CClinicalTrials.gg
CompletedNCT01895062Updated Aug 6, 2014Results posted

Effectiveness of Continuous Negative External Pressure in Preventing Upper Airway Impairment During Routine Colonoscopy

A Phase 1/2 interventional study of Airway Management System (AMS) in Airway Obstruction, Apnea and Hypopnea, sponsored by 5i Sciences, Inc.. Completed at 1 site in United States. Open to participants aged 18 Years to 80 Years. Per ClinicalTrials.gov, last updated 2014-08-06.

Sponsored by 5i Sciences, Inc. · Phase 1/2, Interventional, and Prevention

Phase
Phase 1/2
Study type
Interventional
Enrollment
54
Allocation
Randomized
Ages
18 Years to 80 Years
Sex
All
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Study summary

The primary goal of this study is to determine the effectiveness and safety of delivering continuous negative external pressure (cNEP) to the upper airway as a means of preventing episodes of respiratory impairment (RI) such as hypoxemia, apnea and hypoventilation associated with the use of intravenous sedation in elective colonoscopy in adult patients.

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Conditions studied

  • Airway Obstruction
  • Apnea
  • Hypopnea

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Keywords

  • colonoscopy
  • oxygen desaturation
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In context

Airway Obstruction

154 studies on the registry are indexed under Airway Obstruction; 30 are open to participants now.

This study's enrollment of 54 is close to the median of 56 across 92 interventional studies indexed under Airway Obstruction.

Browse Airway Obstruction studies →

Lead sponsor

This is the only study on the registry with 5i Sciences, Inc. as lead sponsor.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years to 80 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Male or female subjects undergoing elective colonoscopy at the Study Site who have fewer than three or more than three positive responses on the STOP BANG questionnaire

Exclusion criteria

Exclusion Criteria:

  • Presence of severe cardiopulmonary or neurologic disease as determined by the investigator
  • History of vascular fragility associated with cutaneous pressure
  • History of hypersensitivity to silicone
  • Inability to properly fit cNEP collar to the subject
  • The presence of excessive facial hair in the region where the cNEP collar is positioned
  • Known carotid vascular disease, previous major neck surgery or radiation therapy to the cervical region
  • Presence of anatomical abnormalities in the neck or pharyngeal region (such as enlarged tonsils)
  • Inability to provide informed consent
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Study design

Phase
Phase 1 / Phase 2
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Triple (Participant, Care provider, Investigator)
Enrollment
54 participants (actual)

Study arms

  • Experimental
    active cNEP @ -45cmw

    cNEP @ -45 cmw is applied to the anterior surface of the neck with a soft collar attached to a vacuum source.

    Device: Airway Management System (AMS)

  • No intervention
    no intervention

    Routine care is administered without the application of cNEP.

Interventions

  • DeviceAirway Management System (AMS)

    The AMS consists of a silicone collar applied under the mandible to the anterior surface of the neck. The collar is attached to a vacuum source which delivers continuous negative external pressure to the upper airway.

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What researchers measure

Primary outcomes

  1. RI Events in the cNEP Group Compared to the no cNEP Group, Where RI is Defined as Either: i Oxygen Saturation < 90% or ii. Apneas/Hypopneas of > 15 Sec Duration i. Oxygen Saturation <90% ii. Presence of Apneas or Hypopneas

    Mean RI events in the no cNEP group was 3.5 compared to 1.92 in the cNEP group (p=0.022)

    Time frame: 1 hour

Secondary outcomes

  1. The Safety of cNEP as Determined by Adverse Events Reported by the Investigators.

    Time frame: 1 hour

  2. The Incidence of Subjects With One or More RI in the cNEP Group Compared to the no cNEP Group.

    Time frame: 1 hour

  3. The Frequency of Interventions to Alleviate RI in the cNEP Group Compared to the no cNEP Group.

    interventions such as reduction of sedative medication or jaw thrust.

    Time frame: 1 hour

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Results

Posted Aug 6, 2014

Participant flow

Participant flow — Overall Study
MilestoneActive cNEP @ -45cmwno Intervention
Started3024
Completed3024
Not completed00

Outcome measures

PrimaryRI Events in the cNEP Group Compared to the no cNEP Group, Where RI is Defined as Either: i Oxygen Saturation < 90% or ii. Apneas/Hypopneas of > 15 Sec Duration i. Oxygen Saturation <90% ii. Presence of Apneas or Hypopneas

Mean RI events in the no cNEP group was 3.5 compared to 1.92 in the cNEP group (p=0.022)

Time frame:
1 hour
Reported as:
Mean · RI events
RI Events in the cNEP Group Compared to the no cNEP Group, Where RI is Defined as Either: i Oxygen Saturation < 90% or ii. Apneas/Hypopneas of > 15 Sec Duration i. Oxygen Saturation <90% ii. Presence of Apneas or Hypopneas
RI eventsActive cNEP @ -45cmwno Intervention
RI Events in the cNEP Group Compared to the no cNEP Group, Where RI is Defined as Either: i Oxygen Saturation < 90% or ii. Apneas/Hypopneas of > 15 Sec Duration i. Oxygen Saturation <90% ii. Presence of Apneas or Hypopneas1.92 (1.1 to 2.75)3.5 (2.37 to 4.64)
Statistical analysis
  • Active cNEP @ -45cmw vs no Intervention · t-test, 2 sided · p = <0.022
SecondaryThe Safety of cNEP as Determined by Adverse Events Reported by the Investigators.
Time frame:
1 hour

Results for this outcome have not been posted.

SecondaryThe Incidence of Subjects With One or More RI in the cNEP Group Compared to the no cNEP Group.
Time frame:
1 hour

Results for this outcome have not been posted.

SecondaryThe Frequency of Interventions to Alleviate RI in the cNEP Group Compared to the no cNEP Group.

interventions such as reduction of sedative medication or jaw thrust.

Time frame:
1 hour
Reported as:
Number · interventions to restore airway
The Frequency of Interventions to Alleviate RI in the cNEP Group Compared to the no cNEP Group.
interventions to restore airwayActive cNEP @ -45cmwno Intervention
The Frequency of Interventions to Alleviate RI in the cNEP Group Compared to the no cNEP Group.10

Adverse events

Non-serious events are listed at a 2% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Active cNEP @ -45cmw—0/30 (0%)0/30 (0%)
no Intervention—0/24 (0%)0/24 (0%)

Baseline characteristics

The number of participants in the cNEP group was estimated from the number required to show a 50% decrease in the primary endpoint compared to the no intervention group.

Age, Continuous
Age, Continuous(years)Active cNEP @ -45cmwno InterventionTotal
Mean60 (33 to 78)60 (34 to 77)60 (33 to 78)
Age, Categorical
Age, Categorical(Participants)Active cNEP @ -45cmwno InterventionTotal
<=18 years000
Between 18 and 65 years221840
>=65 years8614
Sex: Female, Male
Sex: Female, Male(Participants)Active cNEP @ -45cmwno InterventionTotal
Female18927
Male121527
Region of Enrollment
Region of Enrollment(participants)Active cNEP @ -45cmwno InterventionTotal
United States302454
History of sleep apnea
History of sleep apnea(participants)Active cNEP @ -45cmwno InterventionTotal
Number224
08

Study locations

1 site
  • Scripps Green Clinic
    La Jolla, California 92037, United States
09

References and documents

Publications

  • Kais SS, Klein KB, Rose RM, Endemann S, Coyle WJ. Continuous negative external pressure (cNEP) reduces respiratory impairment during screening colonoscopy: a pilot study. Endoscopy. 2016 Jun;48(6):584-7. doi: 10.1055/s-0042-102533. Epub 2016 Apr 25. PubMed 27110692 ↗
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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Aug 6, 2014, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT01895062
Lead sponsor
5i Sciences, Inc.
Responsible party
Sponsor
First posted
Jul 10, 2013
Start date
Mar 2013
Primary completion
Mar 2014
Completion
Mar 2014
Results posted
Aug 6, 2014
Last update
Aug 6, 2014

Study contacts

Walter Coyle, M.D.
principal investigator · Scripps Healthcare

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

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