Obesity Alters Lung Mechanics in Robotic Surgery

March 30, 2020 updated by: William G Tharp, University of Vermont Medical Center

Dynamic Surgical Conditions and Body Habitus Independently Impair Pulmonary Mechanics During Robotic Assisted Laparoscopic Surgery: A Cross-Sectional Study

Intraoperative lung protective ventilation strategies using standardized tidal volumes based on predicted body weight have proven beneficial, but attempts to standardize positive end expiratory pressure (PEEP) settings have not robustly accounted for body habitus or dynamic surgical conditions. Laparoscopic abdominal surgery in Trendelenburg (head-down) is an increasingly common surgical modality that presents a unique physiological challenge to the pulmonary system. In order to delineate the impact of body habitus, pneumoperitoneum, and surgical positioning on intraoperative pulmonary mechanics we conducted an observational study of patients undergoing robotic assisted laparoscopic abdominal surgery in Trendelenburg position. Using esophageal manometry, we partitioned the mechanical properties of the respiratory system into its lung and chest wall components and evaluated the effects of pneumoperitoneum, surgical position, and body mass index (BMI) on transpulmonary pressures, airway and transpulmonary driving pressures, and lung elastance. We hypothesized that increasing BMI would be associated with evidence of increasing atelectasis, increased driving pressures, and elevated lung elastance and that these changes would be exacerbated by pneumoperitoneum and Trendelenburg positioning.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Observational

Enrollment (Actual)

99

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Vermont
      • Burlington, Vermont, United States, 05401
        • University of Vemont Medical Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Patients undergoing robotic assisted laparoscopic abdominal surgery at the University of Vermont Medical Center

Description

Inclusion Criteria:

  • Inclusion criteria were presentation for robotic assisted laparoscopic abdominal surgery in the supine position, age ≥ 18 years, and ability to provide informed consent

Exclusion Criteria:

  • Exclusion criteria included intrinsic lung disease, ≥ 20 pack year smoking history, reactive airways disease, home oxygen requirement, inability to provide informed consent, emergent surgery, or esophageal pathology (i.e., strictures, varices, history of esophageal dilatation or surgery).

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Lean
BMI < 25
Other: no intervention
no intervention - observational only
overweight
BMI 25 - 29.9
Other: no intervention
no intervention - observational only
class i obesity
BMI 30 -34.9
Other: no intervention
no intervention - observational only
class ii obesity
BMI 35 - 39.9
Other: no intervention
no intervention - observational only
class iii obesity
BMI >= 40
Other: no intervention
no intervention - observational only

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Transpulmonary pressure
Time Frame: during the surgical procedure
during the surgical procedure

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Vermont Medical Center

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

November 22, 2017

Primary Completion (Actual)

July 12, 2019

Study Completion (Actual)

July 12, 2019

Study Registration Dates

First Submitted

March 30, 2020

First Submitted That Met QC Criteria

March 30, 2020

First Posted (Actual)

April 1, 2020

Study Record Updates

Last Update Posted (Actual)

April 1, 2020

Last Update Submitted That Met QC Criteria

March 30, 2020

Last Verified

March 1, 2020

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • M18-0048

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Obesity

Clinical Trials on no intervention

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Cyprus

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Subscribe