Vasodilation Effect of Inhalational Anesthetics

Overview

Previous studies on animals suggest that inhalational anesthetics can reduce vascular tension in vitro resulting in vasodilation and decrease in blood pressure. This role for inhalational anesthetics has essential clinical implications such as the condition of sepsis or septic shock or other shock-associated states during which the blood vessel constricts strongly and leads to circulation dysfunction. The vasodilation property of these anesthetics including halothane, isoflurane, sevoflurane, desflurane and enflurane enables them to be better options than other general anesthetics in many clinical conditions needing the vasculature to be dilated. The investigators hypothesized that these inhalational anesthetics can evoke vasodilation measured with ultrasonography during general anesthesia in vivo as the in vitro studies displayed.

Full Title of Study: “Vasodilation Effect of Inhalational Anesthetics Including Halothane, Isoflurane, Sevoflurane, Desflurane and Enflurane”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Parallel Assignment
    • Primary Purpose: Treatment
    • Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
  • Study Primary Completion Date: December 2009

Interventions

  • Drug: Halothane
    • Induction: 2-4% halothane pluses 3-5 L/min oxygen Maintenance: different doses from 0.5% to 3% with 1-2 L/min oxygen
  • Drug: Isoflurane
    • Induction: 2-5% isoflurane pluses 3-5 L/min oxygen Maintenance: different doses from 1% to 4% with 1-2 L/min oxygen
  • Drug: Sevoflurane
    • Induction: 3-8% sevoflurane pluses 3-5 L/min oxygen Maintenance: different doses from 1% to 4% with 1-2 L/min oxygen
  • Drug: Desflurane
    • Induction: 2-8% desflurane pluses 3-5 L/min oxygen Maintenance: different doses from 1% to 4% with 1-2 L/min oxygen
  • Drug: Enflurane
    • Induction: 2-5% enflurane pluses 3-5 L/min oxygen Maintenance: different doses from 1% to 4% with 1-2 L/min oxygen

Arms, Groups and Cohorts

  • Active Comparator: 1
    • Halothane anesthesia: induction and maintenance with different doses
  • Experimental: 2
    • Isoflurane anesthesia: induction and maintenance with different doses
  • Experimental: 3
    • Sevoflurane anesthesia: induction and maintenance with different doses
  • Experimental: 4
    • Desflurane anesthesia: induction and maintenance with different doses
  • Experimental: 5
    • Enflurane anesthesia: induction and maintenance with different doses

Clinical Trial Outcome Measures

Primary Measures

  • Ultrasonography of blood vessels including radial artery, brachial artery, femoral artery, popliteal artery
    • Time Frame: Ten min prior to anesthesia; 0 min of anesthesia; 0 min of the end of anesthesia induction; 5, 10, 20, 30, 60 min during maintenance of the anesthesia

Secondary Measures

  • Blood flow volume during anesthesia of the vasculature
    • Time Frame: Ten min prior to anesthesia; 0 min of anesthesia; 0 min of the end of anesthesia induction; 5, 10, 20, 30, 60 min during maintenance of the anesthesia
  • Blood pressure including systolic, diastolic and mean artery blood pressures
    • Time Frame: Ten min prior to anesthesia; 0 min of anesthesia; 0 min of the end of anesthesia induction; 5, 10, 20, 30, 60 min during maintenance of the anesthesia
  • The time interval of between the initiation of the inhalational anesthetics delivered to the beginning of decreasing of blood pressure
    • Time Frame: From the beginning of anesthesia (0 min) till the first time of blood pressure decreased, this measure would be varied according to different individuals
  • The total dose of phenylephrine required to maintain baseline arterial blood pressure
    • Time Frame: From the beginning of anesthesia (0 min) to 20 min after anesthesia begun
  • Regression and correlation analyses between different doses of the anesthetics and the extent of vasodilation
    • Time Frame: Forty eight hours after operation

Participating in This Clinical Trial

Inclusion Criteria

  • Must be undergoing general anesthesia – Age between 19-45 years Exclusion Criteria:

  • With hypertension – Existing organic dysfunction – Allergic to inhalant anesthetics – Alcohol addictive or narcotic dependent patients – A history of the use of centrally-acting drugs of any sort, chronic pain and psychiatric diseases records

Gender Eligibility: All

Minimum Age: 19 Years

Maximum Age: 45 Years

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Nanjing Medical University
  • Provider of Information About this Clinical Study
    • XiaoFeng Shen, Nanjing Medical University
  • Overall Official(s)
    • XiaoFeng Shen, MD, Study Director, Nanjing Medical University

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