Published in:
Open Access
01-12-2015 | Research
Arterial spin labeling perfusion cardiovascular magnetic resonance of the calf in peripheral arterial disease: cuff occlusion hyperemia vs exercise
Authors:
David Lopez, Amy W Pollak, Craig H Meyer, Frederick H Epstein, Li Zhao, Arthur J Pesch, Ronny Jiji, Jennifer R Kay, Joseph M DiMaria, John M Christopher, Christopher M Kramer
Published in:
Journal of Cardiovascular Magnetic Resonance
|
Issue 1/2015
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Abstract
Background
Assessment of calf muscle perfusion requires a physiological challenge. Exercise and cuff-occlusion hyperemia are commonly used methods, but it has been unclear if one is superior to the other. We hypothesized that post-occlusion calf muscle perfusion (Cuff) with pulsed arterial spin labeling (PASL) cardiovascular magnetic resonance (CMR) at 3 Tesla (T) would yield greater perfusion and improved reproducibility compared to exercise hyperemia in studies of peripheral arterial disease (PAD).
Methods
Exercise and Cuff cohorts were independently recruited. PAD patients had an ankle brachial index (ABI) between 0.4-0.9. Controls (NL) had no risk factors and ABI 0.9-1.4. Subjects exercised until exhaustion (15 NL-Ex, 15 PAD-Ex) or had a thigh cuff inflated for 5 minutes (12 NL-Cuff, 11 PAD-Cuff). Peak exercise and average cuff (Cuff
mean
) perfusion were compared. Six participants underwent both cuff and exercise testing. Reproducibility was tested in 8 Cuff subjects (5 NL, 3 PAD).
Results
Controls had greater perfusion than PAD independent of stressor (NL-Ex 74 ± 21 vs. PAD-Ex 43 ± 10, p = 0.01; NL-Cuff
mean
109 ± 39 vs. PAD-Cuff
mean
34 ± 17 ml/min-100 g, p < 0.001). However, there was no difference between exercise and Cuff
mean
perfusion within groups (p > 0.6). Results were similar when the same subjects had the 2 stressors performed. Cuff
mean
had superior reproducibility (Cuff
mean
ICC 0.98 vs. Exercise ICC 0.87) and area under the receiver operating characteristic curve (Cuff
mean
0.992 vs. Exercise 0.905).
Conclusions
Cuff hyperemia differentiates PAD patients from controls, as does exercise stress. Cuff
mean
and exercise calf perfusion values are similar. Cuff occlusion hyperemia has superior reproducibility and thus may be the preferred stressor.