Phrenic Nerve Pacing
Phrenic Nerve Pacing - Related Videos
01:59
Measuring Compound Muscle Action Potentials by Stimulating the Phrenic Nerve in a Rat
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2025
This video describes recording compound muscle action potentials (CMAPs) in diaphragm muscle fibers in a rat through phrenic nerve stimulation. A high-intensity electric pulse stimulation of the phrenic nerve generates action potentials in the diaphragm muscle fibers, which are observed by obtaining the response curve.
09:43
Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
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Cited by 16 •
2015
Compound muscle action potential recording quantitatively assesses functional diaphragm innervation by phrenic motor neurons. Whole-mount diaphragm immunohistochemistry assesses morphological innervation at individual neuromuscular junctions. The goal of this protocol is to demonstrate how these two powerful methodologies can be used in various rodent models of spinal cord disease.
06:14
Translational Rabbit Model of Chronic Cardiac Pacing
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2023
We present a minimally invasive leporine model of long-term cardiac pacing that can be utilized for artificial pacing and heart failure development in preclinical studies.
09:05
Retrograde Neuroanatomical Tracing of Phrenic Motor Neurons in Mice
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Cited by 12 •
2018
Here, we describe a protocol for identifying phrenic motor neurons in mice after intrapleural delivery of fluorophore conjugated cholera toxin subunit beta. Two techniques are compared to inject the pleural cavity: transdiaphragmatic versus transthoracic approaches.
02:50
Toluidine Blue Staining of Peripheral Nerve Sections: A Technique to Stain Myelinated Nerve Fibers For Peripheral Nerve Structure Visualization
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2025
This video demonstrates the staining technique of resin-embedded, osmium tetroxide-treated rat peripheral nerve sections using toluidine blue. The stained nerve sections help visualize the fine structures of peripheral nerves.
FAQs
Timed electrical pulses activate the phrenic nerves or the diaphragm, causing repeated diaphragm contractions. These contractions create the pressure changes needed to draw air into the lungs. The effectiveness of pacing therefore depends on whether stimulation produces a consistent respiratory rhythm and an adequate diaphragm response, rather than simply on delivering electrical energy.
Pacing requires a functional pathway capable of responding to electrical stimulation. Assessment of phrenic nerve function helps determine whether the nerves can transmit the pacing signal to the diaphragm and generate contraction. This evaluation, together with examination of lung health, helps identify patients who are more likely to respond appropriately to the technique.
Mechanical ventilation supplies ventilatory support externally, whereas pacing uses electrical activation to promote the patient’s own diaphragm contractions. Because it encourages more physiologic breathing and ongoing diaphragm activity, phrenic nerve pacing may reduce dependence on mechanical ventilation in selected patients. The approach does not eliminate the need for careful respiratory assessment or monitoring.
The technique may be considered when respiratory drive or neural control is impaired, including central hypoventilation, high spinal cord injury, or prolonged dependence on mechanical ventilation. These conditions do not by themselves establish suitability. Clinicians must also consider lung health, remaining nerve function, and whether pacing produces an effective respiratory response.
Evaluation begins with determining whether the patient’s impaired breathing relates to respiratory drive or neural control and whether phrenic nerve function remains adequate. Clinicians also assess lung health and observe the response to pacing. These findings guide decisions about whether implanted electrodes and timed stimulation can provide useful ventilatory support.
In selected patients, pacing can support ventilation, promote diaphragm activity, and reduce reliance on mechanical ventilation. Its value is assessed by the quality of the pacing response and the patient’s respiratory management needs. The method is particularly relevant when impaired central drive, neural control, or prolonged ventilator dependence limits spontaneous breathing.