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Abstract

Objective

Intravenous thrombolytic therapy has become the standard of treatment for eligible patients with ischemic stroke. However, outcomes after receiving intravenous thrombolytic therapy vary widely. This study aims to investigate determinants of 1-year clinical outcomes of intravenous thrombolytic therapy for patients with acute ischemic stroke.

Methods

In a prospective, observational study, patients with acute ischemic stroke treated with intravenous thrombolysis were consecutively included, and clinical information and laboratory data were collected. The patients were followed up for 12 months after onset, and the 1-year clinical outcome was evaluated using modified Rankin Scale scores. A score ≥ 3 was defined as unfavorable functional outcome. Univariate and multivariate logistic regressions were used to assess the determinants of the 1-year clinical outcomes of intravenous thrombolysis for acute ischemic stroke.

Results

A total of 222 patients with intravenous thrombolysis were enrolled, and we identified 58 patients (26.1%) had unfavorable functional outcomes. Multivariate logistic regression analysis revealed that mean platelet volume-to-lymphocyte ratio (MPVLR) (odds ratio [OR] = 1.114, 95% confidence interval [CI]: 1.024–1.211, P = .012), atrial fibrillation (OR = 2.553, 95% CI: 1.086-6.002, P = .032), symptomatic stenosis occlusion (OR = 2.547, 95% CI: 1.269-5.110, P = .009), and baseline National Institutes of Health Stroke Scale (NIHSS) score (OR = 1.141, 95% CI: 1.074-1.212, P < .001) were independent predictors of unfavorable functional outcomes at 1 year.

Conclusions

In patients receiving intravenous thrombolysis, we found that MPVLR, atrial fibrillation, symptomatic stenosis occlusion, and baseline NIHSS score were significant predictors of unfavorable functional outcomes at 1 year.

Keywords

ischemic stroke thrombolytic therapy outcome mean platelet volume-to-lymphocyte ratio atrial fibrillation

Introduction

Acute ischemic stroke is the most common clinical cerebrovascular disease, with an increasing number of new cases each year, characterized by high disability, recurrence, and mortality rates.^1,2 Although disability and mortality rates are decreasing with the advancement of medical technology and improvement in patients’ awareness of early consultation, most surviving patients have neurological deficits, which impose a considerable burden on patients and society.^3,4 Recombinant tissue plasminogen activator (rtPA) attaches to fibrin on the surface of the clot and activates fibrin-bound plasminogen. Plasmin is subsequently cleaved from the plasminogen affiliated with the fibrin. The plasmin breaks down the fibrin molecules, and the clot dissolves, and thus improving the symptoms and prognosis of patients with thrombolysis; therefore, it is recommended by several guidelines.^5,6 Currently, thrombolysis with alteplase within 4.5 h is the most effective pharmacological treatment for acute ischemic stroke.

However, clinical outcomes differed among patients, and a significant number of patients still have poor outcomes despite rtPA treatment due to individual factors and treatment complications. Several observational studies have demonstrated that intravenous thrombolysis significantly reduces 3 to 6 month disability and several factors affecting clinical outcomes have been extensively explored. The results of reported studies on predicting outcomes in patients treated with rtPA show wide variability.^7–11 Recent studies on intravenous thrombolytic therapy with alteplase have mainly focused on the short-term outcome of patients, and few studies have investigated factors that influence the long-term outcomes of patients after intravenous thrombolysis. The prognosis of patients after intravenous thrombolytic therapy with rtPA is highly variable. Therefore, it is important to find prognostic predictors in patients with acute ischemic stroke treated with thrombolytic therapy. Blood cell variables have been reported to predict the risk and prognosis of ischemic stroke, particularly in patients receiving intravenous thrombolytic therapy.^12,13 Relevant reports show that mean platelet volume (MPV) is an indicator of platelet function, reflecting platelet size and activity. Increased MPV is associated with poor prognosis in patients with acute ischemic stroke and lower lymphocyte count reduction was independently associated with an increased probability of poor function.^14,15 Mean platelet volume-to-lymphocyte ratio (MPVLR) has been widely used as a composite index in prognostic studies of cardiovascular disease^16,17 and there are few studies on cerebrovascular disease.

Therefore, this study is the first to explore the factors, that affecting the 1-year outcomes of patients with acute ischemic stroke after intravenous thrombolysis. In addition, we evaluated the effect of MPVLR on the 1-year unfavorable outcomes of intravenous thrombolysis in acute ischemic stroke, in order to provide clues for a timely follow-up treatment strategy for patients with intravenous thrombolysis.

Methods

Subjects

This is a prospective, observational study conducted during September 2017 to February 2022. Patients with acute ischemic stroke who were hospitalized in the Department of Neurology of the Affiliated Fuyang People's Hospital of Anhui Medical University and received rtPA intravenous thrombolysis were consecutively included in this study. The inclusion criteria for patients were as follows: (1) patients aged ≥18 years who met the indications for intravenous thrombolysis for acute ischemic stroke and completed intravenous thrombolysis and (2) patients or family members who signed the informed consent. The exclusion criteria for the patients were as follows: (1) patients treated with intra-arterial thrombolysis or embolization; (2) patients with modified Rankin Scale (mRS) scores >2 before onset; (3) patients with severe hepatic and renal insufficiency and heart failure; and (4) patients with incomplete clinical or imaging data. This study was approved by the Research Ethics Committee of the Affiliated Fuyang People's Hospital of Anhui Medical University and was performed in accordance with the ethical standards established in the 1964 Declaration of Helsinki and its later amendments. All patients or their family members signed an informed consent form prior to inclusion.

Clinical Data

We collected demographic information, including sex, age, smoking history, history of previous stroke or transient ischemic attack (TIA), hypertension, diabetes mellitus, dyslipidemia, atrial fibrillation, coronary artery disease, etc. Hypertension was identified by prior use of antihypertensive medication, systolic blood pressure ≥ 140 mm Hg or diastolic blood pressure ≥ 90 mm Hg. Diabetes was determined by the prior use of antidiabetic drugs, fasting blood glucose ≥7.0 mmol/L, or 2h postprandial blood glucose ≥11.1 mmol/L. Hyperlipidemia was confirmed based on serum total cholesterol (≥5.2 mmol/L), triglycerides (≥1.7 mmol/L), low-density lipoprotein cholesterol (≥3.4 mmol/L), high-density lipoprotein (<1.0 mmol/L), or a previous diagnosis of dyslipidemia. Laboratory indicators were collected for all patients, such as neutrophil count, lymphocyte count, platelet count (PC), platelet distribution width, and MPV. MPVLR was calculated as the ratio of MPV to lymphocytes. Door-to-needle time was recorded in detail. Symptomatic stenosis occlusion was confirmed when magnetic resonance angiography (MRA) or computed tomography angiography (CTA) showed >50% stenosis or occlusion of the artery associated with an acute ischemic lesion, and symptomatic stenosis occlusion was defined according to Warfarin-Aspirin Symptomatic Intracranial Disease trial criteria.¹⁸ The subtype classification of stroke was based on the Trial of ORG 10172 in Acute Stroke Treatment.¹⁹ Subtypes of stroke were categorized by large-artery disease (LAD), small-artery disease (SAD), cardiac embolism (CE), or other determined and undetermined etiologies.

All patients underwent diffusion-weighted imaging and MRA or CTA within 48 h of admission. The type of lesion and the presence of arterial stenosis were studied. All imaging data were interpreted by experienced neurologists and neuroradiologists who were unaware of the clinical factors of the patients.

Evaluation of the Risk of Recurrent Stroke

The risk of stroke recurrence was assessed for each patient using the Essen Stroke Risk Score (ESRS).²⁰ The ESRS was calculated as a sum score (0-9 points): 2 points for age >75 years, 1 point each for age ≥65 to 75 years, arterial hypertension, diabetes mellitus, previous myocardial infarction, other cardiovascular diseases (except for myocardial infarction and atrial fibrillation), peripheral arterial disease, smoking, and previous TIA or ischemic stroke in addition to the qualifying event.

Stroke Severity and Clinical Outcome Assessment

The National Institutes of Health Stroke Scale (NIHSS) score was used to assess the severity of ischemic stroke at admission.²¹ The clinical outcomes of all enrolled patients were followed by a qualified trained neurologist by telephone or by appointment at an outpatient clinic. The follow up was terminated 12 months after acute cerebral infarction or when death occurred. Outcomes were evaluated using mRS, and mRS scores ≥3 were classified as a unfavorable outcome.²²

Statistical Analyses

Continuous data were assessed for normality using the Kolmogorov-Smirnov test. Continuous variables with a normal distribution are expressed as the mean ± standard deviation. Other variables that did not follow normal distributions are presented as the median (M) and interquartile range (IQR). Categorical variables are reported as absolute numbers and percentages. Differences in continuous variables between groups were assessed using Student's t test or the Mann-Whitney U test. Differences in categorical variable distributions between groups were assessed using the χ² test or Fisher's exact test, as appropriate. Spearman's correlation coefficient was used to determine the correlations of the MPVLR with mRS scores. More than 20 variables were included in the univariate model to estimate the factors affecting the 1-year clinical outcomes of patients. Variables with a potential association with unfavorable outcome (P < .1) from univariate analysis were used for multivariate analysis. After adjusting for age, dyslipidemia, and other conventional confounders, multivariate logistic regression was used to verify factors independently associated with the 1-year clinical outcomes. The results were analyzed for statistical significance using odds ratios (ORs) and 95% confidence intervals (CIs). All tests were 2-tailed, and P < 0.05 was considered to indicate statistical significance. Figures were generated using PowerPoint and GraphPad Prism software (version 8.0). All statistical analyses were performed using SPSS version 22.0 for Windows (SPSS Inc., Chicago, IL, USA).

Results

Clinical and Demographic Data

A total of 222 patients with intravenous thrombolysis for acute ischemic stroke were included in this study, including 147 (66.2%) males and 75 (33.8%) females. The median age was 64.5 years (IQR 54.0-71.0) years. In terms of etiological classification, 71 cases (32.0) had LAD, 29 cases (13.1%) had CE, 57 cases (25.7%) had SAD, and 65 cases (29.3%) had other causes and unknown causes. The ESRS was 2 (1-3) (median [IQR]), the baseline NIHSS score was 7 (4-12) (median [IQR]), and MPVLR was 6.43 (4.73-9.28) (median [IQR]). After 1 year of follow up, according to the mRS scores, 164 (73.9%) patients were in the favorable outcome group, and 58 (26.1%) were in the unfavorable outcome group, including 6 deaths, 2 patients died of sudden acute coronary syndrome, 1 died of multiple organ failure and 3 died of stroke (see Table 1).

Table 1.

The Clinical Characteristics of Patients With Acute Ischemic Stroke.

Number	222
Age (years)	64.5 (54.0-71.0)
Age grouped by median, n (%)
Age <65 years	111 (50.0)
Age ≥65 years	111 (50.0)
Male, n (%)	147 (66.2)
Vascular risk factors, n (%)
Hypertension	173 (77.9)
Diabetes	54 (24.3)
Dyslipidemia	95 (42.8)
Ischemic heart disease	34 (15.3)
Stroke history	49 (22.1)
Atrial fibrillation	33 (14.9)
Smoker	105 (47.3)
Alcohol user	93 (41.9)
NIHSS score, median (IQR)	7 (4-12)
ESRS, median (IQR)	2 (1-3)
Laboratory indicators
Neutrophil × 10⁹/L, median (IQR)	4.42 (3.51-5.88)
Lymphocyte × 10⁹/L, median (IQR)	1.56 (1.13-2.03)
PC ×10⁹/L, median (IQR)	202 ± 54
PDW (fL), median (IQR)	16.3 ± 0.4
MPV (fL), median (IQR)	10.1 ± 1.5
MPVLR, median (IQR)	6.43 (4.73-9.28)
DNT (min), median (IQR)	49.5 (38.0-66.0)
Symptomatic stenosis occlusion	98 (44.1)
Stroke etiology, n (%)
LAD	71 (32.0)
CE	29 (13.1)
SAD	57 (25.7)
Other and undetermined etiologies	65 (29.3)

Abbreviations: CE, cardiac embolism; DNT, door-to-needle time; ESRS, Essen Stroke Risk Score; IQR, interquartile range; LAD, large-artery disease; MPV, mean platelet volume; MPVLR, mean platelet volume-to-lymphocyte ratio; NIHSS, National Institutes of Health Stroke Scale; PC, platelet count; PDW, platelet distribution width; SAD, small-artery disease.

Comparison of Clinical Data Between the 1-Year Favorable and Unfavorable Outcome Groups After Intravenous Thrombolysis for Acute Ischemic Stroke

The clinical and demographic data for the 2 groups are shown in Table 2. Compared with the favorable outcome group, the unfavorable outcome group had significantly greater age (P = .047), atrial fibrillation (P < .001), baseline NIHSS scores (P < .001), symptomatic stenosis occlusion (P < .001), and MPV (P = .041), MPVLR (P = .009), and the differences were statistically significant. Dyslipidemia (P = .035) and lymphocyte (P = .036) were significantly greater in the favorable outcome group than in the unfavorable outcome group, with statistically significant differences. In terms of stroke etiology, the highest proportion of other and undetermined etiology and the lowest proportion of CE were found in the favorable outcome group, whereas the highest proportion of LAD and the lowest proportion of SAD were found in the unfavorable outcome group, so there was a significant difference in the distribution of stroke etiology between the 2 groups (P < .001), while the differences in other indicators were not statistically significant. Further analysis showed that mRS scores were significantly higher in patients with acute ischemic stroke with combined atrial fibrillation than in those without atrial fibrillation (P < .05; Figure 1).

Figure 1.

Distribution of mRS between acute ischemic stroke combined and noncombined atrial fibrillation. Abbreviation: mRS, modified Rankin Scale.

Table 2.

Comparison of Clinical Data Between Patients With Favorable and Unfavorable Outcomes at 1 Year After Intravenous Thrombolysis for Acute Ischemic Stroke.

Variable	Favorable outcome (n = 164)	Unfavorable outcome (n = 58)	t / Z or χ²	P value
Age (years)	63.5 (52.5-71.0)	68.0 (59.0-73.0)	−1.989	0.047
Age grouped by median, n (%)			2.334	0.127
Age <65 years	87 (53.0)	24 (41.4)
Age ≥65 years	77 (47.0)	34 (58.6)
Male, n (%)	109 (66.5)	38 (65.5)	0.017	0.896
Vascular risk factors, n (%)
Hypertension	127 (77.4)	46 (79.3)	0.087	0.768
Diabetes	38 (23.3)	16 (27.6)	0.454	0.501
Dyslipidemia	77 (47.0)	18 (31.0)	4.434	0.035
Ischemic heart disease	21 (12.8)	13 (22.4)	3.050	0.081
Stroke history	32 (19.5)	17 (29.3)	2.392	0.122
Atrial fibrillation	16 (9.8)	17 (29.3)	12.946	<0.001
Smoker	76 (46.3)	29 (50.0)	0.230	0.631
Alcohol user	69 (42.1)	24 (41.4)	0.008	0.927
NIHSS score, median (IQR)	6 (3-9)	12 (7-16)	−6.144	<0.001
ESRS, median (IQR)	2 (1-3)	3 (2-4)	−1.640	0.101
Laboratory indicators
Neutrophil × 10⁹/L, median (IQR)	4.38 (3.41-5.63)	5.15 (3.74-7.23)	−11.740	0.111
Lymphocyte × 10⁹/L, median (IQR)	1.65 (1.23-2.16)	1.39 (1.09-1.88)	−2.103	0.036
PC ×10⁹/L, median (IQR)	204.7 ± 54.7	195.0 ± 52.5	1.174	0.242
PDW(fL), median (IQR)	16.3 ± 0.4	16.2 ± 0.4	0.693	0.489
MPV (fL), median (IQR)	10.0 ± 1.4	10.5 ± 1.8	−2.057	0.041
MPVLR, median (IQR)	6.05 (4.56-8.39)	8.20 (4.91-11.63)	−2.581	0.009
DNT (min), median (IQR)	49.0 (38.5-65.0)	53.5 (38.0-76.0)	−0.585	0.556
Symptomatic stenosis occlusion	60 (36.6)	38 (65.5)	14.546	<0.001
Stroke etiology, n (%)			23.456	<0.001
LAD	44 (26.8)	27 (46.6)
CE	15 (9.2)	14 (24.1)
SAD	52 (31.7)	5 (8.6)
Other and undetermined etiologies	53 (32.3)	12 (20.7)

Associations of the MPVLR With mRS Scores and Rate of Unfavorable Outcome in Patients With Acute Ischemic Stroke

Spearman correlation analysis showed that the MPVLR was positively correlated with mRS scores (r = 0.194, P = .004). We divided the patients into tertile groups based on their MPVLRs on admission. In the first tertile (MPVLR ≤ 5.03) the unfavorable outcome rate was 27.6%; in the second tertile (5.03 < MPVLR ≤ 8.05) the unfavorable outcome rate was 22.4%; and in the third tertile (MPVLR > 8.05) the unfavorable outcome rate was 50.0% (Figure 2).

Figure 2.

Unfavorable outcome distribution of the tertile groups based on MPVLR. Abbreviation: MPVLR, mean platelet volume-to-lymphocyte ratio.

Independent Risk Factors for Unfavorable Outcomes at 1 Year After Intravenous Thrombolysis for Acute Ischemic Stroke

We used univariate and multivariate logistic regression models to analyze the associations between risk factors and unfavorable outcomes at 1 year after intravenous thrombolysis. The univariate logistic regression analysis indicated that the neutrophil, MPVLR, MPV, age, atrial fibrillation, NIHSS score, LAD, CE, and symptomatic stenosis occlusion were associated with unfavorable outcomes at 1 year. Multivariate logistic regression analysis indicated that MPVLR (OR = 1.114, 95% CI: 1.024-1.211), atrial fibrillation (OR = 2.553, 95% CI: 1.086-6.002), symptomatic stenosis occlusion (OR = 2.547, 95% CI: 1.269-5.110), and NIHSS (OR = 1.141, 95% CI: 1.074-1.212) were independent predictors of unfavorable outcomes at 1 year after intravenous thrombolysis (P < .05; see Table 3).

Table 3.

Univariate and Multivariate Logistic Regression Analysis of Outcome at 1 Year After Intravenous Thrombolysis.

	Univariate analysis		Multivariate analysis
	OR (95% CI)	P value	OR (95% CI)	P value
Age (years)	1.030 (1.003-1.058)	0.030
Age grouped by median
Age <65 years	Ref
Age ≥65 years	1.601 (0.873-2.934)	0.128
Sex	1.043 (0.555-1.961)	0.896
Vascular risk factors
Hypertension	1.117 (0.536-2.325)	0.768
Diabetes	1.263 (0.640-2.495)	0.501
Dyslipidemia	0.508 (0.269-0.960)	0.037
Ischemic heart disease	1.967 (0.912-4.242)	0.084
Stroke history	1.710 (0.862-3.392)	0.124
Atrial fibrillation	3.835 (1.784-8.245)	0.001	2.553 (1.086-6.002)	0.032
Smoker	1.158 (0.636-2.108)	0.632
Alcohol user	0.972 (0.529-1.784)	0.927
NIHSS score	1.168 (1.102-1.238)	<0.001	1.141 (1.074-1.212)	<0.001
ESRS	1.227 (0.972-1.548)	0.085
Neutrophil×10⁹/L	1.120 (1.009-1.244)	0.034
Lymphocyte ×10⁹/L	0.641 (0.412-0.996)	0.048
PC ×10⁹/L	0.997 (0.991-1.002)	0.242
PDW	0.776 (0.380-1.587)	0.488
MPV	1.217 (1.006-1.472)	0.043
MPVLR	1.118 (1.038-1.204)	0.003	1.114 (1.024-1.211)	0.012
DNT	1.003 (0.992-1.015)	0.557
Symptomatic stenosis occlusion	3.292 (1.758-6.170)	<0.001	2.547 (1.269-5.110)	0.009
Stroke etiology
LAD	6.382 (2.226-17.970)	<0.001
CE	9.013 (2.768-29.350)	<0.001
Other and undetermined etiologies	2.355 (0.775-7.154)	0.131
SAD	Ref

Abbreviations: 95% CI, 95% confidence interval; CE, cardiac embolism; DNT, door-to-needle time; ESRS, Essen Stroke Risk Score; MPV, mean platelet volume; MPVLR, mean platelet volume-to-lymphocyte ratio; NIHSS, National Institutes of Health Stroke Scale; OR, odds ratio; PC, platelet count; PDW, platelet distribution width; SAD, small-artery disease.

Discussion

In this study, 222 patients with acute ischemic stroke who received intravenous thrombolysis were followed up for 1 year. We found that MVPLR, atrial fibrillation, symptomatic stenosis occlusion, and a high baseline NIHSS score were significantly correlated with an unfavorable 1-year outcome of acute ischemic stroke.

The mechanism underlying the effect of the MPVLR on the outcome of acute ischemic stroke can be explained from the following perspectives. First, in acute ischemic stroke, many platelets are consumed to form thrombi. When platelets are continuously activated and aggregated during thrombosis, platelets in the blood circulation are depleted, which may lead to a decrease in the PC. Meanwhile, compensatory hyperplasia of bone marrow megakaryocytes occurs, resulting in the production of oversized platelets rich in granular components, which manifests as an increased MPV.²³ Second, the MPV is closely related to inflammatory cytokines, and inflammatory cytokines such as interleukin (IL)-6 and IL-3 can promote the production of oversized platelets by increasing the number of megakaryocytes. Therefore, the pre-acute ischemic stroke inflammatory state may also be a cause of high MPV levels.²⁴ Compared with normally sized platelets, oversized platelets are more prone to aggregation, more responsive to adenosine diphosphate activation, and less responsive to the inhibitory effect of prostacyclin, and patients with an elevated MPV are at a higher risk of thrombosis.²⁵ In addition, the inflammatory response after stroke plays an important role in ischemic brain tissue injury, and lymphocytes are a good reflection of the ability of the human immune system to respond to external damage. When acute cerebral infarction occurs, the induced systemic immunosuppression can lead to a significant decrease in the number of lymphocytes; since lymphocytes have anti-inflammatory functions and provide endothelial protection, this decrease increases susceptibility to infection and adversely affects clinical outcomes impact on clinical outcomes.^26,27 In the present study, lymphocytes were found to be significantly lower in patients in the unfavorable prognosis group than in the favorable prognosis group, which is consistent with these results.

MVPLR combined with the above pathophysiological characteristics of MPV and lymphocytes can provide more comprehensive information and better predict the outcome of related diseases. Previous studies have confirmed its correlation with various diseases such as acute coronary syndrome and diabetic nephropathy, indicating that MPVLR has a high clinical application.^16,17,28 A recent study reported that MPVLR elevation was associated with an unfavorable 3-month outcome of acute ischemic stroke.²⁹ Our study also showed that MPVLR were higher in the unfavorable outcome group of acute ischemic stroke and that the MPVLR was an independent predictor of a unfavorable 1-year clinical outcome for intravenous thrombolysis in acute ischemic stroke.

Atrial fibrillation is a common risk factor for acute ischemic stroke and is significantly associated with the severity of ischemic stroke, high incidence of complications, and poor prognosis.^30–33 Similar to previous studies, the results at 1 year after intravenous thrombolysis showed that the proportion of patients with combined atrial fibrillation was significantly higher in the poor outcome group than in the good outcome group (29.3% vs 9.8%), and further analysis showed that mRS scores were significantly higher in patients with acute ischemic stroke with combined atrial fibrillation than in those without atrial fibrillation, and that atrial fibrillation was a predictor of poor outcome at 1 year after intravenous thrombolysis in acute ischemic stroke. The results show that atrial fibrillation is a predictor of poor prognosis 1 year after intravenous thrombolysis in acute ischemic stroke. We speculate that the possible reasons for the poor outcome of thrombolysis in patients with ischemic stroke combined with atrial fibrillation are the large infarct size and high degree of disability.³⁴ A higher mRS score implies the occurrence of severe stroke, leading to a high rate of complications and poor outcome for the patient. Second, patients with atrial fibrillation form larger cardiogenic emboli that are not easily dissolved by thrombolytic drugs and obstruct early revascularization.³⁵ The results of this study suggest that, in addition to standardizing the treatment of patients with acute ischemic stroke with atrial fibrillation in the acute phase to effectively reduce the incidence of adverse outcome, primary prevention of stroke in patients with atrial fibrillation is more important for clinicians. The standardized assessment of stroke risk and bleeding risk in patients with atrial fibrillation, and the provision of relatively individualized and compliant anticoagulation strategies for patients with atrial fibrillation at high risk of stroke (eg, regular international standardized coagulation ratio monitoring or selection of new oral anticoagulants) are important.

The NIHSS score mainly reflects neurological impairment in patients with acute ischemic stroke and is an important indicator for assessing the severity of the disease. A higher NIHSS score indicates more severe neurological impairment, a larger infarct size, and more severe secondary brain injury. The NIHSS score has been widely used to assess the outcome of acute ischemic stroke. Studies have found that the NIHSS score at admission influences the 3-month outcome of acute ischemic stroke.^36,37 This study also demonstrated that a high NIHSS score was an independent risk factor for a unfavorable 1-year outcome of acute ischemic stroke. In addition, our study found that symptomatic stenosis occlusion was an independent risk factor for a unfavorable 1-year outcome of acute ischemic stroke, which is consistent with the findings of previous studies and is likely because patients with symptomatic stenosis occlusion have a greatly increased probability of ipsilateral cerebral infarction, and brain tissue in the blood supply area is more prone to hypoperfusion and subsequent irreversible cerebral infarction if vascular stenosis is significant or blood pressure fluctuates widely.^38,39

This study is the first to investigate predictors of the 1-year prognosis of patients with intravenous thrombolysis; however, this study also has some limitations. First, this study is a single-center observational study with a limited number of cases and geographic limitations, and some selection bias may exist; therefore, a multicenter study with a large sample is needed to further confirm the findings of this study. Second, this is an observational study in which some variables were excluded, such as the exclusion of COVID-19 patients and 12 months post-stroke due to missing data and missing outcomes at follow up. In addition, patients had very low mortality rates during a 1-year follow up after acute ischemic stroke may limit the findings to a low-risk population of acute ischemic stroke.

Conclusion

In this study, we found that MVPLR, atrial fibrillation, symptomatic stenosis occlusion, and a high baseline NIHSS score were significantly correlated with a unfavorable 1-year outcome of acute ischemic stroke.

Footnotes

Authors’ Contributions

MZ was involved in the design of the study, data collection, interpretation of the data, and manuscript writing and was a recipient of the obtained funding. HX and YL participated in the study design, data collection, and statistical analysis. JY and XC participated in the data analysis, interpretation of the data, and manuscript revision. YW is the guarantor. All authors read and approved the protocol.

Data Availability Statement

All data generated for this study are included in the article. The datasets generated during the current study are available from the corresponding author on reasonable request.

Declaration of Conflicting Interests

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Ethics Approval and Consent to Participate

The studies obtained ethical approval from the Institutional Review Board of the Affiliated Fuyang People's Hospital of Anhui Medical University ([2019] 67). The current study was carried out according to the Declaration of Helsinki. All participants were above 18 years of age and all of them or their legal proxies signed the written informed consent.

Funding

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This study was supported by the Fuyang Health and Health Commission Project (grant number FY2019-056) and the National Natural Science Foundation of China (grant number 82071460).

ORCID iD

Mingfeng Zhai

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Determinants of 1-Year Unfavorable Outcomes of Intravenous Alteplase Thrombolysis for Acute Ischemic Stroke

Abstract

Objective

Methods

Results

Conclusions

Keywords

Introduction

Methods

Subjects

Clinical Data

Evaluation of the Risk of Recurrent Stroke

Stroke Severity and Clinical Outcome Assessment

Statistical Analyses

Results

Clinical and Demographic Data

Comparison of Clinical Data Between the 1-Year Favorable and Unfavorable Outcome Groups After Intravenous Thrombolysis for Acute Ischemic Stroke

Associations of the MPVLR With mRS Scores and Rate of Unfavorable Outcome in Patients With Acute Ischemic Stroke

Independent Risk Factors for Unfavorable Outcomes at 1 Year After Intravenous Thrombolysis for Acute Ischemic Stroke

Discussion

Conclusion

Footnotes

Authors’ Contributions

Data Availability Statement

Declaration of Conflicting Interests

Ethics Approval and Consent to Participate

Funding

ORCID iD

References