Weight Loss Clinical Data Management: The Function and Importance of Databases

**Management of Clinical Data for Weight Loss**

Paul EO'Brien, Mark Stephens and John B. Dixon

**The Importance of Clinical Data Management in Bariatric Surgery**

The primary goal of bariatric surgery is to improve the health and quality of life of obese patients by controlling the problems associated with obesity. Treating obesity is a lifelong process; weight loss may take 1-3 years to achieve, and maintaining that weight is a long-term process. Patients should never be told, "Your obesity problem is solved; you have reached your ideal weight; your ideal weight can be maintained; you no longer need any further treatment." A continuous medical record is essential for each patient. Most key data for bariatric surgery patients is in quantitative form, such as weight, blood pressure, and serum triglycerides, which can be managed using paper documents. However, this data can be better and easier managed electronically. This chapter will explain the role of electronic databases in managing obese patient data, the best practices for electronic management, and introduce existing methods for implementing database management systems.

**Database Functionality**

Record and track clinical treatment outcomes: weight, comorbidities, and quality of life.

For both patients and doctors, weight is one of the most direct and important parameters reflecting treatment effectiveness. Monitoring weight is a means to reflect improvements in a patient's health and quality of life, not an end in itself; however, weight changes are related to several changes occurring in the body. Weight changes can be expressed in various ways, including kilograms or pounds, excess weight, weight loss, BMI reduction, percentage reduction in excess weight, and percentage reduction in excess BMI. Each method of expression has its reason for use. Electronic databases record monitoring of any or all of these methods of weight change.

The most significant benefit of bariatric surgery to date is the improvement in patients' health, particularly the control of obesity-related comorbidities through weight loss. Recording these changes in patient conditions is an essential part of high-quality medical services. This data allows for adjustments to treatment of obesity-related comorbidities when changes occur in the patient's condition and serves as evidence for treatment cost accounting and surgical indications. Managing data on obesity-related complications is often complex. Some data, such as blood pressure and blood lipids, are usually in numerical form and easier to manage; other clinical data, such as asthma, sleep apnea, and low back pain, are more difficult to grade and quantify. The presence or absence of a symptom, and whether a specific treatment is needed, requires expression using absolute qualitative indicators.

Quality of life (QOL) improvement is the second most important indicator in bariatric surgery after weight. QOL reflects the limitations of physical activity caused by changes in body shape and weight, the psychological embarrassment and loss of self-esteem and confidence due to obesity, and the discrimination often associated with employment and career advancement. QOL is generally quantifiable, making it easy to manage its continuous changes through databases.

**Patient Management**

A busy bariatric surgery clinic typically sees many patients, possibly thousands. Our center has over 2,000 patients undergoing regular follow-up appointments, averaging 150 patients per day. Throughout the follow-up period, patients may see several different doctors. Therefore, it's crucial to present patient information concisely, summarizing all significant changes in the body so that doctors can quickly grasp the patient's current condition-one of the main functions of a database. By recording the disease progression on a computer screen and linking it to weight loss and other physical changes, the data is printed out in reports for family physicians to understand the patient's condition and for record-keeping purposes.

**Monitoring Nutritional Status**

The long-term responsibility after bariatric surgery is to ensure that patients do not suffer from malnutrition due to reduced food intake or malabsorption, especially after surgeries primarily involving malabsorption, such as bile-pancreatic bypass, and partially malabsorption surgeries, such as gastric bypass. Protein malnutrition, iron deficiency, folic acid deficiency, and vitamin B₁₂ deficiency all require careful recording. Regular measurement of these macromolecular and micromolecular nutrients is essential, and the best way to manage these results is electronically.

**To prevent patients from leaving follow-up**

Long-term, planned follow-up is an essential part of bariatric surgery, and surgeons should use various methods to ensure patients are not lost to follow-up. For adjustable surgeries, such as Lap-Band gastric banding, good results are impossible without long-term, planned follow-up. For surgeries known to cause malnutrition, such as bile-pancreatic diversion (BPD) and Y-shaped gastric bypass (RYGB), serious and irreversible physical harm can occur without sufficient follow-up. Loss to follow-up is defined as not having been followed up for 18 consecutive months and being unable to be contacted. Our database automatically lists patients whose last follow-up is more than 12 months ago. We recently reviewed 700 patients who underwent Lap-Band gastric banding, with the longest follow-up time being 6 years and a loss to follow-up rate of 3.6%.