Abstract
BACKGROUND
Intracerebral hemorrhage mainly occurs in middle-aged and elderly patients with hypertension, and surgery is currently the main treatment for hypertensive cerebral hemorrhage, but the bleeding caused by surgery will cause damage to the patient's nerve cells, resulting in cognitive and motor dysfunction, resulting in a decline in the patient's quality of life.
AIM
To investigate associations between cerebral arterial blood flow and executive and cognitive functions in depressed patients after acute hypertensive cerebral hemorrhage.
METHODS
Eighty-nine patients with depression after acute hypertensive cerebral hemorrhage who were admitted to our hospital between January 2019 and July 2021 were selected as the observation group, while 100 patients without depression who had acute hypertensive cerebral hemorrhage were selected as the control group. The attention span of the patients was assessed using the Paddle Pin Test while executive function was assessed using the Wisconsin Card Sorting Test (WCST) and cognitive function was assessed using the Montreal Cognitive Assessment Scale (MoCA). The Hamilton Depression Rating Scale (HAMD-24) was used to evaluate the severity of depression of involved patients. Cerebral arterial blood flow was measured in both groups.
RESULTS
The MoCA score, net scores I, II, III, IV, and the total net score of the scratch test in the observation group were significantly lower than those in the control group (P < 0.05). Concurrently, the total number of responses, number of incorrect responses, number of persistent errors, and number of completed responses of the first classification in the WCST test were significantly higher in the observation group than those in the control group (P < 0.05). Blood flow in the basilar artery, left middle cerebral artery, right middle cerebral artery, left anterior cerebral artery, and right anterior cerebral artery was significantly lower in the observation group than in the control group (P < 0.05). The basilar artery, left middle cerebral artery, right middle cerebral artery, left anterior cerebral artery, and right anterior cerebral artery were positively correlated with the net and total net scores of each part of the Paddle Pin test and the MoCA score (P < 0.05), and negatively correlated with each part of the WCST test (P < 0.05). In the observation group, the post-treatment improvement was more prominent in the Paddle Pin test, WCST test, HAMD-24 score, and MoCA score compared with those in the pre-treatment period (P < 0.05). Blood flow in the basilar artery, left middle cerebral artery, right middle cerebral artery, left anterior cerebral artery, and right anterior cerebral artery significantly improved in the observation group after treatment (P < 0.05).
CONCLUSION
Impaired attention, and executive and cognitive functions are correlated with cerebral artery blood flow in patients with depression after acute hypertensive cerebral hemorrhage and warrant further study.
Keywords: Acute hypertensive cerebral hemorrhage, Depression, Cerebral arterial blood flow, Attention, Executive ability, Cognitive function
Core Tip: Through a cohort of studies of visiting patients, we have concluded that impaired attention, executive and cognitive function in depressed patients after acute hypertensive intracerebral hemorrhage are associated with cerebral arterial blood flow, and these results require more research.
INTRODUCTION
In patients with hypertension, cerebral hemorrhage is induced by vascular retention due to long-term blood pressure and impaired blood circulation in the cerebral arteries of the body. Clinical data[1] show that cerebral hemorrhage mostly occurs in middle-aged and elderly patients with hypertension and has become a common complication in these patients. Surgery is the main treatment for hypertensive cerebral hemorrhage, but the hemorrhage caused by surgery can cause damage to the patient's nerve cells, leaving cognitive and motor dysfunction and reducing the patient's quality of life.
Foreign studies[2] have found that the velocity of cerebral blood flow slows and the vascular reactivity significantly reduces in patients with cognitive decline, while changes in velocity reflect the overall changes in cerebral blood flow indicating a direct relationship. A recent study[3] revealed significant cerebral blood flow hypoperfusion in brain regions such as the frontal lobe in patients with cognitive impairment and suggested that reduced local cerebral artery blood flow velocity and abnormal cerebral blood flow perfusion were associated. However, further studies are still needed. Therefore, the relationship between cerebral artery blood flow and executive and cognitive functions, such as attention, in depressed patients with acute hypertensive cerebral hemorrhage was investigated with an aim to provide data reference for the assessment of postoperative cognitive function and improvement of prognosis in clinical hypertensive cerebral hemorrhage.
MATERIALS AND METHODS
General characteristics
Eighty-nine patients with depression after acute hypertensive cerebral hemorrhage who were admitted in our hospital between January 2019 and July 2021 were selected as the observation group, while 100 patients without depression who had acute hypertensive cerebral hemorrhage were selected as the control group. Comparisons on clinical general information between the observation and control groups are shown in Table 1. The results are comparable to current studies. This study was approved by the hospital ethics committee.
Table 1.
General characteristics of the observation group and the control group, n (%)/ mean ± SD
|
Clinical Information
|
Observation group (n = 89)
|
Control group (n = 100)
|
t/χ2
|
P
|
| Gender | ||||
| Male | 54 (60.67) | 58 (58.00) | 0.139 | 0.709 |
| Female | 35 (39.33) | 42 (42.00) | ||
| Age (yr) | 55.79 ± 9.87 | 53.36 ± 10.15 | 1.664 | 0.098 |
| Body mass index (kg/m2) | 22.41 ± 2.36 | 22.18 ± 2.09 | 0.711 | 0.478 |
| Academic qualifications | ||||
| Below high school | 57 (64.04) | 70 (70.00) | 0.758 | 0.384 |
| High School and above | 32 (35.96) | 30 (30.00) | ||
| Brain hemorrhage lesions | ||||
| Basal joint | 39 (43.82) | 45 (45.00) | 0.716 | 0.949 |
| Thalamus | 23 (25.84) | 23 (23.00) | ||
| Lobe of the brain | 13 (14.61) | 17 (17.00) | ||
| Cerebellum | 9 (10.11) | 8 (8.00) | ||
| Brainstem | 5 (5.62) | 7 (7.00) | ||
| Amount of cerebral hemorrhage | ||||
| < 30 mL | 26 (29.21) | 30 (30.00) | 0.023 | 0.989 |
| 30-60 mL | 40 (44.94) | 45 (45.00) | ||
| > 60 mL | 23 (25.84) | 25 (25.00) | ||
| Cerebral hemorrhage side | ||||
| Right side | 29 (32.58) | 31 (31.00) | 0.055 | 0.815 |
| Left side | 60 (67.42) | 69 (69.00) | ||
| Surgical method | ||||
| Boneless flap | 55 (61.80) | 64 (64.00) | 0.098 | 0.754 |
| Small Bone Window | 34 (38.20) | 36 (36.00) |
Inclusion criteria: (1) Diagnosis of acute hypertensive cerebral hemorrhage that met the criteria in the Chinese Guidelines for the Diagnosis and Treatment of Cerebral Hemorrhage[4], and the diagnosis of depression met the criteria in the Diagnostic and Statistical Manual of Mental Progress IV with a score of ≥ 20 on the 24-item Hamilton Depression Inventory (HAMD-24); (2) debulking craniotomy or small bone window craniotomy for hematoma removal performed in our hospital; and (3) informed consent from the patient and family.
Exclusion criteria: (1) Preoperative history of mental illness; (2) other serious diseases such as malignant tumors and hematologic diseases; and (3) drug abuse, alcoholism, and other bad habits.
Inspection method
Cerebral artery blood flow examination: A transcranial color Doppler ultrasound diagnostic instrument (model TC7-NB, manufactured by Neusoft Xikang, with a probe frequency of 2 MHz) was used to perform the cerebral artery blood flow examination three months after patient surgery. Blood flow velocities of the left posterior cerebral artery and right posterior cerebral artery were measured via temporal and occipital windows.
Survey methods and tools
All patients were examined after three months postoperatively for recovery of relevant functions. (1) Scratch test[5] was used to assess patient attention. The test was divided into 5 parts (I to V), each part conducted in 3 min. The 5-part test was done in succession, according to the formula: Fine score = coarse score (number of scratch errors + 1/2 missed scratch). The net score for each part and the total score were calculated; the higher the net score, the better the patient's attention; (2) the Wisconsin Card Sorting Test (WCST)[6] was used to assess the executive function of the patients. Patients were instructed to sort the color, shape, and number of four cards that appeared on the screen at each time. A total of 128 cards was shown. The total number of responses, number of incorrect responses, number of persistent errors, and number of completed responses for the first round were calculated; (3) patients were evaluated for depression using the HAMD-24[7], a 7-factor scale that includes anxiety/somatization, weight change, cognitive impairment, day-night change, blockage, sleep disturbance, and feelings of hopelessness. Scores ≥ 20 confirmed depression and a higher score indicated greater severity of the depressive symptoms; and (4) the Montreal Cognitive Assessment Scale (MoCA)[8] was used to assess the cognitive function of the patients. The scale includes eight domains, namely, attention and concentration, executive function, memory, language, visual-structural skills, abstract thinking, computation, and orientation, with a total score of 30 and ≥ 26 being normal.
Statistical analyses
Statistical analysis was performed using SPSS (version 22.0), normally distributed measures were expressed as mean ± SD, and t test was used to analyze the differences between groups. Count data were expressed as n (%), and χ2 test was used to analyze the differences between groups. Correlations were analyzed using Pearson correlation. Significance was set at P = 0.05.
RESULTS
Comparison of patients' attention and executive ability
The MoCA score, net scores I, II, III, IV, and the total net score of the scratch test were significantly lower in the observation group than in the control group (P < 0.05). Concurrently, the total number of responses, number of incorrect responses, number of persistent errors, and number of completed responses of the first classification were significantly higher in the WCST test of the observation group than those in the control group (P < 0.05) (Table 2).
Table 2.
Comparison of attention, executive ability, and Montreal Cognitive Assessment Scale scores between the two groups, mean ± SD
|
Indicators
|
Observation group (n = 89)
|
Control group (n = 100)
|
t
|
P value
|
| Paddle pin quiz (points) | ||||
| Net score I | 32.20 ± 8.89 | 57.65 ± 9.90 | -18.504 | < 0.001 |
| Net score II | 36.60 ± 9.17 | 61.50 ± 9.24 | -18.558 | < 0.001 |
| Net score III | 17.20 ± 5.51 | 32.20 ± 5.58 | -18.556 | < 0.001 |
| Net score IV | 21.84 ± 8.05 | 28.80 ± 7.10 | -6.316 | < 0.001 |
| Net score V | 7.70 ± 2.40 | 15.50 ± 4.43 | -14.788 | < 0.001 |
| Total net score | 115.80 ± 12.26 | 195.76 ± 20.03 | -32.609 | < 0.001 |
| Wisconsin Card Sorting Test | ||||
| Total number of responses | 122.45 ± 14.48 | 92.52 ± 16.60 | 13.134 | < 0.001 |
| Number of error responses | 52.50 ± 13.37 | 19.54 ± 5.54 | 22.576 | < 0.001 |
| Number of persistent errors | 26.20 ± 8.89 | 8.90 ± 1.15 | 19.286 | < 0.001 |
| Number of completed answers for the 1st classification | 26.10 ± 6.86 | 15.70 ± 4.12 | 12.791 | < 0.001 |
| MoCA score (points) | 24.40 ± 2.21 | 27.80 ± 2.13 | -10.762 | < 0.001 |
MoCA: Montreal Cognitive Assessment Scale.
Comparison of cerebral artery blood flow
Blood flow in the basilar artery, left middle cerebral artery, right middle cerebral artery, left anterior cerebral artery, and right anterior cerebral artery was significantly lower in the observation group than in the control group (P < 0.05) (Figure 1; Table 3).
Figure 1.
Histogram of cerebral artery blood flow in two groups of patients. aP < 0.05, indicates statistically significant.
Table 3.
Comparison of cerebral artery blood flow between two groups of patients
|
Cerebral arteries
|
Observation group (n = 89)
|
Control group (n = 100)
|
t
|
P value
|
| Basilar artery (cm/s) | 37.20 ± 4.43 | 42.20 ± 3.95 | -8.203 | < 0.001 |
| Left vertebral artery (cm/s) | 37.15 ± 3.34 | 37.50 ± 3.15 | -0.741 | 0.460 |
| Right vertebral artery (cm/s) | 34.41 ± 4.03 | 35.54 ± 3.88 | -1.962 | 0.051 |
| Left middle cerebral artery (cm/s) | 57.65 ± 6.82 | 68.15 ± 7.15 | -10.298 | < 0.001 |
| Right middle cerebral artery (cm/s) | 57.80 ± 7.15 | 66.80 ± 8.20 | -7.996 | < 0.001 |
| Left anterior cerebral artery (cm/s) | 50.03 ± 6.68 | 61.15 ± 7.90 | -10.380 | < 0.001 |
| Right anterior cerebral artery (cm/s) | 47.80 ± 4.55 | 60.03 ± 6.22 | -15.266 | < 0.001 |
| Left posterior cerebral artery (cm/s) | 36.12 ± 8.03 | 37.09 ± 7.33 | -0.868 | 0.386 |
| Right posterior cerebral artery (cm/s) | 35.51 ± 6.11 | 36.12 ± 6.84 | -0.643 | 0.521 |
Correlation between cerebral arterial blood flow, attention, and executive ability
Cerebral artery blood flow was correlated with attention, executive ability, and MoCA scores in the observation group. The basilar artery, left middle cerebral artery, right middle cerebral artery, left anterior cerebral artery, and right anterior cerebral artery were positively correlated with the net and total net scores of each part of the Paddle Pin test and the MoCA score (P < 0.05), and negatively correlated with each part of the WCST test (P < 0.05) (Tables 4 and 5).
Table 4.
Correlation between cerebral artery blood flow and attention
| Cerebral arteries |
Paddle pin quiz (points)
|
|||||
|
Net score I
|
Net score II
|
Net score III
|
Net score IV
|
Net score V
|
Total net score
|
|
| Basilar artery (cm/s) | 0.322a | 0.335a | 0.104 | 0.142 | 0.402a | 0.422a |
| Left vertebral artery (cm/s) | 0.187 | 0.141 | 0.203 | 0.098 | 0.104 | 0.117 |
| Right vertebral artery (cm/s) | 0.105 | 0.112 | 0.114 | -0.058 | -0.087 | 0.184 |
| Left middle cerebral artery (cm/s) | 0.503a | 0.487a | 0.505a | 0.427a | 0.112 | 0.503a |
| Right middle cerebral artery (cm/s) | 0.488a | 0.502a | 0.412a | 0.403a | 0.109 | 0.477a |
| Left anterior cerebral artery (cm/s) | -0.098 | 0.415a | 0.309a | 0.378a | 0.415a | 0.432a |
| Right anterior cerebral artery (cm/s) | -0.102 | 0.433a | 0.318a | 0.390a | 0.470a | 0.387a |
| Left posterior cerebral artery (cm/s) | 0.234 | -0.054 | 0.087 | 0.099 | -0.107 | 0.108 |
| Right posterior cerebral artery (cm/s) | 0.105 | -0.101 | 0.112 | 0.100 | -0.087 | 0.102 |
P < 0.05, indicates statistically significant.
Table 5.
Correlation between cerebral artery blood flow and executive ability
| Cerebral arteries |
Wisconsin Card Sorting Test
|
MoCA score (points) | |||
|
Total number of responses
|
Number of error responses
|
Number of persistent errors
|
Number of completed answers for the 1st classification
|
||
| Basilar artery (cm/s) | -0.385a | -0.098 | -0.112 | -0.324a | 0.312a |
| Left vertebral artery (cm/s) | -0.065 | -0.106 | -0.082 | -0.114 | 0.018 |
| Right vertebral artery (cm/s) | -0.097 | -0.114 | -0.109 | -0.078 | 0.095 |
| Left middle cerebral artery (cm/s) | -0.398a | -0.423a | -0.115 | -0.447a | 0.387a |
| Right middle cerebral artery (cm/s) | -0.503a | -0.406a | -0.124 | -0.435a | 0.406a |
| Left anterior cerebral artery (cm/s) | -0.411a | -0.378a | -0.411a | -0.347a | 0.355a |
| Right anterior cerebral artery (cm/s) | -0.365a | -0.109 | -0.362a | -0.303a | 0.378a |
| Left posterior cerebral artery (cm/s) | 0.065 | -0.087 | -0.098 | 0.012 | 0.046 |
| Right posterior cerebral artery (cm/s) | -0.098 | 0.045 | -0.077 | 0.087 | 0.112 |
P < 0.05, indicates statistically significant.
MoCA: Montreal Cognitive Assessment Scale.
Comparison of attention and executive ability in the observation group before and after treatment
The Paddle Pin test, WCST test, HAMD-24 score, and MoCA score improved in the observation group after treatment from the pre-treatment period (P < 0.05) (Table 6).
Table 6.
Comparison of attention and executive ability in the observation group before and after treatment, mean ± SD
|
Indicators
|
Before treatment (n = 89)
|
After treatment (n = 89)
|
t
|
P value
|
| Paddle pin quiz (points) | ||||
| Net score I | 32.20 ± 8.89 | 40.54 ± 9.12 | 6.178 | < 0.001 |
| Net score II | 36.60 ± 9.17 | 42.21 ± 8.43 | 4.249 | < 0.001 |
| Net score III | 17.20 ± 5.51 | 22.25 ± 4.80 | 6.520 | < 0.001 |
| Net score IV | 21.84 ± 8.05 | 24.63 ± 7.12 | 2.449 | 0.015 |
| Net score V | 7.70 ± 2.40 | 9.12 ± 1.87 | 4.403 | < 0.001 |
| Total net score | 115.80 ± 12.26 | 135.58 ± 20.43 | 7.832 | < 0.001 |
| Wisconsin Card Sorting Test | ||||
| Total number of responses | 122.45 ± 14.48 | 75.50 ± 15.03 | 21.223 | < 0.001 |
| Number of error responses | 52.50 ± 13.37 | 38.65 ± 11.20 | 7.491 | < 0.001 |
| Number of persistent errors | 26.20 ± 8.89 | 22.40 ± 9.02 | 2.831 | 0.005 |
| Number of completed answers for the 1st classification | 26.10 ± 6.86 | 20.03 ± 5.74 | 6.402 | < 0.001 |
| HAMD-24 score (points) | 27.20 ± 2.03 | 21.02 ± 2.11 | 19.912 | < 0.001 |
| MoCA score (points) | 24.40 ± 2.21 | 26.12 ± 2.32 | 5.064 | < 0.001 |
HAMD: Hamilton Depression Rating Scale; MoCA: Montreal Cognitive Assessment Scale.
Comparison of cerebral artery blood flow in the observation group before and after treatment
Blood flow in the basilar artery, left middle cerebral artery, right middle cerebral artery, left anterior cerebral artery, and right anterior cerebral artery improved in the observation group after treatment compared with that before treatment (P < 0.05) (Table 7).
Table 7.
Comparison of cerebral artery blood flow in the observation group before and after treatment, mean ± SD
|
Cerebral arteries
|
Before treatment (n = 89)
|
3 months after treatment (n = 89)
|
t
|
P value
|
| Basilar artery (cm/s) | 37.20 ± 4.43 | 40.03 ± 4.10 | 4.423 | 0.000 |
| Left vertebral artery (cm/s) | 37.15 ± 3.34 | 37.25 ± 3.80 | 0.186 | 0.852 |
| Right vertebral artery (cm/s) | 34.41 ± 4.03 | 34.84 ± 3.95 | 0.719 | 0.473 |
| Left middle cerebral artery (cm/s) | 57.65 ± 6.82 | 62.28 ± 7.03 | 4.460 | 0.000 |
| Right middle cerebral artery (cm/s) | 57.80 ± 7.15 | 63.15 ± 6.87 | 5.090 | 0.000 |
| Left anterior cerebral artery (cm/s) | 50.03 ± 6.68 | 55.59 ± 6.92 | 5.454 | 0.000 |
| Right anterior cerebral artery (cm/s) | 47.80 ± 4.55 | 54.49 ± 5.03 | 9.305 | 0.000 |
| Left posterior cerebral artery (cm/s) | 36.12 ± 8.03 | 36.03 ± 7.78 | 0.076 | 0.940 |
| Right posterior cerebral artery (cm/s) | 35.51 ± 6.11 | 35.80 ± 5.22 | 0.340 | 0.734 |
DISCUSSION
Relevant data[9] showed that the incidence of hypertensive cerebral hemorrhage accounted for about 30% of acute cerebrovascular diseases in China and was a common critical cerebrovascular disease among the elderly. Cerebral parenchymal hemorrhage leading to cerebral hematoma, which in turn induces primary and secondary damage to the central nervous system, is the main pathological manifestation of this disease, while cognitive dysfunction and decreased attentional executive ability are both significant secondary damage outcomes[7,10]. The results of this study show that the MoCA score, net score I, II, III, n IV, and total net score of the scratch test in the observation group were significantly lower than those in the control group. Conversely, the number of total responses, incorrect responses, persistent errors, and number of completed first categorized responses on the WCST were significantly higher in the observation group than those in the control group. These results suggest that there is impairment of attention and executive power in depressed patients after acute hypertensive cerebral hemorrhage. This indicates that changes in attention and executive power of patients should be observed after hypertensive cerebral hemorrhage surgery and timely preventive and restorative treatment should be given to improve the quality of life of patients.
Color Doppler ultrasound can clearly show the vascular alignment, avoid important vessels, find the best surgical access, minimize damage to normal brain tissue, provide real-time intraoperative ultrasound which can accurately measure the size of intracranial hematoma, locate the intracranial hematoma, and gradually aid the removal of the hematoma under a microscope, helping to reduce brain tissue damage and better protect the cerebral vessels[11-13]. The comparison of cerebral artery blood flow between the two groups revealed that the blood flow in the basilar artery, left middle cerebral artery, right middle cerebral artery, left anterior cerebral artery, and right anterior cerebral artery in the observation group was significantly lower than that in the control group, which may be mainly due to the fact that patients with cognitive impairment mostly have damage in the frontal, parietal, temporal lobes and basal ganglia, and the cerebral hemodynamics in the internal carotid artery system is not perfused enough, which in turn leads to their cognitive impairment.
The present study continued to correlate cerebral artery blood flow with attention, executive ability, and MoCA scores in the observation group and found that the basilar artery, left middle cerebral artery, right middle cerebral artery, left anterior cerebral artery, and right anterior cerebral artery were positively correlated with the net and total net scores of each part of the Paddle Pin test and negatively correlated with each part of the WCST test. This suggests that there may be a relationship between cognitive impairment and slow cerebral artery blood flow velocity in depression, further confirming the relationship between cerebral artery blood flow velocity and cognitive function in depression. Longitudinal studies and analyses of cerebral artery hemodynamics and cognitive function-related indicators in depressed patients may be considered in the future to provide data references for the prevention and improvement of cognitive dysfunction in patients.
The WCST is a neuropsychological test commonly used to examine attention. Clinical practice has shown that WCST scores are closely related to frontal lobe function and can specifically reflect frontal lobe function[14-17]. The WCST is a commonly used neuropsychological test to examine attention. Furthermore, this study found that Paddle Pin test, WCST test, HAMD-24 score, and MoCA score improved in the observation group after treatment compared to the pre-treatment period. This result also further suggests that cerebral blood flow velocity is closely related to attention and executive function impairment, confirming the hypothesis that the relationship between cerebral blood flow velocity and partial cognitive impairment in depression, and that the regulation of disturbed cerebral arterial hemodynamics may contribute to the improvement of cognitive function, which deserves further investigation[18-20]. However, there are some limitations in this study, as only the changes in mean arterial blood flow velocity were analyzed but not in combination with cerebral perfusion imaging, which needs to be studied in more depth and detail in the future. Additionally, the sample size of this study was small and the observation time was not long enough; thus, it was not possible to study the factors that may affect cerebral blood flow velocity and cognitive function according to the different age of onset, duration, and refractory nature of depression.
CONCLUSION
The impaired attention, executive, cognitive functions in depressed patients after acute hypertensive cerebral hemorrhage are correlated with cerebral arterial blood flow in patients and are worthy of further study.
Footnotes
Institutional review board statement: This study has been approved by the institutional review board of Hengshui People's Hospital.
Informed consent statement: The informed consent has been obtained from every patient.
Conflict-of-interest statement: There is no conflict of interest.
STROBE statement: The authors have read the STROBE Statement-checklist of items, and the manuscript was prepared and revised according to the STROBE Statement- checklist of items.
Provenance and peer review: Unsolicited article; Externally peer reviewed.
Peer-review model: Single blind
Specialty type: Medicine, research and experimental
Country of origin: China
Peer-review report’s classification
Scientific Quality: Grade C
Novelty: Grade B
Creativity or Innovation: Grade B
Scientific Significance: Grade B
P-Reviewer: Asemi Z, Saudi Arabia S-Editor: Liu H L-Editor: A P-Editor: Zhang XD
Contributor Information
Ya-Zhao Zhang, Department of Neurosurgery, Hengshui People's Hospital, Hengshui 053000, Hebei Province, China.
Cong-Yi Zhang, Department of Ultrasound, Second People's Hospital of Hengshui City, Hengshui 053000, Hebei Province, China.
Ya-Nan Tian, Department of Neurology, Hengshui People's Hospital, Hengshui 053000, Hebei Province, China.
Yi Xiang, Department of Neurosurgery, Hengshui People's Hospital, Hengshui 053000, Hebei Province, China. sjwkxy@163.com.
Jian-Hui Wei, Department of Neurosurgery, Hengshui People's Hospital, Hengshui 053000, Hebei Province, China.
Data sharing statement
The data are available from the corresponding author.
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Associated Data
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Data Availability Statement
The data are available from the corresponding author.