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Impact of depression on quality of life in systemic lupus erythematosus patients

Abstract

Background

Depression is common in systemic lupus erythematosus (SLE) and is an unmeasured risk factor, yet its symptoms can be neglected in standard disease evaluations. The purpose of this study was to assess the frequency and the impact of depression on quality of life in SLE patients. We recruited 32 patients with SLE and 15 healthy control volunteers in the study. The following investigations were undertaken in each patient: clinical and rheumatologic assessment, SLE Disease Activity Index-2k (SLEDAI-2k), Beck Depression Inventory (BDI), Short-Form Health Survey (SF-36) questionnaire, and routine laboratory tests.

Results

There was a high percentage of depression (46.9%) in the SLE patients. Regarding quality of life (SF-36), there were significant affection of the physical and mental composite summary domains (PCS and MCS) scores in lupus patients compared with controls (P < 0.000 for both) with the same significant in depressed compared with non-depressed patients. SF-36 subscales (physical function, limit emotional, emotional wellbeing, and social function) were significantly affected in depressed lupus patients compared with non-depressed patients. There was a significant negative correlation between the score of MCS domain of SF-36 with BDI (P < 0.000) while positive correlation between SLEDAI score with depression score. In contrast, there were no significant correlations between MCS or PCS with age, duration of illness, or SLEDAI-2K.

Conclusions

Depression is common in SLE patients and had a negative impact on quality of life particularly on MCS domain and positive correlation with disease severity score.

Trial registration

This study was registered on clinical trial with registration number: NCT03165682 https://clinicaltrials.gov/ct2/show/NCT03165682 on 24 May 2017.

Background

Systemic lupus erythematosus (SLE) is a progressive autoimmune disease characterized by a wide range of clinical manifestations and an erratic disease path that includes remissions and exacerbations [1]. Neuropsychiatric systemic lupus erythematosus (NPSLE) is one of the most severe forms of SLE, characterized by psychiatric, central, and peripheral neurological signs and symptoms [2]. The pathogenesis of NPSLE is multifactorial and involves various inflammatory cytokines, autoantibodies, and immune complexes resulting in vasculopathic, cytotoxic, and autoantibody-mediated neuronal injury [3, 4]. Increasing evidence suggests that susceptibility genes play a role in NPSLE manifestations [2]. Koga and colleagues combined the risk alleles of seven genes (BLK, HLA-DRB1, FCy RIIb, IRF5, STAT4, TNFAIP3, and TNFSF13) and discovered that patients with SLE who more than 10 risk alleles had had a higher risk of neurological symptoms than those who had fewer than ten risk alleles [5]. This explained the wide range of depression in SLE patients.

The most common microscopic brain finding in SLE seems to be microvasculopathy although not specific, which may be due to complement activation and antiphospholipid antibodies [6]. Using structural MRI, 40–80% of abnormalities in NPSLE are multiple discrete lesions concentrated in periventricular and subcortical white matter [7]. Metabolic neuroimaging (positron emission tomography/PET, MR spectroscopy) and perfusion imaging (single photon emission computer tomography/SPECT) can detect abnormalities in patients who present exclusively with psychiatric manifestations. The fluorodeoxyglucose-PET (FDG-PET) imaging can demonstrate white matter hypometabolism of the parieto-occipital in up to 80% of patients [8,9,10]. The functional near infrared spectroscopy (fNIRS) neuroimaging could also be used to elucidate the pathophysiology of psychiatric disorders and identify neurophysiological differences between co-occurring psychiatric disorders [11, 12].

Patients with major depressive disorders had smaller changes in oxyhemoglobin in the frontal and temporal cortices than normal. Hemodynamic response measured by fNIRS during an English letter fluency task is a promising biomarker for major depressive disorders [11, 12].

Over the past few decades, deaths in people with systemic lupus erythematosus (SLE) have declined [13], allowing care to be refocus on improving health-related quality of life (HRQoL), including effects on an individual’s physical, mental, and social function [14]. Like other chronic conditions, SLE patients have a lower HRQoL [15, 16].

Factors that have a negative effect on HRQoL, such as pain, and depression, should be given special consideration, according to the Treat to Target (T2T) guidelines for SLE [17]. Major depression is common in SLE, yet its symptoms are often neglected in standard disease evaluations [18, 19]. A previous study reported a link between major depression in SLE and lower HRQoL [20]. However, details of the relationship, in particular the effects of depression on domains of the HRQoL are not well understood [21]. The present study aimed to determine the impact of major depression on the quality of life of SLE-relevant health domains and to evaluate other possible risk factors that can affect the quality of life.

Methods

This case-control study was conducted at the Assiut University Hospital in the period between May 2019 and August 2020. Patients were recruited from the outpatient clinics and inpatients of the Physical Medicine, Rheumatology and Rehabilitation Department, in collaboration with Neuropsychiatry Department, Assiut University Hospital. All the recruited SLE patients had fulfilled the 2012 Systemic Lupus International Collaborating Clinics (SLICC) classification criteria for SLE [22]. The sample size was estimated using the EPI info statistical package Version 7. The used parameters for determining sample size were a proportion of 0.5, a confidence level of 95% and a margin of error of 5%. In this study, we used a systematic random sample as the first participant who fulfills the study criteria was randomly selected. Then, every second participant was recruited in the study.

A total of 47 participants were recruited; 32 SLE patients met the principal eligibility criteria required for SLE [22], and 15 healthy volunteers matched for age, sex, total years of education, and social backgrounds, were taken as a control group.

The inclusion criteria were (a) age 18 years or older; (b) a consistent drug therapy for the prior three months in SLE patients; (c) no comorbid severe medical conditions such as diabetes, congestive heart failure, or fibromyalgia.

We excluded participants if they had (a) a diagnosis of any other systemic autoimmune disorders; (b) a history of depression before the diagnosis of SLE; (c) pregnancy.

All eligible participants for this study had the following: sociodemographic data included age, sex, employment status, and educational level. For patients with SLE, disease variables such as disease duration (years) and other disease characteristics were also recorded. All study participants underwent a complete medical history and thorough physical examination including neurological system examinations and psychiatric interviews. For patients with SLE, assessment of disease activity was evaluated using the Systemic Lupus Erythematosus Disease Activity Index-2k (SLEDAI-2k), which covers clinical (16 items) and laboratory (8 items) variables [23]. Routine laboratory tests were performed, including complete blood count (CBC), blood sugar, and 24-h urine protein.

The Arabic version of Beck Depression Inventory (BDI) [24]

This instrument is a self-reported questionnaire of depressive symptoms over the last 2 weeks, consisting of 21 questions concerning the different domains of depression with a total score ranging from 0 to 63 [25]. All responders scoring higher than 13 points on the BDI were subjected to detailed interviews with research workers trained in mental health.

The Arabic version of the Short-Form Health Survey (SF-36) questionnaire [26, 27]

It consists of 36 items measuring 8 subscales: physical function, social function, and role limitations due to physical health problems, role limitations due to emotional problems, mental health, vitality, bodily pain, and general health perceptions. The subscale and summary scores on the SF-36 range from 0 to 100, with higher scores indicating better HRQoL [28].

Statistical analysis

Software (SPSS, Version 20.0 for Windows, SPSS Inc., Chicago, IL) was used for analysis of the data. To compare demographic and clinical data among groups, the Mann-Whitney test was used. The median ± standard deviation was used to express continuous variables, while number and percentage were used to express categorical variables. To compare the means of more than two groups, the Kruskal-Wallis H test was used. When the P value was less than 0.05, it was considered significant. A non-parametric Spearman’s correlation coefficient test was used to investigate correlations between various clinical scales and quality of life parameters because of the abnormal data distribution detected by Shapiro test.

Results

Sociodemographic and clinical characteristics

Table 1 showed that absence of significant differences in age or education level between the patients and controls. However, there were more non-workers in the SLE group than in the controls. The SLE group with depression had a higher percentage of most clinical signs compared to the non-depressed group but was significant only for arthritis (P = 0.046) (Table 2). There were no significant differences in any of the laboratory investigations between depressed and non-depressed SLE patients.

Table 1 Demographic data of studied groups (SLP group and control group)
Table 2 Duration of illness, clinical symptoms, and laboratory data in relation to depression

Regarding HRQoL (SF-36), there were significant affection of the PCS and MCS scores (lower mean score of the both) in lupus patients compared with controls (P = 0.000 for both) with the same significant in depressed patients compared with non-depressed patients.

Concerning the subscales of SF-36 (physical function, limit emotional, emotional wellbeing, and social function), all were significantly affected in depressed lupus patients compared with non-depressed patients. Details illustrated in Table 3.

Table 3 The impact of depression on quality of life (SF-36 score)

In Table 4, there was a significant negative correlation between the score of MCS domain of SF-36 with BDI (P < 0.000) while positive correlation between SLEDAI score with depression score. In contrast, there were no significant correlations between MCS or PCS with age, duration of illness, or SLEDAI-2K (Table 5).

Table 4 Correlation between Beck’s Depression Inventory total score and age, duration of illness, SLEDAI-2K, physical composite scale (PCS), and mental composite scale (MCS) in SLP patients
Table 5 Correlation between age, duration of illness, SLEDAI-2K with physical composite scale (PCS), and mental composite scale (MCS) in SLP patients

Discussion

The important findings in this study are the high percentage of depression in SLE and its negative impact on HRQoL. This contrasts with the absence of significant impacts of the age, duration of illness, and the disease activity as measured by the SELDI scale on HRQoL.

In the current study, most (89.4%) of the patients were female, as in the Mork study which had 92% women [29]. This is consistent with recent systematic reviews which reported that females had a higher frequency of SLE than males, with a sex ratio ranging from 2:1 [30] to 15:1 [31]. The majority of the participants were not in work and had only primary education. Previous studies found that unemployment and lower education levels are associated with depression [32,33,34,35].

Our patients were classified into depressed (15 cases 46.9%) and non-depressed groups (17 cases 53.1%) according to their BDI scores. In previous studies, the incidence of depression has varied widely from 8.7 to 78.6%. This wide range may be a consequence of the lack of clarity in the diagnosis of depression and use of different measurement scales or may be related to medical treatment. In a recent systematic review and meta-analysis of 69 studies with a total population of 23,386, the overall prevalence of depression among SLE patients was 35% [36].

In the present study, SLE patients with depression had significantly (0.04) higher % of arthritis compared with non-depressive patients, while no significant differences between groups in other clinical and laboratory data. Dimattew and colleagues also reported that depression could negatively affect treatment outcomes through non-adherence to recommended treatments and clinic appointments [37]. However, when patients are treated promptly, mood disorders could be resolved in around 50% of patients with SLE [38]. Therefore, recognition of depression and providing adequate treatment for it are essential aspects of optimal management of SLE.

Make and colleagues 2011 reported that anxiety in SLE patients could be predicted by the presence of depression, high dose of cumulative glucocorticoid, and other regular medications. The severity of depression predicted both the severity and presence of anxiety. Hence, lupus patients who demonstrated anxiety should concomitantly and properly be evaluated for depression [39]. Unfortunately, we did not assess the anxiety in the current study and added it as one of limitation of the study.

Skapinakis and colleagues observed that depression could act as independent risk factors in general health care [40]. The SLEDAI-2K scale that measures SLE’s activity showed no significant differences between depressed versus non-depressed groups and had no significant correlation with HRQoL (SF-36). This suggests that other issues could contribute to the SLEDAI-2K scores, such as fatigue, difficulty to arrange events/meetings due to the disease’s unpredictable course, and a lack of disease awareness in the workplace [41].

The present study showed that SLE patients with depression had worse (lower) SF-36 score than patients without, particularly in physical function, limited emotions, energy/fatigue, and emotional well-being, all of which have an impact on QoL. This was confirmed by the significant inverse correlation between BDI and SF-36. A similar finding was noted by Bertsias and colleagues who recorded that depression was associated with a low HRQoL [42]. The patient’s internal understanding of coping with the condition impacts QoL. It suggests a strategy to deal with the disease: with everyday tasks and an expression of hope for a better life [43]. As a result, in daily clinical practice, SLE patients’ HRQoL is linked to depression and fatigue to varying degrees.

One of the important limitations of the present study is the small sample size, since large sample sizes are recommended in studies that examine the impact of anxiety and medical treatment on quality of life. This study mainly used self-reported questionnaire (Beck Depression Inventory) to measure psychiatric symptoms and did not make clinical diagnosis. The gold standard for establishing psychiatric diagnosis involved structured clinical interview and functional neuroimaging [11, 12]. Screening for other comorbid psychiatric disorders in SLE patients is also recommended.

Conclusion

The present study demonstrated that depression is common in SLE patients and had a negative impact on HRQoL particularly mental function and increase with disease severity.

Availability of data and materials

All data generated or analysed during this study are available from corresponded on request.

Abbreviations

SLE:

Systemic lupus erythematosus

SLEDAI-2k:

Systemic Lupus Erythematosus Disease Activity Index-2k

BDI:

Beck Depression Inventory

MFIS:

Modified Fatigue Impact Scale

SF-36:

Short-Form Health Survey

HRQoL:

Health-related quality of life

QoL:

Quality of life

NPSLE:

Neuropsychiatric systemic lupus erythematosus

fNIRS:

The Functional near infrared spectroscopy

SLICC:

Systemic Lupus International Collaborating Clinics

PCS:

Physical composite scale

MCS:

Mental composite scale

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Contributions

EK and GA recruited participants, analysis, and interpreted data, and were the contributors in writing the manuscript. SR and RG revised data interpretation, read, and approved the final manuscript. MJ helped in data entry, analyze, and generate result sheets. All authors have read and approved the manuscript.

Corresponding author

Correspondence to Eman M. Khedr.

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Ethics approval and consent to participate

This study had ethical approval from Institutional Review Board (IRB) of Faculty of Medicine, Assiut University with Approval Number (IRB17100158). This study was registered on clinical trial with registration Number (NCT03165682) https://clinicaltrials.gov/ct2/show/NCT03165682 on 24 May 2017. Written informed consent was obtained from patients to participate in the study. All procedures performed in this study were in accordance with the ethical standard of the institution and/or national research committee and with the 1964 Helsinki Declaration and its later amendments.

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Khedr, E.M., Gamal, R.M., Rashad, S.M. et al. Impact of depression on quality of life in systemic lupus erythematosus patients. Egypt J Neurol Psychiatry Neurosurg 57, 88 (2021). https://doi.org/10.1186/s41983-021-00343-y

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Keywords

  • Systemic lupus erythematosus
  • Pain
  • Depression
  • Disease activity
  • Physical health