Postoperative follow-up by automated text messaging versus telephone call in outpatient care with continuous regional analgesia: a randomized controlled feasibility trial.

Background: Patients with continuous nerve blocks need structured follow-up, but daily phone calls are resource-intensive. Automated text messaging may offer a scalable alternative.

Methods: In this randomized feasibility trial, 100 outpatients with continuous peripheral nerve catheters were assigned to either automated WhatsApp-based follow-up (mobile app group) or daily telephone calls (phone group) for 3 days. The primary outcome was usability, measured by the System Usability Scale (SUS, 0-100 scale; scores ≥68 indicate acceptable usability, ≥85 excellent usability). Secondary outcomes included satisfaction, response rates, reconsultations, and catheter-related events.

Results: Out of 100 randomized patients, 91 were analyzed (46 mobile app group; 45 phone call group). The mobile app achieved a mean SUS score of 87.8, reflecting excellent usability. Satisfaction and response rates were high and similar between groups. Reconsultations were more frequent with the app (28.3% vs 6.7%), mainly non-urgent patient calls. Reports of minor catheter-related events were also more common in the app group (60.9% vs 37.8%).

Conclusions: Automated messaging is feasible, demonstrates excellent usability, and preserves patient satisfaction. The higher rates of minor symptom reporting and reconsultations highlight areas for refinement in future research.

Trial registration number: NCT06313294.