Törngren Kristina, Eriksson Stefanie, Arvidsson Jonathan, Falkenberg Mårten, Johnsson Åse A, Sjöberg Carl, Lagerstrand Kerstin, Nordanstig Joakim
Department of Molecular and Clinical Medicine, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, 413 90 Gothenburg, Sweden.
Department of Medical Radiation Sciences, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, 413 90 Gothenburg, Sweden.
J Clin Med. 2021 Aug 18;10(16):3643. doi: 10.3390/jcm10163643.
There is no established technique that directly quantifies lower limb tissue perfusion. Blood oxygenation level-dependent magnetic resonance imaging (BOLD-MRI) is an MRI technique that can determine skeletal muscle perfusion. BOLD-MRI relies on magnetic differences of oxygenated and deoxygenated hemoglobin, and regional changes in oxy/deoxyhemoglobin ratio can be recorded by T2* weighted MRI sequences. We aimed to test whether BOLD-MRI can differentiate lower limb tissue perfusion in peripheral arterial occlusive disease (PAOD) patients and healthy controls. Twenty-two PAOD patients and ten healthy elderly volunteers underwent lower limb BOLD-MRI. Reactive hyperemia was provoked by transient cuff compression and images of the gastrocnemius and soleus muscles were continuously acquired at rest, during ischemia and reperfusion. Key BOLD parameters were baseline T2* absolute value and time to T2* peak value after cuff deflation (TTP). Correlations between imaging parameters and ankle-brachial index (ABI) was investigated. The mean TTP was considerably prolonged in PAOD patients compared to healthy controls (m. gastrocnemius: 111 ± 46 versus 48 ± 22 s, = 0.000253; m. soleus: 100 ± 42 versus 41 ± 30 s, = 0.000216). Both gastrocnemius and soleus TTP values correlated strongly with ABI (-0.82 and -0.78, < 0.01). BOLD-MRI during reactive hyperemia differentiated most PAOD patients from healthy controls. TTP was the most decisive parameter and strongly correlated with the ABI.
目前尚无直接定量评估下肢组织灌注的既定技术。血氧水平依赖性功能磁共振成像(BOLD-MRI)是一种可用于测定骨骼肌灌注的MRI技术。BOLD-MRI依赖于氧合血红蛋白和脱氧血红蛋白的磁差异,通过T2加权MRI序列可记录氧合/脱氧血红蛋白比例的区域变化。我们旨在测试BOLD-MRI能否区分外周动脉闭塞性疾病(PAOD)患者和健康对照者的下肢组织灌注情况。22例PAOD患者和10名健康老年志愿者接受了下肢BOLD-MRI检查。通过短暂袖带压迫诱发反应性充血,并在静息、缺血和再灌注期间连续采集腓肠肌和比目鱼肌的图像。关键的BOLD参数为基线T2绝对值和袖带放气后T2*峰值时间(TTP)。研究了成像参数与踝臂指数(ABI)之间的相关性。与健康对照者相比,PAOD患者的平均TTP显著延长(腓肠肌:111±46秒对48±22秒,P = 0.000253;比目鱼肌:100±42秒对41±30秒,P = 0.000216)。腓肠肌和比目鱼肌的TTP值均与ABI密切相关(分别为-0.82和-0.78,P<0.01)。反应性充血期间的BOLD-MRI可将大多数PAOD患者与健康对照者区分开来。TTP是最具决定性的参数,且与ABI密切相关。