Type 2 Diabetes Mellitus Clinical Case Quiz | Polyuria, Polydipsia & Hyperglycemia MCQ

📋 HISTORY

• 32-year-old woman
• Excessive thirst (Polydipsia) – 2 months
• Frequent urination (Polyuria) – 2 months
• Unintentional weight loss – 2 months
• Father is a known diabetic

🩺 EXAMINATION

• BMI: 32 kg/m² (Obese)

🔬 INVESTIGATIONS

• Random Blood Glucose: 210 mg/dL
• Diagnostic threshold ≥200 mg/dL with classic symptoms

❓ MCQ QUESTIONS

Q1. Most likely diagnosis?

A) Type 1 DM
B) Type 2 DM
C) Diabetes Insipidus
D) MODY

Q2. Which diagnostic criterion is satisfied?

A) Fasting glucose ≥126 mg/dL
B) Random glucose ≥200 mg/dL with classic symptoms
C) 2-hour OGTT ≥200 mg/dL
D) HbA1c ≥6.5%

Q3. Most appropriate next investigation?

A) C-peptide
B) HbA1c
C) Urine ketones
D) Anti-GAD antibodies

Q4. First-line management?

A) Insulin therapy
B) Lifestyle modification ± Metformin
C) Sulfonylureas
D) SGLT2 inhibitor alone

📖 Brief Case Summary

32-year-old obese woman presents with classic osmotic symptoms (polyuria, polydipsia), weight loss, positive family history, and random blood glucose of 210 mg/dL.

✅ Click Here for Answers> Q1. B) Type 2 Diabetes Mellitus
Q2. B) Random glucose ≥200 mg/dL with classic symptoms
Q3. B) HbA1c
Q4. B) Lifestyle modification (diet and exercise) ± Metformin

🧠 Answer Explanation

The patient has classic symptoms of diabetes mellitus along with obesity, family history, and random blood glucose above 200 mg/dL. These findings strongly support Type 2 Diabetes Mellitus. HbA1c is useful for confirmation and assessment of chronic glycemic status. Initial management includes lifestyle modification and metformin unless contraindicated.

❌ Why Not Others?

• Type 1 DM: Usually younger, lean patients, often ketosis-prone.
• Diabetes Insipidus: Polyuria and polydipsia without hyperglycemia.
• MODY: Strong autosomal dominant inheritance, usually younger onset and non-obese.
• C-peptide/Anti-GAD: Reserved when diabetes type is uncertain.

📝 5 Brief Case Scenarios

• Obese patient with polyuria and HbA1c 8.2%.
• Middle-aged woman with blurred vision and hyperglycemia.
• Overweight male with recurrent skin infections.
• Prediabetic patient progressing to symptomatic diabetes.
• Family history of diabetes with elevated fasting glucose.

⚙️ Simplified Pathophysiology

Insulin resistance develops in muscle, liver, and fat tissue. The pancreas initially compensates by producing more insulin, but eventually beta-cell dysfunction occurs, causing persistent hyperglycemia.

🩺 Physical Examination Pearls

• Measure BMI and waist circumference.
• Check blood pressure.
• Look for acanthosis nigricans.
• Assess feet for neuropathy.
• Screen for diabetic complications.

🔬 Investigation Findings

• Random glucose ≥200 mg/dL with symptoms
• HbA1c ≥6.5%
• Fasting plasma glucose ≥126 mg/dL
• 2-hour OGTT ≥200 mg/dL
• Possible dyslipidemia

⚠️ Complications

• Retinopathy
• Nephropathy
• Neuropathy
• Coronary artery disease
• Stroke
• Peripheral arterial disease

💊 Management

• Dietary modification
• Regular exercise
• Weight reduction
• Metformin as first-line drug
• Control blood pressure and lipids
• Routine screening for complications

🔍 Differential Diagnosis

• Type 1 Diabetes Mellitus
• MODY
• Diabetes Insipidus
• Cushing Syndrome
• Steroid-induced diabetes

🚨 Clinical Pitfalls

• Ignoring obesity as a major risk factor.
• Missing diagnosis in symptomatic patients.
• Delaying lifestyle intervention.
• Not screening for complications.
• Relying on a single test without clinical correlation.

💡 Clinical Pearls

• Classic symptoms + RBG ≥200 mg/dL can diagnose diabetes.
• Obesity strongly predicts Type 2 DM.
• Weight loss may occur despite obesity.
• HbA1c reflects previous 3 months glycemic control.
• Lifestyle intervention remains essential.

📅 Monitoring & Follow-Up

• HbA1c every 3–6 months
• Annual eye examination
• Annual urine albumin screening
• Foot examination at each visit
• Monitor blood pressure and lipids

📈 Prognosis

Good if diagnosed early and treated appropriately. Poor glycemic control increases risk of microvascular and macrovascular complications.

❓ FAQ

1. What is Type 2 DM?
A metabolic disorder characterized by insulin resistance.

2. What causes polyuria?
Osmotic diuresis due to hyperglycemia.

3. What causes polydipsia?
Excessive water loss triggers thirst.

4. Is obesity a risk factor?
Yes, a major risk factor.

5. Why does weight loss occur?
Cells cannot utilize glucose effectively.

6. What is HbA1c?
Average blood glucose over 3 months.

7. What is the diagnostic HbA1c cutoff?
≥6.5%.

8. Can diabetes be asymptomatic?
Yes.

9. What is first-line medication?
Metformin.

10. Is exercise important?
Yes, improves insulin sensitivity.

11. What eye complication occurs?
Diabetic retinopathy.

12. What kidney complication occurs?
Diabetic nephropathy.

13. What nerve complication occurs?
Peripheral neuropathy.

14. Can Type 2 DM be prevented?
Often through healthy lifestyle.

15. What is the long-term goal?
Prevent complications and maintain glycemic control.

📚 References

• ADA Standards of Care in Diabetes
• Harrison's Principles of Internal Medicine
• Oxford Handbook of Endocrinology
• WHO Diabetes Guidelines
• NICE Diabetes Management Guidelines

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