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(Circulation. 1997;95:855-859.)
© 1997 American Heart Association, Inc.
Articles |
Role of Compensatory Enlargement and Shrinkage in Transplant Coronary Artery Disease
Serial Intravascular Ultrasound Study
the Division of Cardiovascular Medicine, Stanford (Calif) University School of Medicine.
Correspondence to Alan C. Yeung, MD, Division of Cardiovascular Medicine, Stanford University Medical Center, 300 Pasteur Dr, Stanford CA 94305.
Background Compensatory enlargement of the vessel wall has been described in the early stages of native atherosclerosis. Whether compensatory enlargement plays a role in transplant coronary artery disease is not known. The objective of this study was to determine, by use of serial intravascular ultrasound (IVUS), whether compensatory dilation occurs in transplant coronary artery disease over time.
Methods and Results Seventy-five heart transplant recipients with 151 matched coronary segments were selected for the presence of intimal disease progression as detected by serial IVUS examinations 1 to 3 years apart. Intimal disease progression was defined as a >10% increase in intimal area (IA). IVUS catheter location in follow-up studies was verified angiographically in relation to branch vessels. Luminal area (LA) and total vessel area (TA) were measured at each site. Intimal area (IA=TA-LA) was calculated. Changes in IA (
IA) and TA (TA) between baseline and follow-up IVUS were compared: IA, 2.9±0.2 mm2; TA, 2.7±0.4 mm2. A remodeling index (RI) was defined as RI=TA/IA. Three subgroups could be distinguished: overcompensation (RI >1), partial compensation (RI 0 to 1), and no compensation or shrinkage (RI 
0). Seventy-four segments (49%) showed overcompensation, 44 (29%) showed partial compensation, and 33 (22%) showed no compensation or shrinkage.
Conclusions In this study, serial IVUS shows that early after cardiac transplantation, a large proportion of the coronary segments with progression of intimal thickening have compensatory dilation of the vessel wall. However, a substantial number of coronary segments (22%) show no compensatory dilation or shrinkage. The progressive luminal narrowing in transplant patients may be due in part to vessel shrinkage or the lack of compensatory dilation over time.
Key Words: coronary disease • remodeling • transplantation • ultrasonics
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