In a 78‑year‑old patient with type 1 diabetes presenting with chills, no fever, and stable blood glucose, what evaluation and management are recommended?

Evaluation and Management of Chills Without Fever in a 78-Year-Old with Type 1 Diabetes

In a 78-year-old with type 1 diabetes presenting with chills but no fever and stable glucose, immediately check for hypoglycemia (even if glucose appears stable), assess for infection despite absence of fever, and evaluate for diabetic ketoacidosis (DKA).

Immediate Assessment

Check Blood Glucose and Ketones

Even though glucose is reported as "stable," verify the actual value and check for ketones (blood or urine). Older adults with type 1 diabetes can develop DKA during acute illness, and chills may represent an early manifestation of metabolic decompensation 1. During acute illness, individuals with type 1 diabetes must continue insulin and often require supplemental doses 1.

Rule Out Occult Infection

Older adults frequently present atypically with infections—absence of fever does not exclude serious infection in this age group. The chills may represent:

• Urinary tract infection (common in older adults with diabetes)
• Respiratory infection
• Skin/soft tissue infection
• Other occult bacterial infection

Obtain:

• Complete blood count with differential
• Urinalysis and culture
• Chest examination/imaging if respiratory symptoms
• Blood cultures if patient appears ill

Assess for Hypoglycemia

Despite "stable" glucose readings, verify timing of last measurement. Older adults with type 1 diabetes have higher rates of hypoglycemia unawareness 2, 3. Chills can be an atypical presentation of hypoglycemia in this population 4. If glucose is <70 mg/dL, treat immediately with 15-20 g of glucose 1.

Management During Acute Illness

Insulin Management

Never discontinue insulin in type 1 diabetes, even during illness 1. This is critical to prevent DKA. The patient likely needs:

• Continuation of basal insulin at minimum
• Possible supplemental rapid-acting insulin if glucose rises
• More frequent glucose monitoring (every 2-4 hours)

Hydration and Nutrition

Ensure adequate fluid intake to prevent dehydration 1. Provide:

• 150-200 g carbohydrate daily (45-50 g every 3-4 hours) to prevent starvation ketosis
• Sodium-containing fluids (broth, tomato juice, sports drinks) for volume replacement
• If unable to tolerate regular food, use liquid carbohydrates (juice, sugar-sweetened beverages, ice cream)

If nausea, vomiting, or altered mental status prevents oral intake, immediate medical consultation or emergency evaluation is required 1.

Special Considerations for This Age Group

Cognitive Assessment

At 78 years, screen for cognitive impairment that may affect diabetes self-management 2, 3. Cognitive decline increases hypoglycemia risk and may impair the patient's ability to recognize and treat symptoms 2.

Consider Continuous Glucose Monitoring

For older adults with type 1 diabetes, CGM significantly reduces hypoglycemia risk (reducing time <70 mg/dL by approximately 27 minutes per day) 2, 3, 5. This is particularly valuable in those with hypoglycemia unawareness or cognitive impairment.

Red Flags Requiring Immediate Evaluation

• Ketones present (blood or urine)
• Glucose >250 mg/dL with ketones
• Persistent vomiting preventing oral intake
• Altered mental status or confusion
• Signs of dehydration (orthostatic hypotension, decreased urine output)
• Respiratory distress

Common Pitfalls to Avoid

1. Assuming "stable glucose" means no metabolic problem—verify actual values and trends
2. Stopping insulin during illness—this precipitates DKA in type 1 diabetes 1
3. Dismissing infection due to absence of fever—older adults often lack typical fever response
4. Overlooking hypoglycemia unawareness—older adults with long-standing type 1 diabetes frequently lose warning symptoms 2, 4

Follow-Up Actions

• Recheck glucose in 1 hour after any intervention
• Monitor ketones if glucose >250 mg/dL or patient feels unwell
• Increase glucose monitoring frequency to every 2-4 hours during illness
• Ensure patient/caregiver can recognize and treat hypoglycemia
• Consider CGM if not already in use 2, 3