Glycemic Control for Tooth Extraction in Diabetes

Preoperative Evaluation and Management

• The American Diabetes Association recommends targeting a fasting blood glucose <180 mg/dL or HbA1c <8% for elective tooth extractions in patients with uncontrolled diabetes, whenever possible 1, 2
• For emergency extractions in patients with uncontrolled diabetes, the American Diabetes Association suggests proceeding with prophylactic antibiotics when fasting glucose exceeds 250 mg/dL 1
• The target for elective surgery is HbA1c <8% whenever possible, as recommended by the American Diabetes Association 1, 2

Intraoperative Management

• The American Diabetes Association recommends monitoring blood glucose every 2-4 hours while the patient is NPO, with a target range of 100-180 mg/dL (5.6-10.0 mmol/L) 1, 2
• Dose short- or rapid-acting insulin as needed to maintain the target blood glucose range, as recommended by the American Diabetes Association 1, 2

Perioperative Medication Management

• The American Diabetes Association recommends holding metformin on the day of surgery 1, 2
• SGLT2 inhibitors should be discontinued 3-4 days before surgery to prevent euglycemic ketoacidosis, as recommended by the American Diabetes Association 1, 2
• Other oral hypoglycemic agents should be held on the morning of surgery, as recommended by the American Diabetes Association 1, 2
• NPH insulin should be given at 50% of the usual dose, and long-acting analogs should be given at 75-80% of the usual dose, as recommended by the American Diabetes Association 1, 2

Postoperative Management

• The American Diabetes Association recommends resuming oral feeding as soon as possible after surgery 3, 4
• Blood glucose monitoring should be continued until the patient is stable, as recommended by the American Diabetes Association 3, 4
• Regular diabetes medications should be resumed when blood glucose is 90-180 mg/dL and the patient is eating, as recommended by the American Diabetes Association 3, 4
• If blood glucose exceeds 180 mg/dL postoperatively, corrective subcutaneous insulin boluses should be administered, as recommended by the American Diabetes Association 3, 4
• If blood glucose exceeds 300 mg/dL (16.5 mmol/L), hospitalization may be required for IV insulin therapy, as recommended by the American Diabetes Association 3, 4

Management of Diabetic Patients in Dental Care

Local Anesthesia Selection

• For well-controlled diabetics, the American Diabetes Association recommends proceeding with standard epinephrine-containing local anesthetics, as they are safe when patients are on their regular medications 5

Analgesia Management

• Standard analgesics, such as NSAIDs, acetaminophen, and opioids, can be used without modification in diabetic patients, as they do not affect glycemic control, according to the American Society of Anesthesiologists 6
• Effective pain control is particularly important in diabetic patients because poorly controlled pain is a risk factor for hyperglycemia, as stated by the American Pain Society 7
• The American Society of Anesthesiologists advises avoiding dexamethasone doses >4 mg if antiemetic prophylaxis is needed, as higher doses significantly increase hyperglycemia risk for 24 hours postoperatively 6

Antibiotic Prophylaxis

• The American Heart Association recommends using prophylactic antibiotics only in situations where they would be indicated for non-diabetic patients, such as prosthetic joints or certain cardiac conditions 5
• For poorly controlled diabetics with fasting glucose >250 mg/dL requiring emergency dental surgery, prophylactic antibiotics are prudent, according to the American Dental Association 5

Perioperative Glycemic Management

• The American Diabetes Association suggests measuring capillary blood glucose on arrival, with a target range of 5-10 mmol/L, and administering ultra-rapid insulin analogue bolus if blood glucose >10 mmol/L 8
• The Endocrine Society recommends monitoring blood glucose hourly during lengthy procedures and scheduling diabetic patients early on the surgical list to minimize disruption to their medication and meal routine 8
• If the patient can eat within 2-3 hours post-procedure, they may take their usual morning diabetes medication with a light breakfast before the appointment, as advised by the American Association of Clinical Endocrinologists 8

Postoperative Care

• The American Society of Anesthesiologists recommends resuming oral feeding as soon as possible and continuing blood glucose monitoring until stable 8
• The American Diabetes Association advises resuming regular diabetes medications when blood glucose is 5-10 mmol/L and the patient is eating 8

Ambulatory Peri‑operative Management of Oral Antidiabetic Agents (Evidence from Anaesthesia 2018)

Eligibility for Continuing Oral Agents in Outpatient Surgery

• Patients who are expected to miss only a single meal and can resume oral intake within 2–3 hours after the procedure may safely continue their usual oral antidiabetic medications, resulting in better intra‑operative glucose control (mean ≈ 138 mg/dL vs ≈ 156 mg/dL when discontinued)【9】.

Timing of Medication Relative to Discharge

• If the patient is expected to leave the recovery area before 10:00 AM, breakfast should be offered immediately and the morning dose of oral antidiabetic medication administered at that time【9】.
• When discharge is planned between 10:00 AM and 12:00 PM, the patient should take the usual oral antidiabetic dose upon arrival at the hospital, supplemented with a glucose infusion (10 % dextrose, ≈ 40 mL/h) until the next solid meal is tolerated【9】.

Post‑operative Glucose Management

• If postoperative capillary glucose rises above 180 mg/dL, a corrective sub‑cutaneous insulin bolus should be given and glucose re‑checked until values fall within the target range of 90–180 mg/dL【9】.

Scheduling Considerations for Diabetic Patients

• Diabetic patients should be placed early on the surgical list to minimize interruptions to their medication and meal schedule, thereby reducing missed meals and simplifying peri‑operative glycaemic management【9】.

Perioperative Management of Glipizide

Timing of Discontinuation

• Hold glipizide on the morning of surgery; only a day‑of‑surgery hold is needed, unlike SGLT2 inhibitors that require 3–4 days of pre‑operative discontinuation. 10

Perioperative Glucose Monitoring

• Check capillary blood glucose at least every 2–4 hours while the patient is NPO, targeting a range of 100–180 mg/dL (5.6–10.0 mmol/L); tighter targets increase hypoglycemia risk without improving outcomes. 10
• If glucose exceeds 180 mg/dL, give a corrective subcutaneous bolus of short‑ or rapid‑acting insulin. 10

Management of Concomitant Basal Insulin

• On the morning of surgery, administer 75–80 % of the usual long‑acting insulin analog dose (or 50 % of an NPH dose) for patients also receiving basal insulin. 10
• Reduce basal insulin on the morning of surgery (rather than only the evening before) to improve peri‑operative glucose control and lower hypoglycemia risk while glipizide is held. 10
• Continue to hold glipizide on the morning of surgery even when basal insulin is continued. 10

Risk of Impaired Hypoglycemia Awareness

• Up to 40 % of patients with Type 1 diabetes and 10 % of those with Type 2 diabetes on insulin or sulfonylureas have impaired awareness of hypoglycemia, underscoring the need for objective glucose monitoring. 11

Common Pitfalls to Avoid

• Do not apply SGLT2‑inhibitor discontinuation protocols to glipizide; glipizide requires only a day‑of‑surgery hold. 10
• Do not fail to reduce basal insulin doses when glipizide is held, as full basal insulin dosing increases hypoglycemia risk during the NPO period. 10