Myocardial infarction in a population-based cohort of patients with biopsy-confirmed giant cell arteritis in southern...

Area of Science:

• Cardiovascular Medicine
• Rheumatology
• Epidemiology

Background:

• Giant cell arteritis (GCA) is a systemic vasculitis that can affect large arteries, increasing the risk of cardiovascular events.
• Understanding the specific risks of myocardial infarction (MI) in GCA patients is crucial for timely intervention and improved outcomes.

Purpose of the Study:

• To determine the incidence rate (IR) of myocardial infarction (MI) in patients with biopsy-confirmed GCA.
• To assess the relative risk of MI in GCA patients compared to the general population.
• To evaluate the impact of incident MI on mortality among individuals with GCA.

Main Methods:

• A cohort study was conducted using Swedish national registers (SWEDEHEART and regional diagnosis database) from 1998-2016.
• 1134 GCA patients were identified and followed for incident MI. A matched reference cohort was used for comparison.
• Incidence rates, incidence rate ratios (IRR), and hazard ratios (HR) for mortality were calculated.

Main Results:

• The incidence rate of MI in GCA patients was 12.8 per 1000 person-years.
• The incidence of MI was highest within 30 days post-GCA diagnosis.
• GCA patients had a 1.29-fold increased risk of MI compared to the general population, and incident MI significantly increased mortality risk (HR 2.8).

Conclusions:

• The risk of MI is elevated in GCA patients, particularly in the early period following diagnosis.
• GCA patients face a moderately increased risk of MI compared to the general population.
• Incident MI substantially impacts mortality in individuals diagnosed with GCA.