Is xerostomia a risk factor for cardiovascular morbidity and mortality in maintenance hemodialysis patients?

Prevalence of Dental Caries in Patients on Renal Replacement Therapy-A Systematic Review

Patients under renal replacement therapy (RRT) often show oral problems, including dry mouth, periodontal and dental diseases. This systematic review aimed to evaluate the caries burden in patients on RRT. Therefore, a systematic literature search based on the databases PubMed, Web of Science and Scopus was performed by two independent individuals in August 2022. Search terms were: "caries" AND "dialysis", "caries" AND "renal replacement therapy", "caries" AND "kidney". The systematic process was complemented by manual search. Studies on adult patients (age ≥ 18 years), treated by any form of RRT and explicitly reporting caries prevalence or incidence were checked for their eligibility and subsequently analyzed qualitatively. For all included studies, a quality appraisal was applied. From the systematic search, 653 studies were identified, of which 33 clinical investigations were included in the qualitative analysis. The majority (31 studies) of all included patients underwent hemodialysis (HD), with a sample size between 28 and 512 participants. Eleven studies investigated a healthy control group. Oral examinations were heterogeneous across studies; the caries burden was primarily assessed by decayed-(D-T), missing- and filled-teeth index (DMF-T). The number of decayed teeth ranged between 0.7 and 3.87 across studies. Only six out of these 11 studies found significant differences in caries prevalence/incidence between RRT and controls, whereby only four studies confirmed worse caries burden in RRT individuals. No information was provided on caries stadium (initial caries, advanced caries, invasive treatment need), caries activity or location (e.g., root caries) across studies. Most of the included studies were assessed to be of moderate quality. In conclusion, patients on RRT suffer from a high prevalence of dental caries. Alongside a need for further research in the field, improved, multidisciplinary, patient-centered dental care concepts are required to support dental and overall oral health in individuals on RRT.

Oral Mucosa Status and Saliva Parameters of Multimorbid Adult Patients Diagnosed with End-Stage Chronic Kidney Disease

There has been an increasing number of patients diagnosed with chronic diseases. Many of those diseases determine changes in patients’ social and even professional life. The aim of the present work was to analyze saliva and oral mucosa parameters in adult patients diagnosed with chronic diseases. A total of 228 patients took part in the research. A total of 180 patients were hemodialyzed in Diaverum dialysis stations, and there were 48 patients from the Conservative Dentistry with Endodontics Clinic of the Academic Centre of Dentistry of Silesian Medical University in Bytom and patients from the dentistry division of the Arnika Clinic in Zabrze not diagnosed with any such diseases. Selected saliva parameters (secretion, pH and buffer capacity) and mucosa status were examined. In order to obtain information regarding xerostomia, patients were given a questionnaire. Patients assigned to the control group rarely used water to make swallowing easier or used candies to lessen the feeling of oral cavity dryness. They also rarely suffered from eye dryness. The feeling of dryness also did not influence their social life. The amount of produced saliva was higher in the control group. There was a significantly lower percentage of patients with a low buffer capacity of saliva. There were no differences in terms of saliva pH values between the two groups of patients. A significantly lower number of patients were diagnosed with ecchymosis, candidiasis, scrotal tongue and mechanical damages. Patients diagnosed with chronic diseases need to be provided with long-term care.

Effects of Gargling with an Aroma Solution on Xerostomia, Halitosis, and Salivary pH in Hemodialysis Patients – A Randomized Controlled Trial

Background:

Despite developments in renal replacement therapy, therapeutic fluid restriction reportedly induces xerostomia in 28.2~85.5% of hemodialysis patients, which causes serious inconveniences in their daily living and is detrimental to their quality of life.

Objective:

The purpose of this study was to identify the effects of gargling with an aroma solution (A-Solution) on xerostomia, halitosis, and salivary pH in hemodialysis patients.

Methods:

This study design was a randomized controlled trial. The participants of this study were 56 hemodialysis patients of E General Hospital in Seoul, Korea. They were divided into an experimental group (n=28) treated by gargling with 20 ml of A-Solution for 15 seconds and a control group (n=28) where pateints did not gargle with A-Solution, and data were collected from October 1 to November 15, 2013. The outcome variables were measured in the pretest and at 5, 30, 60, and 120 minutes in the two groups. The collected data were analyzed using SPSS (version 18.0 for Windows).

Results:

Xerostomia was lower in the experimental group than in the control group at each time point apart from the pretest and differed significantly in the interaction between groups and time points. Salivary pH and halitosis differed significantly between the experimental and control groups, across time points, and in the interaction between group and time point.

Conclusion:

The findings of this study suggest that aroma gargling is a useful oral-care intervention for solving oral problems experienced by hemodialysis patients such as xerostomia and halitosis.

Hemodialysis-specific factors associated with salivary flow rates

The saliva is important to maintain the integrity of tissues and teeth, besides having microbial activity. Hemodialysis (HD) patients usually have reduced salivary flow rate (SFR) and are exposed to all its associated complications. The aim of the present study was to identify HD-related factors associated with reduced SFR. A cross-sectional study was performed with maintenance HD patients. Stimulated whole saliva was collected before and after HD. Xerostomia was assessed through the validated xerostomia inventory and thirst through the dialysis thirst inventory. Parameters of dental health status were obtained by the decayed, missed, and filled teeth index and community periodontal index. One hundred twenty-eight patients (66 males) participated in this study. Stimulated SFR before HD was 0.38 ± 0.28 mL/min. In univariate analysis and after adjusting for several factors, serum urea before HD session, serum intact parathormone (iPTH), calcium-phosphorus product (Ca×Pi), serum ferritin, and number of medications were negatively correlated with SFR in univariate analysis. Moreover, patients taking sevelamer had reduced SFR in comparison with those not receiving it (SFR 0.32 ± 0.19 vs. 0.44 ± 0.23 mL/min, P = 0.003). At multivariate analysis, including dialysis and nondialysis-related factors, age, elevated pre-HD serum urea, higher Ca×Pi product, higher iPTH, and sevelamer use remained as factors that were independently associated with a reduced SFR. After dialysis, there was a significant increment in SFR (0.39 ± 0.28 vs. 0.60 ± 0.34 mL/min, P < 0.001). Several HD-related features were associated with reduced SFR, including serum urea, sevelamer use, and bone and mineral disorders markers.