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A comparison of intra- versus post-operatively acquired electrically evoked compound action potentials
G K A van Wermeskerken1, A F van Olphen, G A van Zanten
1Department of Otorhinolaryngology, University Medical Center Utrecht, The Netherlands. gijs@vanwermeskerken.com
International Journal of Audiology
|October 26, 2006
Summary
Intra-operative recording of electrically evoked compound action potential (ECAP) thresholds in cochlear implant patients yielded a higher success rate than post-operative recordings. This suggests the intra-operative setting is preferable for ECAP threshold acquisition.
Area of Science:
- Audiology
- Neurosurgery
- Biomedical Engineering
Background:
- Cochlear implants are vital for hearing restoration in severe to profound hearing loss.
- Electrically evoked compound action potentials (ECAPs) assess neural integrity and aid in programming cochlear implants.
- Comparing intra-operative versus post-operative ECAP measurements is crucial for optimizing device fitting.
Purpose of the Study:
- To compare the success rates and reliability of ECAP threshold measurements obtained intra-operatively versus post-operatively in adult cochlear implant recipients.
- To determine the preferred clinical setting for accurate ECAP threshold acquisition.
Main Methods:
- A prospective study involving 25 adult patients receiving multichannel cochlear implants.
- ECAP thresholds were recorded immediately after surgery and again at a 9-month post-operative follow-up.
- Statistical analysis was performed to compare success rates and correlate thresholds between the two measurement times.
Main Results:
- The intra-operative ECAP threshold acquisition success rate was high at 97.4%, significantly higher than the 53.4% success rate in the post-operative setting.
- Despite differing success rates, ECAP thresholds showed statistically significant correlations between intra-operative and post-operative measurements.
- No significant difference was found in the ECAP threshold values themselves between the two settings.
Conclusions:
- The intra-operative setting offers a more reliable and successful method for acquiring ECAP thresholds in cochlear implant patients.
- Clinical protocols may benefit from prioritizing intra-operative ECAP measurements for initial device programming.
- Further research could explore reasons for lower post-operative success rates to improve future measurements.
Related Concept Videos
01:41Action Potentials
Overview
01:14Action Potential
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
01:23Propagation of Action Potentials
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
01:32Postsynaptic Potential (PSP)
Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
01:28Action Potential: Phases of Stimulation
The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...