ABSTRACT
A novel technology is proposed for non-contact and real-time detection of atrial fibrillation using millimeter-wave radar.A 60 GHz PCR millimeter wave radar is used to continuously detect the chest echo signal of the subject.After signal acquisition,I-Q signal is generated through I-Q demodulation,and the signal phase information is extracted using effective points phase trend evaluation for obtaining the signals from oscillations in the chest wall,from which the respiratory signals and cardiac signals are extracted through digital filtering for the analysis of cardiac movement.Whether the atrial fibrillation occurs or not is determined by the characteristics of atrial fibrillation wave in the time domain.The effective points phase trend evaluation for extracting more accurate signal phase information and the time-domain method for real-time atrial fibrillation detection are the innovations of the study.The experimental results show that the proposed method achieves a detection accuracy of 99.2%in clinic.
ABSTRACT
Objective:To explore the relationship between the diameter of drainage used in closed thoracic drainage (CTD) and the prognosis of patients with thoracic trauma.Methods:This study was a retrospective cohort study, a total of 146 patients who were admitted to the 971st Navy Hospital due to thoracic trauma from April 2017 to June 2021 and received closed thoracic drainage were selected as the research subjects. According to the prognosis, they were divided into a good group ( n=96) and a poor group ( n=50), and the clinical efficacy, general data and postoperative complications of the two groups were compared and analyzed. Multivariate Logistic regression was used to analyze the risk factors for poor prognosis, and a nomogram prediction model was established, and the model was evaluated. The relationship between the size of drainage diameter and the prognosis of patients with thoracic trauma was analyzed by Pearson correlation. The normally distributed measurement data was expressed by the ( ± s), and the independent samples t test was used for comparison between groups; The chi-square test was used for comparison of count data between groups. Results:The clinical efficacy of CTD was good, with a total effective probability of 87.67%; and 3 weeks after surgery, the patient′s prognosis was good, with a good prognosis probability of 65.75%. Logistic analysis showed that age 60 years old ( OR=1.501, 95% CI: 1.105-2.177), excipient replacement time of 2-3 d ( OR=2.543, 95% CI: 1.729-3.168), drainage bottle higher than thoracic cavity ( OR=1.692, 95% CI: 1.314-2.482), long wound healing time ( OR=1.971, 95% CI: 1.479-2.720), frequent cough ( OR=2.259, 95% CI: 1.564-2.924), and drainage tube diameter 16 F ( OR=3.087, 95% CI: 2.074-3.793) were independent risk factors for poor prognosis ( P<0.05). The size of drainage diameter was positively correlated with hospitalization and wound healing time, pain VAS score ( P<0.05), and negatively correlated with Barthel Index ( P<0.05). Conclusion:Drainage tube diameter 16 F is one of the independent risk factors for poor prognosis of patients. The smaller the drainage diameter, the shorter the postoperative hospital stay, faster wound healing, lighter pain and stronger ability of life and activity.