Significance. The delay to diagnosis for patients with Postural Orthostatic Tachycardia Syndrome (POTS) has caused an unnecessary waste of resources and enormous distress on patients and their families. POTS affects between 500,000 and 3,000,000 people in the United States annually.3 It is a form of autonomic nervous system dysfunction that is associated with excessive tachycardia, among other symptoms (e.g., syncope, chest pain, palpitations, and shortness of breath) upon standing. These severe symptoms significantly affect a patient's ability to work and perform basic daily activities. For example, a recent comprehensive study of POTS patients revealed that over two-thirds of them lost income over the previous three months due to POTS symptoms. Of those, 36% reported losing more than $10,000 USD per person in the past year.4 It takes individuals with POTS four years on average to achieve a diagnosis after seeing an average of seven physicians in countless visits during that time.3 Seeking a diagnosis is not easy for POTS patients. Approximately 76% of POTS patients are misdiagnosed prior to obtaining a POTS diagnosis. Stiles et al. explain "When POTS patients ask physicians for help with their symptoms and are repeatedly told nothing is wrong, or some version of 'it's all in your head,' this can lead to patients feeling rejected or disbelieved by physicians."7 As a result of these negative experiences with physicians, many POTS patients disengage with the healthcare system entirely or suffer from depression.7, 8 Stiles and colleagues coined the term "post-traumatic misdiagnosis disorder" to refer to this set of experiences.7 Innovation. Mobile health (mHealth) technology, such as wearables, can provide key health information to empower patients when communicating with their providers. Smartwatches were being identified by POTS patients as a promising way to help patients decrease their time to diagnosis by providing them with important and diagnosis-relevant data (e.g., changes in heart rate) to share with their physicians during visits in a clinic.8 In interviews of 21 POTS patients, they reported struggling to obtain a diagnosis due to a lack of objective indicators and physicians lacking medical knowledge about POTS.8 Many received discouraging messages from healthcare providers that left them feeling helpless and caused significant stress.3 However, researchers demonstrated the potential that mHealth technology might have for POTS patients.8 Patients who utilized the mHealth technology that they had available (smart watches, fitness trackers) to provide their physicians with objective data decreased their time to diagnosis by two years.8 This study demonstrates the potential that mHealth technology might have for improving health outcomes for POTS patients and increasing their patient experience and improving physician-patient communication during visits with healthcare providers. Researchers in this study recently conducted three co-design focus groups with 11 POTS patients to solicit their design ideas of a mHealth app.13 The results revealed several desired functions of the app, including: 1) Physiological data collection from sensors (heart rate, BP, O2, ECG, etc.), 2) Patient education materials that may include a variety of modalities such as written materials, video, audio, external web links, 3) Patient-report outcomes (surveys or open-ended questions), 4) Data visualization and reporting (charts, graphs, etc. that can be provided to healthcare providers), 5) Ability to set reminders, and 6) Ability to set alerts (for things such as high heart rate). Based on this information provided by POTS patients in these focus groups, researchers in this study have designed the app features (see the Research Plan).

The researchers' long-term goal is to improve the delay (or shorten the time) to diagnosis among patients suffering from POTS symptoms using data generated from patients' use of mobile health technology outside a healthcare facility to facilitate patient-provider communication during visits in a clinic. To achieve this long-term goal, the overall objective in this project is to develop a mHealth app that can gather physiological data (heart rate, blood pressure) and provide educational tools designed to facilitate patient communication with their providers. In addition, based on the IDEA (Internalization, Distribution, Explanation, and Action) model, educational content in our mHealth system will guide patients through taking steps to interpret the results and use them to communicate effectively with healthcare providers during visits.14 To attain the overall objective, researchers in this study propose the following aims:

Aim 1. Developing a mHealth app to improve the delay to diagnosis and the quality of life of POTS patients. A user centered co-design and iterative rapid cycle testing approaches will be used to realize this Aim. The primary hypothesis is that the app will have high usability and perceived effectiveness (H1).

Aim 2. Evaluate the usability and feasibility of the mHealth app and study design. A two-arm (app vs. waitlist control), 8-month pilot randomized controlled trial will be conducted among 20 diagnosis seeking POTS patients. The primary hypothesis is that the diagnosis seeking POTS patients will be successfully recruited into the study, use the app, and complete the study (H2). The secondary hypothesis is that diagnosis seeking POTS patients will report improved learning/behavioral, visit-related, and patient outcomes, as compared to waitlist-control group patients (H3).

Note: This study is exempt from IDE requirements.