Resolution of Type 2 Diabetes Mellitus: Intensive vs. Conventional Glycaemic Control After Obesity Surgery

Not Applicable

Completed

Brief Summary: Obesity surgery is very effective in improving or even curing Type 2 Diabetes in patients with obesity. Many patients stop or reduce their medication after surgery and this can happen fairly quickly. The investigators do not know whether strict control of blood glucose/sugar after the operation makes any difference in the long term. Additionally many patients prefer their blood sugars to be a "bit high" because they are afraid of hypos.A number of studies have described patients whose eye, nerve and kidney disease has deteriorated when high sugars are controlled very quickly. The investigators want to ensure that surgery provides maximum benefit and remains safe in patients with diabetes. This study will help us decide if the investigators should be strict with blood glucose after obesity surgery operations or not and whether obesity surgery is safe for the eye, nerve and kidney complications of diabetes.

Detailed Description: Subjects would be randomised into intensive glycaemic control and conventional glycaemic control after obesity surgery. Data on complications of diabetes such as eye, nerve and kidney will be collected before obesity surgery and 1 year after surgery.

Recruitment & Eligibility

Inclusion Criteria

Patients with Type 2 Diabetes Mellitus who have been approved for obesity surgery

Exclusion Criteria

Patients with Type 2 Diabetes Mellitus who do not require insulin immediately after obesity surgery

Arm && Interventions

Group	Intervention	Description
Intensive glycaemic control	Insulin	Intensive glycaemic control All patients will be prescribed insulin glargine once a day. The dose of the insulin will be adjusted to achieve fasting capillary glucose levels between 5-7 in the intensive group and 7-9 mmol/l in the control group.
Conservative glycaemic control	Insulin	Conservative glycaemic control All patients will be prescribed insulin glargine once a day. The dose of the insulin will be adjusted to achieve fasting capillary glucose levels between 5-7 in the intensive group and 7-9 mmol/l in the control group.

Primary Outcome Measures

Name	Time	Method
Percentage of Patients With Type 2 Diabetes Mellitus Who Achieve Fasting Blood Glucose of Less Than 5.6 mmol/l and/or HbA1c of Less Than 6%	1 year after surgery	Patients will be tested off all anti-diabetes medications if safe to do so to assess the percentage of patients with Type 2 Diabetes Mellitus who achieve fasting blood glucose of less than 5.6 mmol/l and/or HbA1c of less than 6%

Secondary Outcome Measures

Name	Time	Method
Percentage of Type 2 Diabetes Mellitus Patients With a Reduction in the Doses/Number of Diabetes Medications Used Preoperatively	1 year after surgery	A list of patients medication will be collected to assess the percentage of Type 2 Diabetes Mellitus patients with a reduction in the doses/number of diabetes medications used preoperatively
Number of Participants With Microvascular Events	1 year after surgery	Composite of microvascular events will be defined as new or worsening nephropathy, retinopathy or neuropathy.