The Effect of the LEFT Smartwatch App as Sleep Positional Therapy for Nocturnal Gastroesophageal Reflux Symptoms.

The primary efficacy measure is relative change in total nocturnal gastroesophageal reflux symptoms measured by the Nocturnal Gastroesophageal Reflux Disease Symptom Severity and Impact Questionnaire (N-GSSIQ).

The N-GSSIQ is a 20-item questionnaire measuring the severity, morning impact and concern about nocturnal gastro-esophageal reflux disease. The N-GSSIQ is a validated questionnaire to assess nocturnal GERD symptom severity over the past 2 weeks. The N-GSSIQ is comprised of three subscales: Nocturnal Gastroesophageal Reflux Disease Symptom Severity (13 questions, score range 0-65), Morning Impact of Nocturnal Gastroesophageal Reflux Disease (2 questions, score range 0-10), and Concern about Nocturnal Gastroesophageal Reflux Disease (5 questions, score range 0-20). Total score ranging from 0 to 95. A higher score indicates more severe symptoms.

Percent responders as treatment success, defined as subjects with a minimal 50% reduction in nocturnal gastroesophageal reflux symptoms measured by N-GSSIQ

Change in total Nocturnal Gastroesophageal Reflux Disease Symptom Severity and Impact Questionnaire (N-GSSIQ) score.

The N-GSSIQ is a 20-item questionnaire measuring the severity, morning impact and concern about nocturnal gastro-esophageal reflux disease. The N-GSSIQ is a validated questionnaire to assess nocturnal GERD symptom severity over the past 2 weeks. The N-GSSIQ is comprised of three subscales: Nocturnal Gastroesophageal Reflux Disease Symptom Severity (13 questions, score range 0-65), Morning Impact of Nocturnal Gastroesophageal Reflux Disease (2 questions, score range 0-10), and Concern about Nocturnal Gastroesophageal Reflux Disease (5 questions, score range 0-20). Total score ranging from 0 to 95. A higher score indicates more severe symptoms.

Change in sleep position. Four sleep positions will be studied: left lateral decubitus, right lateral decubitus, supine and prone. The outcome sleep position will be noted as percentage of the time sleeping in a certain sleep position during the entire sleep.

Change in the number of nocturnal reflux free nights measured by daily symptom diary

Change in reflux symptoms measured by Reflux disease questionnaire (RDQ) questionnaire.

The RDQ is a validated 12-item questionnaire to obtain information on the current severity and frequency of reflux symptoms (heartburn, regurgitation and dyspepsia). The three subscales are the different reflux symptoms and consist of four questions. Scores were scaled with a Likert scale which ranges from 0 to 5. Subjects have more frequent and severe reflux symptoms if the RDQ score is higher

Change in sleep quality measured by Pittsburgh Sleep Quality Index (PSQI).

The PSQI is a validated 19-item questionnaire assessing various factors relating to sleep quality, sleep disturbance and usual sleep habits. The 19 items are grouped into seven component scores (sleep quality, sleep onset latency, sleep duration, sleep efficiency, sleep disturbances, use of sleep medication and daytime dysfunction). The seven component scores are summed to calculate a global PSQI score, which has a range of 0-21. A higher score indicates a worse sleep quality; and a score above 5 is suspect for insomnia.

Change in sleep quality measured by Functional Outcomes of Sleep Questionnaire (FOSQ).

The FOSQ is a validated questionnaire about sleep-quality of life which consists of 30 questions. The short form which consists of 10 questions will be used in this study. Questions have a 4-point Likert scale. The recall period is not specified, but two weeks will be used in this study. A lowerscore indicates a worse sleep quality.