Development of a scale for the evaluation of the quality of the shared decision process in multiple sclerosis patients

• Published in: PloS one Vol. 17; no. 5; p. e0268125
• Main Authors: Álvarez-Rodríguez, Elena, Sánchez-Franco, César Manuel, Pérez-Haro, María José, Bello-Otero, Laura, Aguado-Valcarcel, Marta, González-Suárez, Inés
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 13.05.2022; Public Library of Science (PLoS)
• Subjects: Biology and Life Sciences; Care and treatment; Chronic illnesses; Decision making; Disease; Health planning; Health risks; Medicine and Health Sciences; Multiple sclerosis; Outpatient care facilities; Patient outcomes; Patient satisfaction; Patients; Physical Sciences; Principal components analysis; Quality assessment; Questionnaires; Research and Analysis Methods; Social aspects; Social Sciences; Values; Spain
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0268125

In the last years, therapeutic decisions in multiple sclerosis (MS) have become challenging due to expanded options with different treatment profiles attending to efficacy, safety, and route and frequency of administration. Moreover, patients with multiple sclerosis (PwMS) increasingly wish to be involved in their therapeutic decision process. Therefore, a new, patient-centric shared decision model (SDM), is gaining relevance. However, validated scales oriented to assess the quality of the process itself are lacking. The AGA-25 scale is a fit-for-purpose 25-item scale based on two validated scales in MS (Treatment Satisfaction Questionnaire for Medication (TSQM) and Decisional Conflict Scale (DCS)). The aim of this work is to develop and validate the AGAS-25 in Spanish. Two hundred and three PwMS (aged 17 to 67; 155 [76.4%] females) undergoing stable disease modifying treatment in the last 6 months were consecutively recruited. The Principal Component Analysis suggested a four-factor structure for the 25-item version of the questionnaire: 1) satisfaction with the SDM process 2) adverse events with the DMT, 3) convenience of the chosen-DMT and 4) information reliability. The internal consistency of the measurement was adequate (Cronbach's alpha = 0.88). Our results support the use of the AGAS-25 scale to assist SDM in Spanish-speaking PwMS.