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Eosinophil-to-Monocyte Ratio is a Potential Predictor of Prognosis in Acute Ischemic Stroke Patients After Intravenous Thrombolysis

Authors Chen Y, Ren J, Yang N, Huang H, Hu X, Sun F, Zeng T, Zhou X, Pan W, Hu J, Gao B, Zhang S, Chen G 

Received 7 March 2021

Accepted for publication 27 April 2021

Published 17 May 2021 Volume 2021:16 Pages 853—862


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Zhi-Ying Wu

Yueping Chen,1,* Junli Ren,2,3,* Naiping Yang,2,3,* Honghao Huang,2,3 Xueting Hu,2,3 Fangyue Sun,2,3 Tian Zeng,2,3 Xinbo Zhou,2,3 Wenjing Pan,2,3 Jingyu Hu,2,3 Beibei Gao,4 Shunkai Zhang,2 Guangyong Chen2

1Clinical Laboratory, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, People’s Republic of China; 2Department of Neurology, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, People’s Republic of China; 3School of the First Clinical Medical Sciences, Wenzhou Medical University, Wenzhou, People’s Republic of China; 4Department of Internal Medicine, The Third Affiliated Hospital of Wenzhou Medical University, Wenzhou, People’s Republic of China

*These authors contributed equally to this work.

Correspondence: Shunkai Zhang; Guangyong Chen
Department of Neurology, The Third Affiliated Hospital of Wenzhou Medical University, No. 108 Wansong Road, Wenzhou, 325000, Zhejiang, People’s Republic of China
Email [email protected]; [email protected]

Background: Eosinophil and monocyte have been demonstrated separately to be independent predictors of acute ischemic stroke (AIS). This study aimed to evaluate the association between eosinophil-to-monocyte ratio (EMR) and 3-month clinical outcome after treatment with recombinant tissue plasminogen activator (rt-PA) for AIS patients. Simultaneously, we made a simple comparison with other prognostic indicators, such as 24h neutrophil-to-lymphocyte ratio (NLR) and 24h platelet-to-lymphocyte ratio (PLR) to investigate the prognostic value of EMR.
Methods and Results: A total of 280 AIS patients receiving intravenous thrombolysis were retrospectively recruited for this study. Complete blood count evaluations for EMR were conducted on 24 hours admission. The poor outcome at 3-month was defined as the modified Rankin Scale (mRS) of 3– 6 and the mRS score for death was 6. The EMR levels in patients with AIS were lower than those in the healthy controls and showed a negative correlation with the NIHSS score. At the 3-month follow-up, multivariate logistic regression analysis indicated an association among EMR, poor outcome and mortality. In addition, EMR had a higher predictive ability than popular biomarkers like NLR and PLR for 3-month mortality.
Conclusion: The lower levels of EMR were independently associated with poor outcome and dead status in AIS patients.

Keywords: acute ischemic stroke, eosinophil-to-monocyte ratio, intravenous thrombolysis, treatment outcome, modified rankin scale


Acute ischemic stroke (AIS) possesses a high morbidity and mortality. And its pathophysiology, an inflammatory process involving endothelial activation, blood-brain barrier disruption, oxidant and inflammatory mediator accumulation, contributes to brain injury.1 Leukocytes, such as neutrophils, monocytes and lymphocytes, are vital inflammatory cells and play essential roles in atherosclerosis development and progression. Ratio indices, calculated by subtypes of white blood cells, such as neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR), can be easily performed in routine practice as well as have strong prognostic effects on clinical outcomes of AIS patients.2,3 Consequently, there is a growing trend for ratio indices to be used in predictions of thrombolytic outcome in AIS patients. Some reports indicated that eosinophils were inflammatory cells and were associated with severity of AIS.4 It has been reported that eosinophil-to-monocyte ratio (EMR) is a popular research topic for inflammatory hematologic scores and has an association with mortality in patients with ST-elevation myocardial infarction undergoing primary percutaneous coronary intervention.5,6 Both myocardial infarction and AIS are vascular obstructive diseases, which means EMR may possibly connect with the clinical outcome of AIS patients. However, the association between EMR and the outcome of AIS patients receiving thrombolysis has not been fully clarified. Therefore, the purpose of this article was to explore the relationship between EMR and 3-month clinical outcome after thrombolytic therapy with recombinant tissue plasminogen activator (rt-PA) for AIS patients.


Study Subjects

As shown in Figure 1, a total of 486 consecutive patients with a clinical diagnosis of AIS from 2016 to 2019 were retrospectively recruited, in which 76 received a bridging therapy consisting of rt-PA followed by endovascular therapy. They were excluded for the following exclusion criteria: (1) with rheumatic immune diseases; (2) with malignant tumor; (3) with acute myocardial infarction; (4) with the incomplete data [laboratory data such as eosinophil counts and monocyte counts, evaluation data such as modified Rankin Scale (mRS)]; (5) with severe liver damage; (6) with severe kidney damage; (7) with chronic inflammatory diseases. Finally, 280 cases were included in this analysis. Meanwhile, after propensity score matching, 130 cases were included as healthy controls (HCs).

Figure 1 Flow diagram showing the patient selection process.

Data Collection

Data of patients was collected through the illness record: demographics, medical history (hypertension, diabetes mellitus, hyperlipidemia and atrial fibrillation) and National Institutes of Health Stroke Scale (NIHSS) on admission. Additionally, 3-month mRS after the onset of AIS, collected by two trained physicians on phone interview, was used to evaluate the functional outcome. Moreover, the variables related to clinical outcomes such as Trial of Org 10,172 in Acute Stroke Treatment (TOAST), infarct volume, Alberta Stroke Program Early CT Score (ASPECT), symptomatic intracranial hemorrhage (sICH), door to needle time (DNT) and onset of needle time (ONT) were also collected. ASPECTS was rated on a scale from 10 (no early signs of ischemia) to 0 (early ischemic changes in all 10 regions). One point was subtracted from 10 for each of the defined regions.7 SICH was defined as evidence of hemorrhage on CT or MRI that seemed to be associated with an increase in NIHSS score of ≥ 4.8

Assessment of Eosinophil-to-Monocyte Ratio

The whole blood samples were collected on 24 hours admission and white blood cell counts and peripheral differential counts were measured. EMR was calculated using eosinophil counts divided by monocyte counts. According to the EMR on 24 hours admission, all patients were divided into tertiles.

Definitions of Outcome and Severity

With respect to NIHSS scores on admission, which could evaluate the severity of AIS, AIS patients were grouped as three levels: mild stroke (NIHSS scores: 0–5), moderate stroke (NIHSS scores: 6–10), severe stroke (NIHSS scores: > 10).9 In accordance with 3-month mRS score, all patients were grouped as two levels: good outcome group (mRS scores ≤ 2) and poor outcome group (mRS scores ≥ 3).10 In addition, AIS patients with a 3-month mRS score of 3–5 represented major disability while mRS = 6 represented death.

Statistical Analysis

Statistical analyses were performed via SPSS Statistics 24.0 software (SPSS Inc., Chicago, IL) and MedCalc Statistical Software version 15.2.2 (MedCalc Software bvba, Ostend, Belgium;; 2015). The normality of distribution was evaluated by the Kolmogorov–Smirnov test. Continuous variables were expressed as the mean with standard deviation (mean ± SD) or medians and interquartile range (median, IQR) while categorical variables were described as counts and percentages. Independent sample t test, Mann–Whitney U-test, one-way analysis of variance (ANOVA) or Kruskal–Wallis test were used appropriately for the comparison of continuous data. For categorical variables, chi-square test was performed. The Fisher exact test was used if the expected frequency was equal to or less than 5. To compare whether there were differences in EMR between HCs and AIS patients, people were divided into AIS group and HCs group. The propensity score matching was used to match the age and sex between the two groups with a match tolerance set at 0.02. Baseline characteristics according to EMR tertiles and AIS outcomes were also displayed. The Spearman and Chi-square tests were used to analyze the correlation between EMR levels and the severity of AIS. In order to investigate the association between EMR and AIS outcomes, univariate logistic regression analysis was used. In the case where the univariable analysis achieved statistical significance (p < 0.05), multivariable test was performed in addition. The receiver operating curve (ROC) was applied to analyze the accuracy of the prognosis of 24h EMR, 24h NLR, and 24h PLR for the 3-month outcome of AIS patients receiving thrombolysis. The differences in discriminative ability were tested using the DeLong method.11 Statistical significance was set at p < 0.05.

The study was approved by the Ethics Committee of our hospital and was performed in accordance with the Declaration of Helsinki. All subjects had signed a written informed consent form.


Baseline Characteristics of the Study Subjects

The demographic characteristics and EMR levels of all enrolled subjects are shown in Table 1. After matching of age and sex, the EMR levels in the patients with AIS were lower than those in the HCs (0.16 [0.06–0.27] vs 0.27 [0.17–0.47]; p < 0.001).

Table 1 Demographic and Laboratory Characteristics of AIS Patients and Healthy Controls

According to EMR levels on 24 hours admission, patients were divided into tertiles as follows: T1 (n = 96): EMR < 0.09, T2 (n = 92): 0.09 ≤ EMR ≤ 0.21 and T3 (n = 92): EMR > 0.21. Among these three groups, there were no statistical differences in terms of age, sex, hypertension, diabetes, hyperlipidemia, DNT, ONT, sICH, uric acid (UA), urea, creatinine, triglyceride (TC), high-density lipoprotein-cholesterol (HDL-C) and apolipoprotein-A1 (Apo-A1). Besides, proportion of atrial fibrillation, infarct volume, ASPECT, TOAST subtype, white blood cell count (WBC), NLR, and PLR were declined (p = 0.022, p < 0.001, p < 0.001, p = 0.047, p < 0.001, p < 0.001, p < 0.001, respectively) (Table 2).

Table 2 Characteristics of AIS Patients According to EMR Tertiles

The baseline characteristics of the included patients according to the 3-month outcome are summarized in Table 3. Among all enrolled 280 patients with AIS, 86 (30.7%) patients had poor outcome, and 27 (9.6%) patients had died. Patients with poor outcome exhibited significantly higher age, atrial fibrillation, infarct volume, initial NIHSS scores, WBC, urea, NLR, PLR and significantly lower eosinophil count and EMR level compared to patients with good outcome. Besides, patients died within 3-month follow-up exhibited significantly higher age, atrial fibrillation, initial NIHSS scores, infarct volume, WBC, NLR, PLR and significantly lower eosinophil count, monocyte count, platelet count and EMR levels compared to survivals.

Table 3 Comparison of Clinical Characteristics Between Good and Poor Outcome (or Alive and Dead)

Association Between EMR Levels and the Severity of AIS

The severity of AIS patients was assessed by the NIHSS score on admission. According to the common definition, AIS patients were divided into mild stroke group (NIHSS scores: 0–5, n = 101), moderate stroke group (NIHSS scores: 6–10, n = 100) and severe stroke group (NIHSS scores: > 10, n =79). We found that the patients with lower EMR levels were more likely to have moderate or severe stroke (p < 0.001) and severe stroke (p < 0.001) (Figure 2A).

Figure 2 (A) Distribution of NIHSS on admission in the tertiles of increasing EMR levels. (B) Distribution of 3-month mRS scores in the tertiles of increasing EMR levels.

Association Between EMR Levels and the 3-Month Outcome

The distribution of mRS scores in the three EMR groups is shown in Figure 2B. Up to 53.1% of patients developed poor outcome and up to 26.0% of patients died in the low EMR levels group (T1: EMR < 0.09). Proportion of poor outcome and death was 20.6% and 1.0% in the moderate EMR levels group (T2: 0.09 ≤ EMR ≤ 0.21). Besides, the proportion of poor outcome and death was 17.3% and 1.0% in the high EMR group (T3: EMR > 0.21). Patients were more likely to have a worse outcome if they had lower EMR.

Univariate logistic regression analysis demonstrated that the age, atrial fibrillation, WBC, EMR (per 0.01-point increase in EMR) were associated with poor outcome and dead status (Table 4). In model 1, compared to the subjects in T1, the odds ratio (OR) of subjects in T3 was 0.186 (95% CI 0.095–0.364, p < 0.001) for poor outcome and 0.031 (95% CI 0.004–0.236, p = 0.001) for death. After adjusting for age (Model 2), the odds ratio (OR) of the subjects in T3 was 0.153 (95% CI 0.074–0.314, p < 0.001) for poor outcome and 0.027 (95% CI 0.003–0.206, p = 0.001) for death when compared to the subjects in T1. Even after adjusting for all confounders shown in the univariate logistic regression (Model 3), the relationship between EMR and stroke outcome still remained significant in T3 with OR of 0.270 (95% CI: 0.124–0.589, p = 0.001) for poor outcome and 0.036 (95% CI: 0.004–0.292, p = 0.002) for death (Table 5). In addition, the OR values of T2 and T3 were close so that the relationship between EMR, poor outcome and mortality has appeared to be L-shaped. The result suggested that the lower levels of EMR were independently associated with poor outcome and mortality rate in AIS patients.

Table 4 Univariate Logistic Regression Analyses for Prognosis

Table 5 Adjusted Models for Prognosis at 3 Months

Receiver Operating Characteristic (ROC) Curve Analysis for 3-Month Outcome

ROC curves were performed to differentiate the efficiency of EMR and other popular biomarkers like NLR and PLR in predicting 3-month poor outcome (Figure 3A) and mortality (Figure 3B). There was no significant difference in efficiency between EMR and NLR for predicting poor outcome (AUC 0.730 vs 0.739; p = 0.790). Besides, EMR had a higher accuracy rate in predicting poor outcome than the level of PLR (AUC 0.730 vs 0.595; p = 0.001). The optimal cut-off value of the EMR that best discriminated poor outcome was 0.05 (55.8% sensitivity and 89.2% specificity). As for predicting mortality, EMR had a higher accuracy rate than NLR (AUC 0.877 vs 0.810; p = 0.024) and PLR (AUC 0.877 vs 0.619; p < 0.001). What is more, the optimal cut-off values of the EMR that best discriminated mortality were 0.05 (88.9% sensitivity and 82.2% specificity). Moreover, when we combined EMR and NLR, we found that there was also no significant difference in efficiency between them and single EMR in the aspect of predicting poor outcome or mortality (AUC 0.752 vs 0.730, p = 0.340; 0.882 vs 0.877, p = 0.615) (Table 6).

Table 6 Diagnostic Values of the EMR, NLR, PLR and NLR + EMR for Stroke Outcome

Figure 3 (A) Receiver operating characteristic curve (ROC) of EMR, NLR, PLR and NLR + EMR on the prognosis of AIS patients between poor outcome and good outcome. (B) Receiver operating characteristic curve (ROC) of EMR, NLR, PLR and NLR + EMR on the prognosis of AIS patients between death and survive.


In this retrospective interventional cohort study, it has been demonstrated that lower EMR level was an independent predictor of 3-month poor outcome for AIS patients receiving thrombolysis. To our knowledge, this is the first study to expound that EMR was related to clinical outcome and death status. The main findings of our study were as follows: (1) Lower EMR level was significantly associated with 3-month poor outcome and death status in AIS patients. (2) ROC curve analysis showed that EMR had a higher accuracy in predicting poor outcome than the level of PLR and a similar predictive ability compared to NLR. As for predicting mortality, EMR had a higher accuracy than NLR and PLR. (3) After adjustments, the predictive value of EMR was still significant.

Previous studies have shown that lower EMR levels are significantly related to the poor prognosis after treatment with rt-PA for AIS patients.12 Meanwhile, other researches have suggested that AIS patients with lower EMR levels are more likely to have limb dysfunction and difficult to recover.13 AIS is mainly caused by atherosclerosis of the large arteries. The accumulation and infiltration of eosinophils around the cerebral blood vessel walls could cause a series of inflammation and vascular injury reactions as well as aggravate the formation of unstable atherosclerosis of the arteries, which can easily lead to AIS. In addition, some studies indicated that monocytes were associated with the outcome of AIS patients with the following reasons.14,15 First, cerebral ischemia and hypoxia would stimulate monocytes to produce inflammatory mediators, such as interleukin-1 (IL-1), IL-6, IL-8 and tumor necrosis factor (TNF). Inflammation further aggravated cerebral ischemia and hypoxia, making brain tissue damage more serious.16 Second, monocytes could activate platelets to form platelet-monocyte aggregates (PMAs), which promote the release of inflammatory response factors, adhesion factors and vasoactive substances. PMAs could also accelerate thrombosis and vascular occlusion, causing the change in hemodynamics and aggravating cerebral ischemia damage.17,18

New indexes, calculated by subtypes of white blood cells, are better than single inflammatory cells in reflecting the systemic inflammation. EMR is a new parameter but the association between EMR and outcome of AIS patients has not been fully clarified. Our study demonstrated that lower EMR levels were related to poor outcome and mortality in AIS patients. We found that the lower EMR levels resulted from the decrease in eosinophil counts while the monocyte counts had no statistical differences among the three groups. In contrast to our current findings, other researchers found that monocyte counts were statistically significant in AIS.14 The reason for this discrepancy might be that the sample size they studied was small and the subjects were recruited from different regions. Here, we propose several hypotheses to investigate the causes of eosinophil penia in AIS patients. First, eosinophil apoptosis and degranulation are induced by inflammatory cytokines, resulting in excessive loss of eosinophil.19 Patients with larger infarct size may be prone to acute stress responses that stimulate the release of adrenal glucocorticoids and epinephrine, leading to a decrease in eosinophils.20,21 Secondly, the release of inflammatory cytokines after cerebral ischemia causes eosinophils to migrate to the inflammatory site, resulting in peripheral blood eosinophil reduction.22

Since a single inflammatory cell count has disadvantages in summarizing the overall systemic inflammation, it is a current research hotspot to propose novel indicators through combining different subtypes of white blood cells, like NLR and PLR. Above all, EMR is a potential prognostic marker with its convenience of calculating as eosinophils and monocytes were collected in the blood routine test.

Inevitably, our study has some limitations. First of all, the sample size of our study is relatively diminutive. Furthermore, because the patients participating in this study were from the same hospital, the results we got had certain limitations. Lastly, the mechanism connecting the prognostic effect of EMR on AIS patients and the interactions between eosinophils and monocytes were not fully understood. Therefore, more experimental studies are needed to explain this mechanism. However, our study may provide vital clues to the clinic.


The lower levels of EMR were independently associated with poor outcome and dead status for AIS patients.

Data Sharing Statement

The data that support the findings of this study are available from the corresponding author on reasonable request.

Ethics Approval and Consent to Participate

The study was approved by the Ethics Committee of the Third Affiliated Hospital of Wenzhou Medical University and was performed in accordance with the Declaration of Helsinki. All subjects signed a written informed consent form.

Consent for Publication

Not applicable.


We sincerely thank the participating hospitals, AIS patients, their families and colleagues who have provided valuable suggestions for this study. Yueping Chen, Junli Ren, and Naiping Yang are co-first authors of this study.

Author Contributions

Conceptualization and design, SZ and GC; Methodology, SZ, GC, YC and JR; Software, JR and NY; Validation, JR and NY; Formal Analysis, JR, NY, HH and XH; Investigation, SZ and GC; Resources, SZ and GC; Data Curation, YC, JR, NY, HH, XH, FS, TZ, XZ, WP, JH and BG; Writing-Original Draft Preparation, YC, JR, NY; Writing-Review & Editing, SZ, GC, YC, JR, NY, HH, XH, FS, TZ, XZ, WP, JH and BG; Visualization, YC, JR, and NY; Supervision, SZ and GC; Project Administration, SZ and GC. All authors contributed to data analysis, drafting or revising the article, have agreed on the journal to which the article will be submitted, gave final approval for the version to be published, and agreed to be accountable for all aspects of the work.


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


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