CoughNCT05723159
Clinical Validation of the Hyfe Cough Monitoring System
An observational study of Cough, run by Hyfe Inc at 3 sites in 2 countries.
Trial summary
This is a multicenter observational study and will include individuals with a variety of cough related conditions including but not limited to refractory chronic cough, Chronic Obstructive Pulmonary Disease (COPD) and non-tuberculous mycobacteria. Read more about this study
- Who is it for?
- Ages 21 years and older
- Conditions the study is for
- Cough
- What is being tested?
- Clinical Validation of the Hyfe Cough Monitoring System
- Type of treatment
- Medical device
- How many people
- 21 participants
- Where
- 3 sitesin 2 countries
- Study dates
- 10 Mar 2023to 15 Dec 2023
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 21 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: The study population are adults (21 years old or above) seeking health care and who express concern about their cough.
Who may be able to join
- Age 21 years old or above
- Individuals seeking health care, who express concern about their active cough (problematic cough)
- Anticipate that they can collect auditory recording and keep the devices with them continuously for 24 hours.
- Residing in a domestic environment without unusually high and / or persistent background sound levels .
- Willing to wear a watch an audio recorder and keep them at bedside (within 3 ft) from the mouth during the night.
Who cannot join
- Inability to accept the privacy policy and terms of use of HCMS due to confidentiality or other concerns.
- Inability to avoid unusually prolonged loud environments for the duration of the 24-hour study period.
- Need to conduct confidential conversations during the 24-hour monitoring period
- Individuals who have had significant change in antitussive therapy in the week preceding study.
Trial locations and contacts
3 sites in 2 countries.
3 sites in 2 countries
United States2 sites
Oregon Health Science University
Oregon City, Oregon, 97239
Hyfe North American Clinical Office
Seattle, Washington, 98105
About this study
This is a multicenter observational study and will include individuals with a variety of cough related conditions including but not limited to refractory chronic cough, Chronic Obstructive Pulmonary Disease (COPD) and non-tuberculous mycobacteria.
The primary objective of this study is to assess the overall performance of the Hyfe Cough Monitoring System (HCMS, Hyfe Inc., 2022) when used by individuals with problematic cough, under common living conditions.The monitoring period for outpatients will be 24 hours.
Read the detailed description
Researcher will evaluate the accuracy of the mobile HCMS as a tool to monitor cough. HCMS is a dedicated Android smart watch running specialized software that runs continuously and calculates a patient's cough rate on an hourly basis. After providing informed consent, research subjects will be instructed to wear the HCMS and a second watch serving as an audio recorder. These devices will be kept on the wrist or within 3 feet (~91 cm) of the mouth, a behavior abetted by keeping the charging station for both watches on the bedside table. Participants will be asked to go about their day as usual while wearing these devices.
The subjects will be instructed to not turn off either watch for the duration of the 24 hours. In addition, participants will be instructed to avoid environments with active coughers and to inform others in their environment that sound is being recorded. Additionally, they will be told to avoid getting the watches wet. Participants will be instructed to charge the watches on a nightstand next to the bed while they sleep using the provided watch chargers. At the end of the 24-hour period, participants will be instructed to turn off and remove the watches. Additionally, participants will be given a printed Hyfe diary to write down the exact time when the device was turned on/off and any times the watch was not being worn. The devices will be returned to the researchers once the recording period is complete.The 24 hours of continuous ambient sounds collected by the audio recording watch and will be listened to by Hyfe technicians trained in cough annotation and data security, and each coughwill be annotated on the audio file using audio-analysis software, according to standard operating procedures developed by Hyfe. These results will be compared on an hourly basis with the coughs detected by HCMS and the performance of the HCMS for identifying cough in home settings calculated in comparison to the human annotated continuous recording reported.
- Conditions
- Cough
- Being tested
- Clinical Validation of the Hyfe Cough Monitoring System
- Medical subject headings
- Cough
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Clinical Validation of the Hyfe Cough Monitoring SystemDevice
The subjects will be instructed to not turn off either watch for the duration of the 24 hours. In addition, participants will be instructed to avoid environments with active coughers and to inform others in their environment that sound is being recorded. Additionally, participants will be told to avoid getting the watches wet. Participants will be instructed to charge the watches on a nightstand next to the bed while they sleep using the provided watch chargers. At the end of the 24-hour period, participants will be instructed to turn off and remove the watches. Additionally, participants will be given a printed Hyfe diary to write down the exact time when the device was turned on/off and any times the watch was not being worn. The devices will be returned to the researchers once the recording period is complete.
| Study group | Role | What they receive |
|---|---|---|
| Clínica Universidad Navarra site | Research subjects will be enrolled at Clínica Universidad Navarra. Research subjects will be instructed to wear the HCMS and a second watch serving as an audio recorder. These devices will be kept on the wrist or within 3 feet (~91 cm) of the mouth, a behavior abetted by keeping the charging station for both watches on the bedside table. Participants will be asked to go about their day as usual while wearing these devices. Receives: Device: Clinical Validation of the Hyfe Cough Monitoring System | |
| OHSU site | Research subjects will be enrolled at OHSU. Research subjects will be instructed to wear the HCMS and a second watch serving as an audio recorder. These devices will be kept on the wrist or within 3 feet (~91 cm) of the mouth, a behavior abetted by keeping the charging station for both watches on the bedside table. Participants will be asked to go about their day as usual while wearing these devices. Receives: Device: Clinical Validation of the Hyfe Cough Monitoring System | |
| Decentralized - US-based | Research subjects will be enrolled in a decentralized manner ou of the Hyfe North American Clinical Office.
Research subjects will be instructed to wear the HCMS and a second watch serving as an audio recorder. These devices will be kept on the wrist or within 3 feet (~91 cm) of the mouth, a behavior abetted by keeping the charging station for both watches on the bedside table. Participants will be asked to go about their day as usual while wearing these devices. Receives: Device: Clinical Validation of the Hyfe Cough Monitoring System |
What is being measured
The primary outcome is the main question the study is designed to answer.
Hyfe Cough Monitoring System (HCMS) accuracy using Pearson correlation coefficient
The HCMS timestamps coughs as they occur. Hourly counts of cough events will be compared with ground truth hourly counts determined by trained human annotators, who will listen to audio recordings and timestamp each cough using proprietary labeling software.
If human annotators and the HCMS agreed perfectly, their paired hourly counts would lie on the line y=x (ground truth on the x-axis, HCMS on the y-axis). Agreement with this ideal line quantifies HCMS performance: the Pearson correlation coefficient must be close to 1
By comparison with ground truth annotations, each HCMS timestamp is either a true positive or a false positive; by the usual formula, HCMS Sensitivity = Number of true positives Total number of coughs where the denominator is determined by ground truth.
Measured: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the primary outcome measures.
Hyfe Cough Monitoring System (HCMS) accuracy using OLS slope/intercept
The HCMS timestamps coughs as they occur. Hourly counts of cough events will be compared with ground truth hourly counts determined by trained human annotators, who will listen to audio recordings and timestamp each cough using proprietary labeling software.
If human annotators and the HCMS agreed perfectly, their paired hourly counts would lie on the line y=x (ground truth on the x-axis, HCMS on the y-axis). Agreement with this ideal line quantifies HCMS performance: the slope and intercept of the OLS line of best fit must be close to 1 and 0, respectively.
By comparison with ground truth annotations, each HCMS timestamp is either a true positive or a false positive; by the usual formula
HCMS Sensitivity = Number of true positives Total number of coughs
where the denominator is determined by ground truth.
Measured: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the co-primary outcome measures
Hyfe Cough Monitoring System (HCMS) sensitivity of cough detection
The HCMS timestamps coughs as they occur. Hourly counts of cough events will be compared with ground truth hourly counts determined by trained human annotators, who will listen to audio recordings and timestamp each cough using proprietary labeling software.
By comparison with ground truth annotations, each HCMS timestamp is either a true positive or a false positive; by the usual formula
HCMS Sensitivity = Number of true positives Total number of coughs
where the denominator is determined by ground truth.
Measured: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the co-primary outcome measures.
Hyfe Cough Monitoring System (HCMS) false positivity rate
The HCMS timestamps coughs as they occur. Hourly counts of cough events will be compared with ground truth hourly counts determined by trained human annotators, who will listen to audio recordings and timestamp each cough using proprietary labeling software.
The false positive rate is the total number of false positives divided by the total number of monitoring hours.
Measured: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the co-primary outcome measures.
Secondary outcomes (3)
Differential analysis of nighttime versus daytime HCMS performance
Given the value of monitoring cough only during the day or only at night, a secondary analysis will compare HCMS performance during these periods; "nighttime" is defined as time spent in bed and "daytime" is defined as time not spent in bed. When going to bed, subjects will note their bedtimes carefully and will place the HCMS and monitor in chargers by the bed; reported bedtimes will be validated against the charging times recorded by the watches. The accuracy metrics defined above will then be calculated separately for subjects' daytime and nighttime monitoring periods.
Measured: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours. All of the coughs timestamped by trained human annotators and by the Hyfe Cough Monitoring System will be used to calculate the second
Differential analysis of HCMS performance for individual subjects
HCMS performance will vary from subject to subject; in particular, the HCMS may fail to recognize extremely unusual coughs or may perform differently with challenging acoustic backgrounds. Trained human annotators face similar issues, leading to disputed annotations that will be resolved by a third expert annotator.
To understand the impact of atypical coughers on HCMS performance, the accuracy metrics defined earlier will be calculated separately for each individual participant. The distributions of these accuracy metrics will be investigated and summarized, and a post hoc analysis of audio from those subjects with exceptionally poor performance will be done to determine the causes of degraded performance.
Measured: Each participant will be monitored continuously with the audio recorder and the Hyfe Cough Monitoring System for 24 hours. All of the coughs timestamped by trained human annotators and by the HCMS will be used to calculate the seco
Dependence of HCMS performance on individual cough rates
It is possible that HCMS performance could depend on the frequency with which different subjects cough. To assess the impact of this variable, subjects will be stratified into tertiles according to their average cough rates; a subject's average cough rate is that individual's total number of coughs divided by the number of hours of monitoring. The performance metrics defined above will be calculated separately for these tertiles and compared.
Measured: Each participant will be monitored continuously with the audio recorder and the Hyfe Cough Monitoring System for 24 hours. All of the coughs timestamped by trained human annotators and by the HCMS will be used to calculate the seco
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted10 Feb 2023
- Study start10 Mar 2023
- Primary completion15 Nov 2023 (estimated)
- Study completion15 Dec 2023 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (6)Papers the sponsor has linked to this study.
- Other trials for CoughStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 21 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Hyfe Inc
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Carlos Chaccour, Principal investigator, Clinica Universidad de Navarra, Universidad de Navarra
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05723159
- Sponsor's protocol ID
- Clinical Validation of the CM
- Status last verified
- Sep 2023
- First submitted
- 3 Feb 2023
- Last updated
- 28 Sep 2023
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- Yes
- Individual data sharing
- Yes: All anonymized IPD that support each resulting publication.
Publications
Decalmer SC, Webster D, Kelsall AA, McGuinness K, Woodcock AA, Smith JA. Chronic cough: how do cough reflex sensitivity and subjective assessments correlate with objective cough counts during ambulatory monitoring? Thorax. 2007 Apr;62(4):329-34. doi: 10.1136/thx.2006.067413. Epub 2006 Nov 13.
PubMed 17101736Leconte S, Ferrant D, Dory V, Degryse J. Validated methods of cough assessment: a systematic review of the literature. Respiration. 2011;81(2):161-74. doi: 10.1159/000321231. Epub 2010 Nov 13.
PubMed 21079381Barton A, Gaydecki P, Holt K, Smith JA. Data reduction for cough studies using distribution of audio frequency content. Cough. 2012 Dec 12;8(1):12. doi: 10.1186/1745-9974-8-12.
PubMed 23231789Matos S, Birring SS, Pavord ID, Evans DH. An automated system for 24-h monitoring of cough frequency: the leicester cough monitor. IEEE Trans Biomed Eng. 2007 Aug;54(8):1472-9. doi: 10.1109/TBME.2007.900811.
PubMed 17694868Gabaldon-Figueira JC, Brew J, Dore DH, Umashankar N, Chaccour J, Orrillo V, Tsang LY, Blavia I, Fernandez-Montero A, Bartolome J, Grandjean Lapierre S, Chaccour C. Digital acoustic surveillance for early detection of respiratory disease outbreaks in Spain: a protocol for an observational study. BMJ Open. 2021 Jul 2;11(7):e051278. doi: 10.1136/bmjopen-2021-051278.
PubMed 34215614Chaccour C, Sanchez-Olivieri I, Siegel S, Megson G, Winthrop KL, Botella JB, de-Torres JP, Jover L, Brew J, Kafentzis G, Galvosas M, Rudd M, Small P. Validation and accuracy of the Hyfe cough monitoring system: a multicenter clinical study. Sci Rep. 2025 Jan 6;15(1):880. doi: 10.1038/s41598-025-85341-3.
PubMed 39762316
Study at a glance
From the registry record, last updated by the sponsor on 28 Sep 2023. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Clinical Validation of the Hyfe Cough Monitoring System
- ClinicalTrials.gov ID
- NCT05723159
- Acronym / sponsor ID
- Clinical Validation of the CM
- Conditions
- Cough
- Study type
- Observational
- Recruitment status
- Unknown status
- Enrolment
- 21 participants (estimated)
- Lead sponsor
- Hyfe IncUniversity, hospital or other
- Study start
- 10 Mar 2023 (actual)
- Primary completion
- 15 Nov 2023 (estimated)
- Study completion
- 15 Dec 2023 (estimated)
- First posted
- 10 Feb 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This is a multicenter observational study and will include individuals with a variety of cough related conditions including but not limited to refractory chronic cough, Chronic Obstructive Pulmonary Disease (COPD) and non-tuberculous mycobacteria.
The primary objective of this study is to assess the overall performance of the Hyfe Cough Monitoring System (HCMS, Hyfe Inc., 2022) when used by individuals with problematic cough, under common living conditions.The monitoring period for outpatients will be 24 hours.
Detailed description
Researcher will evaluate the accuracy of the mobile HCMS as a tool to monitor cough. HCMS is a dedicated Android smart watch running specialized software that runs continuously and calculates a patient's cough rate on an hourly basis. After providing informed consent, research subjects will be instructed to wear the HCMS and a second watch serving as an audio recorder. These devices will be kept on the wrist or within 3 feet (~91 cm) of the mouth, a behavior abetted by keeping the charging station for both watches on the bedside table. Participants will be asked to go about their day as usual while wearing these devices.
The subjects will be instructed to not turn off either watch for the duration of the 24 hours. In addition, participants will be instructed to avoid environments with active coughers and to inform others in their environment that sound is being recorded. Additionally, they will be told to avoid getting the watches wet. Participants will be instructed to charge the watches on a nightstand next to the bed while they sleep using the provided watch chargers. At the end of the 24-hour period, participants will be instructed to turn off and remove the watches. Additionally, participants will be given a printed Hyfe diary to write down the exact time when the device was turned on/off and any times the watch was not being worn. The devices will be returned to the researchers once the recording period is complete.The 24 hours of continuous ambient sounds collected by the audio recording watch and will be listened to by Hyfe technicians trained in cough annotation and data security, and each coughwill be annotated on the audio file using audio-analysis software, according to standard operating procedures developed by Hyfe. These results will be compared on an hourly basis with the coughs detected by HCMS and the performance of the HCMS for identifying cough in home settings calculated in comparison to the human annotated continuous recording reported.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Clínica Universidad Navarra site | – | Device: Clinical Validation of the Hyfe Cough Monitoring SystemResearch subjects will be enrolled at Clínica Universidad Navarra. Research subjects will be instructed to wear the HCMS and a second watch serving as an audio recorder. These devices will be kept on the wrist or within 3 feet (~91 cm) of the mouth, a behavior abetted by keeping the charging station for both watches on the bedside table. Participants will be asked to go about their day as usual while wearing these devices. |
| OHSU site | – | Device: Clinical Validation of the Hyfe Cough Monitoring SystemResearch subjects will be enrolled at OHSU. Research subjects will be instructed to wear the HCMS and a second watch serving as an audio recorder. These devices will be kept on the wrist or within 3 feet (~91 cm) of the mouth, a behavior abetted by keeping the charging station for both watches on the bedside table. Participants will be asked to go about their day as usual while wearing these devices. |
| Decentralized - US-based | – | Device: Clinical Validation of the Hyfe Cough Monitoring SystemResearch subjects will be enrolled in a decentralized manner ou of the Hyfe North American Clinical Office. Research subjects will be instructed to wear the HCMS and a second watch serving as an audio recorder. These devices will be kept on the wrist or within 3 feet (~91 cm) of the mouth, a behavior abetted by keeping the charging station for both watches on the bedside table. Participants will be asked to go about their day as usual while wearing these devices. |
Who may qualify
- Ages
- 21 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- The study population are adults (21 years old or above) seeking health care and who express concern about their cough.
Key inclusion criteria (5 listed)
- Age 21 years old or above
- Individuals seeking health care, who express concern about their active cough (problematic cough)
- Anticipate that they can collect auditory recording and keep the devices with them continuously for 24 hours.
- Residing in a domestic environment without unusually high and / or persistent background sound levels .
- Willing to wear a watch an audio recorder and keep them at bedside (within 3 ft) from the mouth during the night.
Key exclusion criteria (4 listed)
- Inability to accept the privacy policy and terms of use of HCMS due to confidentiality or other concerns.
- Inability to avoid unusually prolonged loud environments for the duration of the 24-hour study period.
- Need to conduct confidential conversations during the 24-hour monitoring period
- Individuals who have had significant change in antitussive therapy in the week preceding study.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Clinical Validation of the Hyfe Cough Monitoring SystemThe subjects will be instructed to not turn off either watch for the duration of the 24 hours. In addition, participants will be instructed to avoid environments with active coughers and to inform others in their environment that sound is being recorded. Additionally, participants will be told to avoid getting the watches wet. Participants will be instructed to charge the watches on a nightstand next to the bed while they sleep using the provided watch chargers. At the end of the 24-hour period, participants will be instructed to turn off and remove the watches. Additionally, participants will be given a printed Hyfe diary to write down the exact time when the device was turned on/off and any times the watch was not being worn. The devices will be returned to the researchers once the recording period is complete. | Device | Clínica Universidad Navarra site, Decentralized - US-based, OHSU site |
Primary outcome
Hyfe Cough Monitoring System (HCMS) accuracy using Pearson correlation coefficient
Time frame: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the primary outcome measures.
The HCMS timestamps coughs as they occur. Hourly counts of cough events will be compared with ground truth hourly counts determined by trained human annotators, who will listen to audio recordings and timestamp each cough using proprietary labeling software. If human annotators and the HCMS agreed perfectly, their paired hourly counts would lie on the line y=x (ground truth on the x-axis, HCMS on the y-axis). Agreement with this ideal line quantifies HCMS performance: the Pearson correlation coefficient must be close to 1 By comparison with ground truth annotations, each HCMS timestamp is either a true positive or a false positive; by the usual formula, HCMS Sensitivity = Number of true positives Total number of coughs where the denominator is determined by ground truth.
Hyfe Cough Monitoring System (HCMS) accuracy using OLS slope/intercept
Time frame: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the co-primary outcome measures
The HCMS timestamps coughs as they occur. Hourly counts of cough events will be compared with ground truth hourly counts determined by trained human annotators, who will listen to audio recordings and timestamp each cough using proprietary labeling software. If human annotators and the HCMS agreed perfectly, their paired hourly counts would lie on the line y=x (ground truth on the x-axis, HCMS on the y-axis). Agreement with this ideal line quantifies HCMS performance: the slope and intercept of the OLS line of best fit must be close to 1 and 0, respectively. By comparison with ground truth annotations, each HCMS timestamp is either a true positive or a false positive; by the usual formula HCMS Sensitivity = Number of true positives Total number of coughs where the denominator is determined by ground truth.
Hyfe Cough Monitoring System (HCMS) sensitivity of cough detection
Time frame: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the co-primary outcome measures.
The HCMS timestamps coughs as they occur. Hourly counts of cough events will be compared with ground truth hourly counts determined by trained human annotators, who will listen to audio recordings and timestamp each cough using proprietary labeling software. By comparison with ground truth annotations, each HCMS timestamp is either a true positive or a false positive; by the usual formula HCMS Sensitivity = Number of true positives Total number of coughs where the denominator is determined by ground truth.
Hyfe Cough Monitoring System (HCMS) false positivity rate
Time frame: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the co-primary outcome measures.
The HCMS timestamps coughs as they occur. Hourly counts of cough events will be compared with ground truth hourly counts determined by trained human annotators, who will listen to audio recordings and timestamp each cough using proprietary labeling software. The false positive rate is the total number of false positives divided by the total number of monitoring hours.
3 secondary outcomes
Differential analysis of nighttime versus daytime HCMS performance
Time frame: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours. All of the coughs timestamped by trained human annotators and by the Hyfe Cough Monitoring System will be used to calculate the second
Differential analysis of HCMS performance for individual subjects
Time frame: Each participant will be monitored continuously with the audio recorder and the Hyfe Cough Monitoring System for 24 hours. All of the coughs timestamped by trained human annotators and by the HCMS will be used to calculate the seco
Dependence of HCMS performance on individual cough rates
Time frame: Each participant will be monitored continuously with the audio recorder and the Hyfe Cough Monitoring System for 24 hours. All of the coughs timestamped by trained human annotators and by the HCMS will be used to calculate the seco
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 28 Sep 2023.
- Background: PubMed 17101736Decalmer SC, Webster D, Kelsall AA, McGuinness K, Woodcock AA, Smith JA. Chronic cough: how do cough reflex sensitivity and subjective assessments correlate with objective cough counts during ambulatory monitoring? Thorax. 2007 Apr;62(4):329-34. doi: 10.1136/thx.2006.067413. Epub 2006 Nov 13.
- Background: PubMed 21079381Leconte S, Ferrant D, Dory V, Degryse J. Validated methods of cough assessment: a systematic review of the literature. Respiration. 2011;81(2):161-74. doi: 10.1159/000321231. Epub 2010 Nov 13.
- Background: PubMed 23231789Barton A, Gaydecki P, Holt K, Smith JA. Data reduction for cough studies using distribution of audio frequency content. Cough. 2012 Dec 12;8(1):12. doi: 10.1186/1745-9974-8-12.
- Background: PubMed 17694868Matos S, Birring SS, Pavord ID, Evans DH. An automated system for 24-h monitoring of cough frequency: the leicester cough monitor. IEEE Trans Biomed Eng. 2007 Aug;54(8):1472-9. doi: 10.1109/TBME.2007.900811.
- Background: PubMed 34215614Gabaldon-Figueira JC, Brew J, Dore DH, Umashankar N, Chaccour J, Orrillo V, Tsang LY, Blavia I, Fernandez-Montero A, Bartolome J, Grandjean Lapierre S, Chaccour C. Digital acoustic surveillance for early detection of respiratory disease outbreaks in Spain: a protocol for an observational study. BMJ Open. 2021 Jul 2;11(7):e051278. doi: 10.1136/bmjopen-2021-051278.
- Derived from this study: PubMed 39762316Chaccour C, Sanchez-Olivieri I, Siegel S, Megson G, Winthrop KL, Botella JB, de-Torres JP, Jover L, Brew J, Kafentzis G, Galvosas M, Rudd M, Small P. Validation and accuracy of the Hyfe cough monitoring system: a multicenter clinical study. Sci Rep. 2025 Jan 6;15(1):880. doi: 10.1038/s41598-025-85341-3.
- Individual participant dataSharing planned: Yes. All anonymized IPD that support each resulting publication.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Carlos Chaccour principal investigator
Clinica Universidad de Navarra, Universidad de Navarra
3 sites in 2 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Cough, run by Hyfe Inc at 3 sites in 2 countries.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: status not confirmed, as of the sponsor's last update on 28 Sep 2023. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 3 sites in United States, Spain. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Hyfe Cough Monitoring System (HCMS) accuracy using Pearson correlation coefficient (time frame: Each participant will be monitored continuously with the audio recorder and the HCMS for 24 hours, and cough events will be tabulated hourly. Each participant will thus contribute 24 data points to the calculation of the primary outcome measures.). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05723159, which also lists 6 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Sep 2023.