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Difficulty: MediumMonitoring and Treatment Evaluation

A 6262-year-old man with a 1010-year history of type 2 diabetes mellitus returns to the clinic for a routine follow-up. His current medication regimen includes maximum tolerated doses of metformin, empagliflozin, and a glucagon-like peptide-1 (GLP-1) receptor agonist. His hemoglobin A1c today is 9.5%9.5\%, and his home fasting blood glucose levels consistently range between 180180 and 220 mg/dL220\text{ mg/dL}. The physician and patient agree that initiating insulin therapy is the most appropriate next step. Arrange the following steps in the correct chronological sequence for intensifying and monitoring this patient's insulin therapy over the coming months according to standard diabetes care guidelines.

  1. 1Initiate a once-daily basal insulin injection
  2. 2Titrate the basal insulin dose progressively based on fasting blood glucose monitoring
  3. 3Assess postprandial blood glucose levels if the overall HbA1c target remains unmet
  4. 4Add a single injection of rapid-acting prandial insulin before the largest meal of the day

Answer

The correct sequence is: (1) Initiate a once-daily basal insulin injection, (2) Titrate the basal insulin dose based on fasting blood glucose monitoring, (3) Assess postprandial blood glucose levels if HbA1c remains unmet, and (4) Add a single injection of rapid-acting prandial insulin before the largest meal.
The American Diabetes Association (ADA) recommends a stepwise approach to insulin intensification in type 2 diabetes. When oral agents and GLP-1 receptor agonists are insufficient, the first step is to initiate basal insulin. The basal dose is then systematically titrated based on fasting blood glucose readings until the fasting target is achieved. If the fasting target is met but the hemoglobin A1c remains above the individualized goal, this indicates that postprandial excursions are driving the persistent hyperglycemia. Therefore, the next step in treatment evaluation is to monitor postprandial blood glucose levels. Once postprandial hyperglycemia is confirmed, the treatment is further intensified by adding a dose of rapid-acting prandial insulin, usually starting with the largest or most carbohydrate-heavy meal of the day.

Step-by-Step Solution

1
Address the high fasting blood glucose.
Initiate basal insulin.
Basal insulin targets fasting hyperglycemia, which is the primary driver of HbA1c elevation in this range.
2
Evaluate and optimize the initial therapy.
Titrate basal insulin.
The initial basal dose must be adjusted upward until the fasting blood glucose reaches the therapeutic target (typically 8080 to 130 mg/dL130\text{ mg/dL}).
3
Investigate persistent overall hyperglycemia (elevated HbA1c) despite achieving fasting targets.
Measure postprandial blood glucose.
If fasting levels are normal but HbA1c is high, postprandial excursions are the likely cause and must be documented.
4
Intensify therapy to address postprandial excursions.
Add rapid-acting prandial insulin.
A single dose of prandial insulin before the largest meal directly mitigates the identified postprandial hyperglycemia, completing the stepwise approach.

Key Concept

The stepwise approach to initiating, monitoring, and intensifying insulin therapy in type 2 diabetes mellitus.
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Topics

Monitoring and Treatment Evaluation

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