Effect of laparoscopic Roux-en-Y gastric bypass surgery on hemoglobin A1c levels in diabetic patients: a matched-cohort analysis

Daniel E. Mumme, Michelle A. Mathiason, Kara J. Kallies

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Background: Elevated hemoglobin A1c (HbA1c) values are known to increase the risk of diabetic retinopathy, nephropathy, and peripheral neuropathy. The current guidelines recommend maintaining HbA1c values at <7%. We assessed the effect of laparoscopic Roux-en-Y gastric bypass surgery (LRYGB) on HbA1c values in diabetic patients compared with a conventionally treated cohort. Methods: A retrospective review of a prospective bariatric database identified diabetic patients who had undergone LRYGB from 2001 to 2005. A cohort of conventionally treated obese (body mass index >35 kg/m2) diabetic patients was matched by age and gender. The inclusion criteria consisted of a preoperative/initial HbA1c and 2 postoperative/follow-up HbA1c values compiled from our institution's comprehensive electronic medical record system. The patients in the LRYGB cohort were also required to have had a 1-year postoperative weight recorded. Statistical analysis was performed using the Student t test. Results: Each cohort consisted of 40 women (78.4%) and 11 men (21.6%). The mean age was 48.8 ± 8.3 years for the surgical cohort and 48.2 ± 8.3 years for the conventionally treated cohort. The mean body mass index was 47.7 ± 5.7 kg/m2 preoperatively for the surgical cohort and 45.1 ± 5.7 kg/m2 initially for the conventionally treated cohort. The mean preoperative/initial HbA1c was 7.5% ± 1.4% and 7.0% ± 1.1% for the surgical and conventionally treated groups, respectively. At 1 year, HbA1c results were available for 46 LRYGB and 41 conventionally treated patients. The corresponding mean HbA1c values were 5.8% ± 1.1% and 7.0% ± .9% (P = .001). At 3 years, the mean HbA1c was 6.1% ± 1.2% and 7.8% ± 1.5% for 28 surgical and 36 conventionally treated patients, respectively (P = .001). The surgical patients' use of oral hypoglycemic medications and/or insulin decreased from 84.3% before surgery to 22.4% at 1 year postoperatively. Conclusion: The patients who underwent LRYGB had a significant and sustained improvement in the HbA1c value compared with the conventionally treated obese patients with type 2 diabetes mellitus.

Original languageEnglish (US)
Pages (from-to)4-10
Number of pages7
JournalSurgery for Obesity and Related Diseases
Volume5
Issue number1
DOIs
StatePublished - Jan 2009

Keywords

  • Bariatric surgery
  • Diabetes mellitus
  • Hemoglobin A1c
  • Laparoscopic Roux-en-Y gastric bypass
  • Obesity

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