Hypertension increases cerebral 6-18F-fluorodopa-derived radioactivity.

Hypertension increases cerebral 6-18F-fluorodopa-derived radioactivity.
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DOI:
10.2967/jnumed.109.062869
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发表时间:
2009-09
期刊:
Journal of nuclear medicine : official publication, Society of Nuclear Medicine
影响因子:
--
通讯作者:
Kopin IJ
Kopin IJ
中科院分区:
其他
文献类型:
--
作者:
Goldstein DS;Holmes C;Sewell L;Kopin IJ

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6-18F-氟多巴PET显示帕金森病(PD)的纹状体多巴胺能病变;然而,纹状体对6-18F-氟多巴来源的放射性的摄取可以是正常的。仰卧位高血压可使6-18F-氟多巴摄取增加。我们测量了PD+SH患者(n=8)、无SH患者(PD≥SH,n=19)、单纯自主神经衰竭患者(n=8)和对照组(n=16)的壳核、尾状核和枕叶皮质6-18F-F-氟多巴衍生的放射性和仰卧位血压。结果显示,PD+SH患者(n=8)和PD无SH患者(PD−SH,n=19)的仰卧位血压与壳核、尾状核和枕叶皮质的6-18F-F-F-F放射性分布有关。所有受试者和PD患者的壳核峰值放射性与仰卧位收缩压相关,且PD+SH组高于PD−SH组(P=0.0 1)。两个亚组的放射性在峰值和晚期之间都有快速的下降(P<0.0001,与对照组相比)。对照组动脉血中6-18F-氟多巴浓度相似。在帕金森病患者,SH与纹状体6-18F-氟多巴衍生的放射性增强有关。无论SH如何,6-18F-氟多巴衍生的放射性滞留显著降低。一种不依赖模型的方法可以识别帕金森病患者的纹状体多巴胺能去神经。
6-18F-fluorodopa PET depicts the striatal dopaminergic lesion characterizing Parkinson disease (PD); however, striatal uptake of 6-18F-fluorodopa–derived radioactivity can be normal. Supine hypertension (SH) might increase 6-18F-fluorodopa uptake. We measured putamen, caudate, and occipital cortex 6-18F-fluorodopa–derived radioactivity and supine blood pressure in patients with PD + SH (systolic pressure ≥ 180 mm Hg, n = 8), patients with PD without SH (PD − SH, n = 19), patients with pure autonomic failure (n = 8), and controls (n = 16). Peak putamen radioactivity correlated with supine systolic pressure across all subjects and among PD patients and was higher in PD + SH than in PD − SH (P = 0.01). Both subgroups had rapid fractional declines in radioactivity between the peak and late values (P < 0.0001, compared with controls). Arterial 6-18F-fluorodopa concentrations were similar in the compared groups. In PD, SH is associated with augmented striatal 6-18F-fluorodopa–derived radioactivity. Regardless of SH, retention of 6-18F-fluorodopa–derived radioactivity is markedly reduced. A model-independent approach can identify striatal dopaminergic denervation in PD.
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