Patients who agree to participate in the study, once the PICC is placed, download the app to their personal Smartphone or that of a family member. The app contains all the information about the catheter, including the insertion date, gauge, number of lumens, batch number, and more. The weekly catheter care is performed at home, at the health center, or in the hospital and can be performed by nursing professionals or properly trained family members or caregivers of the patient. The patient reports any incidents that may occur each week. If an incident occurs, the responsible professional contacts the patient by phone and, if necessary, makes an appointment for an in-person consultation to review the catheter. The patient records the care performed in the app and a reminder is automatically recorded in the phone calendar. The app has documentation prepared by expert personnel along with video procedures for the care, and the "step-by-step" feature that allows the care to be performed.

Usual care description: Patients in the intervention group only have information about their catheter (placement date, catheter reference and batch) on a paper card; they do not have documentary or audiovisual resources. The treatment is carried out exclusively by nursing professionals at the hospital or health centre, and the latter are the ones who contact the hospital professionals who placed it in the event of an incident. The professionals who inserted the catheter are aware of the information about the catheter removal and whether there has been any significant complication when reviewing the catheters they have inserted at the end of the year, and are not aware of the incidents until the annual review. The under-registration in computer applications means that information on a high number of inserted catheters is not available.

The application is offered to all patients at the time of PICC placement. If they accept, they go to the intervention group. If they do not accept, they go to the control group.

Number of phlebitis episodes

Number of episodes of catheter removal by reason for removal: pain

Number of infection episodes

Number of episodes of withdrawal reason due to accidental exit

Number of episodes of skin lesions

Number of thrombosis episodes

Patient satisfaction with the use of the app, through the questionnaire CSUQ: Computer System Usability Questionnaire. The CSUQ scale, or System Usability Satisfaction Questionnaire, is a tool used to assess user satisfaction with a specific system. It is a Likert-type measurement scale, where participants evaluate their level of satisfaction with various aspects of a system, generally on a scale ranging from 1 (totally disagree) to 7 (totally agree).