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You are here: Home / Abstracts / Does Age or Preoperative BMI Influence Weight Loss After Bariatric Surgery?

Does Age or Preoperative BMI Influence Weight Loss After Bariatric Surgery?

Kate Mellion, MD, Tyler Jones, MD, Lala Hussain, MSc, MHA, George Kerlakian, MD, Kevin Tymitz. Good Samaritan Hospital

INTRODUCTION: This study was designed to determine whether age or preoperative body mass index (BMI) influenced weight loss in bariatric patients undergoing sleeve gastrectomy (SG).

METHODS AND PROCEDURES: A retrospective chart review was conducted of adult bariatric surgery patients undergoing SG at a single institution from March 2012 to December 2015. Patients were identified using procedure code. Patients who had a previous gastric band were excluded. Demographic variables included age, race, gender, preoperative BMI, American Society of Anesthesiologists (ASA) class, and comorbidities. The outcome measure, percent of excess weight loss (%EWL), was calculated from postoperative weight at 6, 12 and 24 months.  30-day mortality and readmissions were also reported. The %EWL was compared among both age groups (<35 years, 35-50 years, >50 years) and preoperative BMI (<35, 35-40, 40-50, >50). One-way ANOVA or the Kruskal-Wallis test was used to compare continuous data across all groups. Subsequent analysis of categorical data was achieved by Chi-square or Fisher’s Exact test. Statistical significance was accepted as p<0.05. 

RESULTS: A total of 160 patients (20% male) were analyzed. Average age and preoperative BMI were 45.8 (10.9) years and 44.8 (8.2) kg/m2, respectively. Preoperative comorbidities included: diabetes (20.6%), hypertension (46.3%), hyperlipidemia (29.4%), previous myocardial infarction (1.9%), obstructive sleep apnea (30.0%), chronic obstructive pulmonary disease (2.5%), gastroesophageal reflux (30.0%), tobacco use (8.8%). The ASA classes of patients undergoing SG were II (14.4%), III (84.4%), and IV (1.3%). The follow up rate at 6, 12 and 24 months was 86.9%, 44.4%, and 18.8%, respectively. The 30-day mortality and readmission rate were 0% and 4.4%, respectively. The %EWL was not different among age groups at 6, 12 or 24 months for the total, male, or female cohorts.  Among preoperative BMI groups, %EWL was not different in any cohort at 12 or 24 months, but was different at 6 months for the total cohort (p<0.001) and female cohort (p<0.001), and trended toward significance in the male cohort (p=0.051). The highest %EWL was found to be in patients with preoperative BMI of 35-40. There was no difference in 30-day mortality or readmissions among groups.

CONCLUSIONS: We found a significant difference in %EWL in patients undergoing SG at 6 months postoperatively among preoperative BMI groups in the total and female cohorts. Patients with preoperative BMI of 35-40 had the highest %EWL without a difference in 30-day mortality or readmission. Optimal timing for bariatric surgery may be at a BMI of 35-40.


Presented at the SAGES 2017 Annual Meeting in Houston, TX.

Abstract ID: 86498

Program Number: P657

Presentation Session: iPoster Session (Non CME)

Presentation Type: Poster

61

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