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Clinical research

Hematological biomarkers for predicting carotid artery vasospasm during carotid stenting

Yusuf Can
1
,
Ibrahim Kocayigit
1

1.
Department of Cardiology, University of Sakarya, Sakarya, Turkey
Arch Med Sci Atheroscler Dis 2020; 5: e206–e211
Online publish date: 2020/07/27
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Introduction

Vasospasm is one of the main factors complicating diseases that are mainly related to small vessels [1]. However, the spontaneous vasospasm of larger vessels is rare [2] and generally related to direct physical irritation of the endothelium [3], such as mechanical manipulations during operations or catheter applications [1]. Despite the technological improvements in endovascular interventions regarding safety and efficacy, vasospasm is still a major complication during these procedures [4].

Current literature data about carotid artery vasospasm are generally based on case reports, which mostly involve extracranial internal carotid artery stenosis [5]. The main reason for suggesting vasospasm as the underlying mechanism in these cases is the transient and recurring nature of this disorder. In most cases, stenosis resolves completely. Differential diagnosis of carotid vasospasm includes reversible cerebral vasoconstriction syndrome, primary angiitis of the central nervous system, arterial dissection, fibromuscular dysplasia and atherosclerosis, all of which cause stenosis in young patients without risk factors for stroke [6].

For decades, much effort has been exerted to determine the biochemical components of vasospasm, especially in stroke cases [7]. Previous studies have demonstrated that cellular adhesion molecules [8, 9], interleukin (IL)-6 [10], C3 and C4 complements [11], breakdown products of red blood cells and hemoglobin [12] are significantly related to vasospasm.

The aim of the current study is to evaluate the differences in the hematological parameters of patients with and without carotid artery vasospasm during carotid stenting.

Material and methods

A total of 120 patients were included in this study. The patients underwent carotid stenting between September 2010 and January 2015. Carotid artery vasospasm was angiographically defined as transient or persistent emergent stenosis or irregularity of the vessel wall without evidence of thrombosis during carotid stenting. Hematological parameters were compared between 21 (17.5%) patients who developed carotid artery vasospasm and 99 (82.5%) patients who did not. The complete blood count and serum biochemistry levels measured at the time of admission of the patients were obtained from the hospital records. The evaluated parameters were neutrophil–lymphocyte ratio, mean platelet volume, red cell distribution width, platelet distribution width, leucocyte count and monocyte count.

Patients with malignancies, chronic renal failure, chronic liver disease, hemoglobin values lower than 11 g/dl, white blood cell count higher than 11,000 cells/mm3, having complications other than carotid artery vasospasm and using proximal protection device were excluded from the study.

The study was approved by the Sakarya University Faculty of Medicine Ethics Committee (Ethics Committee Number 71522473/050.01.04/137 and approval date: 25.03.2020).

Statistical analysis

Statistical analyses were performed using SPSS Statistics software version 17.0 for Windows (SPSS Inc., Chicago, IL, USA). The Kolmogorov-Smirnov test was used to test the normality of data distribution. Descriptive statistics were presented as frequency and percent for categorical variables, and mean, standard deviation, median, minimum and maximum for numerical variables. Categorical data were compared between independent groups by the χ2 test, and numerical data were compared by either Student’s t test or the Mann-Whitney U test, according to meeting the normal distribution criteria. To determine independent predictors of carotid artery vasospasm, multiple logistic regression analysis was performed by including the parameters which were significantly different between the patients with and without carotid artery vasospasm. Odds ratio (OR), 95% confidence interval (CI) values and their significance from multiple logistic regression analysis were reported.

Results

The study participants included 36 (30%) females and 84 (70%) males. There were 21 (17.5%) patients who developed carotid artery vasospasm and 99 (82.5%) patients who did not. The patients with carotid artery vasospasm and without carotid artery vasospasm were 48 to 87 (66 ±8) and 48 to 90 (70 ±8) years old, respectively. The age (p = 0.063) and gender (p = 0.714) distributions of the patients with and without carotid artery vasospasm were not statistically significant (Table I).

Table I

Comparison of demographic characteristics between patients with carotid artery vasospasm and without carotid artery vasospasm

ParameterWith vasospasm Mean ± SDWithout vasospasm Mean ± SDP-value
Age [years]66 ±870 ±80.063
Gender:0.714
 Female7 (33.3)29 (29.3)
 Male14 (66.7)70 (70.7)
Hypertension19 (90.5)80 (80.8)0.362
Diabetes12 (57.1)30 (30.3)0.019
Coronary artery disease7 (33.3)30 (30.3)0.785
Smoking5 (23.8)21 (21.2)0.793
Cerebrovascular accident21 (100)98 (99)1
Peripheral artery disease3 (14.3)5 (5.1)0.144
Hyperlipidemia9 (42.9)32 (32.3)0.355
Carotid artery:0.216
 Right6 (28.6)42 (42.4)
 Left5 (23.8)29 (29.3)
 Both10 (47.6)28 (28.3)
Procedure:0.156
 Right12 (57.1)55 (55.6)
 Left7 (33.3)42 (42.4)
 Both2 (9.5)2 (2)
Dilatation:0.328
 Predilatation2 (9.5)20 (20.2)
 Postdilatation14 (66.7)61 (61.6)
 Both3 (14.3)5 (5.1)

[i] Continuous variables are presented as mean±SD, whereas categorical variables are presented as frequency (percentage).

The presence of comorbidities in patients with and without carotid artery vasospasm are shown in Table I. Accordingly, the distributions of hypertension, coronary artery disease, smoking, cerebrovascular accident, peripheral artery disease and hyperlipidemia were similar between the groups, but the presence of diabetes was significantly higher (p = 0.019) in patients with carotid artery vasospasm (57.1%) compared with patients without carotid artery vasospasm (30.3%).

The stenosis in the carotid arteries is also presented in Table I. The distribution of the lateralization of stenosis between the two groups was similar (p = 0.216), but patients with carotid artery vasospasm had a tendency to have stenosis in both carotid arteries and the patients without carotid artery vasospasm had more stenosis in the right carotid artery. When the groups were compared in terms of carotid stenting, both were found to have interventions in the right carotid artery (57.1% and 55.6%, respectively) and the distribution of the intervention side was similar in both groups (p = 0.156). Carotid artery spasm developed mainly after the dilatation procedure (66.7% in cases, 61.6% in controls), but the distribution in the groups was similar (p = 0.328).

The results of the hematological and biochemical tests are shown in Table II. The comparisons revealed that the leukocyte (p = 0.042) and neutrophil counts (p = 0.018) were significantly higher in patients with carotid artery vasospasm and the creatinine levels were significantly lower in patients without carotid artery vasospasm (p = 0.037). The remaining biochemical and hematological evaluations were similar between the patients with and without carotid artery vasospasm.

Table II

Comparison of hematological and biochemical parameters between patients with carotid artery vasospasm and without carotid artery vasospasm

ParameterWith vasospasm Mean ± SDWithout vasospasm Mean ± SDP-value
Hemoglobin [g/dl]13.4 ±1.313.1 ±1.30.281
Hematocrit (%)40.6 ±4.139.6 ±4.10.272
Leukocytes [× 103/µl]8.1 ±1.47.3 ±1.50.042
Platelets [× 103/µl]278.9 ±91.6240.5 ±58.80.097
MPV [fl]7.9 ±0.98 ±1.30.696
RDW (%)15.7 ±1.715.4 ±1.40.511
PDW [fl]17.8 ±0.918 ±1.10.289
Neutrophil [× 103/µl]5.0 ±1.14.4 ±1.30.018
Lymphocyte [× 103/µl]2.2 ±6.02.2 ±7.60.764
NLR2.4 ±0.92.2 ±0.90.179
Monocyte [× 103/µl]0.5 ±0.30.5 ±0.20.941
Total cholesterol [mg/dl]183 ±41.2190.9 ±42.70.614
Triglycerides [mg/dl]150.3 ±37.8162.5 ±71.80.759
LDL-C [mg/dl]116 ±35.5124.2 ±37.30.358
HDL-C [mg/dl]37.7 ±9.842.2 ±12.60.139
Uric acid [mg/dl]5.5 ±1.55.4 ±1.40.677
Urea [mg/dl]35.7 ±8.339.3 ±12.70.300
Creatinine [mg/dl]0.9 ±0.21 ±0.30.037

[i] Continuous variables are presented as mean ± SD. MPV – mean platelet volume, RDW – red cell distribution width, PDW – platelet distribution width, NLR – neutrophil-lymphocyte ratio, LDL-C – low-density lipoprotein cholesterol, HDL-C – high-density lipoprotein cholesterol.

To determine independent predictors of carotid artery vasospasm, multiple logistic regression analysis was performed by including the parameters which were significantly different between the patients with and without carotid artery vasospasm. The multiple logistic regression analyses revealed that creatinine levels within 0.5–0.9 (OR = 3.704, 95% CI: 1.245–11.019, p = 0.019), each 1000 unit increase in neutrophil count (OR = 1.567, 95% CI: 1.027–2.392, p = 0.037), and presence of diabetes (OR = 3.081, 95% CI: 1.116–8.505, p = 0.030) were independent predictors of carotid artery vasospasm. The results of the multiple logistic regression analysis are shown in Table III.

Table III

Independent predictors of carotid artery vasospasm in logistic regression model

ParameterP-valueOR95 CI for OR
Creatinine (0.5–0.9)0.0193.7041.24511.019
Neutrophil count0.0371.5671.0272.392
Presence of diabetes0.0303.0811.1168.505

[i] OR – odds ratio, CI – confidence interval.

Discussion

The primary aim of this study was to determine the independent predictors of carotid artery vasospasm development during carotid stenting in carotid artery. Creatinine levels between 0.5 and 0.9, each 1000 U increase in neutrophil count and presence of diabetes were found to be independent predictors of carotid artery vasospasm during carotid stenting.

The technological improvements in instruments and techniques for endovascular interventions have provided a significant safety and efficacy profile for these treatment options. Nevertheless, there are still some risks involved in these procedures. One of the most prominent complications is vasospasm. This phenomenon can be defined as the contraction of smooth muscle cells in the vessel walls. It may result in neurological deficits, particularly when occurring in the carotid arteries. To date, many studies have evaluated the mechanisms and treatment for vasospasm [1318]. Some substances, such as cocaine [19], L-thyroxine [20] and nonsteroidal anti-inflammatory drugs [21], as well as mechanical irritations [22], have been found to be associated with vasospasm. Notably, for medium and large arteries such as the carotids, the sheer size of the catheter is an important factor, as it may induce vasospasm [3]. Determining the risk of carotid artery vasospasm in patients who should undertake carotid stenting is important for preventing the neurological deficits that may develop following possible vasospasm and stenosis in the carotid arteries.

Currently available data about the relationship between vasospasm and hematological markers are mainly based on research involving the cardiovascular system. Coronary artery spasm has been reported to be an important factor in the pathogenesis of ischemic heart diseases, which cover variant, effort and unstable anginas, as well as acute myocardial infarction and sudden death [23]. Previous studies have reported that elevated serum C-reactive protein levels [24], hyperlipidemia [25], and monocyte and polymorphonuclear cell counts [26] are related to vasospasm in the coronary arteries. Moreover, the inflammatory process and biological markers related to inflammatory responses, such as intercellular adhesion molecule-1 and vascular cell adhesion molecule-1, are reportedly associated with coronary vasospasm [27, 28].

Studies that have evaluated the role of hematological parameters in carotid artery vasospasm were mainly conducted in patients with stroke because internal carotid artery stenosis is a predisposing condition in 5–12% of all strokes [29]. Another field of related research is subarachnoid hemorrhages because vasospasm is the most common complication of these hemorrhages, leading to clinical deterioration [7]. All of these studies showed that biomarkers related to inflammation are the main factors that contribute to vasospasm in the aforementioned disease groups. Leucocytosis and fever [30, 31], cellular adhesion molecules [8, 9], IL-6 [10], C3 and C4 complements [11], breakdown products of red blood cells and hemoglobin [12] have been reported to be associated with vasospasm in carotid stenosis. Similarly, our study found that creatinine level, neutrophil count and presence of diabetes are related to carotid artery vasospasm.

The prediction of carotid artery vasospasm in the carotid arteries, particularly before endovascular interventions, has clinical importance for the adoption of preventive measures, especially against neurovascular complications. Intra-arterial mechanical irritations caused by distal protection devices, which are used in endovascular processes, carry their own vasospasm risks due to endothelial irritation and injury [32]. If it is possible to predict the additional individual risk of carotid stenosis over this treatment risk, additional steps can be taken to prevent this complication. The treatment for this complication includes nitroglycerine, calcium-channel blockers and papaverine [3, 33], as well as retrieval of the filter device [34]. Nitroglycerine is the preferred treatment option in these conditions, but it also has the risk of worsening hypotension, which may eventually cause adverse cardiac events [35]. Therefore, it would be reasonable to predict carotid artery vasospasm for the adoption of preventive measures, such as using a second-generation mobile-basket filter device instead of a first-generation fixed-basket filter device during endovascular interventions [34]. The former has been shown to be safer for these procedures [36].

In conclusion, carotid artery vasospasm and decreased distal blood flow cause neurological complications that are generally, but not always, reversible. Although reversible, some neurological sequelae may still develop. The hematologic biomarkers that can predict carotid artery vasospasm are particularly important for adopting preventive measures against these neurovascular complications. In this context, we have found that creatinine levels within 0.5–0.9, each 1000 U increase in neutrophil count and presence of diabetes were independent predictors of vasospasm during carotid stenting. We believe this report will contribute to the data in the literature and our results should be confirmed by further larger-scale studies.

Conflict of interest

The authors declare no conflict of interest

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