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Survival Rate and Predictors of Mortality Among Hemodialysis Patients in West of Iran, 1996–2015

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Survival Rate and Predictors of Mortality Among Hemodialysis Patients in West of Iran, 1996–2015 [Downloaded free from http://www.ijpvmjournal.net on Sunday, December 30, 2018, IP: 176.102.244.186] Original Article Survival Rate and Predictors of Mortality among Hemodialysis Patients in West of Iran, 1996–2015 Abstract Salman Khazaei, Background: Hemodialysis (HD) is one of the treatments provided to end‑stage renal disease (ESRD) Mehdi Yaseri1, patients. A few studies have investigated the survival rate of HD patients in Iran. Hence, we decided Shahrzad to investigate the survival rate and it is predictors among Iranian ESRD patients. Methods: This is 1 a retrospective cohort study conducted in 165 HD patients in Tuyserkan city (Hamadan province) Nematollahi , 2 during 20 years from 1996 to 2015. The checklist used to gather information was comprised of Zahra Zobdeh , patients’ demographic and clinical information. The analysis was performed using Kaplan–Meier Vida Sheikh3, curves, log‑rank test, and cox regression model. Results: The most prevalent cause of ESRD was Mohammad Ali st th reported to be high blood pressure (32.7%). The probability of survival rate at the end of 1 , 5 , and Mansournia1 10th year was 0.65, 0.16, and 0.05, respectively. Results of multivariate cox regression showed that Research Center for Health old age, catheter vascular access, and high hemoglobin level have a negative significant effect on Sciences, Hamadan University survival of HD patients (P < 0.05). Conclusions: Overall, the survival of HD patients seems to be of Medical Sciences, Hamadan, low in Tuyserkan as compared to other studies. Age, ESRD cause, vascular access, marital status, and Iran, 1Department of hemoglobin level among other factors are proved to have a significant effect on survival probability. Epidemiology and Biostatistics, School of Public Health, Tehran Keywords: Cox regression models, end‑stage renal disease, hemodialysis patients, survival University of Medical Sciences, Tehran, Iran, 2Depatrment of Nursing and Midwifery, Introduction 79% and 34%, respectively.[7] Few studies Valiasr Hospital of Tuyserkan, in Iran have investigated the survival rate Hamadan University of Chronic kidney disease considered a of HD patients as well. Montaseri et al. Medical Sciences, Hamadan, general term for heterogeneous disorders Iran, 3Department of Internal showed that the overall 1‑, 2‑, 3‑, and affecting the structure and functions of the Medicine, Clinical Research 5‑year survival rates for HD patients are Development Unit of Shahid kidney and characterized by the failure of 75%, 63%, 50%, and 23%, respectively.[8] Beheshti Hospital, Hamadan kidneys to function properly above 50% Furthermore, Beladi Mousavi et al. have University of Medical Sciences, of their normal capacity.[1] If glomerular Hamadan, Iran reported that patient’s survival rates at 1, 3, filtration rate became <15 mL/min/1.73 m², and 5 years is 89.2%, 69.2%, and 46.8%, or the need for treatment with dialysis or respectively.[9] Several factors for such a transplantation, the so‑called end‑stage high mortality including advanced age, renal disease (ESRD) occurs.[2] diabetes mellitus, adult dominant polycystic Against the USA, Western European kidney disease, high blood pressure (BP), countries, and other developed countries, glomerulonephritis, low body mass index, developing countries like Iran have homocysteine, creatinine, albumin, dialysis experienced increasing trend of ESRD adequacy, method of renal replacement Address for correspondence: [3] Dr. Mohammad Ali Mansournia, in the recent decade. Increase in the therapy, and etiology of kidney failure Department of Epidemiology prevalence of diabetes mellitus and have been reported.[9‑13] Among all the and Biostatistics, School hypertension as the most leading causes aforementioned factors, cardiovascular of Public Health, Tehran of ESRD, as well as an increase in the disease is the leading cause of death University of Medical Sciences, [10] Enghelab Square, Tehran, Iran. number of hemodialysis (HD) centers and in ESRD patients. Although there is E‑mail: m ansournia_ma@ increase in the detection rate of patients growing evidence of HD survival in yahoo.com can be in relation to this increasing trend developed countries, evidence in developing in Iran.[4,5] It should be noted that nearly countries like Iran is rarely available. 50% of the ESRD patients in Iran are Therefore to reach better understanding Access this article online treated with HD and the remaining are predictors of survival rate for HD patients, Website: www.ijpvmjournal.net/www.ijpm.ir undergone transplantation and peritoneal we decided to investigate the survival rate DOI: [6] dialysis (PD). In the United States, the and it’s predictors among HD patients in 10.4103/ijpvm.IJPVM_399_16 1‑ and 5‑year survival rate of patients HD is the western part of Iran. Quick Response Code: This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial- How to cite this article: Khazaei S, Yaseri M, ShareAlike 4.0 License, which allows others to remix, tweak, and Nematollahi S, Zobdeh Z, Sheikh V, Masournia MA. build upon the work non-commercially, as long as appropriate credit Survival rate and predictors of mortality among is given and the new creations are licensed under the identical terms. hemodialysis patients in West of Iran, 1996–2015. For reprints contact: [email protected] Int J Prev Med 2018;9:113. © 2018 International Journal of Preventive Medicine | Published by Wolters Kluwer - Medknow 1 [Downloaded free from http://www.ijpvmjournal.net on Sunday, December 30, 2018, IP: 176.102.244.186] Khazaei, et al.: Survival rate and predictors of mortality among hemodialysis patients Methods 30.46 months, respectively. However, these differences in survival by ESRD cause were not significant (P = 0.61). Study design and participants The probability of survival rate at the end of 1st, 5th, We performed a historical cohort study on 165 HD patients and 10th year was 0.65, 0.16, and 0.05, respectively. in Tuyserkan county (Hamadan province) in the western Moreover, Table 1 shows that the only significant part of Iran. At the 2011 census, the county’s population differences in survival time were found for marriage was 103,786 (https://www.amar.org.ir/english). This study categories (66.9 months in singles vs. 20.3 in married was approved by the Ethics Committee of Tehran University and vs. 20 in bigamy, P = 0.02), and hemoglobin of Medical Sciences (TUMS. SPH. REC. 1395.1300). To levels (23.8 in ≤10 mg/dl vs. 21.2 in >10 mg/dl, P = 0.03). provide a homogenous cohort we excluded patients with acute renal failure receiving transient HD, emigrants, The results of the uni‑ and multi‑variable analysis using undergone transplantation, or deceased by causes other that the Cox’s PHs model are demonstrated in Table 2. Based renal failure and patients on maintenance HD for ESRD at on the multivariable results, in comparison to patients the Valiasr Hospital between 20 years of follow up between with <45 years of age patients with 45–60 and >60 year the years of 1996 and 2015 were included in the study. had 2.9 and 5.54 higher risk of death (P < 0.01). Patients with the hemoglobin level over 10 mg/dl as compared Study measurement tool to who’s with lower than that, have a 74% lower risk of Data were gathered by a checklist on hospital records of decrease (HR = 1.74, P = 0.018). In addition, patients with all ESRD patients. The checklist used in this study was catheter as vascular access had 3.6‑fold higher risk of death comprised of patient’s demographic information (including 3.6 (HR = 3.6, P < 0.001). Patients with BP as ESRD cause age, sex, residence area, educational level, the history of had a higher risk of death compared patients with diabetes tobacco use or substance abuse, the date of discontinuation as ESRD cause (HR = 1.73, P = 0.049). the therapy, the date of death if occurred, blood type and RH), and clinical information (including hemoglobin, Discussion creatinine, and blood urea nitrogen levels before the In this retrospective study, the median of survival time was dialysis procedure, number of weekly dialysis sessions, the 22.4 months, whereas the survival probability in 1st, 5th, type of intravenous access, and background diseases such and 10th years were 65%, 16%, and 5%, respectively. High as cardiovascular diseases). BP was the most prevalent cause of ESRD in 32.7% of Statistical analysis patients. The old age, catheter vascular access, High BP as an ESRD cause, and high hemoglobin level has a negative To define the time scale, we considered the time interval effect on survival of HD patients. between the first sessions of HD to the time of patient’s death. Patients, who they were changed to peritoneal Our results showed a lower survival rate in comparison to dialysis therapy, were transferred to another dialysis unit or the patients in other parts of the country. For instance, the received kidney grafts were considered to be censored. 5‑year survival of HD patients was found to be 48.6% in Southern Iran,[9] and 23% in the Northern part of Iran.[7] The The log‑rank test was used to comparison median of result of the study in Brazil revealed that overall survival survival between subgroups. Schoenfeld’s residual test was of HD patients were 84.71% and 63.32% in 1 and 5 years, used to test the proportional hazards (PHs) assumption and respectively.[14] Studies have shown that age, undoubtedly, uni‑ and multi‑variable (adjusted by other variables in the is one of the significant risk factors for survival.[11,15] In the model) cox PH with a 95% confidence interval was used present study, age had a statistically significant impact on to identify the significant predictors of survival rate for survival of patients.
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