Trial Outcomes & Findings for Percutaneous Auricular Neuromodulation for Postoperative Analgesia (NCT NCT05521516)

NCT ID: NCT05521516

Last Updated: 2025-03-04

Results Overview

The numeric rating scale is a 0-10 Likert scale measuring pain level with 0 = no pain and 10 = worst imaginable pain scale. The outcome will the mean value of daily average pain scores measured with the Numeric Rating Scale. The primary outcome measure will be the mean value of the average daily pain measured on postoperative days 1-5.

Recruitment status

COMPLETED

Study phase

NA

Target enrollment

122 participants

Primary outcome timeframe

The first 5 postoperative days

Results posted on

2025-03-04

Participant Flow

Participant milestones

Participant milestones
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Overall Study
STARTED
61
61
Overall Study
COMPLETED
60
60
Overall Study
NOT COMPLETED
1
1

Reasons for withdrawal

Reasons for withdrawal
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Overall Study
Withdrawal by Subject
1
1

Baseline Characteristics

Race and Ethnicity were not collected from any participant.

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Total
n=120 Participants
Total of all reporting groups
Age, Continuous
61 years
STANDARD_DEVIATION 15 • n=60 Participants
62 years
STANDARD_DEVIATION 15 • n=60 Participants
61 years
STANDARD_DEVIATION 15 • n=120 Participants
Sex: Female, Male
Female
32 Participants
n=60 Participants
33 Participants
n=60 Participants
65 Participants
n=120 Participants
Sex: Female, Male
Male
28 Participants
n=60 Participants
27 Participants
n=60 Participants
55 Participants
n=120 Participants
Race and Ethnicity Not Collected
0 Participants
Race and Ethnicity were not collected from any participant.
Region of Enrollment
United States
60 participants
n=60 Participants
60 participants
n=60 Participants
120 participants
n=120 Participants
Weight
79 kg
STANDARD_DEVIATION 17 • n=60 Participants
78 kg
STANDARD_DEVIATION 16 • n=60 Participants
78 kg
STANDARD_DEVIATION 16 • n=120 Participants
Height
170 cm
STANDARD_DEVIATION 11 • n=60 Participants
170 cm
STANDARD_DEVIATION 11 • n=60 Participants
170 cm
STANDARD_DEVIATION 11 • n=120 Participants
Body Mass Index
27 kg / m^2
STANDARD_DEVIATION 5 • n=60 Participants
27 kg / m^2
STANDARD_DEVIATION 5 • n=60 Participants
27 kg / m^2
STANDARD_DEVIATION 5 • n=120 Participants

PRIMARY outcome

Timeframe: The first 5 postoperative days

The numeric rating scale is a 0-10 Likert scale measuring pain level with 0 = no pain and 10 = worst imaginable pain scale. The outcome will the mean value of daily average pain scores measured with the Numeric Rating Scale. The primary outcome measure will be the mean value of the average daily pain measured on postoperative days 1-5.

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
AVERAGE Pain Measured With the Numeric Rating Scale First 5 Postoperative Days
1 units on a scale
Interval 0.0 to 3.0
3 units on a scale
Interval 1.0 to 4.0

PRIMARY outcome

Timeframe: Postoperative days 0-5

Total opioid consumption from recovery room discharge until the data collection phone call on postoperative day 5 (measured in oral oxycodone equivalents).

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Total OPIOID Consumption From Recovery Room Discharge Until the Data Collection Phone Call on Postoperative Day 5 (Measured in Oral Oxycodone Equivalents)
5 mg
Interval 0.0 to 22.5
17.5 mg
Interval 0.0 to 60.0

SECONDARY outcome

Timeframe: Recorded on postoperative days 1-8 for the previous 24-hour period

The numeric rating scale is a 0-10 Likert scale measuring pain level with 0 = no pain and 10 = worst imaginable pain scale

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
AVERAGE Pain Measured With the Numeric Rating Scale
Day 1
2.3 units on a scale
Standard Deviation 2
2.8 units on a scale
Standard Deviation 2.3
AVERAGE Pain Measured With the Numeric Rating Scale
Day 2
1.9 units on a scale
Standard Deviation 2.2
3.3 units on a scale
Standard Deviation 2.4
AVERAGE Pain Measured With the Numeric Rating Scale
Day 3
1.8 units on a scale
Standard Deviation 2.1
3 units on a scale
Standard Deviation 2.5
AVERAGE Pain Measured With the Numeric Rating Scale
Day 4
1.5 units on a scale
Standard Deviation 1.8
2.7 units on a scale
Standard Deviation 2
AVERAGE Pain Measured With the Numeric Rating Scale
Day 5
1.5 units on a scale
Standard Deviation 1.6
2.5 units on a scale
Standard Deviation 1.9
AVERAGE Pain Measured With the Numeric Rating Scale
Day 6
1.5 units on a scale
Standard Deviation 1.6
2.3 units on a scale
Standard Deviation 1.9
AVERAGE Pain Measured With the Numeric Rating Scale
Day 7
1.5 units on a scale
Standard Deviation 1.6
2.1 units on a scale
Standard Deviation 1.9
AVERAGE Pain Measured With the Numeric Rating Scale
Day 8
1.6 units on a scale
Standard Deviation 1.9
1.8 units on a scale
Standard Deviation 1.8

SECONDARY outcome

Timeframe: Recorded on postoperative days 1-8 for the previous 24-hour period

The numeric rating scale is a 0-10 Likert scale measuring pain level with 0 = no pain and 10 = worst imaginable pain scale

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
WORST (Highest or Maximum) Pain Measured With the Numeric Rating Scale
Day 1
4.3 units on a scale
Standard Deviation 2.5
4.9 units on a scale
Standard Deviation 2.8
WORST (Highest or Maximum) Pain Measured With the Numeric Rating Scale
Day 2
4 units on a scale
Standard Deviation 3
5.5 units on a scale
Standard Deviation 2.8
WORST (Highest or Maximum) Pain Measured With the Numeric Rating Scale
Day 3
3.7 units on a scale
Standard Deviation 2.9
4.9 units on a scale
Standard Deviation 2.6
WORST (Highest or Maximum) Pain Measured With the Numeric Rating Scale
Day 4
3 units on a scale
Standard Deviation 2.5
4.4 units on a scale
Standard Deviation 2.4
WORST (Highest or Maximum) Pain Measured With the Numeric Rating Scale
Day 5
3.1 units on a scale
Standard Deviation 2.6
4.1 units on a scale
Standard Deviation 2.6
WORST (Highest or Maximum) Pain Measured With the Numeric Rating Scale
Day 6
3.1 units on a scale
Standard Deviation 2.7
4 units on a scale
Standard Deviation 2.6
WORST (Highest or Maximum) Pain Measured With the Numeric Rating Scale
Day 7
3 units on a scale
Standard Deviation 2.7
3.8 units on a scale
Standard Deviation 2.8
WORST (Highest or Maximum) Pain Measured With the Numeric Rating Scale
Day 8
2.9 units on a scale
Standard Deviation 3.1
3.2 units on a scale
Standard Deviation 2.4

SECONDARY outcome

Timeframe: Recorded on postoperative days 2, 4, 6, and 8 for the previous 24-hour period

The numeric rating scale is a 0-10 Likert scale measuring pain level with 0 = no pain and 10 = worst imaginable pain scale

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
LEAST (Lowest or Minimum) Pain Measured With the Numeric Rating Scale
Day 2
1 units on a scale
Standard Deviation 1.6
1.8 units on a scale
Standard Deviation 1.9
LEAST (Lowest or Minimum) Pain Measured With the Numeric Rating Scale
Day 4
.7 units on a scale
Standard Deviation 1.3
1.2 units on a scale
Standard Deviation 1.5
LEAST (Lowest or Minimum) Pain Measured With the Numeric Rating Scale
Day 6
.6 units on a scale
Standard Deviation 1.2
1.2 units on a scale
Standard Deviation 1.5
LEAST (Lowest or Minimum) Pain Measured With the Numeric Rating Scale
Day 8
.6 units on a scale
Standard Deviation 1.2
.9 units on a scale
Standard Deviation 1.3

SECONDARY outcome

Timeframe: Recorded on postoperative days 2, 4, 6, and 8

The numeric rating scale is a 0-10 Likert scale measuring pain level with 0 = no pain and 10 = worst imaginable pain scale

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
CURRENT Pain at the Time of the Data-collection Phone Call Measured With the Numeric Rating Scale
Day 2
1.5 units on a scale
Standard Deviation 2
3 units on a scale
Standard Deviation 2.6
CURRENT Pain at the Time of the Data-collection Phone Call Measured With the Numeric Rating Scale
Day 4
1.3 units on a scale
Standard Deviation 1.8
2 units on a scale
Standard Deviation 1.9
CURRENT Pain at the Time of the Data-collection Phone Call Measured With the Numeric Rating Scale
Day 6
1.3 units on a scale
Standard Deviation 1.9
1.9 units on a scale
Standard Deviation 2
CURRENT Pain at the Time of the Data-collection Phone Call Measured With the Numeric Rating Scale
Day 8
1.2 units on a scale
Standard Deviation 1.8
1.6 units on a scale
Standard Deviation 1.9

SECONDARY outcome

Timeframe: Recorded on postoperative days 1-8

Opioid consumption of the previous 24 hours (measured in oral oxycodone equivalents)

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Opioid Consumption of the Previous 24 Hours (Measured in Oral Oxycodone Equivalents)
Day 7
3 mg
Standard Deviation 6.5
4 mg
Standard Deviation 9
Opioid Consumption of the Previous 24 Hours (Measured in Oral Oxycodone Equivalents)
Day 1
4.5 mg
Standard Deviation 8
8 mg
Standard Deviation 11.5
Opioid Consumption of the Previous 24 Hours (Measured in Oral Oxycodone Equivalents)
Day 2
6 mg
Standard Deviation 10
8 mg
Standard Deviation 12
Opioid Consumption of the Previous 24 Hours (Measured in Oral Oxycodone Equivalents)
Day 3
5 mg
Standard Deviation 10
8 mg
Standard Deviation 12
Opioid Consumption of the Previous 24 Hours (Measured in Oral Oxycodone Equivalents)
Day 4
4 mg
Standard Deviation 7.5
7.5 mg
Standard Deviation 12.5
Opioid Consumption of the Previous 24 Hours (Measured in Oral Oxycodone Equivalents)
Day 5
3 mg
Standard Deviation 5.5
7 mg
Standard Deviation 11.5
Opioid Consumption of the Previous 24 Hours (Measured in Oral Oxycodone Equivalents)
Day 6
2.5 mg
Standard Deviation 6
5 mg
Standard Deviation 9
Opioid Consumption of the Previous 24 Hours (Measured in Oral Oxycodone Equivalents)
Day 8
3.5 mg
Standard Deviation 8
4 mg
Standard Deviation 8

SECONDARY outcome

Timeframe: Recorded on postoperative days 2, 4, 6, and 8 for the previous 24-hour period

The interference sub scale of the Brief Pain Inventory short form is an instrument specifically designed to assess pain's impact on physical and emotional functioning. It is comprised of 7 questions involving physical and emotional functioning using a 0-10 Likert scale \[0=no interference, good;10=complete interference, bad\]: general activity, mood, walking ability, normal work, relations with other people, sleep and enjoyment of life. The responses for these 7 questions are summed, resulting in a final scale of 0 (no interference=good) to 70 (complete interference=bad).

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Brief Pain Inventory, Short Form (Interference Subscale)
Day 2
14 score on a scale
Standard Deviation 17
23 score on a scale
Standard Deviation 20
Brief Pain Inventory, Short Form (Interference Subscale)
Day 4
11 score on a scale
Standard Deviation 15
18 score on a scale
Standard Deviation 17
Brief Pain Inventory, Short Form (Interference Subscale)
Day 6
12 score on a scale
Standard Deviation 17
17 score on a scale
Standard Deviation 17
Brief Pain Inventory, Short Form (Interference Subscale)
Day 8
9 score on a scale
Standard Deviation 14
13 score on a scale
Standard Deviation 16

SECONDARY outcome

Timeframe: Recorded on postoperative days 1-8 for the previous night

The number of times the participant awoke the previous night due to pain

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Awakenings Due to Pain
Day 1
0 number of awakenings
Interval 0.0 to 0.0
0 number of awakenings
Interval 0.0 to 0.0
Awakenings Due to Pain
Day 2
0 number of awakenings
Interval 0.0 to 1.0
0 number of awakenings
Interval 0.0 to 1.0
Awakenings Due to Pain
Day 3
0 number of awakenings
Interval 0.0 to 0.0
0 number of awakenings
Interval 0.0 to 0.8
Awakenings Due to Pain
Day 4
0. number of awakenings
Interval 0.0 to 0.5
0 number of awakenings
Interval 0.0 to 1.0
Awakenings Due to Pain
Day 5
0 number of awakenings
Interval 0.0 to 0.0
0 number of awakenings
Interval 0.0 to 0.3
Awakenings Due to Pain
Day 6
0 number of awakenings
Interval 0.0 to 0.0
0 number of awakenings
Interval 0.0 to 1.0
Awakenings Due to Pain
Day 7
0 number of awakenings
Interval 0.0 to 0.0
0 number of awakenings
Interval 0.0 to 0.0
Awakenings Due to Pain
Day 8
0 number of awakenings
Interval 0.0 to 0.0
0 number of awakenings
Interval 0.0 to 1.0

SECONDARY outcome

Timeframe: Recorded on postoperative day 1

Patient queried if they thought they received active stimulation (entered as "1"), a sham device (entered as "0"), or are not sure (entered as "0.5")

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Masking
.5 score on a scale
Interval 0.5 to 1.0
.5 score on a scale
Interval 0.5 to 1.0

SECONDARY outcome

Timeframe: Up to 2 weeks after surgery

Day relative to the day of surgery that patient was discharged from the hospital (e.g., same day is postoperative day 0, while the day following surgery is postoperative day 1)

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Hospitalization Duration Measured in Days
.2 Days
Standard Deviation .5
.5 Days
Standard Deviation .8

SECONDARY outcome

Timeframe: Intraoperative (within the operating room)

Number of minutes the tourniquet was inflated

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Tourniquet Duration
.8 Minutes
Standard Deviation 4.4
1.8 Minutes
Standard Deviation 9.5

SECONDARY outcome

Timeframe: Intraoperative (within the operating room)

The time from surgical start to surgical stop measured in minutes and hours

Outcome measures

Outcome measures
Measure
Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge
n=60 Participants
Application of 5 days of percutaneous auricular Neuromodulation with NSS-2 Bridge device Active Percutaneous Auricular Neuromodulation with NSS-2 Bridge: Application of 5 days of percutaneous auricular neuromodulation with NSS-2 Bridge device
Sham Treatment
n=60 Participants
Application of 5 days of a nonfunctional sham device Sham Treatment: Application of 5 days of a nonfunctional sham device
Surgical Duration
92.4 minutes
Standard Deviation 41.5
89.3 minutes
Standard Deviation 35.9

Adverse Events

Active Percutaneous Auricular Neuromodulation With NSS-2 Bridge

Serious events: 0 serious events
Other events: 0 other events
Deaths: 0 deaths

Sham Treatment

Serious events: 0 serious events
Other events: 0 other events
Deaths: 0 deaths

Serious adverse events

Adverse event data not reported

Other adverse events

Adverse event data not reported

Additional Information

Brian Ilfeld, MD, MS

University of California San Diego

Phone: (858) 220-5714

Results disclosure agreements

  • Principal investigator is a sponsor employee
  • Publication restrictions are in place