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Previous studies have demonstrated that respiratory dysfunction has a potential association with low back pain (LBP). Despite the role of the diaphragm for respiration and spinal stability, knowledge of the function of both sides of the diaphragm in subjects with LBP is still limited. This study aimed to compare the structural integrity and function of the right and left hemidiaphragm by ultrasonography (USG) in subjects with and without nonspecific chronic low back pain (NS-CLBP). A total of 37 subjects with NS-CLBP and 34 healthy subjects participated in this case-control study. The thickness, thickness change, and excursion of the right and left hemidiaphragm were compared within and between the groups during quiet breathing (QB) and deep breathing (DB) through B-mode and M-mode ultrasound imaging. The LBP group had a significantly smaller degree of right hemidiaphragm thickness change (P =.001) compared with the healthy control group, with a strong effect size. Nevertheless, there was no significant change for diaphragm thickness and excursion between the two groups. The result showed that, in the healthy group, the right hemidiaphragm had a significantly smaller thickness at expiration and larger thickness change compared with the left hemidiaphragm, with a moderate effect size. Based on the multivariate prediction analysis, the right hemidiaphragm thickness change might significantly predict LBP. We found that participants with LBP had a smaller degree of right hemidiaphragm thickness change. Also, the right hemidiaphragm thickness change might significantly predict LBP. [ABSTRACT FROM AUTHOR]

The Arthritis Self-Efficacy Scale-8 (ASES-8) is one of the most commonly used scales to measure patient-reported arthritis-specific self-efficacy. However, evidence about the validity and reliability of ASES-8 in an Arabic-speaking arthritis population is lacking. This study aimed to cross-culturally adapt and assess aspects of validity and reliability of the Arabic version of the ASES-8. The ASES-8 was translated into the Arabic language using the back-translation method, and administered to 67 patients with rheumatoid arthritis (RA). Construct validation methods used exploratory factor analysis and correlating the ASES-8 scores with disease-related variables expected to be related to the arthritis self-efficacy construct. An internal consistency test was conducted. Floor and ceiling effects were considered present if more than 15% of patients achieved high (=10) and low (=1) scores on the Arabic ASES-8 for both the scale and item scores. Exploratory factor analysis demonstrated a one-factor solution (factor loadings: 0.54–0.81). ASES-8 scores were correlated with all measures assessed (r = −0.24 to −0.57 and r = 0.06–0.66), demonstrating construct validity. Internal consistency was acceptable for measures of Cronbach's alpha (0.86–0.88). The scale did not exhibit ceiling or floor effects. The Arabic version of ASES-8 is valid and reliable for evaluating self-efficacy in patients with rheumatoid arthritis. The Arthritis Self-Efficacy Scale (ASES-8) questionnaire was translated and adapted for use in Arabic language. This questionnaire is a valid and reliable instrument for evaluating self-efficacy among Arabic individuals with rheumatoid arthritis. This will support greater use of this tool worldwide in clinical and research practices that include Arabic people. [ABSTRACT FROM AUTHOR]