Optimizing the Follow-Up Journey in Interstitial Lung Disease: The OPTIMIZE-ILD-2 Trial

The OPTIMIZE-ILD-2 trial is a prospective, randomized, open-label clinical trial designed to evaluate the impact of a coordinated follow-up pathway on patients with established interstitial lung disease (ILD). In routine clinical practice, follow-up workflows for ILD are frequently fragmented, requiring multiple hospital visits for pulmonary function tests, laboratory analysis, treatment administration, and consultations with various specialists, which increases the burden for both patients and caregivers. This study compares the standard follow-up care against an optimized circuit where all routine monitoring procedures and interdisciplinary consultations are pre-bundled and scheduled within a single, coordinated hospital visit. All eligible patients under active ILD follow-up are included consecutively to ensure a pragmatic, real-world representation of the treated ILD population. The primary objective is to measure the total follow-up time burden, defined as the total home-to-home time required to complete the follow-up circuit. As a cross-sectional assessment within a longitudinal context, secondary objectives include assessing socioeconomic cost-burden, the environmental carbon footprint of the follow-up journey, health-related quality of life, and clinical frailty. Caregiver-related outcomes, including burden and experience measures, are contingent upon the presence of a primary caregiver and the provision of their independent informed consent. The design of this protocol was informed by a patient focus group and is officially endorsed by the 'AIRE' Associació Catalana de Malalts i Trasplantats Pulmonars, ensuring a patient-centered approach that prioritizes follow-up efficiency and human impact.