Introduction
The life expectancy of people living with human immunodeficiency virus (HIV) (PLWH) has gradually been increasing over the last several decades as a result of advances in antiretroviral therapy (ART) [
1]. HIV is nowadays considered a chronic disease requiring lifelong treatment. Although with significant improvements in HIV-related mortality and morbidity, physical and psychological well-being may be significantly impaired. Patients’ perceived and reported health aspects beyond objectively quantified clinical parameters are summarized as health-related quality of life (HRQL). PLWH consistently report lower HRQL than HIV-negative individuals despite antiretroviral therapy and viral suppression [
2,
3]. Albeit the role of HIV-associated complications and side effects of ART on HRQL, psychosocial factors related to stigma, socioeconomic status, and limited access to social support may be other key determinants of HRQL [
4‐
6]. In an aging HIV population, commonly seen age-related and metabolic comorbidities may further add to the burden on the HRQL [
7].
Metabolic syndrome and its risk factors have been increasing and show a higher prevalence in PLWH compared to the general population [
8]. Treatment with ART and HIV infection is known to be pro-steatogenic with worse metabolic outcomes—dependent on the chosen ART regimen [
9,
10]. Nevertheless, an increasingly sedentary lifestyle with poor dietary and physical habits and a higher age impose an additional threat to the metabolic health of PLWH [
11]. These factors have also led to a rise in the prevalence of hepatic steatosis, negatively impacting the HRQL in PLWH [
12,
13]. In the absence of high alcohol intake and other secondary causes, hepatic steatosis is commonly referred to as non-alcoholic fatty liver disease (NAFLD). In this context, significant fibrosis is deemed a key driver and mediator of disease progression, liver-related complications, and mortality [
14]. In addition, chronic liver diseases have been associated with adverse effects on the HRQL [
15‐
17]. While metabolic risk factors and NAFLD negatively affect mental and physical health in HIV-negative individuals, little is known about their impact on the HRQL in PLWH [
18,
19].
The HRQL can be assessed with either generic (i.e., the EQ-5D-5L) or disease-specific questionnaires [
20,
21]. The medical outcomes study HIV health survey (MOS-HIV) is a disease-specific measure of HRQL and has been validated for use in PLWH and recommended as a suitable measure of HRQL in PLWH [
22,
23]. The MOS-HIV contains ten domains that include HRQL-related aspects affected by liver diseases and other comorbidities [
22]. Although MOS-HIV has been validated and shown to be impaired in PLWH and liver disease, little focus has been given to the impact of hepatic steatosis and significant fibrosis yet [
24,
25].
Currently, only little data is available on hepatic steatosis and fibrosis and their role in affecting the HRQL in PLWH. Therefore, the aim of this study was to explore the association of hepatic steatosis and fibrosis on the HRQL in PLWH using the MOS-HIV survey.
Discussion
In this study, we analyzed the association of hepatic steatosis and fibrosis on the HRQL in PLWH using the MOS-HIV. Although the MOS-HIV is a specific measure of HIV infection, it captures several aspects that are also relevant in assessing patients with liver disease. It combines two summary scores that assess physical (PHS) and mental health (MHS) based on ten domain scores, each evaluating various aspects of someone’s HRQL. In this context, general health perception (GHP) and energy/fatigue (EF) were two of the most burdensome HRQL aspects in this cohort. Arterial hypertension remained an independent predictor of impaired PHS and MHS scores. Lower education and unemployment were independently associated with poor PHS and MHS scores, respectively. To assess the effect of liver disease on the HRQL in PLWH, we included hepatic steatosis and significant fibrosis, measured non-invasively by VCTE, in our analysis. Significant fibrosis remained an independent predictor of a poor HRQL in both summary scores (PHS, MHS), and the GHP domain was the most burdensome in this subgroup. Overall, the lowest PHS and MHS scores were seen in individuals with significant fibrosis.
Despite the impact of hepatic steatosis and fibrosis on the HRQL in HIV-negative individuals, the association in PLWH remains largely unknown. Hepatic steatosis can be an initiating event for more severe liver injury due to inflammation (steatohepatitis) that promotes scarring of liver tissue (fibrosis). Significant fibrosis can lead to severe liver-related complications and higher mortality [
14]. In patients with biopsy-confirmed NASH, inflammation and fibrosis were associated with a lower HRQL [
17]. In this study, significant fibrosis remained an independent predictor of poor physical and mental health (PHS and MHS). These findings were also reflected in lower scores on several domains of the MOS-HIV compared to individuals without fibrosis. Although Henderson et al. analyzed the HRQL in PLWH and liver disease, most patients had hepatitis B and C coinfection, and information on liver fibrosis was not assessed [
24]. Contrary to our previous analysis using a generic HRQL questionnaire (EQ-5D-5L), hepatic steatosis was not associated with a worse HRQL using the MOS-HIV survey in this study [
13]. The metabolic risk profile was more prominent in the subgroup with significant fibrosis. Obesity (≥ 30 kg/m
2) and a high waist circumference may result from poor dietary habits and a lack of physical activity. A lower physical health impacts mental health since the lack of physical activity often aggravates mental well-being in PLWH [
33]. However, physical exercise may not be amenable for all of these patients due to a high BMI and limited adherence to exercise programs [
34]. Sociodemographic factors may also influence these risk factors. Previous studies showed a lower HRQL in PLWH with low income [
35]. A recent study revealed that lower education was associated with poorer metabolic health and a higher prevalence of NAFLD with significant fibrosis [
36]. Here we show that a lower education remains an independent predictor of a poor PHS score. Moreover, the GHP domain showed the lowest scores in this subgroup, which implies a poor personal view of the own health. Overall, PLWH and significant fibrosis may characterize a population at risk that needs closer monitoring and counseling to improve the negative impact on HRQL.
Previous studies have often highlighted a higher prevalence of mental health problems, including anxiety and depression, in PLWH [
37,
38]. In our study, the mental health domain had an overall lower score compared to other domains, although no difference was seen in the fibrosis subgroup. HIV infection and worries related to stigma and the chronic health condition may negatively impact mental health more than other comorbidities [
39]. Unemployment remained an independent predictor of a lower MHS score. Interestingly, role functioning showed one of the lowest scores in the subgroup analysis. Additionally, PLWH with lower education had lower scores in the two domains, role- and social functioning. Sociodemographic factors have shown a high impact on the HRQL in PLWH, suggesting the need for more social support [
2,
35]. Overall, social support may help reduce the effects of HIV-related stigmatization within the context of economic insecurity [
4]. Thus, mental health may also be influenced by socioeconomic status with a significant impact on the HRQL in PLWH.
The energy/fatigue domain showed one of the lowest scores in this study. Fatigue is a common symptom, especially in patients with chronic liver diseases [
15,
16]. In this study, fatigue was more burdensome in the fibrosis subgroup, although with no significant difference between these groups. Therefore, other factors may affect the EF domain more than significant fibrosis in PLWH alone. Although HIV-related parameters showed no association with a lower HRQL in this study, the use of INSTI correlated with the EF domain (data not shown). Common side effects of INSTI are sleep disturbances and depression in some cases [
40]. Moreover, specific ART regimens are known to be pro-steatogenic [
10]. Only recently, an impact of INSTI and TAF on weight gain and an increase in hepatic steatosis has been suggested in PLWH [
9]. Thus, certain therapies for HIV may have opposite effects on metabolic outcomes and the HRQL, although longitudinal studies are needed to verify these results.
The median values of the two summary scores, PHS and MHS, in this study were comparable to an analysis from Ireland, although the median value of MHS was slightly lower [
41]. Similar to our study, the cohort from Ireland included individuals with a well-controlled HIV infection. Despite improvements in the treatment of HIV and lower HIV-related mortality, the HRQL was still lower compared to the general population in the Irish cohort [
41]. However, a comparison to the general population is lacking in our study due to missing data related to MOS-HIV from German HIV-negative individuals. Lower PHS and MHS values were also detected in a Canadian study and one study from China [
42,
43]. The EF and GHP domains showed the lowest scores overall, which is in line with these recent studies [
41,
42]. Overall, cultural and country-specific differences need to be considered in the assessment of HRQL [
37].
Strengths and limitations
This study has several limitations. The cross-sectional design limits the ability to assess causation, and longitudinal studies are needed to determine causality. To assess steatosis and significant fibrosis, we relied on non-invasive tests (NITs), although liver biopsy currently remains the reference standard to define hepatic fibrosis [
44]. On the other hand, liver biopsy has several limitations and therefore is an unsuitable screening tool [
45]. Furthermore, we included patients with mixed etiology of hepatic steatosis, including alcohol intake and secondary causes. However, most PLWH in this cohort fulfilled the criteria of a NAFLD. Although the MOS-HIV has also been validated for use in PLWH and liver disease, it is not a specific measure to assess liver-related HRQL aspects [
24]. Liver-specific questionnaires may not cover all HIV infection and treatment aspects. Moreover, the MOS-HIV covers various domains relevant to other diseases, supporting its use as a generic measure in PLWH and other comorbid diseases [
22]. The strength of this monocentric study is the large and well-characterized cohort of HIV-positive individuals. This study adds evidence on the effect of liver-related comorbidities on the HRQL in PLWH. Moreover, the MOS-HIV allowed identifying significant fibrosis as a negative predictor of physical and mental health. As outlined above, this study shows that significant fibrosis is not merely a clinical parameter but reflects an overall deprived population that requires social support and closer healthcare monitoring.
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.