Spinal Cord Stimulation Frequency Influences the Hemodynamic Response in Patients with Disorders of Consciousness / 神经科学通报·英文版

Spinal cord stimulation (SCS) is a promising technique for treating disorders of consciousness (DOCs). However, differences in the spatio-temporal responsiveness of the brain under varied SCS parameters remain unclear. In this pilot study, functional near-infrared spectroscopy was used to measure the hemodynamic responses of 10 DOC patients to different SCS frequencies (5 Hz, 10 Hz, 50 Hz, 70 Hz, and 100 Hz). In the prefrontal cortex, a key area in consciousness circuits, we found significantly increased hemodynamic responses at 70 Hz and 100 Hz, and significantly different hemodynamic responses between 50 Hz and 70 Hz/100 Hz. In addition, the functional connectivity between prefrontal and occipital areas was significantly improved with SCS at 70 Hz. These results demonstrated that SCS modulates the hemodynamic responses and long-range connectivity in a frequency-specific manner (with 70 Hz apparently better), perhaps by improving the cerebral blood volume and information transmission through the reticular formation-thalamus-cortex pathway.

Current Status of Neuromodulatory Therapies for Disorders of Consciousness / 神经科学通报·英文版

Treatment for disorders of consciousness (DOCs) is still a Gordian knot. Evidence-based guidelines on the treatment of DOC patients are not currently available, while neuromodulation techniques are seen as a potential treatment. Multiple neuromodulation therapies have been applied. This article reviews the most relevant studies in the literature in order to describe a clear picture of the current state of neuromodulation therapies that could be used to treat DOC patients. Both invasive and non-invasive brain stimulation is discussed. Significant behavioral improvements in prolonged DOCs under neuromodulation therapies are rare. The efficacy of various such therapies remains a matter of debate. Further clinical investigations of existing techniques in larger samples properly controlling for spontaneous recovery are needed, and new approaches are awaited.

Dynamic changes of renal blood perfusion in Goto-Kakizaki rats using contrast-enhanced ultrasonography / 中华超声影像学杂志

Objective To explore dynamic changes of renal cortex blood perfusion in Goto-Kakizaki rats(GK rats) by contrast-enhanced ultrasonography.The clues for early diagnosis and intervention of diabetic renal impairment may be obtained from the study.Methods Male GK rats were taken as experimental groups,and Wistar male rats were used as controls.Contrast-enhanced agent SonoVue was administered via the femoral vein cannulation in a bolus fashion.Image changes of renal cortex were observed in real time, and dynamic image changes within 0 - 5 minute after injection were observed and stored.The renal cortex blood perfusion changes were analyzed using the time-intensity curve (TIC).Results (1) The kidney was quickly enhanced after the injection of contrast agent.The renal artery, cortex, renal vein were displayed in sequence.(2)The shape of renal perfusion TIC in all the objects was a single peak,steep ascending, flat descending curve.The overall shape of TIC in GK rats was wider than controls and they were wider and wider with age increasing of the GK rats.(3) Compare to controls,the time to peak (TTP)and the half time of peak descending (HDT) in GK rats was longer (P ＜0.01), the slope rates of the ascending curve (S1) and the slope rates of the descending curve (S2) decreased and the area under the curve increased in 12-week-old and 20-week-old GK rats (P ＜ 0.05 or P ＜ 0.01).Conclusions The abnormal blood perfusion of renal cortex microcirculation was present in the early stage of diabetic in GK rats.Real-time contrast-enhanced ultrasonography and TIC could display this change effectively.