Realizzazione di una normativa per la registrazionedei Potenziali Evocati Miogenici Vestibolari (VEMPs)con Amplaid MK22
Notice bibliographique
Résumé
The term VEMPs (Vestibular Evoked Myogenic Potentials) means a muscular potential evoked at the sternocleidomastoideus muscle (SCM) following an intense acoustic stimulation, through the activation of vestibular receptor structures. This is called vestibulocollic reflex. It is believed that the Vemps are due to a disynaptic reflex arc that consists of otolitic receptors, saccular mainly, vestibular nuclei (1st synapse), spinal motoneurons (2nd synapse) and the SCM. These potentials, recorded as undulatory fluctuations compared to the isoelettric signal, are characterized by a biphasic complex called p1-n1 (or p13-N23) that appears within 30 ms from stimulus. The presence of this complex indicates the integrity of the reflex, especially of the lower branch of the vestibular nerve. Currently the only parameter on which to rely in vestibular diagnostics are the p1 and n1 latencies with the presence/absence of the potential. Other waves have been identified as the p2-n2 (or p34-N44) that probably derive from cochlear afferences, but these being so fickle these are useless. The purpose of our experiment was to obtain normative reference values for the apparatus responsible for the registration of these potentials at the Operative Unit of Audiology of Ferrara, in this case it is an Amplaid MK22 commonly used in recording evoked potentials. The p1-n1 complex was examined in 50 normally-hearing volunteer adults aged between 19 and 32 years (average 23.4), with stapedial reflexes present bilaterally and without history of dizziness. The acoustic stimulus used was a 500 Hz logon with a duration of 10 msec, with a repetition frequency of 4/sec and with an intensity of 130 dB SPL presented monaural or binaural via air conduction. The term VEMPs (Vestibular Evoked Myogenic Potentials) means a muscular potential evoked at the sternocleidomastoideus muscle (SCM) following an intense acoustic stimulation, through the activation of vestibular receptor structures. This is called vestibulocollic reflex. It is believed that the Vemps are due to a disynaptic reflex arc that consists of otolitic receptors, saccular mainly, vestibular nuclei (1st synapse), spinal motoneurons (2nd synapse) and the SCM. These potentials, recorded as undulatory fluctuations compared to the isoelettric signal, are characterized by a biphasic complex called p1-n1 (or p13-N23) that appears within 30 ms from stimulus. The presence of this complex indicates the integrity of the reflex, especially of the lower branch of the vestibular nerve. Currently the only parameter on which to rely in vestibular diagnostics are the p1 and n1 latencies with the presence/absence of the potential. Other waves have been identified as the p2-n2 (or p34-N44) that probably derive from cochlear afferences, but these being so fickle these are useless. The purpose of our experiment was to obtain normative reference values for the apparatus responsible for the registration of these potentials at the Operative Unit of Audiology of Ferrara, in this case it is an Amplaid MK22 commonly used in recording evoked potentials. The p1-n1 complex was examined in 50 normally-hearing volunteer adults aged between 19 and 32 years (average 23.4), with stapedial reflexes present bilaterally and without history of dizziness. The acoustic stimulus used was a 500 Hz logon with a duration of 10 msec, with a repetition frequency of 4/sec and with an intensity of 130 dB SPL presented monaural or binaural via air conduction. The term VEMPs (Vestibular Evoked Myogenic Potentials) means a muscular potential evoked at the sternocleidomastoideus muscle (SCM) following an intense acoustic stimulation, through the activation of vestibular receptor structures. This is called vestibulocollic reflex. It is believed that the Vemps are due to a disynaptic reflex arc that consists of otolitic receptors, saccular mainly, vestibular nuclei (1st synapse), spinal motoneurons (2nd synapse) and the SCM. These potentials, recorded as undulatory fluctuations compared to the isoelettric signal, are characterized by a biphasic complex called p1-n1 (or p13-N23) that appears within 30 ms from stimulus. The presence of this complex indicates the integrity of the reflex, especially of the lower branch of the vestibular nerve. Currently the only parameter on which to rely in vestibular diagnostics are the p1 and n1 latencies with the presence/absence of the potential. Other waves have been identified as the p2-n2 (or p34-N44) that probably derive from cochlear afferences, but these being so fickle these are useless. The purpose of our experiment was to obtain normative reference values for the apparatus responsible for the registration of these potentials at the Operative Unit of Audiology of Ferrara, in this case it is an Amplaid MK22 commonly used in recording evoked potentials. The p1-n1 complex was examined in 50 normally-hearing volunteer adults aged between 19 and 32 years (average 23.4), with stapedial reflexes present bilaterally and without history of dizziness. The acoustic stimulus used was a 500 Hz logon with a duration of 10 msec, with a repetition frequency of 4/sec and with an intensity of 130 dB SPL presented monaural or binaural via air conduction. The results showed the costant presence of the complex p1-n1 while the complex p2-n2 is present only in a small percentage of subjects. The p1 and n1 latencies and the p1-n1 complex width reproduce faithfully in the same subject, while there is a more obvious interindividual difference regarding the p1-n1 width than for the p1 and n1 latencies.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,051 | 0,053 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,001 |
| Bibliométrie | 0,002 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,002 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,001 | 0,003 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,003 | 0,002 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».