Clinical analysis of 45 cases of chronic respiratory failure treated by noninvasive ventilator combined with bronchodilator and anti-infective drugs.

Background: The aim of this study is to investigate the therapeutic effects of a non-invasive ventilator combined with bronchodilator and anti-infective drugs in the treatment of 45 cases of chronic respiratory failure.

Methods: 45 chronic respiratory failure patients who were hospitalized to our hospital between August 2019 and January 2022 were chosen as research subjects. They were randomly allocated into two groups using the random number table approach, the control group (n = 21) and the observation group (n = 24), and they were given numbers according to the sequence of treatment.

Design and field evaluation of hydraulic fracturing boreholes for terminal mining faces.

The terminal mining is an essential part of fully mechanized mining, and the reasonable length of the flap roof during the terminal mining is an important basis for the smooth operation of the terminal mining. With the research background of the 213 working face of the Longde Coal Mine, the contribution of this study is the influence law of hydraulic fracturing on the terminal mining mechanical behavior of the working face. Four different numerical calculation models of terminal mining hydraulic fracturing are established, and the optimal hydraulic fracturing site plan is determined according to the length of the terminal mining flap top and the working resistance of hydraulic support.