How should I evaluate and manage a patient presenting with ongoing chills?

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Evaluation and Management of Ongoing Chills

For patients presenting with ongoing chills, immediately obtain blood cultures and initiate empiric antibiotics, as shaking chills are highly specific (87%) for bacteremia with a positive likelihood ratio of 4.65, though their absence does not exclude infection.

Initial Risk Stratification

The presence and severity of chills directly correlates with bacteremia risk 1:

  • Shaking chills (whole-body shaking even under thick blanket): 12.1-fold increased risk of bacteremia
  • Moderate chills (requiring thick blanket): 4.1-fold increased risk
  • Mild chills (cold feeling, needing jacket): 1.8-fold increased risk

Shaking chills have 90% specificity for bacteremia 1, meaning when present, you should strongly suspect bloodstream infection. However, sensitivity is only 37% 2, so absence of chills does NOT rule out bacteremia - 87.5% of bacteremic patients may lack chills 1.

Immediate Actions

1. Blood Culture Collection

Obtain at least one set (preferably two sets from separate sites) before antibiotics 2, 3. The positive predictive value of shaking chills for bacteremia is 31-34% 2, 4.

2. Identify High-Risk Features

Additional factors that increase bacteremia likelihood 3, 5:

  • Fever (OR 1.6)
  • Vascular catheter access (OR 6.2) - particularly in dialysis patients
  • Leukocytosis (OR 1.3 for any infection)
  • Hypoalbuminemia
  • Abnormal vital signs (tachycardia, tachypnea, hypotension, altered mental status, hypoxia)

3. Source Identification

Perform chest radiograph for all patients with fever/chills during evaluation 6. This is a best-practice statement from 2023 ICU fever guidelines.

Focus on common sources:

  • Urinary tract infections: 48% positive predictive value for bacteremia when chills present 4
  • Respiratory tract infections: 24% positive predictive value 4
  • Most infections are pulmonary (42%) or urogenital (15%) in origin 4

For post-surgical patients: If initial workup unrevealing, obtain CT of thorax/abdomen/pelvis in collaboration with surgical service 6.

For abdominal concerns:

  • If recent abdominal surgery OR abdominal symptoms/signs OR abnormal liver enzymes: perform formal bedside ultrasound 6
  • WITHOUT these features: do NOT routinely perform abdominal ultrasound 6

Antibiotic Decision Algorithm

Initiate Empiric Antibiotics Immediately If:

  • Shaking chills present
  • Fever + vascular catheter
  • Any abnormal vital signs
  • Leukocytosis or hypoalbuminemia
  • Obvious infection source identified

Consider Delaying Antibiotics ONLY If ALL of the Following:

  • No shaking chills
  • No fever
  • No leukocytosis
  • No hypoalbuminemia
  • No vascular catheter
  • No obvious infection source
  • Fistula or graft access (dialysis patients only)

This very narrow subset has only 6% bacteremia risk 5, but this applies primarily to hemodialysis patients - for general populations, err on the side of treatment.

Critical Pitfalls to Avoid

  1. Do NOT withhold antibiotics based on absence of chills alone - 66% of bacteremic patients lack shaking chills 2

  2. Do NOT assume vomiting predicts bacteremia - unlike chills, vomiting shows no association with bacteremia 3

  3. Do NOT delay blood cultures to obtain imaging - cultures first, then imaging

  4. Do NOT use unreliable temperature methods - avoid axillary, tympanic, temporal artery, or chemical dot thermometers; use oral/rectal or central methods (bladder, esophageal, PA catheter) 6

Prognostic Considerations

Mortality risk increases with 4:

  • Bacteremia (RR 1.1)
  • Advanced age
  • Serious comorbidity (RR 6.1)

Median admission for bacteremic patients is 11 days 4, emphasizing the severity of these infections.

References

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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