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CompletedNCT04056715EXAMINE-HCMUpdated Mar 1, 2023

Extended ECG Monitoring in HCM Patients

An observational study in Hypertrophic Cardiomyopathy, Nonsustained Ventricular Tachycardia and Ventricular Tachycardia, sponsored by iRhythm Technologies, Inc.. Completed at 1 site in United States. Open to participants aged 18 Years to 65 Years. Per ClinicalTrials.gov, last updated 2023-03-01.

Sponsored by iRhythm Technologies, Inc. · Observational

Study type
Observational
Model
Cohort
Time perspective
Prospective
Enrollment
250
Ages
18 Years to 65 Years
Sex
All
01

Study summary

The purpose of this study is to determine, among a large cohort of 300 consecutive patients with hypertrophic cardiomyopathy, if extended ambulatory monitoring using the iRhythm Technologies, Inc. Zio XT device results in identifying a greater burden of nonsustained ventricular tachyarrhythmia (nsVT) compared to current ACCF/AHA guideline recommended 48-hour monitoring.

Read the detailed description

Optimal duration to monitor patients for identifying nsVT remains unclear. The investigators aim to determine the prevalence and burden of nsVT with longer term monitoring with the iRhythm Zio XT device over a 2-week period vs. 48 hours; and whether, this greater burden of nsVT compared to conventional shorter monitoring potentially identifies a subset of HCM patients who may be at higher risk of sudden cardiac death.

02

Conditions studied

  • Hypertrophic Cardiomyopathy
  • Nonsustained Ventricular Tachycardia
  • Ventricular Tachycardia
  • Atrial Fibrillation
  • Arrhythmia

Keywords

  • electrocardiography
  • electrocardiogram
  • mobile cardiac monitoring
  • ambulatory monitoring
  • ECG
  • EKG
03

In context

Atrial Fibrillation

3,870 studies on the registry are indexed under Atrial Fibrillation; 924 are open to participants now.

This study's enrollment of 250 is below the median of 300 across 1,363 observational studies indexed under Atrial Fibrillation.

Browse Atrial Fibrillation studies →

Lead sponsor

iRhythm Technologies, Inc. is the lead sponsor of 4 studies on the registry; none are open to participants now.

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

04

Who can participate

Ages eligible
18 Years to 65 Years
Sexes eligible
All
Accepts healthy volunteers
No
Sampling method
Probability sample

Study population

Patients from the hypertrophic cardiomyopathy population will be recruited.

Inclusion criteria

  • Subject must be 18 to 65 years of age at time of informed consent and must not be a member of a vulnerable population.
  • Subject has been diagnosed with hypertrophic cardiomyopathy, as defined by a maximal LV wall thickness of ≥15 mm anywhere in LV wall, in absence of another cause that could be responsible for the LV hypertrophy.
  • Subject eligible to receive the Zio XT device per the current approved indications for use.

Exclusion criteria

Exclusion Criteria:

  • Subject with pacemaker
  • Known skin allergies or reaction to adhesives
  • The investigator deems a condition that could limit a subject's ability or unwillingness to participate in the study, comply with study required monitoring and/or follow-up visits.
05

Study design

Observational model
Cohort
Time perspective
Prospective
Enrollment
250 participants (actual)
Patient registry
No

Groups and cohorts

  • HCM Group

    Eligible HCM subjects will be monitored for arrhythmias with a 2-week ECG patch.

    Device: Zio XT

Interventions

  • DeviceZio XT

    ambulatory cardiac monitoring device

06

What researchers measure

Primary outcomes

  1. Total number of nsVT runs through 14 days of ambulatory cardiac monitoring, as compared to the first 48 hours.

    Compare the number of nsVT runs detected between the first 48 hours vs 2 weeks of ambulatory cardiac monitoring.

    Time frame: 14 days

Secondary outcomes

  1. Total number of atrial fibrillation runs through 14 days of ambulatory cardiac monitoring, as compared to the first 48 hours.

    Compare the number of AF runs detected between the first 48 hours vs 2 weeks of ambulatory cardiac monitoring.

    Time frame: 14 days

  2. Number of clinical management decisions based on 14 days of ambulatory cardiac monitoring, as compared to the first 48 hours ambulatory cardiac monitoring.

    Compare the number clinical decisions based on the first 48 hours vs 14 days of ambulatory cardiac monitoring.

    Time frame: 14 days

07

Study locations

1 site
  • Tufts Medical Center
    Boston, Massachusetts 02111, United States
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Mar 1, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04056715
Lead sponsor
iRhythm Technologies, Inc.
Responsible party
Sponsor
First posted
Aug 14, 2019
Start date
Jan 14, 2020
Primary completion
Apr 18, 2022
Completion
Apr 18, 2022
Last update
Mar 1, 2023

Study contacts

Martin Maron, MD
principal investigator · Tufts Medical Center

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
Yes
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Feb 2023. You cannot join it, but the record below documents what was studied.

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