Bariatric Surgery vs. Standard Therapy for Obesity and Diabetes

Introduction: The Obesity Problem and PICO Question

As the obesity rate continues to be an issue of great concern in America, the question arises as to the best ways to reduce the BMIs of individuals already suffering from the condition, as well as how to enact preventative measures. Although the ideal is for people never to become obese at all, the fact remains that there is a need to develop proactive strategies to facilitate weight reduction. For most patients, modifications in diet and exercise are recommended, but — as even people who have attempted casual weight loss know — deploying such techniques in an effective and consistent fashion is far easier said than done.

The PICO framework guides the central clinical question of this paper: from the perspective of a family nurse practitioner, when treating patients with type 2 diabetes and obesity, can bariatric surgery be more effective than standard medical therapy at increasing the probability of remission of diabetes? The patient population in question is obese females with type 2 diabetes; the intervention is bariatric surgery (or other types of weight loss surgery); the comparison is standard medical care consisting of diet and exercise; and the desired outcome is weight loss and improved diabetes management. Surgical intervention always poses at least some risk to patients and is not something to be undertaken lightly, hence the significance of this question to nursing — particularly for practitioners dealing with an increasingly large population of patients suffering from obesity-related conditions.

Systematic Review One: Benefits of Surgical Intervention in Adults

According to a systematic review of seven randomized controlled trials (RCTs) involving bariatric patients conducted by Colquitt et al. (2014), all studies found benefits for surgery in terms of weight loss compared with non-surgical control groups. Improvements included health-related quality of life outcomes and control of diabetes. No deaths occurred during any of the studies, and serious adverse events ranged from 0–37% in the surgical intervention group versus 0–25% in the groups that eschewed surgical intervention — a difference deemed statistically significant. Across the studies that tracked such data, 2%–13% of participants required reoperations. The authors noted, however, that adverse effects across all of the studies were poorly reported in general. Most studies followed up with patients for only one to two years. Three of the studies found that gastric bypass fostered greater weight loss than laparoscopic adjustable gastric banding, suggesting that the more intensive intervention was beneficial for patients.

Overall, the authors concluded, based upon the review, that for patients meeting current BMI criteria for bariatric surgery, the surgery fosters more positive health outcomes than dieting and exercise alone. There was limited data on patients whose body mass indexes fell outside of such criteria, however. The authors concluded that recommending a bariatric intervention would be warranted when weighing the potential risk factors against the benefits of both weight loss and quality of life improvement, but they also cautioned that the quality of evidence within all the RCTs was relatively weak. It should also be noted that although the focus of the PICO study is on female obese patients with diabetes, the Colquitt et al. (2014) review encompassed both male and female patients across the randomized controlled studies it analyzed.

Conclusion and Implications for Nursing Practice

Overall, the evidence suggests that weight loss surgery can hasten BMI reduction compared with non-surgical methods, and existing studies did not find a significantly heightened risk associated with the use of surgery for weight loss. However, the quality of evidence across all the studies was poor, despite the use of RCTs. The relative novelty of bariatric surgery as a weight loss intervention may in part explain this lack of robust data, and future research is clearly needed to establish both its long-term efficacy and its safety profile through rigorous cost-benefit analysis.

The lack of long-term data is especially concerning, given that most studies followed patients for only one to two years. Weight loss is a constant, lifelong struggle for most individuals affected by obesity, and side effects from surgery may only become evident over time. There was no discussion in the reviewed literature of the significance of medical support and therapeutic counseling for patients in the post-intervention period. Finally, little emphasis was placed upon the specific challenges women may face in relation to weight loss surgery. These gaps underscore the need for more targeted, gender-sensitive, and longitudinally rigorous research to better guide clinical decision-making in this area.

References

Colquitt, J. L., Pickett, K., Loveman, E., & Frampton, G. K. (2014). Surgery for weight loss in adults. Cochrane Database of Systematic Reviews, Issue 8. Art. No.: CD003641.

Ells, L. J., Mead, E., Atkinson, G., Corpeleijn, E., Roberts, K., Viner, R., Baur, L., Metzendorf, M. I., & Richter, B. (2015). Surgery for the treatment of obesity in children and adolescents. Cochrane Database of Systematic Reviews, Issue 6. Art. No.: CD011740.

Kitson, S., Ryan, N., MacKintosh, M. L., Edmondson, R., Duffy, J. M. N., & Crosbie, E. J. (2018). Interventions for weight reduction in obesity to improve survival in women with endometrial cancer. Cochrane Database of Systematic Reviews, Issue 2. Art. No.: CD012513.