Risk factors for long-term mortality of Staphylococcus aureus bacteremia

Area of Science:

• Infectious Diseases
• Epidemiology
• Clinical Medicine

Background:

• Staphylococcus aureus bacteremia (SAB) is a severe, often fatal bloodstream infection.
• Understanding long-term mortality risk factors is crucial for patient management and outcomes.

Purpose of the Study:

• To identify independent predictors of long-term mortality in patients with Staphylococcus aureus bacteremia.
• To analyze survival data up to 22 years post-diagnosis.

Main Methods:

• Retrospective analysis of a database containing 1,692 patients diagnosed with SAB.
• Kaplan-Meier survival analysis to assess long-term survival.
• Cox regression modeling to identify independent predictors of mortality.

Main Results:

• Within one year, 62% of SAB patients died; within five years, 72% died.
• Independent mortality predictors included older age, female gender, pneumonia/unknown source, dementia, higher Charlson score, shock at onset, and institutionalized origin.
• Patients aged 65+ and women experienced significantly reduced long-term survival.

Conclusions:

• Long-term mortality after SAB is substantial, with specific demographic and clinical factors conferring higher risk.
• Older age, female sex, certain infection sources, comorbidities like dementia, and critical illness indicators (shock) are associated with poorer prognosis.
• These findings highlight vulnerable populations and risk factors requiring targeted interventions for improved SAB patient outcomes.