Platelet dynamics in methicillin-susceptible and methicillin-resistant Staphylococcus aureus bacteremia: Distinct...

Area of Science:

• Infectious Diseases
• Hematology
• Critical Care Medicine

Background:

• Staphylococcus aureus bacteremia (SAB) poses significant clinical challenges.
• Platelet dynamics during SAB are not fully understood.
• Distinguishing outcomes between methicillin-susceptible (MSSA) and methicillin-resistant (MRSA) strains is crucial.

Purpose of the Study:

• To investigate platelet count variations in patients with SAB.
• To determine the association between platelet dynamics and clinical outcomes, including mortality and persistent bacteremia.
• To compare these associations between MSSA and MRSA infections.

Main Methods:

• Retrospective analysis of 1,609 SAB episodes (2006-2022).
• Platelet counts were measured at baseline, day 3, and day 7.
• Outcomes included 30-day mortality and persistent bacteremia; multivariable logistic regression was used.

Main Results:

• Mortality showed an inverse dose-response relationship with platelet count in MSSA bacteremia.
• Lower platelet counts (Q1, Q2) were significantly associated with increased mortality in MSSA.
• In MRSA, only the lowest quartile of platelet count was linked to higher mortality; low day 3 platelet counts correlated with persistent bacteremia in both MSSA and MRSA.

Conclusions:

• Platelet count is a significant prognostic marker in SAB.
• An inverse association exists between platelet count and mortality/bacteremia persistence, particularly in MSSA.
• Platelet dynamics monitoring offers valuable insights for SAB patient management.