Weizhang Liang

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Abstract Chronic hypertension (CH) during pregnancy, identified before or within the first 20 weeks, presents varying risks depending on the timing of diagnosis. This real-world study was conducted from January 2018 to June 2023 and included singleton pregnancies with CH to compare pre-pregnancy CH (Group 1) and newly diagnosed CH (Group 2). There were 565 women in the final analysis, with 307 in Group 1 with pre-pregnancy CH and 258 in Group 2 with new-onset CH.

1. Introduction Rockburst is a sudden and violent rock failure with a rapid release of energy, and is characterized by the ejection and spalling of rock fragments [1]. It is common in deep hard rock mines, and has become a major threat to mining engineering [2].