Abstract
We investigated whether postoperative hyperperfusion in moyamoya disease can be predicted using intraoperative laser Doppler flowmetry and/or thermography. A prospective study was conducted on 27 patients (39 hemispheres) with moyamoya disease who underwent superficial temporal artery–middle cerebral artery (STA–MCA) bypass. During surgery, regional cerebral blood flow (rCBF) was measured with a laser Doppler flowmeter and the temperature of the cortical surface was measured with an infrared thermograph. Postoperative hyperperfusion was assessed immediately after surgery based on CBF study under sedation (propofol) as >100% increase in corrected rCBF compared to preoperative values. Postoperative hyperperfusion on CBF was observed in two patients (7.4%). A significant correlation was observed between intraoperative rCBF changes and postoperative rCBF increase (Pearson’s method: r = 0.555, p = 0.0003; simple regression: Y = 1.22X + 3.289, r 2 = 0.308, p = 0.0004). Furthermore, the rCBF changes measured by laser Doppler flowmetry were significantly greater in patients with postoperative hyperperfusion (p = 0.0193) and CHS (p = 0.0193). The present study suggests that intraoperative rCBF measurement using laser Doppler flowmetry may predict a risk of post-EC–IC bypass cerebral hyperperfusion in moyamoya disease.
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This study was supported by research funds of Department of Neurosurgery, Tokyo Women’s Medical University.
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Yasuhiro Yonekawa, Zurich, Switzerland
Kawamata et al. have shown an elegant method to predict a risk of postoperative hyperperfusion after STA-MCA bypassfor Moyamoya disease by using laser Dopplerflowmetryintraoperatively at the time of EC-IC bypass surgery, what could be confirmed by postoperative Xe-CT scan-|rCBF measurement. This simple method would contribute to the management of postoperative hyperperfusion, although its occurrence has been reported to be rather infrequent but can be associated with considerable sequelae.
By the way, it was my little surprise that intraoperative thermography change did not correlate with postoperative rCBF change. This might be due to inherent methodological problems namelythis can be delicately influenced byroom temperature and/or heat produced by the light of operating microscope. I would be interested for the purpose to use the Peltier stack which would have less above mentioned problems and its usefulnessfulness was very impressive at the time of parent artery temporary occlusionalong with simplicity of its handling in aneurysm surgery (1).
References
1. Ogata N, Fournier JY, Imhof HG, Yonekawa Y: Thermal diffusion blood flow monitoring during aneurysm surgery. ActaNeurochir (Wien) 138: 726–731, 1996
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Kawamata, T., Kawashima, A., Yamaguchi, K. et al. Usefulness of intraoperative laser Doppler flowmetry and thermography to predict a risk of postoperative hyperperfusion after superficial temporal artery–middle cerebral artery bypass for moyamoya disease. Neurosurg Rev 34, 355–362 (2011). https://doi.org/10.1007/s10143-011-0331-8
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DOI: https://doi.org/10.1007/s10143-011-0331-8