A previous suicide attempt (SA) is a strong predictor of death from future suicidal behaviors. Approximately one-third of individuals who attempt suicide seek treatment for their injuries from hospital emergency departments (EDs) [1], and the immediate period following discharge from hospital is critical for emergency and mental health care service follow-up, as most suicide reattempts occur within the first month of discharge [2]. For example, Hunt et al showed that 47% of fatal suicide reattempts occurred before the first scheduled follow-up appointment [3].

There has, therefore, been growing interest in the development of brief contact interventions (BCIs) delivered following discharge from the ED after an SA. BCIs are low-resource, nonintrusive interventions seeking to maintain long-term contact with patients after an SA. BCIs follow a structured schedule and remain operational over a sustained period of time. They commonly use short letters [4], postcards [5], phone calls [6], and crisis cards [7] to keep in contact with participants, without the provision of additional therapies. BCIs have been mostly used with clinical populations following presentation to an ED for self-harm, self-injury, self-poisoning or an SA. The content of BCIs differs between studies, but generally involves a short sentence expressing concern for the patient and emphasizing the availability of help should it be needed. BCIs have shown mixed or inconclusive results, but they indicate trends toward preventive effects in specific at-risk subgroups (eg, first suicide attempters, females, young suicide attempters) depending on the BCI employed. The pioneer intervention was proposed by Motto et al [4] and was based on postal contact. Motto provided 5 years of postal contact with patients who refused follow up after an SA. The objective was to show the patients that someone was concerned about their situation and maintain positive feelings toward them. After 5 years, a significant decrease in suicide-related deaths was observed in the contacted group (vs no-contact group). In a study by Carter et al [5], postcards were sent in the year following an SA, with a lower number of repeat episodes in the contacted group, especially among women. In general, these interventions aim to improve help-seeking and may facilitate access to health care services in the case of recurrence of suicidal ideation.

By the end 2017, mobile cellular subscriptions worldwide are expected to reach 4.3 billion globally, and mobile broadband subscriptions have grown more than 20% annually in the last 5 years. Mobile phones are generally kept on at all times and carried everywhere, making them an ideal platform for the broad implementation of personalized and mobile health (mHealth) interventions [8]. mHealth has the potential to reduce waiting times for appointments and reduce the need to meet in-person with a clinician, successively diminishing the workload of mental health professionals; to be more cost-effective to practices; and to encourage self-care strategies [9]. A substantial amount of interactive and psychoeducational apps are readily available to download concerning a wide range of health issues, including suicide prevention [10]. A recent review of existing technology-enhanced interventions addressed determinants of suicidal behavior [9]. Included studies examined the use of standalone or, in most cases, adjunctive technology-enhanced interventions for suicide prevention delivered by mobile phone app, text message, telephone, computer, Web, CD-ROM, and video.

Mobile phones have many characteristics that make them well suited for health interventions. For example, the frequent use of mobile phones is associated with an opportunity for mass communication. mHealth can be defined as the use of mobile computing and communication technologies in health care and public health [11]. mHealth interventions have the potential to incorporate qualities often associated with more effective health communication interventions, such as personalization, tailoring, interactivity, and message repetition at a relatively low cost. In the suicide prevention setting, mobile phone technology can support the transition of care, specific treatment targets, and safety planning—all of which are important elements of treatment [12,13].

Mobile text messaging (short message service, SMS) in particular has proven to be an effective form of psychiatric intervention [14]. Text messages can be sent in a standardized or individualized format and are available on all cellular phones, including low-cost devices. They can also be sent from a server-based platform that allows automatic prescheduling of message delivery and monitoring of delivery receipts. Studies such as Suicide Intervention Assisted by Messages (SIAM) [15] and Reconnecting AFTer a suicide attempt (RAFT) (Larsen et al, unpublished data, 2017) incorporate the use of stand-alone (RAFT) or adjunctive (SIAM) mobile phone-enhanced interventions for suicide prevention. The aim of these studies is to help connect participants with support services following discharge using SMS contacts, reducing repeat episodes of self-harm, reducing representations to the ED, and ultimately reducing deaths by suicide.

We conducted a feasibility and acceptability study of SIAM [16], demonstrating that the intervention was technically robust and well accepted by patients. A randomized controlled trial is ongoing; however, we hypothesize that a descriptive analysis of selected cases would bring insight regarding the capability of a mobile-based BCI to trigger patient-initiated contact with emergency services. This case series aimed to identify cases of patients recruited in the SIAM study that may demonstrate the capability of a mobile-based brief contact intervention for triggering patient-initiated contact with a crisis support team at various time points throughout the mobile-based follow-up period.

We performed a descriptive analysis on a selected sample of patients randomized in the intervention group of the SIAM study, recruited between August 24, 2014, and June 5, 2017. SIAM is a 2-year, multicentre randomized controlled trial conducted by the Brest University Hospital, France. The study was registered on Clinical Trials Registry (clinicaltrials.gov NCT02106949). The study protocol is described in detail elsewhere (see Multimedia Appendix 1) [15]. The study includes participants aged 18 years or over, who have attended a participating hospital for an SA, and have been discharged from the ED or a psychiatric unit (PU) for a stay of less than 7 days. Eligible participants are randomized between the SIAM intervention messages and a control group. This study was approved by the French West VI ethics committee.

Participants in the intervention group receive the SIAM text messages 48 hours after discharge, then at day 8 and day 15, and months 1, 2, 3, 4, 5, and 6. The messages refer to validation of the suffering, recall of the discharge agreement, and ongoing outreach care. The messages are also personalized with the participant’s name, the monitoring doctor’s name, and a local crisis telephone number. An example message contains the following text: “Mr X, we hope that your situation is getting better and that you can attend the consultation with Dr Y (April 7th 2011 at 10:00 h). You can call us for anything you may need at 0298000000.”

All participants, regardless of their randomization, received treatment as usual (TAU) including a postdischarge consultation with a psychiatrist. Study monitoring phone calls by a trained psychiatrist were also conducted at 6 and 13 months to perform follow-up evaluations.

The primary outcome measure of the SIAM study is the number of participants who have a repeat SA within 6 months. Secondary outcomes assess the number of attempts after 13 months and the number of deaths at both time points. To date, 387 participants have been recruited to the SIAM study. As recruitment is ongoing, complete data on the number of crisis calls initiated by participants in the intervention arm are not available. Nevertheless, representative cases were identified by the trial management office to reflect contacts initiated by participants at different points through the study.

Inclusion criteria for this case series were as follows: patients recruited in the SIAM study who had attended both the 6-month and 13-month monitoring interviews, and who had contact with emergency services during the study period.

Members of the study office (SB, CM, LC, and MW) established an initial list of patients meeting the inclusion criteria. The contents of the monitoring interviews were reviewed to identify patients who had contact with emergency services during the study period. SB and MC finally selected patients who demonstrated the capability of a mobile-based brief contact intervention for triggering patient-initiated contact with a crisis support team at various points throughout the follow-up period.

Three cases were identified, and we report the assessment of the participants’ baseline Mini International Neuropsychiatric Interview (MINI) [17] and Columbia Suicide Severity Rating Scale (CSSR-S) [18] and a narrative description of circumstances associated with their participant-initiated contact with the crisis team.

We have presented three cases describing situations within the SIAM intervention where crisis support services offered through this BCI have been initiated. In each case, the contact has been initiated by the study participant immediately after receiving a message (Case 3) or a few days later (Case 1 and 2). These contacts have also been initiated over a range of periods since discharge, from 1 week (Case 1) to 6 months (Case 2). These cases highlight the potential for connecting individuals to crisis services after an SA using automated text messages. The use of text messaging is likely to be more cost-effective than attempting follow-up phone calls, which require considerable on-going resources that may limit the feasibility of regular follow-ups. Furthermore, our experience from other studies indicates that calls are frequently not answered [19].

The sociodemographic details in Table 1 indicate that all the 3 cases relate to individuals aged over 40 years, and all the 3 were unemployed. This is perhaps surprising, as mHealth interventions are often considered to have the greatest potential for younger participants. These results demonstrate the potential for such interventions across a range of sociodemographic characteristics.

This case series presents an example of a real-world intervention triggered by an mHealth intervention. In particular, this intervention aims to strengthen the connection between patients and their care team by encouraging contact during a crisis. Similar low-intensity interventions also have the potential to be made available to a wider population of participants, for example, through other health care services or self-registrations from individuals who may be in crisis but not otherwise seeking help. There is, therefore, a potential to connect more people with appropriate care before a hospital presentation.

Although these cases demonstrate the feasibility of initiating crisis contact using text messages, the effectiveness cannot yet be determined as the SIAM study is ongoing. It is therefore too early to address whether a text message–based BCI can reduce repeat episodes and mortality. Furthermore, the comparator arm in this study is TAU; therefore, the effectiveness of a text message–based BCI versus a telephone-based BCI cannot be compared. Further investigation into the methods [20] and mechanisms [21] of BCIs is warranted.

The SIAM mobile intervention was proposed as an adjunct to existing treatment strategies and not as a substitute. It was not designed as a remote counseling service [22].

As a result, the text message–based contact was deliberately limited to a one-way communication. We disabled the feature of two-way communication to encourage phone calls and face-to-face contacts. However, as illustrated, a simple message can have an important impact. Contents of messages are of particular importance, and certain key characteristics such as personalization, caring sentiment, and polite text are associated with more successful preventative messages [23].

As with any outreach activity, this intervention presents a possible risk of intrusiveness into the daily lives of participants. This issue has not been assessed in the papers we reviewed or in other reviews in the field [24], and in our earlier feasibility study, no patients reported finding this mHealth intervention intrusive [16]. Conversely, in the third case reported here, a text message was received at a timely moment. However, an SMS may also arrive at an inconvenient time; therefore, informational messages may be ignored or deleted. Extended interventions incorporating momentary assessments may additionally lack responses at these times. Researchers should ensure that such burden would not be detrimental to participants' well-being, particularly when studying individuals who have recently been discharged or may currently be facing a crisis.

In our study, the SMS intervention was proposed as an adjunct of TAU. Others have suggested additional supportive outreach and coping strategies; for example, in the Brief Mobile Treatment (BMT) intervention [25], a patient received generic weekly text messages up to 26 weeks, supportive phone calls, and access to audio phone messages to reinforce psychotherapy principles. BMT participants received text reminders about meditation, problem solving, spiritual or philosophical ideas, the importance of social support, avoiding alcohol and drugs, and crisis helpline details. Our eventual aim is to integrate an mHealth intervention within existing emergency care procedures, as this may increase the effectiveness of both the mHealth intervention and emergency services.

The Web app we developed for the SIAM study allowed the patient to respond to messages they received. However, as part of our safety protocol to avoid the possibility of unanswered crisis messages, we disabled the two-way communication feature. Since we started the study, natural language processing (NLP) machine learning prediction methods have been shown to predict suicide risk as well as heightened psychiatric symptoms in free-text responses sent via a mobile phone [26]. NLP methods applied on SMS communication may help to create low-cost and effective alternatives to traditional resource-heavy data monitoring systems and support decision making of clinicians.

SMS is a powerful tool to connect the patient with health care services. Being a simple and affordable technology, it also allows for the addition of other content as links to support websites and self-monitoring apps. A recent review showed that mHealth interventions had a larger effect when used for conveying psychoeducation. Safety planning, for example, can be easily implemented [27]. Furthermore, assessment of symptoms could also be performed using SMS, and it may allow for an accurate assessment of suicide ideations [28]. These features may help to identify, together with face-to-face assessment, personalized trajectories of symptoms, cognitive abilities, and symptoms impacting other symptoms [29].

The use of SMS allows the health care team to keep in touch with people that are not reachable by existing BCIs. It may be used as a useful additional or alternative to standard care when people decline other forms of treatment. Although we used a Web system to deploy our intervention, our main goal is to encourage person-to-person contact between suicide attempters and health care providers. Torous et al [30] evaluated an mHealth intervention that successfully encouraged participants to be more open when disclosing symptoms of depression. We believe that our mHealth intervention may also improve the likelihood of patients disclosing suicide ideation to emergency services and seeking help. The full effects of the SIAM intervention and related results on suicide reattempt reduction will be reported upon conclusion of the trial.

Brief contact interventions are a promising technique for maintaining contact with patients following discharge from the ED and preventing repeat SAs. This case series has demonstrated the ability of text message BCIs to encourage patients to contact health care services in times of a crisis and over periods up to 6 months following discharge from the hospital. An ongoing randomized controlled trial of the SIAM intervention aims to demonstrate the effectiveness of such mHealth BCIs for suicide prevention.