After obtaining ethical approval, eligible participants were recruited from the hemodialysis unit. The study purpose, procedures, risks, and benefits were explained, and written informed consent was obtained. Participants meeting inclusion criteria underwent baseline assessments, including demographic data, medical history, HAM-D scores, and blood sampling for CRP measurement. Participants were randomly assigned to receive either sertraline or placebo using a computer-generated randomization sequence. The sertraline group initially received 25 mg/day, titrated up to a maximum of 100 mg/day over 4 weeks based on clinical response and tolerability. The placebo group received identical-looking tablets. Participants were monitored for 12 weeks, with follow-up visits every 2 weeks. Adherence, side effects, and any changes in medical status were assessed at each visit. At the end of 12 weeks, final HAM-D scores were obtained, and blood samples were collected for CRP measurement. All data were recorded on a standardized form.
