Progression of cardiac allograft vascular disease as assessed by serial intravascular ultrasound: correlation to immunological and non-immunological risk factors

Objective-To characterise the severity and progression of cardiac allograft vascular disease (CAVD) in a large patient cohort, and to evaluate possibl e immunological and nonimmunological risk factors for progression. Design-A prospective observational study using intravascular ultrasound. Setting-Two university hospitals. Patients and main outcome measures-Changes in focal plaque, lumen, and tota l vessel area (worst site method) were assessed at baseline and after 12.1 (2.8) months (mean (SD)) of follow up in a cohort of 96 patients (79 male, 17 female; mean age 48.7 (9.6) years; time post-transplant 26.0 (32.4) mont hs). Results-Overall, the mean (SD) intimal index of worst sites increased by 6. 7 (8.8)%. The increase in the first 12 months was 7.5 (9.4)%, v 5.9 (8.0)% after the first year (NS). Analysing immunological and non-immunological ri sk factors (age, underlying disease, sex, donor age, immunosuppression, cyt omegalovirus, rejection episodes, cholesterol), low density lipoprotein (LD L) cholesterol was found to be the most important predictor of severe progr ession las defined by an increase in intimal index of greater than or equal to 15% (p = 0.01). Conclusions-Progression of CAVD is characterised by a continuing increase i n intimal hyperplasia, especially within the first year after heart transpl antation. LDL cholesterol is an important predictor of major progression.