
- Sigmundsson TS, Ohman T, Hallback M, Suarez-Sipmann F, Wallin M, Oldner A, Hallsjo-Sander C, Bjorne H. Comparison between capnodynamic and thermodilution method for cardiac output monitoring during major abdominal surgery: An observational study. Eur J Anaesthesiol. 2021 Dec 1;38(12):1242-1252. doi: 10.1097/EJA.0000000000001566.
- Hallsjo Sander C, Hallback M, Suarez Sipmann F, Wallin M, Oldner A, Bjorne H. A novel continuous capnodynamic method for cardiac output assessment in a porcine model of lung lavage. Acta Anaesthesiol Scand. 2015 Sep;59(8):1022-31. doi: 10.1111/aas.12559. Epub 2015 Jun 4.
- Iavarone IG, Rocco PRM, Grieco DL, Rosa T, Pellegrini M, Badenes R, Stevens RD, Asehnoune K, Robba C, Camporota L, Roquilly A. Pathophysiology and clinical applications of PEEP in acute brain injury. Intensive Care Med. 2025 Nov;51(11):2104-2116. doi: 10.1007/s00134-025-08111-9. Epub 2025 Sep 22.
- Ohman T, Sigmundsson TS, Hallback M, Suarez Sipmann F, Wallin M, Oldner A, Bjorne H, Hallsjo Sander C. Clinical and experimental validation of a capnodynamic method for end-expiratory lung volume assessment. Acta Anaesthesiol Scand. 2020 May;64(5):670-676. doi: 10.1111/aas.13552. Epub 2020 Jan 30.
Studie record data
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Studie start (Geschat)
Studie start
Primaire voltooiing (Geschat)
Primaire voltooiing
Studie voltooiing (Geschat)
Studie voltooiing
Studieregistratiedata
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Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
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Updates van studierecords
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Meer informatie
Termen gerelateerd aan deze studie
Trefwoorden
Andere studie-ID-nummers
Andere studie-ID-nummers
- CIV-ID CIV-26-01-055996
- 2026-01383-01 (Andere identificatie: Swedish Ethical Review Authority)
Informatie over medicijnen en apparaten, studiedocumenten
Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel
Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct
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