[Spatial-temporal Variation in Water Quality of Rain-source Rivers in Shenzhen from 2015 to 2021 and Its Response to Rainfall].

Rain-source urban rivers have the characteristics of small water capacity， lack of dynamic water supply， and being easily polluted. This study analyzed the spatial and temporal distribution characteristics of river water quality and the response of characteristic pollutants to rainfall based on daily rainfall data and 21 water quality indicators of nine major river basins in Shenzhen （excluding Shenzhen-Shantou） from 2015 to 2021 by using the single-factor assessment method， comprehensive pollution index method， hierarchical cluster analysis， and Pearson correlation. The results showed that： ① in 2015， the water quality of most sections in the whole region was inferior Class V water.

Wingspan stenting with modified predilation for symptomatic middle cerebral artery stenosis.

Objectives: Our purpose was to assess the feasibility, safety, and effectiveness of a modified predilation for middle cerebral artery (MCA) stenosis.

Background: Wingspan stenting of MCA remains a technical challenge, and rates of residual stenosis and restenosis must be lowered.

Methods: A series of 48 patients with symptomatic MCA stenosis greater than 50% and refractory to medical therapy underwent Wingspan stenting with different balloon/artery ratios before (group 1, Boston guidelines predilation) or after (group 2, modified predilation) July of 2008.