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Intraoperative Neuromonitoring and Anesthetic Effects
Research Guide
What is Intraoperative Neuromonitoring and Anesthetic Effects?
Intraoperative neuromonitoring and anesthetic effects refers to the application of neurophysiological monitoring techniques, such as somatosensory evoked potentials and motor evoked potentials, during surgery to detect neurological risks while accounting for influences from anesthesia that alter signal amplitudes and latencies.
This field encompasses 14,801 papers focused on monitoring motor evoked potentials and somatosensory evoked potentials to reduce neurological complications in spinal cord and spine surgery. Techniques address anesthesia complications, ischemic optic neuropathy, positioning injuries, visual loss, and peripheral nerve injuries. Growth rate over the past 5 years is not available.
Topic Hierarchy
Research Sub-Topics
Motor Evoked Potentials in Spine Surgery
This sub-topic covers MEP monitoring protocols, anesthetic optimization, and alarm criteria during scoliosis and deformity corrections. Researchers analyze signal changes for real-time spinal cord ischemia detection.
Somatosensory Evoked Potentials Intraoperative Monitoring
This sub-topic examines SSEP latency/amplitude thresholds, multimodal integration with MEPs, and false-positive mitigation strategies. Researchers study cortical and subcortical generators for comprehensive pathway assessment.
Anesthetic Effects on Intraoperative Neuromonitoring
This sub-topic investigates volatile anesthetics, TIVA protocols, and remifentanil impacts on MEP/SSEP amplitudes. Researchers develop dose-response models and reversal strategies with ketamine or propofol adjustments.
Ischemic Optic Neuropathy in Spine Surgery
This sub-topic analyzes risk factors like blood loss, hypotension, and prone positioning in ION cases post-spine fusion. Researchers review ASA databases for incidence, prevention via perfusion maintenance.
Peripheral Nerve Injuries from Surgical Positioning
This sub-topic studies ulnar, brachial plexus, and peroneal neuropathies in prone/lateral decubitus setups. Researchers evaluate padding, pressure mapping, and EMG confirmation for injury mechanisms.
Why It Matters
Intraoperative neuromonitoring with somatosensory evoked potentials reduces neurologic deficits after scoliosis surgery, as shown in a multicenter survey where monitoring was associated with fewer deficits. Nuwer et al. (1995) in "Somatosensory evoked potential spinal cord monitoring reduces neurologic deficits after scoliosis surgery: results of a large multicenter survey" reported results from a large survey demonstrating this benefit. These methods mitigate risks in spinal cord surgery, including those from anesthesia-related changes in evoked potentials, as described in foundational work on evoked potentials by Chiappa and Ropper (1982) in "Evoked Potentials in Clinical Medicine", which details short-latency somatosensory evoked potentials' relation to sensory tract anatomy.
Reading Guide
Where to Start
"Somatosensory evoked potential spinal cord monitoring reduces neurologic deficits after scoliosis surgery: results of a large multicenter survey" by Nuwer et al. (1995), as it provides direct clinical evidence of neuromonitoring's effectiveness in reducing deficits, making it an accessible entry to practical applications.
Key Papers Explained
Nuwer et al. (1995) in "Somatosensory evoked potential spinal cord monitoring reduces neurologic deficits after scoliosis surgery: results of a large multicenter survey" establishes clinical efficacy of somatosensory monitoring. Chiappa and Ropper (1982) in "Evoked Potentials in Clinical Medicine" provides foundational explanation of evoked potentials' anatomical basis, underpinning monitoring techniques. Gruner (1992) in "A Monitored Contusion Model of Spinal Cord Injury in the Rat" connects experimental injury models to monitoring needs in surgery.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research continues on anesthetic modulation of cortical excitability, as in Nitsche et al. (2003) "Pharmacological Modulation of Cortical Excitability Shifts Induced by Transcranial Direct Current Stimulation in Humans" and Nitsche et al. (2005) "Modulating parameters of excitability during and after transcranial direct current stimulation of the human motor cortex", exploring excitability shifts relevant to intraoperative signals. Variability in responses, per Wiethoff et al. (2014) in "Variability in Response to Transcranial Direct Current Stimulation of the Motor Cortex", remains a key challenge.
Papers at a Glance
Frequently Asked Questions
What are somatosensory evoked potentials used for in intraoperative monitoring?
Somatosensory evoked potentials are recorded after peripheral sensory nerve stimulation to monitor spinal cord function during surgery. Chiappa and Ropper (1982) in "Evoked Potentials in Clinical Medicine" explain their close relation to sensory tract anatomy, similar to brain-stem auditory evoked potentials. They help detect neurological risks in procedures like scoliosis surgery.
How does intraoperative neuromonitoring reduce deficits in scoliosis surgery?
Somatosensory evoked potential monitoring during scoliosis surgery lowers neurologic deficits. Nuwer et al. (1995) in "Somatosensory evoked potential spinal cord monitoring reduces neurologic deficits after scoliosis surgery: results of a large multicenter survey" present multicenter survey results confirming this reduction. The technique identifies issues promptly to prevent permanent injury.
What is the role of evoked potentials in clinical medicine for surgery?
Evoked potentials assess neurological integrity during surgery by measuring responses to stimuli. "Evoked Potentials in Clinical Medicine" (1982) by Chiappa and Ropper covers short-latency somatosensory evoked potentials' waveforms linked to anatomy. They are essential for monitoring in spinal and other high-risk surgeries.
How do anesthetic effects influence neuromonitoring signals?
Anesthetics alter cortical excitability and evoked potential amplitudes in neuromonitoring. Papers on transcranial direct current stimulation, such as Nitsche et al. (2003) in "Pharmacological Modulation of Cortical Excitability Shifts Induced by Transcranial Direct Current Stimulation in Humans", show pharmacological modulation affects excitability shifts relevant to anesthetic impacts. Monitoring adjusts for these changes to ensure accurate neurological assessment.
What spinal cord injury models relate to neuromonitoring?
Contusion models of spinal cord injury aid in understanding neuromonitoring responses. Gruner (1992) in "A Monitored Contusion Model of Spinal Cord Injury in the Rat" describes a monitored model for studying injury mechanisms. This informs intraoperative techniques to prevent similar deficits.
Open Research Questions
- ? How do specific anesthetic agents quantitatively alter motor evoked potential thresholds during spine surgery?
- ? What are the optimal stimulation parameters for reliable somatosensory evoked potentials under varying anesthesia depths?
- ? Why do some patients show high variability in evoked potential responses despite standardized neuromonitoring protocols?
- ? Which combinations of pharmacological modulation best preserve neuromonitoring signal integrity in high-risk spinal procedures?
- ? How can positioning injuries be detected and mitigated in real-time using intraoperative evoked potentials?
Recent Trends
The field maintains 14,801 papers with no specified 5-year growth rate.
Recent emphasis appears on excitability modulation from pharmacological and stimulation effects, as in Nitsche et al. with 730 citations on tDCS parameters and Wiethoff et al. (2014) with 792 citations on response variability, informing anesthetic adjustments in neuromonitoring.
2005No recent preprints or news reported in the last 6-12 months.
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