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Type 2 Diabetes (Formerly NIDDM): Pathophysiology, Diagnosis, and Modern Management

Non-Insulin-Dependent Diabetes Mellitus (NIDDM) is the obsolete term for Type 2 Diabetes Mellitus (T2DM). The classification shifted in 1997 (ADA/WHO) to etiologic categories because many T2DM patients eventually require insulin, making "non-insulin-dependent" misleading.

Pathophysiology (The "Ominous Octet")

  1. ↓ Insulin secretion (β-cell dysfunction)
  2. ↑ Glucagon secretion (α-cell dysregulation)
  3. ↑ Hepatic glucose production
  4. ↓ Muscle glucose uptake (insulin resistance)
  5. ↑ Adipose tissue lipolysis → FFA flux
  6. ↓ Incretin effect (GLP-1, GIP resistance)
  7. ↑ Renal glucose reabsorption (SGLT2)
  8. Neurotransmitter dysregulation (central)

Diagnostic Criteria (ADA 2024)

TestNormalPrediabetesDiabetes
Fasting Plasma Glucose<100 mg/dL100–125≥126
HbA1c<5.7%5.7–6.4%≥6.5%
2-h OGTT<140140–199≥200
Random PG + symptoms——≥200

Modern Pharmacotherapy (ADA/EASD 2023 Algorithm)

  • First-line: Metformin + comprehensive lifestyle (unless contraindicated).
  • ASCVD/HF/CKD: Add GLP-1 RA or SGLT2i with proven CV/renal benefit regardless of HbA1c.
  • Need greater HbA1c reduction: Add GLP-1 RA (high efficacy) or dual/triple GIP/GLP-1 (tirzepatide).
  • Cost/access barriers: Sulfonylurea, TZD, basal insulin.
  • Insulin initiation: Basal → basal-bolus → concentrated insulins + GLP-1 RA (fixed-ratio combos).

Remission

Defined as HbA1c <6.5% off glucose-lowering meds for ≥3 months. Achievable with intensive lifestyle (DiRECT trial), bariatric surgery, or very-low-calorie diets—especially early in diagnosis (<6 yr).

Key Message

T2DM is a progressive, heterogeneous cardiometabolic disorder. Early, aggressive, personalized therapy targeting multiple pathophysiologic defects reduces complications and can induce remission.

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