Comparing Train-of-Four Recovery in the Adductor Pollicis Versus the Adductor Digiti Minimi in Elective Surgery Patients

Last updated: January 9, 2026
Sponsor: University of North Carolina, Chapel Hill
Overall Status: Completed

Phase

N/A

Condition

Anesthesia

Treatment

EMG Assessement of Recovery of Neuromuscular Function

Clinical Study ID

NCT06467448
24-1013
  • Ages > 18
  • All Genders

Study Summary

The train-of-four (TOF) ratio is a quantitative measure used in anesthesia to assess the degree of neuromuscular blockade induced by neuromuscular blocking agents during surgical procedures. Current American Society of Anesthesiologists guidelines recommend monitoring the TOF ratio to guide the administration and reversal of NMBAs, with a target ratio of 0.9 or higher at adductor pollicis muscle indicating adequate reversal and restoration of neuromuscular function.

This proposed study aims to observe and compare the TOF ratio between two different muscles of the hand: adductor pollicis and adductor digiti minim using anesthesia monitors on both of their arms during recovery of neuromuscular function. Surgery and anesthesia will occur per standard of care.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • Surgery and general anesthesia with administration of non depolarizing neuromuscularblocking drug

Exclusion

Exclusion Criteria:

  • neuromuscular disease or weakness of one of upper limbs.

  • Inability to use one of subjects arms to record neuromuscular monitor.

  • Contraindication to administration or allergy to non depolarizing neuromuscularblocking drug.

Study Design

Total Participants: 57
Treatment Group(s): 1
Primary Treatment: EMG Assessement of Recovery of Neuromuscular Function
Phase:
Study Start date:
March 18, 2024
Estimated Completion Date:
June 01, 2025

Study Description

The study population will enroll adult patients (>18) who will receive non-depolarizing neuromuscular blocking drugs as part of a routine general anesthetic and who will have monitoring of their recovery from neuromuscular block performed using the Tetragraph (Senzime Sweden). Patients with upper limb weakness, neurological deficits, and inability to use the other arm to record the second EMG recording will be excluded.

Procedures (methods):

Adult patients undergoing general anesthesia with the use of muscle relaxants will have anesthesia monitors on both of their arms. On one arm, the study sticky pad will be placed on the forearm and over the base of the little finger. On the other arm, the standard monitor is placed on the forearm and over the base of the thumb.

To identify pre-operative patients, an EPIC report will be utilized to screen for eligible participants. Patients will be contacted via phone by a research team member the day before their procedure and enrolled. Informed consent will be formally obtained on the day of the procedure.

Connect with a study center

  • University of North Carolina at Chapel Hill

    Chapel Hill, North Carolina 27599
    United States

    Site Not Available

  • University of North Carolina at Chapel Hill

    Chapel Hill 4460162, North Carolina 4482348 27599
    United States

    Site Not Available

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