Maximal inspiratory pressure is associated with health-related quality of life and is a reliable method for evaluation of patients on hemodialysis

• Published in: Physiotherapy theory and practice 2022-08, Vol.38 (8), p.1-1058
• Main Authors: Vieira, Carlos Filipe, Costa, Henrique S, Lima, Márcia M O, Alves, Frederico L, Rodrigues, Vanessa G B, Maciel, Emílio Henrique B, Prates, Maria Cecília S M, Lima, Vanessa P, Mendonça, Vanessa A, Lacerda, Ana Cristina R, Figueiredo, Pedro Henrique S
• Format: Article
• Language: English
• Subjects: Dialysis; Functional impairment; Health status; Hemodialysis; Measurement; Quality of life; Reliability
• ISSN: 0959-3985; 1532-5040
• DOI: 10.1080/09593985.2020.1818338

To evaluate the association between Maximal Inspiratory Pressure (MIP) and health-related quality of life (HRQoL) and to verify the reliability of the MIP in patients on hemodialysis. In a repeated-measures design, patients on hemodialysis performed MIP and specific HRQoL questionnaire (trial 1). The MIP was repeated after 6 to 8 weeks (trial 2) and reliability was assessed using Intra-class Correlation Coefficient. Standard Error of Measurement and Minimal Detectable Change scores were calculated. Sixty-one individuals (68.9% men) were evaluated in trial 1. MIP was associated with specific domains "Symptoms" (r = 0.45; R adjusted = 0.192) and the kidney disease component summary (r = 0.38; R adjusted = 0.138). Regarding generic domains, the MIP was associated with "Physical Functioning" (r = 0.57; R adjusted = 0.375) and Physical component summary (r = 0.47; R adjusted = 0.258). Thirty-three patients were randomly selected to perform a second MIP test (trial 2). The Intra-class Correlation Coefficient was 0.94 (95%CI 0.88-0.97). By Bland-Altman analysis, the bias was 3.2 cmH2O, which represents a difference of 3.7%. The Standard Error of Measurement and Minimal Detectable Change for MIP were 5.9 cmH2O and 13.8 cmH2O, respectively. The MIP is a reliable test, associated with physical domains of HRQoL in patients on hemodialysis. Thus, it is a useful method for respiratory evaluation in this population.