Prevalence of moderate to severe lower urinary tract symptoms in systemic sclerosis

Objective Lower urinary tract symptoms (LUTS) are common in SSc. The severity of symptoms can affect the quality of life (QOL); however, LUTS is often neglected during routine assessments. We determined the prevalence of moderate to severe LUTS in SSc and its associated factors. Methods A cross-sectional study was conducted between March 2020 and June 2020. Adult SSc patients were enrolled from the Scleroderma Clinic, Khon Kaen University, Thailand. All completed a self-administered questionnaire on LUTS using the International Prostate Symptom Score (IPSS), categorized into absent, mild, moderate or severe LUTS. In addition, we investigated the factors associated with moderate to severe LUTS, and the correlation between IPSS-QOL score and IPSS severity. Results A total of 135 patients were enrolled. Most cases were female (87 cases; 64.4%) and had dcSSc (88 cases; 65.2%). Twenty-six were defined as having moderate to severe LUTS, for a prevalence of 19.3% (95% CI 13.0, 26.9%). In addition, most had storage symptoms (63.0%), followed by voiding symptoms (19.3%) and post-voiding symptoms (12.6%). The factors associated with moderate to severe LUTS per the multivariable logistic regression included a modified Rodnan skin score >= 20 points and gastrointestinal symptoms with adjusted odds ratios 7.64 and 5.78, respectively. In addition, the IPSS-QOL score had a moderate positive correlation with IPSS severity (rho = 0.560, P < 0.001). Conclusion Moderate to severe LUTS occurred in about one-fifth of SSc patients, particularly those with extensive skin tightness and gastrointestinal involvement. The more severe the LUTS, the poorer the QOL.