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Background: Multidetector computed tomography (MDCT) angiography is a useful examination to detect the source of the bleeding in patients with hemoptysis. The aim of the study was to prospectively evaluate the role and clinical efficacy of MDCT angiography before bronchial artery embolization (BAE) for the management of hemoptysis, and to investigate the predictors of early recurrence. Methods: It is a double-center study which included 57 hemoptysis patients undergoing MDCT angiography prior to BAE from August 2019 to July 2020. A prospective analysis of culprit arteries detected by MDCT angiography allowed an evaluation of the role of this technique. A follow-up was done to assess the efficacy of BAE with preprocedural MDCT angiography and to explore the risk factors of early recurrent hemoptysis. Results: The accuracy of MDCT angiography in the identification of culprit arteries was as high as 97.5%. The average number of total culprit arteries per patient was 2.75 ± 1.73. Among which, the average numbers of culprit ectopic bronchial arteries (BAs) and non-bronchial systemic arteries (NBSAs) per patient were 0.21 ± 0.41 and 1.04 ± 1.57, respectively. The immediate clinical success rate, total hemoptysis recurrence rate, and early hemoptysis recurrence rate of BAE following MDCT angiography were 94.7, 18.5, 16.7%, respectively. Aspergilloma (HR = 6.63, 95% CI: 1.31-33.60, p = 0.022) was associated with an increase in the risk of early recurrence. Conclusions: MDCT angiography should be performed before BAE for the management of hemoptysis. Aspergilloma was an independent predictor for early recurrence.

The Mong Cai area, coastal sediments were collected and analyzed for grain sizes, heavy metals, total organic carbon, and isotopes (210Pb, 226Ra, δ15N, δ13C) for assessing sediment quality.Which sediments common were fine sand in surface sediment, very fine sand in core C1, very coarse silt and coarse silt in core C2. The total organic carbon was highest in C2 next to the surface and lowest in C1, with content levels of 1.81%, 0.40%, and 0.31%, respectively. δ13C and δ15N in the sediment reflected the source of the organic matter mix from the marine and terrigenous sediments. Heavy metals were lower than ISQGs, exception of As in C1 and C2 were higher, in C1 showed a decline over time, while in C2 increased between 1996 and 2019. The Mong Cai area was common by sand, accumulation of heavy metals was small, impact of heavy metal pollution on ecosystems was low.

Marine sediment quality at Vietnam’s coastal monitoring stations in 2020 has an average ecological risk impact, with an average SQG-Q index of 0.16. 4-Four out of 24 stations have sediment quality with zero ecological risk impact, including Bach Long Vi, Thuan An, Phan Thiet, and Sa Huynh stations. The remaining stations (20/24 stations) have sediment quality with moderate ecological risk impact. The SQG-Q indices in 2020 and 2019 tend to decrease compared to 2018 and 2017.