Co-activation of the diaphragm and external intercostal muscles through an adaptive closed-loop respiratory pacing controller.
Rabeya Zinnat Adury, Ricardo Siu, Ranu Jung
PMID 37484600WHAT IT FOUND
In anesthetized rats, combining diaphragm and intercostal muscle stimulation with an adaptive controller required less electrical charge for the diaphragm, delayed fatigue, and produced larger sighs than diaphragm stimulation alone.
Key findings
01Combined diaphragm and intercostal stimulation required significantly less charge per cycle for the diaphragm muscle than diaphragm-only stimulation.
02The fatigue index for the diaphragm muscle was significantly lower during combined muscle stimulation compared to diaphragm-only stimulation.
03Combined stimulation produced a significantly larger sigh tidal volume factor than diaphragm-only stimulation.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was conducted on anesthetized rats, not humans or patients with spinal cord injury or stroke. Anesthesia (isoflurane) depresses respiration and alters CO2 levels, which may affect how the controller adapts compared to an awake state. The controller only assisted inspiration; expiration remained passive, so it did not address coughing or airway clearance. Sample size was small (n=8), and some animals were excluded from specific analyses due to trial length or technical issues.
Declared interests
The authors declare no conflicts of interest in the provided text.
The easy way to misread this
Do not interpret these findings as evidence that this specific controller or combined muscle pacing strategy is ready for or effective in human patients. The results are strictly limited to an acute animal model under anesthesia.