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The Response Patterns to the Electrical Stimulation of Epidural Catheters With Varying Pulse Widths in Term Pregnant Women

31 luglio 2017 aggiornato da: Samuel Lunenfeld Research Institute, Mount Sinai Hospital

Epidural analgesia is commonly used for labor pain relief due to its safety and effectiveness. Despite a very high success rate, the epidural technique remains a somewhat blind technique and failures continue to occur. Unfortunately, there are no imaging techniques that can be used at the bedside to determine the proper positioning of the epidural catheter. The trans-catheter electric stimulation test (TCEST) has been successfully used for this purpose. This test is occasionally performed in situations where the immediate confirmation of the proper epidural catheter location is deemed necessary. The test helps to predict which epidurals might fail so that appropriate measures could be immediately implemented.

There has been one duration of electrical stimulus (0.2 milliseconds) that has been used in the majority of studies and in clinical practice. With this duration of stimulation, the vast majority of cases show a unilateral motor response of the lower limbs during the TCEST. Studies on the stimulation of peripheral nerves (nerves in the arms and legs) have shown that an electrical stimulus with a longer duration is able to stimulate nerves which are farther away. Since nerves in the epidural space are similar in composition to peripheral nerves, the investigators expect to see a higher rate of bilateral response with the longer duration of stimulus. The investigators also hope to show that this bilateral response is predictive of a better functioning epidural.

The investigators hypothesize that the incidence of a bilateral response to the TCEST will be higher with the 1.0 ms pulse width compared to 0.1 ms pulse width. Furthermore, the investigators hypothesize that a bilateral motor response associated with the 1.0 ms pulse width will be predictive of symmetry of sensory and motor block and of lower consumption of local anesthetic.

Panoramica dello studio

Stato

Terminato

Condizioni

Intervento / Trattamento

Descrizione dettagliata

This will be a randomized double-blind controlled study. After recruitment of the patient, epidural anesthesia will be performed in the standard fashion employed in the investigators' institution by a fellow or staff. Spinal ultrasound will be used prior to performing the epidural catheter insertion. The trans-catheter electric stimulation test (TCEST) will be performed at both a 0.1ms pulse width and a 1ms pulse width. The order in which the two pulse widths are applied will be randomly decided by computer. The test dose of local anesthetic will then be administered, and the TCEST will be repeated 5 minutes later. Again, both pulse widths (0.1ms, 1ms) will be used, and the order in which they are applied will be decided randomly.

Following the second testing, a loading dose of the standard anesthetic solution will be administered. The sensory level to ice will be tested at 20 minutes following injection of the loading dose of bupivacaine and fentanyl. The sensory level will be assessed from the sacral to the thoracic levels, bilaterally. The motor response pattern will be recorded for all TCESTs performed, and any relationship between pulse width and response pattern will be determined.

Tipo di studio

Interventistico

Iscrizione (Effettivo)

20

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Canada
    • Ontario
      • Toronto, Ontario, Canada, M5G1X5
        • Mount Sinai Hospital

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

Da 16 anni a 55 anni (Bambino, Adulto)

Accetta volontari sani

No

Sessi ammissibili allo studio

Femmina

Descrizione

Inclusion Criteria:

  • Women 16 years of age and older requesting an epidural for labour analgesia
  • Ability to communicate in English
  • Informed consent

Exclusion criteria:

  • Refusal to provide written informed consent
  • Inability to communicate in English
  • Abnormal vertebral anatomy, including but not limited to previous spine surgery and scoliosis
  • Allergy or hypersensitivity to lidocaine, bupivacaine or fentanyl
  • Coexisting neurological disorders
  • Implanted electronic devices

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Doppio

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Comparatore attivo: 0.1ms pulse width
The nerve stimulator will be connected to the epidural catheter through an adapter, which will be primed with a standard volume of 3 ml of sterile normal saline to allow for effective electrical conduction. The cathode terminal of the stimulator will then be attached to the metal hub of the adapter and the anode terminal will be connected to the electrode placed over the deltoid muscle. All patients will have the trans-catheter electric stimulation test (TCEST) performed with both a 1 ms pulse width and 0.1 ms pulse width and the order of administration will be randomized.
Dispositivo: Nerve stimulator
The nerve stimulator (Stimpod NMS 450: Xavant technology (PTY) Ltd; Pretoria, South Africa or similar nerve stimulator) will be connected to the epidural catheter through an adapter (Johans ECG Adapter, Arrow International Inc., Reading). The epidural catheter and the adapter will be primed with a standard volume of 3 ml of sterile normal saline to allow for effective electrical conduction. Secured connections and avoidance of any air within in the system must be ensured to avoid high impedance in the circuit, which could result in false negatives. The cathode terminal of the stimulator will then be attached to the metal hub of the adapter and the anode terminal will be connected to the electrode placed over the deltoid muscle.
Altri nomi:
  • Stimpod NMS 450
Comparatore attivo: 1ms pulse width
The nerve stimulator will be connected to the epidural catheter through an adapter, which will be primed with a standard volume of 3 ml of sterile normal saline to allow for effective electrical conduction. The cathode terminal of the stimulator will then be attached to the metal hub of the adapter and the anode terminal will be connected to the electrode placed over the deltoid muscle. All patients will have the trans-catheter electric stimulation test (TCEST) performed with both a 1 ms pulse width and 0.1 ms pulse width and the order of administration will be randomized.
Dispositivo: Nerve stimulator
The nerve stimulator (Stimpod NMS 450: Xavant technology (PTY) Ltd; Pretoria, South Africa or similar nerve stimulator) will be connected to the epidural catheter through an adapter (Johans ECG Adapter, Arrow International Inc., Reading). The epidural catheter and the adapter will be primed with a standard volume of 3 ml of sterile normal saline to allow for effective electrical conduction. Secured connections and avoidance of any air within in the system must be ensured to avoid high impedance in the circuit, which could result in false negatives. The cathode terminal of the stimulator will then be attached to the metal hub of the adapter and the anode terminal will be connected to the electrode placed over the deltoid muscle.
Altri nomi:
  • Stimpod NMS 450

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Motor response pattern
Lasso di tempo: 5 minutes
Motor response pattern to the electrical stimulation of the epidural catheter, either unilateral or bilateral.
5 minutes

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Sensory level
Lasso di tempo: 2 hours
The sensory level to ice at 20 minutes and 2 hours following injection of the standard epidural loading dose. The sensory level will be assessed from the sacral to the thoracic levels, bilaterally.
2 hours
Motor block
Lasso di tempo: 2 hours

Lower extremity motor block as assessed by the Bromage score (Range: 0-3) bilaterally at 20 minutes and 2 hours following the loading dose.

0 = No motor block (full flexion of knees and feet)

  1. = Partial motor block (just able to move knees and feet)
  2. = Almost complete motor block (able to move feet only)
  3. = Complete motor block (unable to move feet or knees)
2 hours
Current (mA)
Lasso di tempo: 5 minutes
The current required to elicit a motor response on the initial TCEST and at 5 minutes after the test dose
5 minutes
Consumption of local anesthetic
Lasso di tempo: 2 hours
Amount of local anesthetic consumed as measured on the pump in the first 2 hours.
2 hours
Epidural block failure
Lasso di tempo: 2 hours
Failure of the epidural analgesia, defined as no evidence of a sensory block to ice and absent pain relief in the first 20 minutes, OR the need for epidural catheter replacement within 2 hours of the loading dose.
2 hours

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Samuel Lunenfeld Research Institute, Mount Sinai Hospital

Pubblicazioni e link utili

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Pubblicazioni generali

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Effettivo)

1 maggio 2016

Completamento primario (Effettivo)

1 agosto 2016

Completamento dello studio (Effettivo)

1 agosto 2016

Date di iscrizione allo studio

Primo inviato

2 maggio 2016

Primo inviato che soddisfa i criteri di controllo qualità

3 maggio 2016

Primo Inserito (Stima)

4 maggio 2016

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

1 agosto 2017

Ultimo aggiornamento inviato che soddisfa i criteri QC

31 luglio 2017

Ultimo verificato

1 luglio 2017

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • 16-04

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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