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Artykuł oryginalny

Udar niedokrwienny mózgu u kobiet i mężczyzn – rokowanie wewnątrzszpitalne

Justyna Tracz
1
,
Iwona Gorczyca-Głowacka
2, 3
,
Marcin Wełnicki
4
,
Ewa Kołodziejska
5
,
Anita Rosołowska
1
,
Artur Mamcarz
4
,
Beata Wożakowska-Kapłon
2, 3

1.
Clinic of Neurology, Swietokrzyskie Neurology Centre, Kielce, Poland
2.
1st Clinic of Cardiology and Electrotherapy, Swietokrzyskie Cardiology Centre, Kielce, Poland
3.
Collegium Medicum, University of Jan Kochanowski, Kielce, Poland
4.
3rd Department of Internal Diseases and Cardiology, Warsaw Medical University, Warsaw, Poland
5.
Department of Internal Diseases and Diabetology, Hospital St. Alexander, Kielce, Poland
Medical Studies/Studia Medyczne 2022; 38 (1): 22–30
Data publikacji online: 2022/03/31
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Introduction

Stroke is one of the most common causes of death in the adult population worldwide and the leading cause of disability in people aged over 45 years. It is estimated that approximately 5.5 million people die from stroke each year (accounting for ~10% of total deaths), and approximately half of the patients remain disabled [1–4]. The lifetime risk for stroke over the age of 25 years is approximately 25% among both men and women, with an 18% risk of ischaemic stroke. Increased incidence is observed in low and middle socio-demographic index countries [4]. The incidence of stroke in Poland is 175/100,000 in men and 125/100,000 in women. In the general population, men are affected more often than women [2, 3]. The risk of stroke increases with age in both men and women; however, in the elderly, a higher incidence of stroke is observed in women [2, 5, 6]. Sex also affects the clinical course of stroke and long-term prognosis, and higher percentages of mortality and disability are observed in women [1, 2, 5]. This phenomenon may be caused by the longer life span of women and more frequent incidence of stroke in old age, as well as by comorbidities predisposing to stroke, such as arterial hypertension, heart failure, atrial fibrillation (AF), and diabetes [2, 7].

Aim of research

The risk of stroke increases with age in both men and women, but women have a higher rate of mortality and disability following stroke. However, little is known about sex differences in stroke care and outcomes. The aim of the study was to compare the in-hospital mortality in men and women with ischaemic stroke and to identify factors that predispose to death.

Material and methods

Study group

This retrospective study included patients with ischaemic stroke who were subsequently hospitalized in the reference neurological centre in 2013–2014. Ischaemic stroke was diagnosed based on the clinical picture and head imaging (computed tomography or magnetic resonance imaging of the head).
The protocol of study was consistent with the Declaration of Helsinki and was approved by the Ethics Committee of Swiętokrzyska Medical Chamber. All patients consented to participate in the study.

Analysed data

Data on age, sex, comorbidities, results of additional tests, and the course of hospitalization were analysed.
The extent of the stroke was assessed using computed tomography or magnetic resonance imaging. Head imaging examinations were performed on admission to the hospital and again during hospitalization.
The patency of the intracerebral arteries was assessed with a Doppler ultrasound.
All patients underwent a resting 12-lead electrocardiographic examination on admission to the hospital and on discharge from the hospital. In some patients, 24-hour electrocardiography (ECG Holter) monitoring was performed. The patients were monitored 24/7 by electrocardiography during the first day after admission to the hospital.
The neurological status of patients was assessed using the National Institutes of Health Stroke Scale (NIHSS) immediately upon admission to the hospital. The neurological deterioration was defined as an increase of ≥ 5 points.
AF was diagnosed based on the definition of the European Society of Cardiology, according to which arrhythmia can be diagnosed based on an electrocardiogram showing irregular atrial rhythm lasting longer than 30 s.
Heart failure was diagnosed according to signs and symptoms of low cardiac output based on medical charts.
Diabetes mellitus was defined as a fasting blood glucose level greater than 126 mg/dl after a minimum of 2 tests or a glucose level greater than 200 mg/dl at any time during the day.
Hypertension was diagnosed when the blood pressure (BP) was ≥ 140/90 mm Hg in repeated tests.
Coronary heart disease was determined by a previous history of myocardial infarction and angina pectoris based on medical charts.

Study endpoint

The endpoint of the study was death during hospitalization.

Statistical analysis

The results were analysed with Statistica 13.0 software (StatSoft Inc.). The distribution of quantitative variables was assessed using the Shapiro-Wilk test. In terms of descriptive statistics, mean values, medians, minimum and maximum values, and standard deviations were presented for quantitative variables. For qualitative variables, the numbers and frequency of occurrence or modes were given, with their number and percentage share, depending on the type of data. Quantitative variables with a distribution similar to normal were compared with Student’s t-test for unrelated variables. The correlations between these variables were tested using the Pearson correlation coefficient. Quantitative unrelated variables with a non-normal distribution were compared with the Mann-Whitney U test, and the correlations between these variables were tested using the Spearman correlation coefficient. The statistical significance of the differences between qualitative variables was assessed using the c2 test. Appropriate logistic regression models were constructed for the conditional estimation of selected random variables. For statistically significant results from the univariate and multivariate regressions, the odds ratio (OR) is presented, together with a ±95% confidence interval (CI) and the p-value. Results were considered statistically significant if p < 0.05.

Results

Characteristics of the study group

The study group of 2000 patients included 1010 (50.5%) men. The mean age was 73.4 years. The most common comorbidity in the study group was hypertension, which was found in 1538 (76.9%) patients. AF occurred in 579 (29%) patients, diabetes mellitus in 520 (26%) patients, and ischaemic heart disease in 466 (23.3%) patients. Haemorrhagic complications of the stroke site were reported in 120 (6%) patients. The functional status of patients was assessed using the NIHSS scale in 1933 patients (971 men and 961 women). Significant neurological deficit (NIHSS ≥ 5 points) on admission to the hospital was found in 1107 (57.3%) patients, and 375 (18.8%) patients had severe disability (NIHSS ≥ 15 points) (Table 1).

Comparison of the clinical characteristics of women and men

Women were older than men on admission (mean age 77.3 vs. 69.5 years, respectively, p < 0.001). Figure 1 presents the proportion of women and men in particular age groups. In women, arterial hypertension, AF, and heart failure were more common than in men (82.2% vs. 71.7%, p < 0.001; 36.2% vs. 21.9%, p < 0.001; 18.4% vs. 11.6%, p < 0.001, respectively). In men, a history of myocardial infarction and chronic obstructive pulmonary disease (COPD) (13.1% vs. 9.9%, p = 0.044; 7.1% vs. 3.9%, p = 0.003, respectively) was more frequently reported. Men were more likely to abuse alcohol (8.1% vs. 7.2%, p = 0.476) and smoke (10.9% vs. 9.7%, p = 0.421). NIHSS scores ≥ 5 points were achieved by 537 (48.6%) men and 569 (51.4%) women (p = 0.340) (Table 1). In total, 170 (45.3%) men and 205 (54.7%) women had an NIHSS score ≥ 15 points, including 49 (15.5%) women and 98 (16.1%) men aged < 75 years, and 156 (24.2%) women and 72 (19.9%) men aged ≥ 74 years.

Study endpoint

During hospitalization, 318 (15.9%) patients – 141 (14%) men and 177 (17.9%) women – died (p = 0.02). Figure 2 shows the proportion of deaths in women and men in particular age groups.

Analysis of factors predisposing to death in women

The univariate analysis showed that the factors that increased the risk of death in women were as follows: age ≥ 75 years, arterial hypertension, COPD, glomerular filtration rate (GFR) < 60 ml/min/1.73 m2, and haemorrhagic transformation of the stroke site. The multivariate analysis showed that the risk of death in women was increased by age ≥ 75 years (OR = 2.507) and COPD (OR = 2.231). The strongest predictor of death in women was haemorrhagic transformation of the stroke site (OR = 4.77). Diabetes was a factor reducing the risk of death in women (OR = 0.613) (Table 2).

Analysis of the factors predisposing to death in men

The univariate analysis showed that the history of percutaneous coronary interventions, myocardial infarction, and GFR < 60 ml/min/1.73 m2 were factors increasing the risk of death in men. The multivariate analysis showed that the risk of death in men was increased by a history of myocardial infarction (OR = 2.295) and GFR < 60 ml/min/1.73 m2 (OR = 1.774). Hypertension was a factor reducing the risk of death in men (OR = 0.498) (Table 3).

Discussion

In this study on patients with ischaemic stroke, the percentages of women and men were similar, but the women were older on admission compared to the men. These results are consistent with reports by other authors, as well as with the phenomenon observed in the general population for years, indicating a longer life span for women [8–10]. The in-hospital mortality in this study was relatively high and was close to 16%. Data from other studies show diverse results, and in-hospital mortality in patients with ischaemic stroke is reported as 3.3–18% [7, 8, 11–14]. Considerable discrepancies in the results arise from different treatment methods for acute stroke and different clinical characteristics of the hospitalized patients.
Syta-Krzyżanowska et al. [15] showed that in a group of 971 patients hospitalized due to ischaemic stroke between 2002 and 2006, the in-hospital mortality was 16.4%. The patients were of a similar age to those in this study.
In this study, the mortality rate of women with ischaemic stroke was higher than that of men. Similar results were shown in the study by Reeves et al. [7] and in two Taiwanese studies [8, 14]. However, in the Italian, Canadian, and Swedish registers, no differences were found in the in-hospital mortality between women and men [9, 10, 16]. In these registers, women were slightly older than men. In our study, women were significantly older than men, which was important for the in-hospital prognosis. A higher mortality in the acute phase of ischaemic stroke is associated with the extent of the stroke and the severity of stroke, which has proven to be one of the most important predictors of early death in numerous studies [9, 11–14].
A NIHSS score of ≥ 5 points was recorded in a similar percentage of women and men. In the Canadian, Swedish, and Qatari registers, the severity of stroke was similar between women and men [9, 16, 17]. However, with higher NIHSS values (≥ 15 points), the percentage of women increased, which may be related to the older age of the women in this group and their greater disability before the disease occurred.
The incidence of stroke significantly increases with age, and advanced age is a factor of poor prognosis in ischaemic stroke [6]. In the present study, age was a factor that increased the risk of death in women. Similar results were presented in the study by Ong et al. [8]. Kortazar-Zubizarreta et al. [13] showed that age was an independent risk factor for death, but only in men. However, in another Taiwanese study, age increased the risk of death in both sexes [14].
Haemorrhagic transformation of the stroke site occurred with a similar frequency in women and men, but it was a predictor of in-hospital death only in women. This result is comparable with Ong et al. [8]. It is possible that the more frequent occurrence of arterial hypertension in women predisposes them to a worse prognosis after haemorrhagic transformation of the ischaemic site.
Another factor associated with a worse prognosis in women was COPD. Patients with chronic respiratory diseases have a worse prognosis after the occurrence of acute vascular events (heart attack, stroke) [18]. There are reports confirming that respiratory tract infection increases the risk of death in the early stage of ischaemic stroke [13]. In the present study, the effects of infection and of increased parameters of inflammation on the risk of death were not assessed. However, respiratory tract infections occur more frequently in patients with COPD than in the general population.
Men suffer from ischaemic heart disease more often [19]. In this study, men had stable coronary artery disease and a history of myocardial infarction and coronary revascularization more frequently than women. A history of myocardial infarction significantly increased the risk of death in men. The presence of vascular disease in multiple beds, in the coronary and cerebral vessels for the men in this study, significantly worsens the prognosis compared to patients with only one vascular bed affected [19].
Another significant predictor of death in men was impaired renal function (GFR < 60 ml/min/1.73 m2). Chronic kidney disease is a recognized risk factor for thromboembolic complications, including ischaemic stroke [20, 21]. In the meta-analysis by Lee et al. it was shown that most patients with GFR < 60 ml/min/1.73 m2 had a significantly increased risk of cardiovascular diseases, including stroke, and similarly the death rate in this group of patients was higher than in the population of patients with normal GFR [22].
Arterial hypertension is a significant risk factor for cardiovascular diseases, including stroke, in both sexes. A study by Howard et al. showed that normalization of blood pressure with pharmacological treatment reduces the risk of stroke, although the risk is still higher than in normotensives without pharmacological treatment [23, 24]. In the present study, in the univariate analysis in women, hypertension was a predictor of death, but this was not confirmed by the multivariate analysis. However, in men, arterial hypertension was a factor that reduced the risk of death. It may be related to the antihypertensive treatment used. This study is retrospective and no data on the pre-hospital treatment are available. There are reports proving the influence of gender on the response to antihypertensive treatment [25, 26]. On the other hand, the Blood Pressure Lowering Treatment Trialists’ Collaboration study showed that antihypertensive treatment was of equal benefit in both sexes [27]. This is inconsistent with the reports of Ong et al. and Akhtar et al., in which arterial hypertension was associated with worse outcomes in women with ischaemic stroke [8, 17]. Kortazar-Zubizarreta et al. [13] and Syta-Krzyżanowska et al. [15] showed no effect of arterial hypertension on the prognosis in the early stage of ischaemic stroke. Although diabetes is one of the factors predisposing to stroke in both sexes, in our study it was not a significant factor of worse prognosis in men. Interestingly, diabetes has been shown to reduce the risk of death during hospitalization in women. Reports in the literature assessing the impact of diabetes mellitus on the prognosis of patients with ischaemic stroke are not consistent. In a study by Heuschmann et al. [11], diabetes turned out to be a significant predictor of death only in men. Ong et al. [8] showed that the coexistence of diabetes worsened the prognosis in men and women, but a higher percentage of severe strokes was observed only in men.
In our study, AF did not increase the risk of in-hospital mortality. Patients with stroke and AF had additional risk factors associated with arrhythmia [28], and therefore AF was expected to increase in-hospital mortality in stroke patients.
Our result contrasts with what other studies have shown in both sexes [11, 12, 14] or only in women [8, 13]. Similarly to our study, the study by Andersen et al. also did not show that AF increased mortality in the acute phase of stroke (within 7 days). However, they did find such a correlation during a 30-day follow-up of patients after stroke [12]. Our study concerned patients staying in hospital for an average of 9 days from the onset of stroke. It is possible that AF would impact prognosis over a longer period. Another study [29] in the elderly population also did not show that AF was a significant predictor of mortality in people with stroke. The analysis by Marzona et al. [30] found no difference in mortality between men and women with AF, despite an increased risk of stroke in women, especially those over 65 years of age. However, there was a correlation between the risk of death from cardiovascular disease in women with AF and not receiving oral anticoagulant therapy. In the study by Senoo et al. [31], no significant differences were found in the frequency of strokes and mortality between women and men despite the use of anticoagulation. There were also no differences between age groups. The discrepancy in the results may be related to different inclusion criteria for patients in studies assessing the impact of AF on the occurrence of stroke and its consequences, such as comorbidities that, together with AF, worsen the prognosis of stroke, the assessment of patients in different age groups, and the use of anticoagulation therapy.
Our results show that men and women with ischaemic stroke have a different clinical profile and prognosis.
The main limitations of our study result from its retrospective nature. The lack of data on the treatment of patients before admission to the hospital, including data on anticoagulation, antihypertensive, and lipid-lowering treatment, makes it impossible to assess its impact on the prognosis of patients. Moreover, additional tests, such as echocardiography, 24-hour electrocardiographic monitoring, and lipid profile, were not performed in all patients. The impact of thrombolytic therapy on the prognosis of patients has not been evaluated. In the years covered by this analysis, people aged over 80 years, who constituted a significant part of the study group, were disqualified from thrombolytic treatment according to the adopted criteria.
However, our results indicate that there are factors that worsen stroke prognosis according to gender. Further observations on potential gender differences in risk factors for adverse prognosis in acute stroke are needed to reduce in-hospital deaths.

Conclusions

In this study in-hospital mortality in patients with ischaemic stroke was higher in women. In women, previous haemorrhagic stroke, age ≥ 75 years, and COPD increased the risk of in-hospital mortality. In men, a history of myocardial infarction and GFR < 60 ml/min/1.73 m2 increased the risk of in-hospital death.
Certain comorbidities may increase the risk of an adverse stroke course. Potential gender differences in risk factors for an unfavourable prognosis in acute stroke should be considered in order to reduce the number of hospital deaths.
Better knowledge of the predictors that increase the risk of an adverse stroke may open more avenues for preventive intervention and reduce serious post-stroke complications.

Acknowledgments

Language and formatting assistance was provided by Proper Medical Writing, Warsaw, Poland.

Conflict of interest

The authors declare no conflict of interest.

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