Patient-reported sleep difficulty and cognitive function during the first year of dialysis

"Is It Removed During Dialysis?"-Cognitive Dysfunction in Advanced Kidney Failure-A Review Article

Cognitive impairment is independently associated with kidney disease and increases in prevalence with declining kidney function. At the stage where kidney replacement therapy is required, with dialysis or transplantation, cognitive impairment is up to three times more common, and can present at a younger age. This is not a new phenomenon. The cognitive interactions of kidney disease are long recognized from historical accounts of uremic encephalopathy and so-called "dialysis dementia" to the more recent recognition of cognitive impairment in those undergoing kidney replacement therapy (KRT). The understanding of cognitive impairment as an extra-renal complication of kidney failure and effect of its treatments is a rapidly developing area of renal medicine. Multiple proposed mechanisms contribute to this burden. Advanced vascular aging, significant multi-morbidity, mood disorders, and sleep dysregulation are common in addition to the disease-specific effects of uremic toxins, chronic inflammation, and the effect of dialysis itself. The impact of cognitive impairment on people living with kidney disease is vast ranging from increased hospitalization and mortality to decreased quality of life and altered decision making. Assessment of cognition in patients attending for renal care could have benefits. However, in the context of a busy clinical service, a pragmatic approach to assessing cognitive function is necessary and requires consideration of the purpose of testing and resources available. Limited evidence exists to support treatments to mitigate the degree of cognitive impairment observed, but promising interventions include physical or cognitive exercise, alteration to the dialysis treatment and kidney transplantation. In this review we present the history of cognitive impairment in those with kidney failure, and the current understanding of the mechanisms, effects, and implications of impaired cognition. We provide a practical approach to clinical assessment and discuss evidence-supported treatments and future directions in this ever-expanding area which is pivotal to our patients' quality and quantity of life.

Assessment of cerebral oxygenation response to hemodialysis using near-infrared spectroscopy (NIRS): Challenges and solutions

To date, the clinical use of functional near-infrared spectroscopy (NIRS) to detect cerebral ischemia has been largely limited to surgical settings, where motion artifacts are minimal. In this study, we present novel techniques to address the challenges of using NIRS to monitor ambulatory patients with kidney disease during approximately eight hours of hemodialysis (HD) treatment. People with end-stage kidney disease who require HD are at higher risk for cognitive impairment and dementia than age-matched controls. Recent studies have suggested that HD-related declines in cerebral blood flow might explain some of the adverse outcomes of HD treatment. However, there are currently no established paradigms for monitoring cerebral perfusion in real-time during HD treatment. In this study, we used NIRS to assess cerebral hemodynamic responses among 95 prevalent HD patients during two consecutive HD treatments. We observed substantial signal attenuation in our predominantly Black patient cohort that required probe modifications. We also observed consistent motion artifacts that we addressed by developing a novel NIRS methodology, called the HD cerebral oxygen demand algorithm (HD-CODA), to identify episodes when cerebral oxygen demand might be outpacing supply during HD treatment. We then examined the association between a summary measure of time spent in cerebral deoxygenation, derived using the HD-CODA, and hemodynamic and treatment-related variables. We found that this summary measure was associated with intradialytic mean arterial pressure, heart rate, and volume removal. Future studies should use the HD-CODA to implement studies of real-time NIRS monitoring for incident dialysis patients, over longer time frames, and in other dialysis modalities.

The perception of sleep quality in kidney transplant patients during the first year of transplantation

OBJECTIVE

Poor sleep quality is one of the factors that adversely affects patient quality of life after kidney transplantation, and sleep disorders represent a significant cardiovascular risk factor. The objective of this study was to investigate the prevalence of changes in sleep quality and their outcomes in kidney transplant recipients and analyze the variables affecting sleep quality in the first years after renal transplantation.

METHODS

Kidney transplant recipients were evaluated at two time points after a successful transplantation: between three and six months (Phase 1) and between 12 and 15 months (Phase 2). The following tools were used for assessment: the Pittsburgh Sleep Quality Index; the quality of life questionnaire Short-Form-36; the Hospital Anxiety and Depression scale; the Karnofsky scale; and assessments of social and demographic data. The prevalence of poor sleep was 36.7% in Phase 1 and 38.3% in Phase 2 of the study.

RESULTS

There were no significant differences between patients with and without changes in sleep quality between the two phases. We found no changes in sleep patterns throughout the study. Both the physical and mental health scores worsened from Phase 1 to Phase 2.

CONCLUSION

Sleep quality in kidney transplant recipients did not change during the first year after a successful renal transplantation.

Sertraline treatment is associated with an improvement in depression and health-related quality of life in chronic peritoneal dialysis patients

OBJECTIVES

There is scarce data about effects of treatment of clinical depression in peritoneal dialysis (PD) population. We aimed to determine prevalence of depression, its association with health-related quality of life (HRQoL) and effects of sertraline treatment in PD patients.

MATERIALS AND METHODS

We included 124 PD patients who had been on PD at least for 6 months. Short Form of Medical Outcomes Study was used to evaluate HRQoL. Depression was screened by Beck Depression Inventory (BDI). Patients with a BDI score > or = 17 were deemed to have depression and were referred to a psychiatrist for evaluation via Diagnostic and Statistical Manual for Mental Disorders (DSM-IV) of diagnosis of clinical depression. About 25 patients diagnosed with clinical depression agreed to receive antidepressant treatment (Sertraline hydrochloride, 50 mg/day) for a 12-week period. After the treatment, biochemical analyses and questionnaires were repeated.

RESULTS

Thirty-two patients (25.8%) had depression. BDI score of patients were lower compared to those without depressive symptoms (23 + or - 6.7 and 9.8 + or - 3.0, respectively P < 0.001). Physical component scale (PCS) and mental component scale (MCS) domains of HRQoL were significantly decreased in patients with depression than in patients without depression (P < 0.001 for PCS and MCS). In bivariate analysis the BDI score was correlated inversely with the PCS and MCS (P < 0.001). Sertraline treatment improved BDI score of patients with depression (P < 0.001). HRQoL parameters also improved. No adverse effects requiring drug cessation was seen in the study group.

CONCLUSIONS

Treatment of depression with sertraline is associated with improvement of the HRQoL and symptoms related to depression.

Quality of life in hemodialysis patients: hepatitis C virus infection makes sense

PURPOSE

Hepatitis C virus (HCV) infection impairs quality of life (QOL) in patients who are not on dialysis therapy. In dialysis patients, how HCV infection affects QOL is unknown. In our study, we investigated the independent relationship between HCV infection and QOL.

METHODS

Sociodemographic and laboratory variables were recorded. Severity of depressive symptoms and QOL were assessed by Beck Depression Inventory (BDI) and Short Form-36 (SF-36), respectively.

RESULTS

Among 165 patients, 83 were anti-HCV antibody positive and 82 were anti-HCV antibody negative. Anti-HCV antibody positive patients had higher BDI scores than anti-HCV antibody negative patients (P = 0.011). Other than the social functioning subscale, all SF-36 subscales were lower in anti-HCV antibody positive patients when compared with anti-HCV negative patients. Anti-HCV antibody positive patients had lower physical (P = 0.003) and mental component summary scores (P = 0.018) than negative patients. Physical component summary score was independently associated with hemodialysis duration (P = 0.003), sleep disturbance (P = 0.046), BDI score (P = 0.027), albumin (P = 0.002), and serum hemoglobin (P < 0.0001). Physical component summary score was not associated with anti-HCV antibody positivity. Mental component summary score was independently associated with BDI score (P = 0.001), anti-HCV antibody positivity (P = 0.016), and serum hemoglobin (P < 0.0001).

CONCLUSION

HCV infection impairs QOL, especially in mental aspects, in hemodialysis patients.

Subjective and objective sleep quality in patients on conventional thrice-weekly hemodialysis: comparison with matched controls from the sleep heart health study

BACKGROUND

Studies examining sleep in the hemodialysis (HD) population have largely lacked an adequate comparison group. It therefore is uncertain whether poor sleep quality in the HD population reflects age, chronic health conditions, or effects of conventional HD therapy.

STUDY DESIGN

Cross-sectional matched-group study.

SETTING & PARTICIPANTS

Forty-six in-center HD patients were compared with 137 community participants participating in the Sleep Heart Health Study matched for age, sex, body mass index, and race.

PREDICTOR

HD patients compared with community-dwelling non-HD participants.

OUTCOMES & MEASUREMENTS

Home unattended polysomnography was performed and scored by using similar protocols. Sleep habits and sleepiness were assessed by using the Sleep Habits Questionnaire and Epworth Sleepiness Scale.

RESULTS

Average age of study samples was 63 years, 72% were white, and average body mass index was 28 +/- 5 kg/m(2). HD patients were significantly more likely than community participants to have short sleep (odds ratio, 3.27; 95% confidence interval, 1.16 to 9.25) and decreased sleep efficiency (odds ratio, 5.5; 95% confidence interval, 1.5 to 19.6). HD patients reported more difficulty getting back to sleep (odds ratio, 2.25; 95% confidence interval, 1.11 to 4.60) and waking up too early (odds ratio, 2.39; 95% confidence interval, 1.01 to 5.66). There was no association between polysomnography sleep time and self-reported sleep time (r = 0.09; P = 0.6) or between the Epworth Sleepiness Scale and severity of sleep apnea (r = 0.10; P = 0.5) in the HD population.

LIMITATIONS

The study was limited to participants older than 45 years.

CONCLUSIONS

Kidney failure treated with thrice-weekly HD is significantly associated with poor subjective and objective sleep quality.