The end tidal carbon dioxide(EtCO_(2))is crucial for monitoring patients respiratory function,which reflects the status of lung ventilation and gas exchange.Therefore,achieving accurate measurements of EtCO_(2)holds s...The end tidal carbon dioxide(EtCO_(2))is crucial for monitoring patients respiratory function,which reflects the status of lung ventilation and gas exchange.Therefore,achieving accurate measurements of EtCO_(2)holds significant importance in clinical practice.The measurements of EtCO_(2)based on wavelength modulation-direct absorption spectroscopy(WM-DAS)had great advantages and the noise reduction of spectrum was very important.An optimized variational mode decomposition(VMD)algorithm improved by the dung beetle optimization algorithm and wavelet packet denoising algorithm was proposed to enhance the measurement accuracy of EtCO_(2)concentration.The dung beetle optimization algorithm was used to obtain the optimal number of decomposition mode layers K and secondary penalty factorα.The optimal parameters were used to decompose the original transmitted light intensity signal with noise,and a series of intrinsic mode functions(IMFs)were obtained.Pearson correlation coefficient(R)was used to select the pure signal and the noisy signal,and the noisy signal was denoised by wavelet packet denoising algorithm.The transmitted light intensity signal was reconstructed by the signal processed by wavelet packet denoising algorithm and the pure signal.The results showed that the proposed algorithm could effectively remove the noise of signal of transmitted light intensity and improve the accuracy of concentration measurements of EtCO_(2).展开更多
To the Editor,A 26-year-old woman with congenital heart disease,postatrial septal defect repair,postarterial catheter ligation,hypoxia-associated pulmonary hypertension,and reduced right heart function,which manifeste...To the Editor,A 26-year-old woman with congenital heart disease,postatrial septal defect repair,postarterial catheter ligation,hypoxia-associated pulmonary hypertension,and reduced right heart function,which manifested as a severe decrease in activity tolerance,chest tightness and shortness of breath,and easy fatigue of breathing,was treated with oxygen,targeting medications such as anisentan,tadalafil,remodulin,and diuretic potassium supplementation to enhance cardiac function,and then her symptoms were slightly improved compared with the previous ones.She was guided with in-hospital respiratory training to the extent that the patient could tolerate it and then was discharged from the hospital to have a home-based respiratory rehabilitation for a period of 3 months.The training plan was as follows:(i)Respiratory muscle function test:the patient's resting maximal inspiratory pressure(MIP)and maximal expiratory pressure(MEPw)ere assessed by the respiratory trainer equipment,and the respiratory muscle weakness/invulnerability was defined as a measured maximal pressure value less than 80 cmH_(2)0 according to the ERS guidelines.展开更多
基金supported by the Key Research and Development Program of Hebei Province(No.22375415D).
文摘The end tidal carbon dioxide(EtCO_(2))is crucial for monitoring patients respiratory function,which reflects the status of lung ventilation and gas exchange.Therefore,achieving accurate measurements of EtCO_(2)holds significant importance in clinical practice.The measurements of EtCO_(2)based on wavelength modulation-direct absorption spectroscopy(WM-DAS)had great advantages and the noise reduction of spectrum was very important.An optimized variational mode decomposition(VMD)algorithm improved by the dung beetle optimization algorithm and wavelet packet denoising algorithm was proposed to enhance the measurement accuracy of EtCO_(2)concentration.The dung beetle optimization algorithm was used to obtain the optimal number of decomposition mode layers K and secondary penalty factorα.The optimal parameters were used to decompose the original transmitted light intensity signal with noise,and a series of intrinsic mode functions(IMFs)were obtained.Pearson correlation coefficient(R)was used to select the pure signal and the noisy signal,and the noisy signal was denoised by wavelet packet denoising algorithm.The transmitted light intensity signal was reconstructed by the signal processed by wavelet packet denoising algorithm and the pure signal.The results showed that the proposed algorithm could effectively remove the noise of signal of transmitted light intensity and improve the accuracy of concentration measurements of EtCO_(2).
文摘To the Editor,A 26-year-old woman with congenital heart disease,postatrial septal defect repair,postarterial catheter ligation,hypoxia-associated pulmonary hypertension,and reduced right heart function,which manifested as a severe decrease in activity tolerance,chest tightness and shortness of breath,and easy fatigue of breathing,was treated with oxygen,targeting medications such as anisentan,tadalafil,remodulin,and diuretic potassium supplementation to enhance cardiac function,and then her symptoms were slightly improved compared with the previous ones.She was guided with in-hospital respiratory training to the extent that the patient could tolerate it and then was discharged from the hospital to have a home-based respiratory rehabilitation for a period of 3 months.The training plan was as follows:(i)Respiratory muscle function test:the patient's resting maximal inspiratory pressure(MIP)and maximal expiratory pressure(MEPw)ere assessed by the respiratory trainer equipment,and the respiratory muscle weakness/invulnerability was defined as a measured maximal pressure value less than 80 cmH_(2)0 according to the ERS guidelines.
