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Related Concept Videos

Pharmacokinetics in Obese Patients: Drug Absorption and Distribution01:25

Pharmacokinetics in Obese Patients: Drug Absorption and Distribution

404
Obesity significantly alters the pharmacokinetic processes of drug absorption and distribution, presenting unique challenges in medical treatment. The increased fat tissue and decreased lean muscle in obese individuals can significantly affect how drugs are absorbed into the body and distributed across different tissues. This alteration can lead to variances in the effectiveness and safety of medications, necessitating adjustments in dosing or drug selection for obese patients.One notable...
404

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Related Experiment Video

Updated: Apr 11, 2026

One-anastomosis Gastric Bypass OAGB in Rats
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Differences in open versus laparoscopic gastric bypass mortality risk using the Obesity Surgery Mortality Risk Score

Robert E Brolin1, Ronald P Cody2, Stephen W Marcella2

  • 1Department of Surgery; University Medical Center of Princeton at Plainsboro, Plainsboro, New Jersey.

Surgery for Obesity and Related Diseases : Official Journal of the American Society for Bariatric Surgery
|June 7, 2015
PubMed
Summary

The Obesity Surgery Mortality Risk Score (OS-MRS) shows different predictive values for open versus laparoscopic Roux-en-Y Gastric Bypass (RYGB). While age predicted mortality in open surgery, BMI was the key factor in laparoscopic procedures.

Keywords:
Bariatric surgery complicationsGastric bypassGastrointestinal surgeryMortality riskObesity

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Area of Science:

  • Bariatric Surgery Outcomes
  • Surgical Risk Assessment
  • Obesity Management

Background:

  • The Obesity Surgery Mortality Risk Score (OS-MRS) aids in assessing preoperative mortality risk for bariatric surgery patients.
  • No prior studies have compared the OS-MRS between open and laparoscopic bariatric procedures.

Purpose of the Study:

  • To evaluate differences in mortality risk between open and laparoscopic Roux-en-Y Gastric Bypass (RYGB) using the OS-MRS.
  • To determine the predictive accuracy of OS-MRS factors for each surgical approach.

Main Methods:

  • A retrospective analysis of 2467 primary RYGB patients (1574 open, 893 laparoscopic) across three hospitals.
  • OS-MRS factors (BMI, gender, age>45, hypertension, DVT risk) were analyzed using univariate and multivariate methods.
  • Patients were classified into OS-MRS risk classes A (0-1), B (2-3), and C (4-5).

Main Results:

  • Ninety-day mortality rates were similar: 1.0% for open and 0.9% for laparoscopic RYGB.
  • Pulmonary embolism was the leading cause of death.
  • Univariate analysis identified different significant predictors between groups: BMI, age, gender, and DVT risk in open surgery; BMI and DVT risk in laparoscopic surgery.

Conclusions:

  • The predictive utility of the OS-MRS differs significantly between open and laparoscopic RYGB.
  • Age was a mortality predictor in open surgery but not laparoscopic, despite older patients in the laparoscopic group.
  • BMI showed a trend toward increased mortality risk in both groups, and technique improvements may have reduced laparoscopic mortality over time.