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NCT Number: NCT07137260

Digital Assessment of Real-World Walking Activity in Pulmonary Hypertension: A Prospective Multicenter Trial

The goal of this observational study is to validate digital mobility outcomes for monitoring the treatment and disease progression in adult patients with pulmonary hypertension. The main question it aims to answer is:

-Do digital mobility outcomes (measured digital endpoints characterizing walking behavior) correlate with measures of precapillary pulmonary pressure as assessed by right heart catheterization?

Participants will be asked to wear a small sensor on the lower back for one week at a time for a total of 3 times: at diagnosis and follow-up visits at 3-6 months and again at 6-12 months. Follow-up visits are scheduled by the treating clinician. At the end of the study participants can choose to receive feedback on the sensor measurements.

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Key information

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

Robert Bosch Hospital, Stuttgart, Baden-Wurttemberg, Germany

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Pulmonary hypertension confirmed by right heart catheterization
  • Presence of precapillary pulmonary hypertension at time of recruitment, defined as mean pulmonary arterial pressure (MAP) ≥ 20 mmHg, pulmonary arterial wedge pressure (PAWP) ≤ 15 mmHg and pulmonary vascular resistance (PVR) > 2 Wood units (160 dyn·s·cm-5)
  • After the right heart catheterization another follow-up visit is required in 3, 6, or 12 months
  • Independent walking without assistance and a 6-min walking distance > 100m
  • WHO Functional Class I-III
  • Ability to provide informed consent and to participate in the study procedures
  • Willingness to wear the Axivity AX6 Sensor for 7 days

Exclusion criteria

  • Hospitalization for a pulmonological disease within the 30 days prior to study recruitment
  • Neurological or orthopedic disease which limits walking ability
  • Acute pain which limits walking ability
  • Poor vision, which limits walking ability
  • Terminal illness with life expectancy < 1 year
  • Ongoing treatment for malignancy
  • Acute psychosis or other severe psychiatric illness
  • Substance dependence

Treatment and study plan

Accelerometer (measurement of walking activity)

Device

Wearing an accelerometer (size 23x32,5x8,9 mm, weight 11g) on the lower back consistently for one week at a time to measure walking activity. The sensor is fixed with waterproof plasters. No feedback is given to the participant while wearing the sensor and no data can be read directly from the sensor.

Primary outcomes

  1. Correlation of digital mobility assessments with measured pulmonary arterial pressures

    Time frame: Baseline assessment at first diagnosis, follow-up assessments after 3-6 months and again after 6-12 months (follow-up time frames are determined by the treating clinician).

    Correlation of the digital mobility and walking parameters measured by the Axivity AX6 sensor with the precapillary pulmonary artery pressure during right heart catheterization. As the digital mobility parameters for pulmonary hypertension are still largely unknown, the primary variable will be the average walking speed for walking episodes of > 30 seconds and compared with the measured pulmonary vascular resistance. The sensor is worn for 1 week at a time for a total of three sets of measurements (determined by scheduled clinical follow-up visits). The goal is to determine the feasibility of digital parameters for risk stratification and measuring disease activity and response to treatment.

Secondary outcomes

  1. Description of the general daily walking behaviour of patients with precapillary pulmonary hypertension: amount of walking episodes

    Time frame: Measured at diagnosis (baseline visit) and two follow-up visits (between 3-6 months and again after 6-12 months, as determined by the treating clinician).

    Amount of walking episodes as measured by the AX6 Axivity Sensor. The sensor is worn on the lower back for 1 week at a time at diagnosis and two follow-up visits.

  2. Description of the general daily walking behaviour of patients with precapillary pulmonary hypertension: duration of walking episodes

    Time frame: Measured at diagnosis (baseline visit) and two follow-up visits (between 3-6 months and again after 6-12 months, as determined by the treating clinician).

    Duration of walking episodes in seconds, hours and minutes as measured by the AX6 Axivity Sensor. The sensor is worn on the lower back for 1 week at a time at diagnosis and two follow-up visits.

  3. Description of the general daily walking behaviour of patients with precapillary pulmonary hypertension: amount of steps

    Time frame: Measured at diagnosis (baseline visit) and two follow-up visits (between 3-6 months and again after 6-12 months, as determined by the treating clinician).

    Amount of daily steps as measured by the AX6 Axivity Sensor. The sensor is worn on the lower back for 1 week at a time at diagnosis and two follow-up visits.

  4. Correlation between validated digital mobility outcomes and important prognostic markers of cardiac function

    Time frame: Measured at diagnosis (baseline visit) and two follow-up visits (between 3-6 months and again after 6-12 months, as determined by the treating clinician).

    Correlation of validated digital mobility outcomes with prognostic markers of cardiac function:

    • Right heart catheterization: middle pulmonary arterial pressure, right atrial pressure, cardiac index, mixed venous saturation
    • Echocardiography: right atrial size, systolic pulmonary artery pressure (SPAP), Tricuspid annular plane systolic excursion (TAPSE)
    • NT-proBNP
  5. Correlation between digital mobility outcomes and disease progression

    Time frame: Measured at diagnosis (baseline visit) and two follow-up visits (between 3-6 months and again after 6-12 months, as determined by the treating clinician).

    Correlation between validated digital mobility outcomes and clinical progression of pulmonary hypertension. Disease progression is measured by mortality, hospital admission secondary to pulmonary hypertension, and changes in any of the following: WHO functional class, REVEAL score (Registry Risk Score for Pulmonary Arterial Hypertension), COMPERA score (Comparative, Prospective Registry of Newly Initiated Therapies for Pulmonary Hypertension), dyspnea (mMMRC), emPHasis-10 score, 6-minute walking test.

  6. Investigation of potential confounders

    Time frame: From enrollment to end of study after the last follow-up visit at 6-12 months.

    Investigation of potential confounders such as functional capacity (6-minute walking test, WHO functional class), sex, age, mono-, dual-, or tripple therapy for pulmonary hypertension.

Study contacts

Contact information is provided by the study sponsor or research team.

Prof. Dr. med. Simon Jäger

CONTACT

[email protected]

+49 911-398-2822

Simone Panzer

CONTACT

[email protected]

+49 911-398-119943

Sponsors and collaborators

Lead sponsor

Simon Jäger

Other

Collaborators

  • Klinikum Nürnberg
  • LMU Klinikum
  • Robert Bosch Medical Center
  • SLK Kliniken Heilbronn GmbH

Registry information

Important dates

Study start
2024
Primary completion
2026
Study completion
2027
First posted
Aug 22, 2025
Registry last updated
Aug 22, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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