• Improvement of comorbidities [ Time Frame: Within 1 year ] [ Designated as safety issue: No ]
  

• Mortality, weight loss, surgical complications [ Time Frame: Within 1 year ] [ Designated as safety issue: No ]
  

Participants in the BOLD study include all patients who have signed an approved informed consent document who 1) have bariatric surgery performed at an American Society for Bariatric Surgery designated Bariatric Surgery Center of Excellence, including centers which have Provisional Status designation, and 2) have bariatric surgery performed by a Fellow of the American Society for Bariatric Surgery, regardless of whether the surgery is performed at a designated Bariatric Surgery Center of Excellence. Patients under 18 years of age will be included if an informed consent document is signed by an authorized legal representative.

Informed consent will be obtained by the surgeon performing the surgery or a designee. The informed consent document and information pertaining to the BOLD study will be provided to the patient at the first pre-operative visit. The informed consent document must be signed by the surgeon or designee and the patient or the patient's authorized legal representative. The original signed informed consent document will be retained by the surgeon in a study file. A copy of the signed consent will be placed in the patient's medical record, and a copy of the signed consent will be provided to the patient.

Upon obtaining a signed informed consent document, the surgeon will collect initial data including date of consent, name, date of birth, height, weight, gender, race, ethnicity, and known comorbidities as of the date of the first pre-operative visit.

The following pre-operative data elements will be collected at the last visit prior to surgery. This information includes data collected at the first pre-operative visit which may have changed over time:

• Weight
• Comorbidities including diabetes, functional status, and various cardiovascular, metabolic, pulmonary, gastrointestinal, musculoskeletal, reproductive and psychosocial conditions
• Medications
• Prior bariatric and non-bariatric surgeries
• History of smoking
• Other conditions possibly affecting outcomes
• Whether the planned procedure is a revision or reversal of a prior bariatric surgery

The following operative data elements will be collected:

• Admit date
• Date of surgery
• Last weight before surgery
• Operative time
• Anesthesia time
• Procedure performed
• Surgical approach
• Whether concurrent procedures were performed
• DVT prophylaxis
• Whether intra-operative fluids were received, and amounts
• Anesthesia risk classification
• Adverse pre-discharge events
• Discharge date
• Discharged to location

The following post-discharge data elements will be collected at each post-operative visit:

• Weight
• Rehospitalizations
• Reoperations
• Other events requiring intervention
• Status of comorbidities
• Status of medications

Surgeons participating in the study will attempt to obtain follow-up data on all patients who had surgery once a year for a minimum of at least five years following the date of surgery. Follow-up data can be obtained by the operating surgeon or designee, or by the patient's primary care physician and reported to the surgeon.