A Study to Assess the Usability of the Embrace Seizure Detection Watch in Children and Young Adults With Dravet Syndrome

Phase 3

Terminated

Lead Sponsor: Zogenix International Limited, Inc., a subsidiary of Zogenix, Inc.

Brief Summary: This is an exploratory sub-study to ZX008-1503 \[NCT02823145\]. Subjects will be fitted with an Embrace seizure detection watch and seizures detected by the watch will be compared to those entered into an electronic seizure diary.

Detailed Description: This sub study will include up to 20 participants who meet the entry criteria for the main Study ZX008-1503 and who are willing to wear the Embrace watch and use the Embrace Alert app for 12 consecutive weeks. Those invited to participate will undergo all procedures included in the main study during their participation in this sub-study,

Recruitment & Eligibility

Inclusion Criteria

Meeting all of the main study ZX008-1503 [NCT02823145] inclusion criteria
Subject is willing to wear the Embrace watch on the wrist (alternatively ankle, if needed for younger children). Subjects are asked to wear the watch for as many hours of the day as possible and for the entire night, if possible, for the duration of the sub-study.
Subject's parent/caregiver is willing to use the Alert App.
Subject/subject's caregiver is willing to ensure that the Embrace watch remains within close proximity of the paired iPod Touch running the Empatica Alert app.

Exclusion Criteria

Subject has a known hypersensitivity to any of the Embrace device materials.
Subject has a clinically significant condition, or has had clinically relevant symptoms or a clinically significant illness in the 4 weeks prior to Visit 1, other than epilepsy, that would negatively impact study participation, collection of study data, or pose a risk to the subject.

Arm && Interventions

Group	Intervention	Description
ZX008	ZX008 (Fenfluramine Hydrochloride)	ZX008 is supplied as an oral solution in a concentration of 2.5 mg/mL. Subjects will be titrated to an effective dose beginning with 0.2 mg/kg/day (maximum: 30 mg/day).

Primary Outcome Measures

Name	Time	Method
Overall Usability of the Empatica Embrace Seizure Detection Watch System (Embrace) in Outpatients With Dravet Syndrome	Approximately 12 weeks	The assessment of user experience with Embrace watch system included Likert Ease of Use Questionnaire. The questionnaire had 3 items related to use of the Embrace watch, Mate App and Alert App. All the questions were responded on 5-point Likert scale (1-Very difficult, 2-difficult, 3-Neutral, 4-Easy and 5-Very easy). Response to each item on the questionnaire was reported. Responses across all items on the questionnaire were summed to create an overall index with total score of 0 to 15, where higher scores represents the better usability of the device.

Secondary Outcome Measures

Name	Time	Method

Locations (2): University of California San Francisco
🇺🇸
San Francisco, California, United States
The Children's Hospital Colorado
🇺🇸
Aurora, Colorado, United States