Sevoflurane vs. Isoflurane for Low-Flow General Anaesthesia for Abdominal Surgery

• ClinicalTrials.gov Identifier: NCT00521612
• Recruitment Status: Completed
• First Posted: August 28, 2007
• Last Update Posted: January 7, 2008
• Sponsor: General Hospital Dubrovnik
• Information provided by: General Hospital Dubrovnik

Study Description

Brief Summary:

Two groups of patients are going to have abdominal surgery with low-flow general anaesthesia. Group A (sevoflurane group, experimental group) will use volatile anaesthetic sevoflurane. Group B (isoflurane group, control group) will use volatile anaesthetic isoflurane. It will be observed differences between volatile anaesthetic sevoflurane and volatile anaesthetic isoflurane for providing low-flow general anaesthesia for abdominal surgery. Duration of this randomised controled trial will be approximately 2 months. Estimated sample size will be 82 persons (41 in sevoflurane group and 41 in isoflurane group).

Condition or disease	Intervention/treatment	Phase
Anaesthesia	Drug: sevoflurane; Drug: isoflurane	Not Applicable

Detailed Description:

Two groups of patients are going to have abdominal surgery with low-flow general anaesthesia.

Group A (sevoflurane group, experimental group) Patients will receive midazolam for premedication 45 minutes before surgery. Dose is 0,08 mg/kg i.m. Patients will be preoxygenated with 100 % oxygen with oxygen flow of 7,5 L/min. When peripheral blood saturation reach 100 %, the induction of general anaesthesia will start. For induction patients will get anaesthetic thiopental 4,5 mg/kg i.v., analgetic fentanyl 3 mcg/kg i.v. and muscle relaxant vecuronium 0,1 mg/kg i.v. After 90 seconds patients will be intubated. After intubation anaesthetic gases will be switched on. Oxygen and nitrous oxide (50:50 %) and volatile anaesthetic sevoflurane 1 MAC (2,0 vol%). Patients will be ventilated by anaesthetic device. Intermittent positive pressure ventilation (IPPV) tidal volume 8 mL/kg, respiratory rate 12 times per minute, flow will be 1 L/min. First 20 minutes of anaesthesia will be period of saturation of the body with anaesthetic sevoflurane. After 20 minutes the depth of anaesthesia will be titrated with level of anaesthetic sevoflurane. Change will be +10 % of sevoflurane MAC (0,2 vol%) for every change of signs that indicate shallow anaesthesia. Change will be -10 % of sevoflurane MAC (0,2 vol%) for every change of signs that indicate too deep anaesthesia. Signs that show the depth of anaesthesia are: arterial blood pressure (systolic, diastolic and mean), heart rate and bispectral index (BIS). Measuring points will be every 5 minutes during surgery. The goal is to provide the values of this vital signs within normal physiology ranges. Analgetic fentanyl will be repeated every 45 minutes in the dose of 0,8 mcg/kg i.v. Muscle relaxant vecuronium will be repeated in the dose of 0,5 mg/kg i.v. when train of four (TOF) shows score 30 % or higher. It will also be measured (every 5 minutes): inspiratory and expiratory concentration of sevoflurane, saturation of the blood with oxygen and level of end-tidal carbon dioxide. At the end of surgery, begins awakening from general anaesthesia. All anaesthetic gases will be switched off. Patients will be ventilated manually with 100 % oxygen with oxygen flow of 7,5 L/min. Every patient will get atropin 1 mg + neostigmine 2,5 mg i.v. for decurarization. Measuring points will be: start of awakening, extubation and discharge from operating theatre. It will be measured: arterial blood pressure (systolic, diastolic and mean), heart rate, inspiratory and expiratory concentration of sevoflurane, saturation of the blood with oxygen, level of end-tidal carbon dioxide, BIS and TOF. During surgery each patient will get i.v. infusion 2000 mL of sodium chloride 0.9 %.

Group B (isoflurane group, control group) Patients will receive midazolam for premedication 45 minutes before surgery. Dose is 0,08 mg/kg i.m. Patients will be preoxygenated with 100 % oxygen with oxygen flow of 7,5 L/min. When peripheral blood saturation reach 100 %, the induction of general anaesthesia will start. For induction patients will get anaesthetic thiopental 4,5 mg/kg i.v., analgetic fentanyl 3 mcg/kg i.v. and muscle relaxant vecuronium 0,1 mg/kg i.v. After 90 seconds patients will be intubated. After intubation anaesthetic gases will be switched on. Oxygen and nitrous oxide (50:50 %) and volatile anaesthetic isoflurane 1 MAC (1,2 vol%). Patients will be ventilated by anaesthetic device. Intermittent positive pressure ventilation (IPPV) tidal volume 8 mL/kg, respiratory rate 12 times per minute, flow will be 1 L/min. First 20 minutes of anaesthesia will be period of saturation of the body with anaesthetic isoflurane. After 20 minutes the depth of anaesthesia will be titrated with level of anaesthetic isoflurane. Change will be +10 % of isoflurane MAC (0,12 vol%) for every change of signs that indicate shallow anaesthesia. Change will be -10 % of isoflurane MAC (0,12 vol%) for every change of signs that indicate too deep anaesthesia. Signs that show the depth of anaesthesia are: arterial blood pressure (systolic, diastolic and mean), heart rate and bispectral index (BIS). Measuring points will be every 5 minutes during surgery. The goal is to provide the values of this vital signs within normal physiology ranges. Analgetic fentanyl will be repeated every 45 minutes in the dose of 0,8 mcg/kg i.v. Muscle relaxant vecuronium will be repeated in the dose of 0,5 mg/kg i.v. when train of four (TOF) shows score 30 % or higher. It will also be measured (every 5 minutes): inspiratory and expiratory concentration of isoflurane, saturation of the blood with oxygen and level of end-tidal carbon dioxide. At the end of surgery, begins awakening from general anaesthesia. All anaesthetic gases will be switched off. Patients will be ventilated manually with 100 % oxygen with oxygen flow of 7,5 L/min. Every patient will get atropin 1 mg + neostigmine 2,5 mg i.v. for decurarization. Measuring points will be: start of awakening, extubation and discharge from operating theatre. It will be measured: arterial blood pressure (systolic, diastolic and mean), heart rate, inspiratory and expiratory concentration of isoflurane, saturation of the blood with oxygen, level of end-tidal carbon dioxide, BIS and TOF. During surgery each patient will get i.v. infusion 2000 mL of sodium chloride 0.9 %.

Duration of this randomised controled trial will be approximately 2 months. Estimated sample size will be 82 persons (41 in sevoflurane group and 41 in isoflurane group).

Study Design

• Study Type: Interventional (Clinical Trial)
• Actual Enrollment: 82 participants
• Allocation: Randomized
• Intervention Model: Parallel Assignment
• Masking: Double (Participant, Investigator)
• Official Title: Prospective Randomised Controled Trial: Comparison of Volatile Anaesthetics Sevoflurane vs. Isoflurane for Low-Flow General Anaesthesia for Abdominal Surgery
• Study Start Date: September 2007
• Actual Primary Completion Date: November 2007
• Actual Study Completion Date: November 2007

Arms and Interventions

Arm	Intervention/treatment
Experimental: A; Sevoflurane group, experimental group	Drug: sevoflurane; Volatile anaesthetic sevoflurane 1 MAC (2,0 vol%) will be administer to the patients in the form of gas (via respiration). First 20 minutes of anaesthesia will be period of saturation of the body with anaesthetic sevoflurane. After 20 minutes the depth of anaesthesia will be titrated with level of anaesthetic sevoflurane. Change will be +10 % of sevoflurane MAC (0,2 vol%) for every change of signs that indicate shallow anaesthesia. Change will be -10 % of sevoflurane MAC (0,2 vol%) for every change of signs that indicate too deep anaesthesia. Measuring points will be every 5 minutes during surgery.; Other Name: Sevorane
Active Comparator: B; Isoflurane group, control group	Drug: isoflurane; Volatile anaesthetic isoflurane 1 MAC (1,2 vol%) will be administer to the patients in the form of gas (via respiration). First 20 minutes of anaesthesia will be period of saturation of the body with anaesthetic isoflurane. After 20 minutes the depth of anaesthesia will be titrated with level of anaesthetic isoflurane. Change will be +10 % of isoflurane MAC (0,12 vol%) for every change of signs that indicate shallow anaesthesia. Change will be -10 % of isoflurane MAC (0,12 vol%) for every change of signs that indicate too deep anaesthesia. Measuring points will be every 5 minutes during surgery.; Other Name: Forane

Outcome Measures

Primary Outcome Measures :

1. Differences between volatile anaesthetic sevoflurane and volatile anaesthetic isoflurane for providing low-flow general anaesthesia for abdominal surgery. [ Time Frame: approximately time for this trial is about 2 months ]

Secondary Outcome Measures :

1. Differences in awakening patients from low-flow general anaesthesia provided by sevoflurane and isoflurane. [ Time Frame: approximately time for this trial is about 2 months ]

Eligibility Criteria

• Ages Eligible for Study: 18 Years and older (Adult, Older Adult)
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: No

Criteria

Inclusion Criteria:

• Every patient who is older than 18 years and who volunteer for this randomised controled trial and give written permission for participating in this study.
• Patients ASA I or ASA II.
• Only patients who need elective abdominal surgery (not urgent surgery).
• Patient body mass between 60 and 100 kg.

Exclusion Criteria:

• Patients younger than 18 years
• Patients ASA III and higher
• Patients who need urgent abdominal surgery
• Patients allergic to anaesthetics
• Pregnant women
• Patients with neuromuscular diseases; and
• Persons with epidural analgesia catheter.

Contacts and Locations

Locations

Croatia

General Hospital Dubrovnik

Dubrovnik, Croatia, 20 000

Sponsors and Collaborators

General Hospital Dubrovnik

Investigators

• Principal Investigator: Ante Crncevic, MD, MSc.; specialist in anaesthesiology and intensive care medicine
• Study Chair: Zoran Dogas, MD, PhD.; Professor of Neuroscience, University of Split, School of Medicine

More Information

Additional Information:

Web site of General Hospital Dubrovnik 

Publications:

Mahajan VA, Ni Chonghaile M, Bokhari SA, Harte BH, Flynn NM, Laffey JG. Recovery of older patients undergoing ambulatory anaesthesia with isoflurane or sevoflurane. Eur J Anaesthesiol. 2007 Jun;24(6):505-10. doi: 10.1017/S0265021506001980. Epub 2007 Jan 4.

Venkatesh BG, Mehta Y, Kumar A, Trehan N. Comparison of sevoflurane and isoflurane in OPCAB surgery. Ann Card Anaesth. 2007 Jan;10(1):46-50. doi: 10.4103/0971-9784.37924.

Seitsonen ER, Yli-Hankala AM, Korttila KT. Similar recovery from bispectral index-titrated isoflurane and sevoflurane anesthesia after outpatient gynecological surgery. J Clin Anesth. 2006 Jun;18(4):272-9. doi: 10.1016/j.jclinane.2005.12.005.

Sakai EM, Connolly LA, Klauck JA. Inhalation anesthesiology and volatile liquid anesthetics: focus on isoflurane, desflurane, and sevoflurane. Pharmacotherapy. 2005 Dec;25(12):1773-88. doi: 10.1592/phco.2005.25.12.1773.

Nakayama M, Kanaya N, Edanaga M, Namiki A. Hemodynamic and bispectral index responses to tracheal intubation during isoflurane or sevoflurane anesthesia. J Anesth. 2003;17(4):223-6. doi: 10.1007/s00540-003-0186-4.

• Responsible Party: Ante Crncevic, MD, MSc., General Hospital Dubrovnik
• ClinicalTrials.gov Identifier: NCT00521612
• Other Study ID Numbers: 75736
• First Posted: August 28, 2007
• Last Update Posted: January 7, 2008
• Last Verified: December 2007

Keywords provided by General Hospital Dubrovnik:

sevoflurane; isoflurane; anaesthesia

Additional relevant MeSH terms:

Sevoflurane; Isoflurane; Platelet Aggregation Inhibitors; Anesthetics, Inhalation; Anesthetics, General; Anesthetics; Central Nervous System Depressants; Physiological Effects of Drugs