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Transcutaneous respiratory electromyographic monitoring
Insights
Transcutaneous diaphragm electromyography (tcEMG) reliably monitors infant breathing. This noninvasive technique is valuable for assessing diaphragm function and respiratory disorders, even in ventilated patients.
Area of Science:
- Biomedical Engineering
- Respiratory Physiology
- Neonatal Medicine
Background:
- The integrated diaphragm electromyogram (EMG) signal is crucial for understanding respiratory control.
- Noninvasive monitoring of diaphragm function is essential for diagnosing and managing respiratory issues in infants.
Purpose of the Study:
- To confirm the feasibility and value of transcutaneous diaphragm electromyography (tcEMG) in infants.
- To evaluate tcEMG's utility in both spontaneously breathing and mechanically ventilated infants.
Main Methods:
- Continuous tcEMG monitoring was performed on infants using prototype respiratory EMG monitors.
- Measurements were obtained in 100 infants for clinical reasons and 47 for technical/experimental reasons.
- Shielded electrode cables were essential for reliable diaphragm EMG measurements.
Main Results:
- Reliable diaphragm EMG activity measurements were achieved with tcEMG.
- tcEMG is not affected by ventilator-induced movements, unlike other non-electrophysiologic measures.
- tcEMG demonstrated its value in identifying diaphragmatic inactivity, neuromuscular block, and altered respiratory drive.
Conclusions:
- Transcutaneous diaphragm electromyography (tcEMG) is a feasible and valuable noninvasive respiratory monitoring technique for infants.
- tcEMG offers unique insights into diaphragm function, aiding in the diagnosis of various respiratory conditions.
- This method complements existing noninvasive respiratory monitoring tools.
Abstract:
The integrated diaphragm electromyogram (EMG) signal reflects function from the inspiratory centers to the neuromuscular junction. The feasibility and potential value of transcutaneous diaphragm electromyography (tcEMG) was confirmed in a group of infants using two prototype respiratory EMG monitors. Infants were monitored continuously for periods ranging from hours to days. One hundred were monitored for clinical reasons, looking for disordered respiratory behavior, while 47 were studied for technical/experimental reasons. Reliable measurements of diaphragm EMG activity were obtained, provided fully shielded electrode cables were used. Measurements in 28 ventilated infants and one adult confirmed that, unlike impedance and other non-electrophysiologic measures, tcEMG monitoring is not contaminated by ventilator-induced respiratory movements. The potential value of tcEMG monitoring in ventilated subjects is exemplified by illustrations of: diaphragmatic inactivity from phrenic nerve injury, inadequate central drive, and neuromuscular block; augmented expiratory muscle activity; and progressive increase in inspiratory diaphragmatic activity in the presence of a tension pneumothorax. TcEMG monitoring should prove a worthwhile addition to the available noninvasive respiratory monitoring techniques.