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The Effect of Blood Pressure on Cerebral Perfusion During Vascular Surgery

26. september 2017 opdateret af: Niels Damkjær Olesen, Rigshospitalet, Denmark

The Effect of Blood Pressure on Cerebral Perfusion and Oxygenation During Vascular Surgery

Anesthesia reduces blood pressure and cerebral blood flow is normally considered to be maintained despite marked changes in blood pressure. Vascular surgical patients are often elderly, have high blood pressure and atherosclerosis and in these patients cerebral blood flow may decrease if blood pressure is reduced during anesthesia. The purpose of this study is to assess the effect of blood pressure for preservation of cerebral blood flow during anesthesia in vascular surgery. The hypothesis is that in vascular surgical patients, during anesthesia, cerebral blood flow is higher with blood pressure maintained at a higher level than that used in normal clinical practice.

Studieoversigt

Status

Trukket tilbage

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Background: Induction of anesthesia reduces mean arterial pressure (MAP) and cerebral blood flow is normally considered to be maintained by cerebral autoregulation despite changes in MAP between 60 - 150 mmHg and standard of care during anesthesia is to maintain MAP above 60 mmHg. Vascular surgical patients are often elderly with hypertension and atherosclerotic manifestations that may impair cerebral autoregulation of importance for anesthesia-induced reduction in blood pressure.

Objective: To assess the effect of MAP for preservation of cerebral blood flow and oxygenation during vascular surgery.

Hypothesis: The primary hypothesis is that during general anesthesia in vascular surgical patients, cerebral blood flow velocity and oxygenation is higher with MAP maintained at 80-90 mmHg, compared with a MAP maintained at a minimum of 60 mmHg.

MAP is controlled in both groups using continuous infusion of phenylephrine. Phenylephrine is used as a tool in order to assess the effect of MAP on the cerebral circulation. In both groups, central blood volume is optimized by infusion of lactated Ringer´s solution using a goal directed fluid therapy following induction of anaesthesia and before commencement of phenylephrine infusion.

Trial size: The investigators will include 40 participants (2 x 20) in order to detect or reject a 20% difference in middle cerebral artery velocity with a type I error risk of 5% and a type II error risk of 20% (power at 80%). Interim analysis will be conducted after inclusion of 20 patients (2 x 10). Excluded patients will be replaced.

Undersøgelsestype

Interventionel

Fase

  • Ikke anvendelig

Kontakter og lokationer

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

Studiesteder

  • Danmark
      • Copenhagen Ø, Danmark, 2100
        • Rigshospitalet, Anæstesi og Operationsklinikken 2043

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

19 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Patients undergoing one of the following vascular surgical interventions in general anesthesia: Infra-inguinal bypass, femoro-femoral cross-over bypass or iliofemoral bypass surgery.
  • Age > 18 years. Informed consent

Exclusion Criteria:

  • Use of monoamine oxidase inhibitors
  • Allergy to phenylephrine
  • Patients that cannot cooperate during examination
  • Dementia defined as Mini-Mental State Examination < 24
  • Anesthesia within the last 30 days
  • Alcohol consumption at or above 420 grams per week
  • Lack of fluency in written and spoken Danish
  • Severe hearing and vision impairment
  • Neurological disease

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Støttende pleje
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Tredobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: MAP maintained at 80 mmHg
During anesthesia MAP is maintained at 80 - 90 mmHg MAP using continuous infusion of phenylephrine.
Andet: MAP maintained at 80 mmHg
Intervention group, MAP is maintained at 80 - 90 mmHg during anesthesia using continuous infusion of phenylephrine.
Aktiv komparator: MAP maintained at 60 mmHg
During anesthesia MAP is maintained at minimum of 60 mmHg using continuous infusion of phenylephrine.
Andet: MAP maintained at 60 mmHg
Control group, MAP is maintained at minimum of 60 mmHg during anesthesia using continuous infusion of phenylephrine.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Middle cerebral artery blood velocity
Tidsramme: During surgery
Middle cerebral artery blood velocity measured in [cm/s] assessed by transcranial Doppler. Changes in middle cerebral artery blood velocity reflects changes in cerebral blood flow.
During surgery

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in serum S100B as compared between subjects in the control- and intervention groups
Tidsramme: Blood is sampled 10 min prior to induction of anesthesia and at the end of surgery
Serum concentrations of S100B, a marker of neuronal injury
Blood is sampled 10 min prior to induction of anesthesia and at the end of surgery
Change in serum neuron-specific enolase as compared between subjects in the control- and intervention groups
Tidsramme: Blood is sampled 10 min prior to induction of anesthesia and at the end of surgery
Serum concentrations of neuron-specific enolase, a marker of neuronal injury
Blood is sampled 10 min prior to induction of anesthesia and at the end of surgery
Regional cerebral oxygenation as compared between subjects in the control- and intervention groups
Tidsramme: During surgery
Frontal lobe oxygenation measured as the percentage of oxyhemoglobin of total hemoglobin [%] evaluated by near-infrared spectroscopy
During surgery
Cardiac output as compared between subjects in the control- and intervention groups
Tidsramme: During surgery
Cardiac output measured in [l/min] evaluated by pulse contour analysis of the arterial blood pressure curve
During surgery
Stroke volume as compared between subjects in the control- and intervention groups
Tidsramme: During surgery
Stroke volume measured in [ml/min] evaluated by pulse contour analysis of the arterial blood pressure curve
During surgery

Samarbejdspartnere og efterforskere

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

Sponsor

Rigshospitalet, Denmark

Efterforskere

  • Ledende efterforsker: Niels D. Olesen, MD, Rigshospitalet, Anæstesi og Operationsklinikken 2043, Denmark

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 (Forventet)

1. marts 2017

Primær færdiggørelse (Forventet)

1. november 2017

Studieafslutning (Forventet)

1. november 2017

Datoer for studieregistrering

Først indsendt

14. august 2015

Først indsendt, der opfyldte QC-kriterier

20. august 2015

Først opslået (Skøn)

24. august 2015

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

28. september 2017

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

26. september 2017

Sidst verificeret

1. september 2017

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • NDOlesen

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Kliniske forsøg med Anæstesi

Kliniske forsøg med MAP maintained at 80 mmHg

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