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Related Concept Videos

Clinical Trials01:16

Clinical Trials

11.1K
Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
There are four phases in a clinical trial. A phase one...
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Clinical Trials: Overview01:11

Clinical Trials: Overview

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Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
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Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

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Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
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Blinding01:11

Blinding

4.1K
Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
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Related Experiment Video

Updated: Mar 27, 2026

Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults
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Direct-to-Participant Enrollment in a Virtual Trial: Lessons Learned From the Heartline Study.

Mellanie True Hills1, Serge Korjian2, Gerald Chi3

  • 1StopAfib.org, American Foundation for Women's Health, Decatur, Texas, USA.

JACC. Advances
|March 24, 2026
PubMed
Summary
This summary is machine-generated.

Decentralized clinical trials can effectively recruit older adults using multichannel strategies. The Heartline Study enrolled over 34,000 participants aged 65+, achieving good gender and geographic diversity for atrial fibrillation research.

Keywords:
RUCA representationatrial fibrillationheartlinerecruitment strategiesvirtual trial

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Area of Science:

  • Clinical Trials
  • Digital Health
  • Cardiology

Background:

  • Decentralized clinical trials (DCTs) leverage direct-to-participant recruitment to access diverse and large participant pools.
  • The Heartline Study aimed to assess a mobile application for early atrial fibrillation (AF) diagnosis and management.

Purpose of the Study:

  • To share insights on multichannel recruitment strategies for the decentralized Heartline Study.
  • To evaluate the effectiveness of a mobile health program and Apple Watch features in managing atrial fibrillation.

Main Methods:

  • Recruitment targeted U.S. adults aged 65+ with iPhones and Medicare coverage.
  • A multichannel approach included digital (email, social media) and traditional (direct mail, community outreach) methods.
  • Recruitment strategies were continuously assessed and refined to optimize participant reach.

Main Results:

  • Over 321,000 applications were installed, leading to 34,244 enrolled participants (11% conversion rate).
  • The study achieved broad geographic representation across the United States.
  • Participant demographics included 54.2% women, 93% White, 2.8% Asian, 2.7% Black, and 2.5% Hispanic.

Conclusions:

  • The Heartline Study successfully recruited a large cohort of older adults (≥65 years) using a direct-to-participant, multichannel approach.
  • The trial demonstrated excellent gender and geographic diversity, exceeding typical cardiology trial representation for women and including rural populations.
  • While achieving diversity goals in gender and geography, the study highlighted a need for enhanced strategies to improve racial and ethnic representation in future decentralized trials.