Journal
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fbioe.2022.1109892
Keywords
airflow; airflow index; centroid frequency of diaphragm electromyography; diaphragm fatigue; diaphragm pacing
Ask authors/readers for more resources
The objective of this study was to develop a reliable diaphragm pacing system and evaluate its effectiveness through hardware testing and animal experiments. A DP system with bidirectional constant current was designed, manufactured, and tested. The effects of a wide range of stimulus amplitudes and frequencies on airflow and inspired volume were investigated, and differences in airflow characteristics under various stimulation parameters were evaluated. The study found that increasing stimulus frequency and amplitude resulted in different degrees of increase in inspired volume, and the developed DP system caused less diaphragm fatigue with increased stimulation duration.
Objective: Diaphragm pacing (DP) is a long-term and effective respiratory assist therapy for patients with central alveolar hypoventilation and high cervical spinal cord injury. The existing DP system has some limitations, especially high price, inconvenience preoperative evaluation methods and diaphragm fatigue easily. Our objective was to develop a DP system and evaluated reliability through hardware testing and animal experiments.Methods: A DP system with bidirectional constant current was designed, manufactured and tested. Effects of a wide range of stimulus amplitudes (range: .5-2.5 mA) and frequencies (range: 10-250 Hz) on airflow and corresponding inspired volume were investigated during DP. Differences in airflow characteristics under various stimulation parameters were evaluated using power function. ECG interference in diaphragm electromyography (EMGdi) was filtered out using stationary wavelet transform to obtain pure EMGdi (EMGdi(p)). 80-min period with a tendency for diaphragm fatigue by root mean square (RMS) and centroid frequency (f ( c )) of EMGdi(p) was studied.Results: The increase of stimulus frequency and amplitude in animals resulted in different degrees of increase in envoked volume. Significant difference in Airflow Index (b) between anesthesia and DP provided a simple, non-invasive and feasible solution for phrenic nerve conduction function test. Increased stimulation duration with the developed DP system caused less diaphragm fatigue.Conclusion: A modular, inexpensive and reliable DP was successfully developed. Its effectiveness was confirmed in animal experiments.Significance: This study is useful for design of future implantable diaphragmatic pacemakers for improving diaphragm fatigue and convenient assessment of respiratory activity in experiments.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available