Prior and new onset anemia in ST-elevation myocardial infarction: a different prognostic role?

Area of Science:

• Cardiology
• Hematology
• Critical Care Medicine

Background:

• Anemia is a common comorbidity in patients with ST-elevation myocardial infarction (STEMI).
• The prognostic implications of pre-existing and newly developed anemia in STEMI patients undergoing primary percutaneous coronary intervention (PCI) require further elucidation.

Purpose of the Study:

• To evaluate the prevalence of prior anemia and its short-term prognostic significance in STEMI patients treated with primary PCI.
• To assess the prevalence of new-onset anemia and its impact on short-term outcomes in this patient cohort.

Main Methods:

• Retrospective analysis of 1,122 consecutive STEMI patients treated with primary PCI.
• Assessment of prior anemia status and development of new anemia during hospitalization.
• Evaluation of short-term outcomes including intra-hospital mortality, PCI failure, and major bleeding events.

Main Results:

• The prevalence of prior anemia was 27.4%, associated with older age, more comorbidities, and higher rates of mortality, PCI failure, and major bleeding.
• Prior anemia independently predicted intra-hospital mortality (OR 2.12).
• New anemia developed in 46.8% of patients, correlating with increased early mortality and major bleeding compared to those with normal hemoglobin levels.

Conclusions:

• Prior anemia identifies a high-risk subgroup of STEMI patients with advanced age, comorbidities, and severe coronary artery disease, facing elevated risks of mortality and complications.
• Anemia developing during intensive cardiac care unit (ICCU) stay is frequent and associated with poorer outcomes, underscoring the importance of monitoring hemoglobin levels.