Sebastiaan van der Storm

116 Chapter 5 patients with a declaration by their general practitioner, surgeon or ostomy nurse will be given access to the platform in the public version of the application. Control group Patients in the control group use the application immediately after inclusion until 1 year postoperatively or until stoma reversal. The control group receive a restricted version of the application that contains generic stoma-related information, which is not personalized and timed. This information is comparable with the standard patient information folders developed by the Dutch Stoma Association and based on the Dutch guideline.1 Outcomes The primary outcome is stoma quality of life. As the application is patient-centred, providing personalized and timed guidance and a peer-support platform, the Patient Reported Outcome Measures (PROM's); patient satisfaction and psychological adaption, are considered as important secondary outcomes. Other secondary outcomes are postoperative outcomes, stoma-related problems and number of contacts with the ostomy nurse at the outpatient clinic. Table 1 describes all the study outcomes and how and when they will be measured. Trial recruitment 1. Elective surgery that preoperatively is expected to result in creation of a stoma: Preoperatively, the treating colorectal surgeon or supervised surgical assistant will introduce the Stoma-APPtimize trial; if the patient is interested in participating in the trial, they will be given the Patient Information Form (PIF). At the following outpatient visit, the ostomy nurse will explain the study and address any questions the patient may have after reading the PIF. Patients will be granted at least 24 h to decide whether they want to participate. After providing written informed consent, patients are randomized to either the control group or the intervention group.

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