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Factors Determining Oxygen Wash in During Pre-oxygenation

29. september 2021 opdateret af: Lennart Edmark, Region Västmanland

Factors Determining End-tidal O2 Concentration in During Pre-oxygenation

Earlier studies has shown a correlation between older age and longer time for the rise in the end-tidal O2 concentration during pre-oxygenation. In this study the investigators aim to analyse this correlation more closely and investigate if the arterial partial pressure of oxygen (PaO2) as measured before the start of pre-oxygenation, with the patient breathing air, is a better predictor than age for estimating the time necessary for achieving the goal of pre-oxygenation.

Studieoversigt

Status

Afsluttet

Betingelser

Detaljeret beskrivelse

Before induction of general anaesthesia pre-oxygenation is a recommended procedure to enhance the time available for solving a problem with the airway or intubation during induction. This can be accomplished by letting the patient breath normal tidal volumes with 100% oxygen for 3 to 5 minutes during pre-oxygenation. If there is airway closure during tidal volume breathing, pre-oxygenation needs longer time to achieve a maximum effect. Airway closure increases with advanced age and a few earlier studies has also shown a correlation between older age and longer time for the rise in the end-tidal O2 concentration during pre-oxygenation.

Pre-oxygenation is a strongly recommended safety procedure before starting anaesthesia but has at least one major side affect: it is the main reason for the development of atelectasis in the lungs during anaesthesia. Atelectasis impairs oxygenation during anaesthesia and probably increase the risk for postoperative pulmonary complications.

Postoperative complications are more common with advanced age and it is important to understand the mechanisms and risk factors involved.

In this study, the investigators hypothesise that the PaO2 as measured before the start of pre-oxygenation, with the patient breathing air, is a better predictor than age for estimating the time necessary for achieving the goal of pre-oxygenation. If this assumption is correct it might have implication for how pre-oxygenation should be adjusted with advancing age.

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

120

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Sverige
    • Västmanland
      • Köping, Västmanland, Sverige, 73130
        • Köping County Hospital

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

36 år til 75 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

N/A

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Patients scheduled for elective surgery in general anaesthesia.

Beskrivelse

Inclusion Criteria:

  • Patients scheduled for general anaesthesia in American Society of Anesthesiology (ASA) physical status classification grade I-III.
  • Body mass index over 18.5 and less than 30 kg/m2
  • Peripheral oxygen saturation 92% or more on air.

Exclusion Criteria:

  • ASA IV.
  • Patients with active smoking and former smokers with a history of smoking more than 6 pack-years.
  • Chronic obstructive lung disease.
  • Bloodgas with PaO2 ≤ 8 kilopascal (kPa) or PaCO2 ≥ 6.5 kPa.
  • Continuous positive airway pressure treatment at night.
  • Heart failure or angina pectoris.
  • Hemoglobin value less than 100 g/L.
  • Pregnancy.
  • Any neuromuscular or neurologic illness reducing ventilatory capacity.
  • Any endocrine disease influencing basic metabolic demand.
  • Not possible to achieve a tight mask seal.
  • Patient unable to follow instructions.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Observationsmodeller: Kohorte
  • Tidsperspektiver: Fremadrettet

Kohorter og interventioner

Gruppe / kohorte
Age group 40-49
30 patients will be stratified to this age group.
Age group 50-59
30 patients will be stratified to this age group.
Age group 60-69
30 patients will be stratified to this age group.
Age group 70-79
30 patients will be stratified to this age group.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
PaO2 breathing air before start of pre-oxygenation and the rise in end-tidal O2 during pre-oxygenation.
Tidsramme: 5 minutes.
An arterial bloodgas with the patient in the supine position breathing air will be analysed with regards to PaO2 and correlated to the rise in end-tidal O2 concentration during pre-oxygenation.
5 minutes.

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Age and the rise in end-tidal O2 during pre-oxygenation.
Tidsramme: 5 minutes.
Age will be correlated to the rise in end-tidal O2 during pre-oxygenation.
5 minutes.

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Region Västmanland

Efterforskere

  • Ledende efterforsker: Lennart Edmark, Ph.D., Region Västmanland

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

30. oktober 2018

Primær færdiggørelse (Faktiske)

17. september 2021

Studieafslutning (Faktiske)

29. september 2021

Datoer for studieregistrering

Først indsendt

4. januar 2018

Først indsendt, der opfyldte QC-kriterier

4. januar 2018

Først opslået (Faktiske)

10. januar 2018

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

30. september 2021

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

29. september 2021

Sidst verificeret

1. september 2021

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 20170517-184

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