Atherosclerotic plaque in HIV-positive patients presenting with acute coronary syndromes.

Aim: This study aimed to characterise the atherosclerotic plaque and plaque burden in HIV-positive patients presenting with acute coronary syndromes (ACS), using intravascular ultrasound (IVUS) and virtual histology (VH).

Methods: This was a prospective study of 20 HIV-positive patients who presented with ACS. IVUS and VH were used to assess plaque burden and plaque characteristics in the culprit and non-culprit coronary arteries.

Results: HIV-positive patients with ACS had a mean age of 51.1 ± 8.1 years. There were 13 (65%) male patients. ST-segment elevation myocardial infarction was the most common presentation of ACS (75%) with the left anterior descending artery being the most common culprit artery (60%). In 60% of patients, the total plaque burden was of moderate degree (40-70% stenosis) while it was of mild degree (< 40% stenosis) in 35%, and in 5% of patients it was severe (> 70% stenosis). A severe degree of total plaque burden was more commonly found in the culprit vessel (30%) than in the non-culprit vessels (5%). Furthermore, the plaque burden was found to be located predominantly in the proximal portion of the coronary arteries. The predominant plaque morphology consisted of fibrous plaque (55.4%) and fibro-fatty plaque (26.6%), while necrotic core was present in 13.3%. Dense calcium was present in only 4.7% of the cohort.

Conclusions: IVUS and VH demonstrated a high burden of atherosclerosis in the left anterior descending artery and proximal vasculature of HIV-positive patients. The atherosclerotic plaque predominantly comprised non-calcified fibrous and fibro-fatty plaque.