In a 70‑kg adult, how is a basal‑plus insulin regimen (basal insulin glargine or detemir plus rapid‑acting correction insulin) administered, including initial dosing, timing, and dose adjustments?

Basal-Plus Insulin Regimen Administration

A basal-plus regimen for a 70-kg adult consists of a single daily dose of basal insulin (glargine or detemir) at 7-17.5 units (0.1-0.25 U/kg/day), administered subcutaneously at the same time each day, combined with rapid-acting correction insulin given before meals or every 6 hours if fasting. 1

Initial Dosing

Basal Insulin Component:

• Start with 0.1-0.25 U/kg per day of basal insulin (glargine or detemir), which translates to 7-17.5 units daily for a 70-kg patient 1
• Lower doses (0.1 U/kg) are preferred for patients at higher risk of hypoglycemia, including those over 65 years, with renal failure, or poor oral intake 1
• Glargine should be administered once daily at any time but consistently at the same time each day 2
• Detemir can be given once daily with the evening meal or at bedtime; if twice-daily dosing is needed, the evening dose can be given with dinner, at bedtime, or 12 hours after the morning dose 3

Correction Insulin Component:

• Rapid-acting insulin (such as lispro, aspart, or glulisine) is administered only for elevated glucose concentrations 1
• Given before meals if the patient is eating, or every 6 hours if nil by mouth 1

Administration Technique

Injection Sites and Rotation:

• Administer subcutaneously into the abdominal area, thigh, or deltoid 2
• Rotate injection sites within the same region to reduce risk of lipodystrophy and localized cutaneous amyloidosis 2
• Never administer intravenously or via insulin pump 2
• Do not dilute or mix with any other insulin or solution 2

Dose Adjustments

Titration Strategy:

• Adjust basal insulin dose based on fasting blood glucose measurements 2, 4
• Target fasting plasma glucose typically 80-130 mg/dL (4.4-7.2 mmol/L) 4
• Increase basal insulin gradually by 1 unit per day or 2-4 units once or twice per week until fasting glucose consistently reaches target 4
• Correction insulin doses should be adjusted based on pre-meal or every-6-hour glucose readings 1

Monitoring Requirements:

• Increase frequency of blood glucose monitoring during regimen changes 2
• Coordinate meal delivery with nutritional insulin coverage to avoid hyperglycemic and hypoglycemic events 1

Clinical Context and Advantages

Preferred Patient Populations:

• Patients with mild hyperglycemia (blood glucose <200 mg/dL or <11.1 mmol/L) 1
• Those with decreased oral intake 1
• Patients undergoing surgery 1
• Patients who are fasting or expected to undergo procedures 1

Hypoglycemia Risk:

• The basal-plus approach carries lower hypoglycemia risk compared to full basal-bolus regimens 1
• Basal-bolus regimens have 4-6 times higher hypoglycemia risk than sliding scale insulin alone 1
• In controlled settings, mild hypoglycemia occurs in 12-30% with basal-bolus but is lower with basal-plus 1

Important Caveats

When Basal-Plus May Be Insufficient:

• If glucose targets cannot be achieved with reasonable basal doses, transition to full basal-bolus regimen with scheduled prandial insulin 1
• The basal-plus regimen demonstrated similar glycemic control to full basal-bolus in hospitalized patients with type 2 diabetes, with treatment failure rates of 2% versus 0% respectively 5

Special Considerations:

• For patients on home insulin ≥0.6 U/kg/day, reduce total daily dose by 20% during hospitalization to prevent hypoglycemia 1
• In type 1 diabetes, basal insulin must always be continued even if feedings are discontinued, as basal-plus alone is insufficient 1, 2
• Patients without diabetes or those with good metabolic control on oral agents may only require sliding scale correction insulin initially 1