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Obesity and Goal-directed Intraoperative Fluid Therapy

This study has been completed.
Information provided by (Responsible Party):
Barbara Kabon, Medical University of Vienna Identifier:
First received: January 19, 2010
Last updated: November 18, 2014
Last verified: November 2014

The purpose of the study is to compare non-obese patients (BMI≤ 30 kg/m2)versus obese patients (BMI> 30 kg/m2) in regard of their respective needs for intraoperative fluid therapy during laparoscopic surgery.

Specifically the investigators will test the hypothesis that subcutaneous tissue oxygenation (PsqO2)is increased in obese patients when fluid management is optimized by means of esophageal Doppler monitoring compared to obese patients undergoing standard fluid management.

Furthermore the investigators will test the hypothesis that PsqO2 is decreased in obese patients undergoing conventional fluid therapy compared to non-obese patients when fluid management is optimized. Thus the investigators assume that PsqO2 is similar in obese and non-obese patients when fluid management is optimized in both groups.

Condition Intervention
Other: Goal directed fluid therapy

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Participant)
Primary Purpose: Treatment
Official Title: Intraoperative Goal-directed Fluid Management in Non-Obese and Obese Patients Undergoing Laparoscopic Surgery

Further study details as provided by Medical University of Vienna:

Primary Outcome Measures:
  • Subcutaneous tissue oxygenation [ Time Frame: intraoperative and 2 postoperative hours ]

Enrollment: 90
Study Start Date: January 2010
Study Completion Date: June 2014
Primary Completion Date: June 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
No Intervention: obese control
Active Comparator: obese goal-directed Other: Goal directed fluid therapy
Fluid will be administered to reach maximal stroke volume during the intraoperative period.
Active Comparator: non-obese goal directed Other: Goal directed fluid therapy
Fluid will be administered to reach maximal stroke volume during the intraoperative period.

Detailed Description:

Hemodynamic stability and normovolemia are critical determinants of tissue perfusion and oxygenation. Adequate tissue oxygenation is essential to maintain normal physiologic functions and to reduce complications, such as wound infections.

Fat tissue is relatively hypoperfused and, therefore, poorly oxygenated. Subcutaneous tissue oxygenation in the obese is thus critically low and even supplemental oxygen only slightly increases subcutaneous oxygenation.It is likely that poor subcutaneous oxygenation in the obese surgical patients results in part from inadequate intraoperative fluid replacement.

It remains unknown how to hydrate obese surgical patients best. The most physiologic approach for perioperative fluid replacement is now thought to be goal-directed management, using stroke volume as the treatment parameter.


Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Non-obese (BMI≤ 30kg/m2) and obese patients (BMI > 30 kg/m2)
  • undergoing laparoscopic elective fundoplication or elective bariatric surgery

Exclusion Criteria:

  • decompensate heart failure
  • documented coronary artery disease
  • renal insufficiency
  • severe chronic obstructive pulmonary disease
  • symptoms of infection or sepsis
  • esophageal disease (excepting gastro-esophageal reflux without any other esophageal alteration).
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Please refer to this study by its identifier: NCT01052519

Department of Anesthesiology, Medical University of Vienna
Vienna, Austria, A-1070
Sponsors and Collaborators
Medical University of Vienna
Principal Investigator: Barbara Kabon, MD MUW
  More Information

Responsible Party: Barbara Kabon, PD. MD., Medical University of Vienna Identifier: NCT01052519     History of Changes
Other Study ID Numbers: 708/2009, local IRB
Study First Received: January 19, 2010
Last Updated: November 18, 2014

Keywords provided by Medical University of Vienna:
Esophageal Doppler monitoring
tissue oxygen tension

Additional relevant MeSH terms:
Nutrition Disorders
Body Weight
Signs and Symptoms processed this record on May 24, 2017