Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Volume-challenge in Morbid Obesity

This study has been completed.
Information provided by (Responsible Party):
Tomi Pösö, Umeå University Identifier:
First received: December 10, 2012
Last updated: April 28, 2013
Last verified: April 2013
Preoperative venous return stability and euvolemia is essential in management of morbidly obese patients. Fluid therapy regimes for patients with high BMI, especially with focus on preoperative management, are rare and not in consensus.The aim of this study was to evaluate preoperative effects of a standardized, ideal body weight (IBW) based volume-challenge on hemodynamics, stroke volume and level of venous return to the heart.

Condition Intervention
Anomaly; Venous Return
Other: preoperative venous return optimizing

Study Type: Observational
Study Design: Observational Model: Case-Crossover
Time Perspective: Prospective
Official Title: Morbid Obesity and Optimization of Preoperative Fluid Therapy

Further study details as provided by Tomi Pösö, Umeå University:

Primary Outcome Measures:
  • level of venous return [ Time Frame: 0,1 hour ]

Secondary Outcome Measures:
  • Volume-responsiveness [ Time Frame: 0,1 hour ]

Other Outcome Measures:
  • Evaluation of feasibility of dynamic and non-dynamic echocardiographic indices for volume challenge [ Time Frame: 1 hour ]

Enrollment: 34
Study Start Date: March 2011
Study Completion Date: April 2013
Primary Completion Date: April 2013 (Final data collection date for primary outcome measure)
Groups/Cohorts Assigned Interventions
preoperative venous return optimizing
Morbidly obese patients scheduled for bariatric surgery
Other: preoperative venous return optimizing
Preoperative transthoracic echocardiography (TTE) was performed in the awake state before and after volume challenge based on 6ml colloids /kg ideal body weight.

Detailed Description:

34 morbidly obese patients scheduled for bariatric surgery underwent a preoperative three-week preparation by rapid-weight-loss-diet (RWL) to be accepted for bariatric surgery. Preoperative transthoracic echocardiography (TTE) was performed in the awake state before and after volume-challenge (VC) based on 6ml colloids /kg IBW. Feasibility of standardized VC was evaluated by TTE. Dynamic and non-dynamic echocardiographic indices for VC were studied.

Main outcome measures: Volume-responsiveness and level of venous return before and after volume-challenge were assessed by TTE. An increase of stroke volume ≥ 13% was considered as a volume-responder.


Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Morbidly obese patients scheduled for bariatric surgery in Northern part of Sweden; Norrbotten county council.

Inclusion Criteria:

  • enrolled for bariatric surgery
  • BMI ≥ 40 or ≥ 35kg/m2 with co-morbidities
  • preoperative three-weeks preparation by rapid-weight-loss-diet and weight loss

Exclusion Criteria:

  • untreated significant hypertension
  • unstable angina pectoris
  • significant valve regurgitation or stenosis
  • known severe pulmonary disease
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01748513

Sunderby county hospital
Lulea, Norrbotten, Sweden, 97180
Sponsors and Collaborators
Umeå University
Principal Investigator: Tomi P Pösö, MD Norrbotten county council, Umeå University
  More Information

Responsible Party: Tomi Pösö, MD, Umeå University Identifier: NCT01748513     History of Changes
Other Study ID Numbers: 09-042M
Study First Received: December 10, 2012
Last Updated: April 28, 2013

Keywords provided by Tomi Pösö, Umeå University:
morbidly obese patients,
preoperative volume-challenge,
transthoracic echocardiography,
rapid weight loss,
venous return,
bariatric surgery,
left ventricular outflow tract,
stroke volume,
diastolic function,

Additional relevant MeSH terms:
Obesity, Morbid
Nutrition Disorders
Body Weight
Signs and Symptoms processed this record on May 25, 2017