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NCT Number: NCT07812233

Heart Rate Variability Biofeedback for Anxiety in Autistic Youth

Heart rate variability biofeedback (HRVB) is a breathing-based intervention that reduces anxiety in a range of populations. Second-generation wearable HRVB devices not only deliver scheduled biofeedback practice sessions but also allow patients to practice HRVB in-the-moment when it is needed most. This study is testing the acceptability, feasibility, and preliminary efficacy of second-generation, ambulatory HRVB for the treatment of anxiety in autistic youth.

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Key information

Age range

12 year–17 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

About this study

Fifty youth with autism and clinically significant anxiety will be recruited to participate in a single-arm, 8-week open-label, fully remote trial of HRVB. Participants will utilize the Lief Smart Patch which delivers HRVB training and practice through an embedded ECG monitor, accelerometer, and companion smartphone app. Specific aims of the research include: 1) Determine the acceptability and feasibility of second generation HRVB in autistic youth; and 2) Evaluate the preliminary efficacy of HRVB for the treatment of anxiety in autistic youth.

Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • Age 12-17 years at the time of enrollment.
  • ASD diagnosis from a qualified health professional based on medical records and confirmed based on Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM 5) criteria by the study clinician.
  • IQ ≥50 based on the Kaufman Brief Intelligence Test (KBIT-2).
  • Clinically significant anxiety, based on the Pediatric Anxiety Rating Scale (PARS) 5-item score of ≥10.
  • Stable medications for ≥30 days.
  • English speaking.
  • Willing to wear the Lief Smart Patch for 8 weeks.
  • English speaking guardian who is willing and able to complete caregiver assessments.

Exclusion criteria

  • Clinically significant cardiac arrhythmia based on parent report.
  • Current primary diagnosis of bipolar disorder, psychosis, substance use disorder, posttraumatic stress disorder, eating disorder, or major depressive disorder that requires a different treatment based in the opinion of the PI.
  • Acutely unstable medical/psychiatric condition (e.g. self-injury, suicidality) that would preclude study participation in the opinion of the PI

Treatment and study plan

Lief Smart Patch

Device

The Lief Smart Patch is a commercially available, noninvasive wearable heart rate variability biofeedback (HRVB) device. The patch includes an embedded electrocardiogram (ECG) sensor and accelerometer that interfaces with a companion smartphone application to deliver paced breathing exercises and just-in-time adaptive intervention (JITAI) prompts. It is an externally worn patch that temporarily adheres to the skin surface and can be removed by the participant.

Primary outcomes

  1. Mean 8-Week Change in Pediatric Anxiety Rating Scale (PARS) 5-Item Total Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported

    The PARS, a clinician-administered measure of child anxiety symptom severity based on both patient and parent-report will be the primary outcome measure. It has demonstrated inter-rater and test-retest reliability, and has previously been used by our group as the primary outcome measure in a RCT of mirtazapine for anxiety in youth with ASD, demonstrating sensitivity to change. The 5-item PARS score will be the primary outcome measure for this trial. Scaled score ranges from 0-25 with higher scores indicating more severe anxiety symptoms.

Secondary outcomes

  1. Proportion of Participants who Responded to Treatment at 8 Weeks According to the Improvement Item of the Clinical Global Impression-Improvement (CGI-I) (Response Defined as CGI-I = 1 or 2)

    Time frame: Week 4, Week 8. Week 8 score reported.

    The Clinical Global Impressions Global Improvement (CGI-I) is designed to take into account all factors to arrive at an assessment of response to treatment. The CGI-I scale ranges from 1 to 7 (1=very much improved; 2=much improved; 3=minimally improved; 4=no change; 5=minimally worse; 6=much worse; 7=very much worse), with lower scales indicating improvement (1=very much improved; 2=much improved). In this study, the CGI-I will be focused on the target symptom of anxiety.

  2. Mean 8-Week Change in Clinical Global Impression Severity Subscale (CGI-S)

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported.

    The CGI-S is rated on a scale from 1 to 7, where 1 = normal, not at all ill; 3 = mildly ill; 5 = markedly ill; 7 = among the most extremely ill patients. The CGI-S will be rated based on the severity of anxiety symptoms.

  3. Mean 8-Week Change in Parent-Rated Anxiety Scale for Autism Spectrum Disorder (PRAS-ASD) Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported.

    The PRAS-ASD is a novel parent-rated 25-item scale with demonstrated reliability and validity. Scores range from 0-75, with higher scores indicating more severe parent-rated anxiety.

  4. mHealth App Usability Questionnaire (MAUQ) Standalone Apps for Patients

    Time frame: Week 8

    Mean Likert rating on the mHealth App Usability Questionnaire (MAUQ) Standalone Apps for Patients. The MAUQ includes 18 questions, each rated on a Likert scale of 1-7. Total scores range from 18-126, with higher scores indicating increased usability.

  5. Feasibility

    Time frame: Week 8

    Proportion of enrolled youth meeting the scheduled daily practice criterion (≥50% study days with ≥5 minutes combined JITAI-delivered and self-initiated HRVB practice).

Other outcomes

  1. Mean 8-Week Change in Aberrant Behavior Checklist (ABC-2) Irritability Subscale Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported

    The ABC-2 is a 58-item questionnaire with 5 subscales derived by factor analysis. It has been extensively used in psychopharmacological studies of ASD and assesses many symptoms that are either central to autism or frequently a target of treatment. The Irritability Subscale is derived from 15 items, with a score range from 0-45, where higher scores indicate more severe irritability.

  2. Mean 8-Week Change in Aberrant Behavior Checklist (ABC-2) Lethargy/Social Withdrawal Subscale Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported

    The ABC-2 is a 58-item questionnaire with 5 subscales derived by factor analysis. It has been extensively used in psychopharmacological studies of ASD and assesses many symptoms that are either central to autism or frequently a target of treatment. The Lethargy/Withdrawal Subscale is derived from 16 items, with a score range from 0-48 where higher scores indicate more severe Lethargy/Withdrawal symptoms.

  3. Mean 8-Week Change in Aberrant Behavior Checklist (ABC-2) Stereotypic Behavior Subscale Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported

    The ABC-2 is a 58-item questionnaire with 5 subscales derived by factor analysis. It has been extensively used in psychopharmacological studies of ASD and assesses many symptoms that are either central to autism or frequently a target of treatment. The Stereotypic Behavior Subscale is derived from 7 items, with a score range of 0-21 where higher scores indicate more severe stereotypic behaviors.

  4. Mean 8-Week Change in Aberrant Behavior Checklist (ABC-2) Hyperactivity Subscale Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported

    The ABC-2 is a 58-item questionnaire with 5 subscales derived by factor analysis. It has been extensively used in psychopharmacological studies of ASD and assesses many symptoms that are either central to autism or frequently a target of treatment. The Hyperactivity Subscale is derived from 16 items with a score range of 0-48, where severe scores indicate more severe hyperactivity symptoms.

  5. Mean 8-Week Change in Aberrant Behavior Checklist (ABC-2) Inappropriate Speech Subscale Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported

    The ABC-2 is a 58-item questionnaire with 5 subscales derived by factor analysis. It has been extensively used in psychopharmacological studies of ASD and assesses many symptoms that are either central to autism or frequently a target of treatment. The Inappropriate Speech Subscale is derived from 4 items with a score range of 0-12, where higher scores indicate more severe Inappropriate Speech symptoms.

  6. Mean 8-Week Change in Attention Deficit Hyperactivity Disorder Rating Scale (ADHD-RS) Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 reported

    The ADHD-RS is an 18-question, parent-rated assessment reflecting DSM symptoms of ADHD. The score range is 0-54, with higher scores indicating more severe ADHD symptoms.

  7. Mean 8-Week Change in Children's Sleep Habits Questionnaire (CSHQ) Total Score

    Time frame: Baseline, Week 4, Week 8; Change from Baseline to Week 8 is reported

    The CSHQ is a 52-question parent survey used to assess sleep difficulties. 33 items are used to generate the total score, which ranges from 33-99, with a cutoff of >41 suggesting clinically significant sleep problems. Higher scores are indicative of more severe sleep problems.

Study contacts

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

Robyn P. Thom, MD

CONTACT

[email protected]

781-860-1711

Sponsors and collaborators

Lead sponsor

Massachusetts General Hospital

Other

Collaborators

  • Eagles Autism Foundation

Registry information

Important dates

Study start
2026
Primary completion
2029
Study completion
2029
First posted
Sep 10, 2026
Registry last updated
Sep 11, 2026

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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