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Hemodynamic Outcome of Successful Bypass Surgery in Patients with Atherosclerotic Cerebrovascular Disease: A study with Acetazolamide and $^{99m}Tc-ECD$ SPECT  

Eo, Jae-Seon (Department of Nuclear Medicine, Seoul National University College of Medicine)
Oh, Chang-Wan (Department of Neurosurgery, Seoul National University College of Medicine)
Kim, Yu-Kyeong (Department of Nuclear Medicine, Seoul National University College of Medicine)
Park, Eun-Kyung (Department of Nuclear Medicine, Seoul National University College of Medicine)
Lee, Won-Woo (Department of Nuclear Medicine, Seoul National University College of Medicine)
Kim, Sang-Eun (Department of Nuclear Medicine, Seoul National University College of Medicine)
Publication Information
Nuclear Medicine and Molecular Imaging / v.40, no.6, 2006 , pp. 293-301 More about this Journal
Abstract
Purpose: The aim of the study was to evaluate the hemodynamic changes after successful bypass surgery in patients with atherosclerotic stenosis in ICA using $^{99m}Tc-ECD$ SPECT. Materials and Methods: Fourteen patients (M:F=8:6, mean age; $60{\pm}9$ years) who underwent STA-MCA anastomosis for unilateral atherosclerotic cerebrovascular disease were enrolled. $^{99m}Tc-ECD$ basal/acetazolamide perfusion SPECT studies were performed before, 10 days and 6 months after bypass surgery. Perfusion reserve was defined as the % changes after acetazolamide over rest image. Regional cerebral blood flow and perfusion reserve were compared preoperative, early-postoperative and late-postoperative scans. Results: The mean resting perfusion and decrease in perfusion reserve in affected ICA territory on preoperative scan was $52.4{\pm}3.5\;and\;-7.9{\pm}4.7%$, respectively. The resting perfusion was significantly improved after surgery on early-postoperative scan (mean $53.7{\pm}2.7$) and late-postoperative scan (mean $53.3{\pm}2.5$) compared with preoperative images (p<0.05, respectively). Resting perfusion did not showed further improvement on late-postoperative scan compared with early-postoperative scan. The perfusion reserve was $-3.7{\pm}2.6%$ on early-postoperative scan, and $-1.6{\pm}2.3%$ on late-postoperative scan, which was significantly improved after surgery. Additionally, further improvement of perfusion reserved as observed on late-postoperative scan (p<0.05). While, in the unaffected ICA territory, no significant changes in the resting perfusion and perfusion reserve was observed. Conclusion: The improvement of resting perfusion and perfusion reserve in early-postoperative scan reflects the immediate restoration of the cerebral blood flow by bypass surgery. In contrasts, further improvement of perfusion reserve showing on late-postoperative scan may indicate a good collateral development after surgery, which may indicate good surgical outcome after surgery.
Keywords
atherorclerotic carotid artery stenosis; STA-MCA anastomosis; hemodynamic changes; acetazolamide; $^{99m}Tc-ECD$ SPECT;
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