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FOT Assessment of Hemi-diaphragm Dysfunction After Upper Extremity Nerve Blocks

NCT04005235 · Status: TERMINATED · Type: OBSERVATIONAL · Enrollment: 19

Last updated 2021-04-19

No results posted yet for this study

Summary

Upper extremity nerve blocks of the brachial plexus using local anesthetic can inadvertently affect the ipsilateral phrenic nerve and result in hemidiaphragm dysfunction. Ultrasonography is often used to assess for hemidiaphragm dysfunction after brachial plexus nerve blocks. Alternately, post-operative chest x-rays can also be used to document unilateral hemidiaphragm elevation secondary to phrenic nerve dysfunction. Newly developed passive breathing testing devices (Forced Oscillometry Technique - FOT) use small composite pressure waveforms (5-37Hz) imposed on top of normal breathing and measure the resulting reflected oscillations to assess the mechanical properties of the lungs. The lung resistance R(f) and reactance X(f) are automatically mathematically derived from the reflected pressure waveforms returning from the respiratory system to the FOT device. In this study, we will assess if FOT can be used to detect changes in lung mechanics (lung resistance R(f) and reactance X(f)) after ultrasound proven hemidiaphragm dysfunction secondary to brachial plexus nerve block.

Conditions

  • Diaphragm Elevated
  • Paresis

Interventions

DEVICE

Thorasys Tremoflo C-100 Airwave Oscillometry System (FOT)

Ultrasonography will be used to confirm hemidiaphragm dysfunction after brachial plexus nerve block. In subjects with U/S confirmed hemidiaphragm dysfunction, FOT measurements will be taken before and after nerve block and post-operatively after upper extremity surgery.

Sponsors & Collaborators

  • Nova Scotia Health Authority

    lead OTHER

Principal Investigators

  • Andrew Mine · Staff

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2019-07-31
Primary Completion
2020-03-12
Completion
2020-03-12
FDA Device
Yes

Countries

  • Canada

Study Locations

More Related Trials

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04005235 on ClinicalTrials.gov