NCT04958707.

Study name	Evaluating the feasibility of a mobile phone‐based intervention on depression, anxiety, and stress of the dementia patients' caregivers
Methods	Study design: RCT Country: Vietnam
Participants	Caregivers of patients with dementia Inclusion criteria:  a. primary caregivers of patients with dementia for at least the past 6 months and will continue to be for the next 6 months of the intervention. Dementia patients are those who have been diagnosed with dementia for at least 6 months and are living in the community. b. able to read and understand Vietnamese (at least primary education), and willing to participate in the study; c. having a smartphone that has the Zalo app or willing to have this Zalo app be installed (there will be short training of using Zalo for new users). Exclusion criteria: a. any acute diseases or cognitive impairment (screening by Mini‐Cog); b. vision or hearing impairment. Stated purpose: (1) understanding the information and skills required by informal carers to populate the content of the intervention and (2) test the clinical feasibility of the intervention and feasibility of a fully‐power randomized controlled trial
Interventions	Intervention: Informational support group The participants in the intervention group will be added to a chat group in the Zalo app, named the Dementia Caregiver Support group. Weekly, the investigator will post one of the eight topics identified in phase 1. The posted information will be based on evidence‐based resources and consulted by geriatricians, the neurologist, and the psychologist who specialized in dementia. Immediately after posting the topic, one investigator will call the participants to ensure they read and understand the post. The chat group monitor will also collect the questions or comments from the carers who are encouraged to share their feelings or experiences with relevant questions. Then the monitor will post the answers after consulting with the experts. Control: Usual care (participants are introduced to the website Alzheimer.org to search for eligible information. They will be interviewed by a questionnaire at baseline, post‐intervention and 3 months post‐ intervention)
Outcomes	Participants'outcomes of interest for this review Mental health symptoms/depression – Depression Anxiety Stress Scale (DASS‐21) Mental health symptoms/anxiety – Depression Anxiety Stress Scale (DASS‐21) Mental health symptoms/distress/PTSD – Depression Anxiety Stress Scale (DASS‐21) Social outcomes (perceived social support) – Multidimensional Scale of Perceived Social Support (MSPSS) Economic outcomes Nil Time points: baseline, post‐intervention (9 months)
Starting date	1 September 2021
Contact information	Nguyen Tran To Tran
Notes	Source of funding:  Prospective trial registration number: NCT04958707