Amyloid Angiopathy in Brain Hemorrhage: A Postmortem Neuropathological-Magnetic Resonance Imaging Study

Area of Science:

• Neurology
• Pathology
• Radiology

Background:

• Intracerebral hemorrhage (ICH) is often linked to hypertension and cerebral amyloid angiopathy (CAA).
• Understanding the prevalence and overlap of these risk factors in ICH is crucial.
• Investigating the association between CAA and cerebral microbleeds is important for patient outcomes.

Purpose of the Study:

• To determine the autopsy prevalence of CAA in patients who died from ICH.
• To assess the overlap between CAA, hypertension, and other risk factors in ICH patients.
• To correlate CAA with the presence of cerebral microbleeds.

Main Methods:

• Analysis of 81 consecutive autopsy brains from ICH patients.
• Staining for CAA detection and comparison with age/sex-matched controls.
• Postmortem MRI and histological analysis of microbleeds in 11 ICH brains.

Main Results:

• Hypertension and CAA were present in 69.1% and 24.7% of ICH cases, respectively.
• CAA prevalence was similar in non-hypertensive ICH cases and controls, but higher in hypertensive cases versus controls.
• MRI detected 48 microbleeds, with all 5 CAA-positive brains having microbleeds, compared to 3/6 CAA-negative brains.

Conclusions:

• Hypertension and CAA frequently coexist in intracerebral hemorrhage.
• MRI-detected microbleeds, confirmed histologically, were twice as common in patients with CAA compared to those with hypertensive ICH.