Abstract
(1) Background: we aimed to describe the disease-specific quality of life (QoL) of ischemic stroke patients treated with acute revascularization therapy, its evolution from 6 months to 12 months, and associated factors. (2) Methods: QoL was assessed with the SS-QoL in consecutive patients treated with either intravenous thrombolysis (IVT) and/or mechanical thrombectomy (MT). Variables associated with QoL scores and its evolution were studied using multivariate mixed models, and interaction with time. Analyses were performed in four domains of SS-QoL: self-care, mobility, mood, and social roles. (3) Results: Among the 501 included patients (mean (sd) age 68.9 (14.5), 49% women), lower post-stroke QoL was independently related to lower level of school education, prestroke mRS > 2, and 24 h NIHSS score > 4. Independent predictors of unfavorable evolution of QoL over time were age <75 years (Mobility p = 0.0194 and Mood p = 0.0015), NIHSS score ≤ 4, (Self-care p = 0.0053 and Mood p = 0.0048), and modified Rankin Scale score ≤ 2 (Social roles, p = 0.0006). Revascularization therapy had no significant effect on the QoL scores, but patients treated with MT (alone or as bridging therapy) had significantly greater improvement in mobility score between 6 and 12 months than patients treated with IVT alone (p = 0.0072). (4) Conclusion: QoL evolution over one year had only slight variation and was associated with the modalities of acute treatment, age, and stroke severity.
1. Introduction
More than 110,000 new cases of stroke are reported each year in France, and the absolute number is on the rise due to the aging population []. While prevention remains a major challenge, considerable progress was made in acute stroke treatment over the past years, namely revascularization therapy including either intravenous thrombolysis (IVT) and/or mechanical thrombectomy (MT). This contributed to a better post-stroke outcome of patients with a decrease in case-fatality and a higher number of stroke survivors, thus involving significant impact on healthcare system resources [,]. Despite these improvements, stroke remains a disabling disease. The quality of life (QoL) of patients in the post-acute phase of ischemic stroke is still very much affected, and its evolution over time has been shown to depend on many factors such as the area of the brain affected [], the delay in treatment administration, and the functional outcome of patients [,]. Although the effectiveness of therapeutic strategies in acute ischemic stroke in reducing motor disability has been widely demonstrated by randomized clinical trials [,], their impact on patients’ QoL remains poorly evaluated. Few studies addressed this issue, most of them being limited to an evaluation of patients after a short period of three months following stroke [,,,], and there is very little data on QoL after six months among patients treated by IVT, MT or combined treatment [,,]. The use of a disease-specific questionnaire may allow investigating specific concerns of stroke patients with a better sensitivity to change than generic questionnaires. The Stroke-Specific Quality-of-Life (SS-QoL) scale is a specific instrument that assesses the QoL of stroke patients. An adaptation and validation of the initial version was proposed by a study carried out by our team []. This instrument showed satisfactory psychometric properties in terms of validity, reliability, and responsiveness [,]. It was designed to be self-administered or even administered by telephone [] with a good reliability except in aphasic patients. It differs from other instruments (e.g., Stroke Impact Scale [SIS]) by its shorter administration time [] and after several evaluations is recognized as one of the most comprehensive measures of quality of life after stroke []. For patients and clinicians, knowledge of the determinants of the QoL in stroke survivors who received revascularization therapy would help to predict the evolution of the impact of the disease on patients’ lives.
The aim of our study was to describe variables associated with disease-specific SS-QoL scores and its evolution between 6 and 12 months in stroke patients treated with IVT and/or MT.
2. Materials and Methods
2.1. Patients and Design
The Prognosis After Revascularization therapy in the Dijon Ischemic Stroke Evaluation (PARADISE) Study was a single-center prospective observational cohort study conducted from January 2016 to June 2019 at Dijon University Hospital (NCT02856074). Consecutive patients aged 18 years or older were included if they had acute ischemic stroke treated with revascularization therapy (either IVT and/or MT). Patients received information about the study and gave their oral consent to participate according to the French legislation. The study was approved by a French ethic committee (CCP Est I, IRB number: 2015-A01664-45).
2.2. Data Collection and Patients’ Follow-Up
At inclusion, several data were collected including sociodemographic characteristics (sex, age, occupation, marital status), medical history including vascular risk factors, and prestroke treatments. Premorbid handicap was assessed using the modified Rankin scale (mRS) score. Stroke severity was quantified at admission and at 24 h by the National Institutes of Health Stroke Scale (NIHSS) score. Patients were followed by a phone contact at 3 months, a face-to-face visit with a stroke-trained neurologist at 6 months and a last phone contact at 12 months. During each visit the functional status of patients was assessed by the mRS score. Patients’ QoL after stroke was evaluated at 6 months and 12 months with the French version of the SS-QoL, a 49-item scale in 12 domains, namely Self-care, Fatigue, Mobility, Mood, Social Role, Family Role, Language, Character, Productivity/Work, Memory/Concentration, Vision, and Upper Extremity Function. This scale had been cross-culturally validated into the French language []. The score in each domain was transformed into a score from 0 (worst QoL) to 100 (best possible QoL). Patients with severe aphasia or dementia, who were not able to complete the questionnaire, were not assessed. For the present study, we analyzed data from subjects enrolled in the PARADISE study for whom the SS-QOL score was recorded at 6 months and/or 12 months.
2.3. Statistical Analyses
Categorical variables were described as frequencies and percentages, quantitative variables as means ± standard deviation. We compared the characteristics of patients with SS-QoL score data available at 6 or 12 months to those of patients who did not complete the questionnaire using Fisher exact test, Chi-2, or a Mann-Whitney test, when appropriate. The QoL scores were described as well as their respective evolution between 6 months and 12 months. The relationships between each independent variable and QoL scores were studied in a linear random-effects model (mixed model) that allowed repeated measurements to be taken into account, even in the case of missing data at either of the two measurement periods. QoL score in a given domain was modelled as the dependent variable. Thanks to this approach, we modelled the effect of each independent variable, as well as the effect of time (6 or 12 months), and of the time * variable interaction. Briefly, random-effects model allows one to take into account the correlation between 6- and 12-month measurements for a given patient. A significant time effect indicated a change in the quality-of-life score between 6 and 12 months, a significant variable effect indicated an overall difference in QoL between the two groups, and a significant time * variable interaction an increase (or a decrease) in the QoL difference between the two groups between 6 and 12 months. Independent variables with a significant effect on QoL in the previous analysis were proposed for entry into a multivariate mixed model with a manual backward selection procedure and a variable exit threshold set at 0.10. The final model fit was checked according to Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC). These analyses were performed separately for 4 domains of the SS-QoL: Self-care, Mobility, Mood, and Social Roles. For patients for whom QoL data were missing at only one of the two time points (6 or 12 months), the available data were included in the analysis. A sensitivity analysis was performed on the complete data. Statistics were performed using SAS® 9.3 software (Cary, NC, USA).
3. Results
3.1. Patients’ Characteristics
Between January 2016 and June 2019, 900 patients were included in the PARADISE study. SS-QoL data were missing for 399 (44%) patients, 199 of whom died before 6 months. Among the 501 patients included in the present analysis, SS-QoL data were available at both time points (6 and 12 months) for 281 (56%) patients, only at 6 months for 131 patients (26%) patients, and solely at 12 months for 89 patients (18%) (Figure 1).
Figure 1.
Participant selection flowchart.
Patients who completed the SS-QoL questionnaire were significantly younger (mean age ± SD: 68.9 ± 14.5 vs. 76.7 ± 13.2 years, p < 0.001), less often institutionalized before stroke (5% vs. 11%, p < 0.001), and treated significantly more often with IVT alone (55% vs. 39%, p < 0.001) compared to patients who did not (Table 1). The included participants had a lower NIHSS score at 24 h (mean (SD): 5.5 ± 5.4 vs. 13 (8.5), p < 0.0001). Among the 501 analyzed patients, 247 (49%) were women, 270 (55%) received IVT only, 121 (24%) MT only, and 104 (21%) combined therapy. The median (IQR) age was 70 (60–80).
Table 1.
Baseline characteristics of patients enrolled in the PARADISE study according to their inclusion in the QoL analysis.
3.2. Description and Time Evolution of SS-QoL Scores
In the studied domains of QoL, on a scale ranging between 0 and 100 (100 being the best QoL), median scores ranged between 80 to 100 at 6 months and between 90 and 100 at 12 months (Table 2). The best scores were observed in the Self-care domain (median at 6 and 12 months: 100) and the worst in the social roles domain (median at 6 and 12 months at 80 and 90, respectively). There was a trend toward improvement in QoL scores between 6 and 12 months for the self-care, mobility, and social roles domains (mean (SD) improvement +1.8 (13.6), +1.9 (17.7), and +3.8 (28.7), respectively), and a small decrease in the mean score for the mood domain of −0.26 (21.0).
Table 2.
SS-QoL quality of life scores at 6 and 12 months.
3.3. Time-Adjusted Bivariate Analysis
There was significant improvement in QoL scores from 6 to 12 months in all 4 domains studied in all models (Table 3). Female sex, age > 75 years, school level less than high school diploma, hypertension, renal failure, and pre-stroke mRS score > 2 were significantly associated with lower scores in all explored domains except mood (p < 0.05 in self-care, mobility, and social roles domains). Atrial fibrillation was associated with a lower QoL in the self-care (p = 0.0017) and mobility (p = 0.0024) domains. Underweight and obstructive sleep apnea (OSA) syndrome were associated with lower scores for self-care (p = 0.0247 and p = 0.0312, respectively). Patients who received combined treatment (IVT + MT), and those with a higher NIHSS score at 24 h (between 5 and 20) had a significantly lower QoL in the mood domain than those who received IVT alone, or those with a 24-h NIHSS score ≤ 4 (p = 0.001 and p < 0.0001, respectively).
Table 3.
Bivariate association between initial patient characteristics and SS-QoL outcome adjusted on time.
The observed difference in self-care scores narrowed significantly over time between groups defined by a NIHSS score at 24 h ≤ 4 vs. 5–15, and age over versus below 75 years (interaction p < 0.0001 and 0.0189, respectively, Figure 2).
Figure 2.
Mean self-care score at 6 months and 12 months according to patients’ characteristics.
For mobility scores, the observed difference was significantly reduced over time between groups defined by age ≥ 75 or <75 years, by treatment with IVT alone versus combined therapy (interaction p 0.0464 and 0.0484, respectively, Figure 3).
Figure 3.
Mean mobility score at 6 months and 12 months according to patients’ characteristics. PAD, peripheral artery disease; CKD, chronic kidney disease.
Regarding mood, the observed difference in scores narrowed significantly over time between groups defined by age ≥ 75 vs. <75 years, by NIHSS score at 24 h ≤ 4 vs. >20 (interaction p 0.0026 and 0.0053, respectively, Figure 4).
Figure 4.
Mean mood score at 6 months and 12 months according to patients’ characteristics.
The observed difference in social roles scores narrowed significantly over time between groups defined by treatment with IVT alone vs MT alone, by a prestroke mRS score ≤ 2 vs. >2 (interaction p 0.0095 and 0.0016, respectively, Figure 5).
Figure 5.
Mean social roles score at 6 months and 12 months according to patients’ characteristics. CKD, chronic kidney disease.
3.4. Multivariate Analysis
In multivariate models, there was no significant effect of time on QoL scores outside of the social roles domain. Factors associated with QoL in stroke survivors in the final multivariate model are described in Table 4 and Table 5. Factors independently associated with a lower mobility score were age > 75 years, education level below a high school diploma, peripheral arterial disease (PAD), prestroke mRS > 2, and 24-h NIHSS score > 4 (p < 0.0001, 0.0399, 0.0221, <0.0001, and <0.0001, respectively).
Table 4.
Multivariate analysis of characteristics associated with the SS-QoL domains self-care and mobility.
Table 5.
Multivariate analysis of characteristics associated with SS-QoL domains mood and social roles.
Regarding self-care, the independent associated factors were age over 75 years, school level less than high school diploma, pre-stroke mRS score > 2, and 24-h NIHSS score > 4 (p < 0.0001, 0.0244, 0.0006, and <0.0001, respectively). The change over time in the self-care score was modified by OSA and NIHSS at 24 h (p = 0.0337 and 0.0053 respectively).
Concerning the mood score, the independent factors associated were age over 75, type of treatment MT, and NIHSS score at 24 h between 5 and 15 (p = 0.0416, 0.03 and 0.0003 respectively). A significant interaction with time was noted for age and NIHSS score at 24 h (p = 0.0015 and 0.0048 respectively).
Finally, regarding the social roles domain, the independent factors associated were chronic kidney disease, pre-stroke mRS score > 2, and 24-h NIHSS score > 4 (p = 0.0097, <0.0001, and <0.0001, respectively). A significant interaction with time was observed for the pre-stroke mRS score (p = 0.0006).
Patients aged 75 years or older had a greater improvement in mobility and mood from 6 to 12 months (p for interaction with time: 0.0194, 0.0015 respectively), compared to younger subjects. Those with OSA had a greater improvement in self-care between 6 and 12 months (p for interaction with time: 0.033) compared to patients without OSA. Patients who received combined therapy had a greater improvement in mobility between 6 and 12 months (p for interaction with time: 0.0072), compared to those who received IVT alone. Moderate to severe pre-stroke disability (mRS > 2) was associated with a greater improvement in social roles score between 6 and 12 months (p for interaction with time: 0.0006) compared with subjects with a mild or no pre-stroke disability (mRS ≤ 2). Patients with NIHSS score > 20 had greater improvement in self-care than those with NIHSS scores between 0 and 4 at 24 h. Patients with NIHSS scores between 5 and 15 at 24 h had greater improvement in mood between 6 and 12 months (p for interaction with time: 0.0053, 0.0048, respectively) than those with mild severity (NIHSS 24 h between 0 and 4).
4. Discussion
To the best of our knowledge, our study is the first to describe the evolution of SS-QoL scores in the first year after ischemic stroke in patients treated with acute revascularization therapy. Depending on the domain studied, lower post-stroke QoL was independently related to lower level of school education, prestroke mRS > 2, and 24 h NIHSS score > 4. These results support previous data: the social role was the most impacted of the domains as previously described []. Moreover, age over 75 years [,], low educational level [], high prestroke mRS (>2) [,,], and NIHSS score at 24 h > 4 [,,,,] have been reported to be associated with poor quality of life in previous studies.
Remarkably, changes in QoL scores between 6 and 12 months were not significant in multivariate analysis outside the Social Roles domain. This result is surprising, as the Social Roles domain has been reported [] as one of the least sensitive domains to change in the SS-QoL (SRM for improvement: 0.04). This suggests that change in this domain is likely important. The lack of significant change in the Self-Care domain despite its good responsiveness [] (SRM for improvement: 0.86) supports the hypothesis that patients’ perceptions of their ability to self-manage do not change much in the first year in our sample. This is likely due to the selection of the most autonomous patients, resulting in a ceiling effect of responses at the 6-month visit (median score: 100), as the frailest patients were unable to answer the questionnaires.
However, some variables defined different patterns of change in the QoL scores. The predictors of unfavorable evolution of QoL over time were age < 75 years (self-care, mobility, and mood domains), NIHSS score ≤ 4, (self-care and mood domains), and mRS score ≤ 2 (social roles domain). The effect of age may be explained by the better physical condition and greater autonomy of the younger patients, making it more difficult to return to the perception of the pre-stroke state. The type of revascularization therapy had no significant effect on the QoL scores, but patients treated with MT (either alone or as bridging therapy) had significantly greater improvement in Mobility score between 6 and 12 months than patients treated with IVT alone. This result could indicate a long-term beneficial effect of such a therapy on motor function. Most studies focused on the early functional outcome (at three months or six months) of patients treated with MT [,,,,], and our findings may indicate an additional long-term benefit of MT over IVT alone. One explanation could be the fact that stroke patients eligible to MT have more severe stroke, with more frequently motor impairment, which recovery may take several months.
The results of this study provide insight into the interpretation of quality of life data in future randomized clinical trials in patients treated with revascularization. First, despite the demonstrated efficacy of revascularization on vital and functional prognosis, the change in quality of life scores between 6 and 12 months after adjustment for relevant covariates is too small to reach significance, let alone clinical relevance, in most domains studied. The expected benefit in terms of quality of life of revascularization is therefore probably moderate. On the other hand, our study showed variables with a significant effect on quality of life and its evolution between 6 and 12 months, such as age, level of education, PAD, OSA, or mRS score before stroke. Although some associations are difficult to interpret, these variables would need to be balanced between the randomization groups to allow a correct interpretation of the results in terms of quality of life.
Our study had some limitations. First, our study population may not be a representative sample of all stroke survivors. Indeed, 27.5% of the stroke survivors included in the PARADISE study were not able to complete the SS-QoL questionnaire. The subjects included in our analysis were mostly younger and less affected by the severity of the stroke. Unfortunately, this pitfall could not be avoided since the most severe patients were not able to complete the questionnaire. There is no stroke-specific quality of life scale suitable for patients with the most severe forms of aphasia or severe dementia. We sought to minimize this selection bias by administering the questionnaire by telephone to patients who were unable to attend follow-up visits. Specific information about rehabilitation process was not collected. Although all patients were managed according to standard care, including rehabilitation when indicated, we cannot exclude that differences in rehabilitation programs may have influenced patients’ recovery and QoL.
5. Conclusions
Quality of life evolution over one year after ischemic stroke treated by revascularization had only slight variation, thus questioning about its relevance as endpoint of future randomized clinical trials. Changes in self-care, autonomy, and mood were independently negatively affected by age younger than 75 years, and stroke severity was associated with negative changes in mood and self-care. MT (either alone or as bridging therapy) may be associated with a greater improvement in perceived mobility between 6 and 12.
Author Contributions
Conceptualization, Y.B. and H.D.; methodology, A.M.D.R., H.D. and Y.B.; validation, H.D. and Y.B.; formal analysis, A.M.D.R. and H.D.; investigation, Y.B.; resources, Y.B.; data curation, A.M.D.R., G.D., M.S., S.A., Q.T. and Y.B.; writing—original draft preparation, A.M.D.R., H.D. and Y.B.; writing—review and editing, H.D. and Y.B.; supervision, H.D. and Y.B.; project administration, Y.B.; funding acquisition, Y.B. All authors have read and agreed to the published version of the manuscript.
Funding
This research was supported by the University Hospital of Dijon.
Institutional Review Board Statement
The study was approved by a French ethic committee (CCP Est I, IRB number: 2015-A01664-45).
Informed Consent Statement
Patients received information about the study and gave their oral consent to participate according to the French legislation.
Data Availability Statement
The authors declare that all supporting data are available within the article.
Conflicts of Interest
Yannick Béjot reports personal fees from BMS, Pfizer, Medtronic, Amgen, Servier, Boehringer-Ingelheim, and NovoNordisk outside the submitted work. Hervé Devilliers reports personal fees from GSK and Janssens, outside the submitted work. Other authors: none.
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