RELIABILITY OF THE FATIGUE SEVERITY SCALE IN CIRRHOTIC AND CORRELATION WITH DEPRESSION AND QUALITY OF LIFE: preliminary assessment

Confiabilidade da escala de gravidade de fadiga em cirróticos e correlação com depressão e qualidade de vida: avaliação preliminar

ABSTRACT

Background

Fatigue is a common complaint in patients with liver disease and may be considered a disabling symptom, affecting their quality of life and mental health. The Brazilian version of the Fatigue Severity Scale showed sensitivity to assess fatigue in some populations, but has not been tested in cirrhotic individuals.

Objective

The aim of this study was to evaluate the reliability of the Fatigue Severity Scale and association with depression and quality of life in patients with liver cirrhosis.

Methods

A prospective cohort study where the same interviewer applied to 25 patients Fatigue Severity Scale questionnaires, Brazilian version of the Beck Depression Inventory II (BDI- II) and Brazilian version of the Short Form Health Survey II (SF-36 v.II). Evaluating the reliability of the Fatigue Severity Scale through internal consistency and reproducibility was conducted.

Results

Statistical analysis showed strong internal consistency (Cronbach's alpha = 0.917) and intraobserver reproducibility test, there was no significant difference between both moments (P=0.828). Fatigue Severity Scale was significantly associated with BDI- II (r=0.478; P=0.016) and quality of life in areas PF (r=-0.484; P=0.014), BP (r=-0.402; P=0.046) and GH (r=-0.406; P=0.044) and SF (r=-0.520; P=0.008).

Conclusion

The Fatigue Severity Scale showed satisfactory reliability in evaluation of fatigue in cirrhotic and can be used as a tool for this purpose. Fatigue is related to depression and quality of life in the physical aspects domains, pain, general health and social aspects.

HEADINGS
Reproducibility of results; Fatigue; Liver cirrhosis; Depression; Quality of life

RESUMO

Contexto

A fadiga é uma queixa comum em indivíduos com doença hepática e pode ser considerado um sintoma incapacitante, afetando sua qualidade de vida e saúde mental. A versão brasileira da Fatigue Severity Scale mostrou sensibilidade para avaliar a fadiga em algumas populações, mas ainda não foi testada no indivíduo cirrótico.

Objetivo

Avaliar a confiabilidade da Fatigue Severity Scale e correlação com a depressão e qualidade de vida em indivíduos com cirrose hepática.

Métodos

Estudo prospectivo de coorte, onde o mesmo entrevistador aplicou a 25 pacientes os questionários Fatigue Severity Scale, versão brasileira do Beck Depression Inventory II (BDI- II) e versão brasileira do The Short Form Health Survey II (SF-36 v.II). Foi realizada a avaliação da confiabilidade da Fatigue Severity Scale através da consistência interna e reprodutibilidade.

Resultados

A análise estatística mostrou forte consistência interna (alfa de Cronbach = 0,917) e no teste de reprodutibilidade intraexaminador, não houve diferença significativa entre os dois momentos avaliados (P=0,828). Fatigue Severity Scale mostrou associação significativa com BDI- II (r=0,478; P=0,016) e qualidade de vida nos domínios PF (r=-0,484; P=0,014), BP (r=-0,402; P=0,046) e GH (r=-0,406; P=0,044) e SF (r=-0,520; P=0,008).

Conclusão

A Fatigue Severity Scale apresentou confiabilidade satisfatória na avaliação de fadiga em cirróticos e pode ser utilizada como ferramenta para esta finalidade. A fadiga se correlacionou com depressão e qualidade de vida nos domínios aspectos físicos, dor, estado geral de saúde e aspectos sociais.

DESCRITORES
Confiabilidade dos testes; Fadiga; Cirrose hepática; Depressão

INTRODUCTION

Fatigue is a common complaint in individuals with chronic liver disease and may be considered a disabling symptom. Its pathogenesis is generally multifactorial. Patients with cirrhosis often undergo psychological stress and potentially debilitating complications such as hepatic encephalopathy⁴, hepatocellular carcinoma or malnutrition can lead to physical and cognitive weakness. Numerous instruments have been used for evaluation and impact of fatigue in patients with liver disease, but research on the etiology and treatment of fatigue has been hampered by the lack of relevant measures, reproducible severity of fatigue. The Fatigue Severity Scale was initially developed for evaluation of fatigue in multiple sclerosis³. Validated in Brazil^5,6, the instrument evaluates the effects of fatigue on motivation, exercise and physical functioning of the individual as well as its interference in work, family and social life. It has shown sensitivity in the evaluation of different aspects regarding the severity and intensity of fatigue, such as social, physical or cognitive, but has not been tested in cirrhotic individuals.

The aim of this study was to evaluate the reliability of the FSS and correlation with depression and quality of life in patients with liver cirrhosis.

METHODS

Prospective cohort study pilot developed in Liver Transplant Outpatient Clinic of Hospital Santa Clara Brotherhood of Santa Casa de Porto Alegre, RS, Brazil, where 25 patients with cirrhosis, clinically stable, responded to fatigue questionnaires, depression and quality of life, between January and April 2015. Patients with any other disease of the liver that cause functional limitations and fatigue, those with cognitive impairment that prevented the understanding of the assessment process. This study was approved by the Institutional Ethics Committee (protocol number 937192) and all participants signed an informed consent form. The same interviewer applied the questionnaires to patients, performing the reading of questions and the interviewee pointing responses. Depression was assessed by the Brazilian version of the Beck Depression Inventory-II (BDI- II) with 21 items and a 4-point scale response, ranging from 0 (lowest) to 3 (severe). The total score ranges from 0 to 63. Cutting pattern for the general population are: 0-9: minimum depression; 10-18: mild depression; 19-29: moderate depression; 30-63: severe depression². The Brazilian Portuguese version of the 36-item Medical Outcomes Study Short-Form Health Survey version II (SF-36 v.II) was used to assess quality of life¹. The same consists of eight fields, punctuated 0-100 (physical functioning, physical role, bodily pain, general health, vitality, social functioning, emotional, mental health). Higher scores indicate better physical, emotional and social functioning. The Brazilian version of the Fatigue Severity Scale was used to assess fatigue and consists of nine statements that assess the overall effect of fatigue on motivation, physical functioning and interference with socioeconomic factors. Each item is rated on a Likert 7-point scale: 1 (strongly disagree) to 7 (strongly agree). The total score ranges from 1 to 7 and is calculated as the mean response for all questions³. To determine the reproducibility of the FSS, the scale was applied at two times the same patient by the same person, with a maximum interval of 2 months between assessments (test and retest). Data analysis was performed using the Statistical Package for Social Sciences, version 16.0. Descriptive statistical analysis was used to characterize the demographic, anthropometric and clinical patients, depending on the type of variable distribution and data. The intraclass correlation coefficient (ICC), with its 95%, and paired t-test were used to assess the reproducibility of the two-step evaluation of the patient. The relationship between the FSS, depression and quality of life, the Pearson correlation coefficients were used. The level of statistical significance was P<0.05. Internal consistency was assessed by Cronbach's alpha.

RESULTS

Of the thirty-four patients were enrolled in the study, 25 met the inclusion criteria. Six patients were excluded because they presented interval greater than 2 months to re-test and three were still without definite diagnosis awaiting tests. The mean age was 55.4±7.1 years and 68% were male. Regarding education, 48% had not completed elementary school. The etiologies, 40% was for HCV and 24% alcoholic cirrhosis. The mean MELD score was 14.2±3.2. Child B represented 61.5% of the sample. They made use of antidepressants 24% of patients, and patients enrolled, 4% were already transplanted. Statistical analysis showed good internal consistency (Cronbach's alpha=0.917). As for reproducibility, there was no significant difference between the times D1 and D2 (P=0.828) as Figure 1. The study found an association of FSS with SF 36 v.II in physical functioning (PF) areas (r=-0.484, P=0.014), bodily pain (BP) (r=-0.402, P=0.046), general health (GH) (r=-0.406, P=0.044) and social functioning (SF) (r=-0.520 P=0.008) with the BDI-II (r=0.478; P=0.016) as shown in Table 1.

FIGURE 1
Reproducibility. Test: a first assessment; Retest: a second evaluation held variable period but not exceeding 60 days.

TABLE 1
Construct validity

Scales n = 25	FSS Correlation coefficient (P-value)
BDI	0.478 (0.016)*
SF-36
PF	-0.484 (0.014)*
RP	-0.298 (0.148)
BP	-0.402 (0.046)*
GH	-0.406 (0.044)*
VT	-0.340 (0.096)
SF	-0.520 (0.008)*
RE	-0.279 (0.177)
MH	-0.265 (0.200)

• * P<0.05. FSS: Brazilian Portuguese version of the Fatigue Severity Scale; BDI: Beck Depression Inventory; SF-36: Short Form -36; PF: physical functioning; RP: role physical; BP: bodily pain; GH: general health; VT: vitality; SF: social functioning; RE: role emotional; MH: mental health.

DISCUSSION

Fatigue is often associated with a degree of persistent failure and although its measurement is performed frequently, the lack of appropriate tools makes it difficult to review. These instruments can be single or multiple dimensions. The one-dimensional scales provide a global measurement of the intensity of fatigue, such as FSS. Multidimensional scales provide more information on the characteristics of fatigue or of its impact. For instruments considered suitable for clinical or research use in countries where these have not been developed, it is necessary to assess the reproducibility⁷, which is defined as the ability of an instrument to present little or no variability to be used at different times. Internal consistency, measured by Cronbach's alpha coefficient revealed that the level of reliability of the collected values is high, demonstrating good reliability for this version of the scale in the assessment of fatigue in patients with cirrhosis. The fact that there was no statistical difference in scores between test and retest, shows that the FSS has good reproducibility in this population. The FSS correlated strongly with depression, indicating that the higher the degree of fatigue, the greater the chance the patient has this symptom. Similarly, FSS correlates with the quality of life, suggesting that the more severe fatigue, greater impact on quality of life. In this pilot study, this impact was more pronounced in relation to functionality, pain, overall health and social aspect. Twenty-five patients were included in the study, most with Child B. Some of the patients were using antidepressants, and have not been excluded. These results are preliminary and will be applied other tests to confirm the validity and reliability. With larger sample, patients will be classified according to clinical categorization through the MELD and Child. It is expected that there are other combinations of those observed in this study.

CONCLUSION

The preliminary evaluation suggests that the FSS has a satisfactory reliability in evaluation of fatigue in cirrhotic and can be used as a tool for this purpose. This study also found strong association of fatigue with depression and impaired quality of life and physical functioning, bodily pain, general health and social function.

REFERENCES

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• 2
  Disclosure of funding: no funding received
• Support: Higher Education Personnel Improvement Coordination (CAPES).

Publication Dates

• Publication in this collection
  Jul-Sep 2016

History

• Received
  16 Jan 2016
• Accepted
  15 Mar 2016