Abstract
Objectives: We present the novel application of continuous arterial spin-labeling (CASL) magnetic resonance imaging (MRI) for the measurement of calf muscle perfusion in subjects with progressive peripheral arterial disease (PAD). Background: Peripheral arterial disease is largely considered to be a disease of conduit vessels. The impact of PAD upon microvascular flow in the end-organ, muscle, remains unknown. Continuous arterial spin-labeling is a noninvasive MRI method capable of measuring microvascular flow and might assist in our understanding of the impact of PAD upon the microvasculature. Methods: Forty subjects with varying degrees of PAD and 17 age-matched PAD-free subjects were recruited and underwent measurement of the ankle-to-brachial index (ABI) and CASL. Peak hyperemic flow (PHF) and time-to-peak (TTP) were computed and assessed as a function of ABI and calf muscle group. Results: An ABI dependence was found in both PHF (p = 0.04) and TTP (p < 10-4). Whereas TTP increased almost immediately with increasing PAD severity, PHF was, in contrast, relatively well preserved until later stages of disease. Conclusions: The CASL flow measurements correlate with disease state as measured by ABI and demonstrate preserved microvascular flow reserve in the presence of early to intermediate vascular disease.
Original language | English (US) |
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Pages (from-to) | 2372-2377 |
Number of pages | 6 |
Journal | Journal of the American College of Cardiology |
Volume | 53 |
Issue number | 25 |
DOIs | |
State | Published - Jun 23 2009 |
Keywords
- arterial spin-labeling
- magnetic resonance imaging
- peripheral arterial disease
- skeletal muscle
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine