Initial CT blend sign is not associated with poor outcome in patients following stereotactic minimally invasive surgery

doi:10.21203/rs.3.rs-37415/v3

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Initial CT blend sign is not associated with poor outcome in patients following stereotactic minimally invasive surgery

https://doi.org/10.21203/rs.3.rs-37415/v3

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published 15 Apr, 2021

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Background: The initial computed tomography (CT) blend sign has been used as an imaging marker to predict haematoma expansion and poor outcomes in patients with a small volume intracerebral haemorrhage (ICH). However, the relationship between the blend sign and outcomes remains elusive. The present study aimed to retrospectively measure the impact of initial CT blend signs on short-term outcomes in patients with hypertensive ICH who underwent stereotactic minimally invasive surgery (sMIS).

Methods: We enrolled 242 patients with spontaneous ICH. Based on the initial CT features, the patients were assigned to a blend sign group (91 patients) or a nonblend sign (control) group (151 patients). The NIHSS, GCS and mRS were used to measure the effects of sMIS. The rates of severe pulmonary infection and cardiac complications were also compared between the two groups.

Results: No significant differences in NIHSS and GCS scores were observed between the two groups. The proportion of patients with good outcomes during follow-up was not different between the two groups. The rate of rehaemorrhaging increased in the blend sign group. No significant differences in severe pulmonary infections and cardiac complications were noted between the two groups.

Conclusions: The initial CT blend sign was not associated with poor outcomes in patients with hypertensive ICH who underwent sMIS. ICH patients with CT blend signs should undergo sMIS if they are suitable candidates for surgery.

Neurology

Neurosurgery

Intracerebral haemorrhage

Stereotactic techniques

Minimally invasive surgery

CT Blend sign

Glassgow Coma Scale

Spontaneous ICH is a devastating life-threatening disease with high global mortality and morbidity worldwide. To improve the outcomes of patients with ICH, various clinical medical and surgical trials for interventions for ICH have been conducted in the past 10 years¹. However, although research and trials of therapies for ICH have increased greatly, the 30-day mortality remains as high as 40% worldwide². No interventional therapy has been demonstrated to be effective in improving outcomes³. Open craniotomy haematoma evacuation in large clinical randomized trials has not shown benefits for patients with ICH⁴. Although craniotomy showed effectiveness in removing ICH, it resulted in substantial brain injury complicated by pulmonary infection⁴. The advantages of conventional surgical management over conservative medications for hypertensive ICH are controversial⁵. Patients with supratentorial ICH showed no overall benefit from early neurosurgical management compared with initial conservative treatment⁶. Brain injury due to conventional surgical procedures for ICH might counteract the potential benefits of haematoma removal during open surgery⁷. Recently, MIS for ICH management has been evaluated in numerous clinical trials and has achieved favourable results^8-10. Minimally invasive puncture and drainage are the least traumatic procedures and have the shortest operative times⁴. However, for moderate to large ICH, minimally invasive catheter evacuation followed by thrombolysis did not improve the proportion of patients who achieved a good response, and a haematoma size reduction to 15 ml or less was associated with improved mRS scores at 365 days in patients who were stabilized ⁴.

Haematoma expansion (HE) or haematoma growth predicts substantially worse prognosis and might be potentially preventable if high-risk patients could be identified in the early stage of ICH². Imaging markers, such as the blend signs, black hole signs and spot signs, have been identified as predicting HE^{2, 8-10}. The blend sign showed an association with poor outcome in patients with a small volume of ICH treated with medications². Our previous studies showed that the black hole sign and the blend sign predicted rehaemorrhage in patients with hypertensive ICH who underwent stereotactic minimally invasive surgery (sMIS) ^{11, 12}. However, whether the initial CT blend signs are associated with poor outcome in patients following sMIS remains unknown. We speculated that the initial CT blend signs are associated with poor outcome in patients with ICH receiving sMIS. The present study aimed to retrospectively observe the influence of the initial CT blend sign on outcomes in patients with spontaneous ICH following sMIS.

The Ethics Committee of the Affiliated Hospital of Guizhou Medical University approved this retrospective study. The study was performed based on the WMA Declaration of Helsinki. Patients with ICH admitted to our hospital who underwent sMIS were included in our study. The recruitment period was from January 1, 2018, to June 30, 2019.

Study design and participants

Study design

A retrospective analysis was performed. The authors aimed to determine whether initial CT blend signs were associated with poor functional outcome of patients with ICH following sMIS. We collected data from patients with ICH by reviewing the medical records of the Affiliated Hospital of Guizhou Medical University. The recruitment period was from January 1, 2018, to June 30, 2019. The patients were diagnosed using a baseline CT scan within 1 hour of admission, and surgery was performed within 27 hours of admission. The eligible patients with ICH were selected according to the inclusion criteria listed below. All eligible patients were treated by sMIS and were assigned to two groups based on their haematoma features.

The inclusion criteria were as follows: (1) patients over 18 years old with a history of hypertension or hypertension observed upon admission as well as symptoms and signs meeting the diagnostic criteria for ICH, which was confirmed using a nonenhanced CT scan; (2) patients who suffered from spontaneous ICH in the supratentorial area (the basal ganglia, thalamus or cerebral lobes); (3) patients with ICH volumes between 30 ml and 50 ml; (4) patients with no contraindications for surgery; and (4) the authorized representatives of the patients provided consent for surgery.

The exclusion criteria were the same as those in previously published studies¹². Patients with ICH located in the brainstem or with secondary ICH from haemorrhagic transformation from brain infarction were not included. Patients without authorized representative consent to surgery were also excluded from the study.

Participants

From January 1, 2018, to June 30, 2019, a total of 710 patients with spontaneous ICH were admitted to the Affiliated Hospital of Guizhou Medical University. Among them, 318 patients underwent sMIS. Of the 318 patients who underwent sMIS, 25 left the hospital within one week without medical orders, 21 patients experienced ICH in the brainstem, and another 30 patients displayed large-volume (over 50 mL) ICH on CT. These 76 patients were not included in the final analysis (Fig. 1).

Based on the inclusion criteria, 242 consecutive patients with spontaneous ICH were included in the present study. All patients in the present study underwent sMIS. The patients were assigned to the following groups based on their CT haematoma features: the blend sign group included 91 patients, and the nonblend sign group (control group) included 151 patients with spontaneous ICH. The baseline clinical characteristics of the patients are listed in Table 1.

Imaging analysis

The initial and follow-up CT scans (General Electric Medical Systems, Milwaukee, WI) were performed using standard clinical parameters with axial 3-mm-thick sections, a current of 225 mA, a window level of 39 and a window width of 120. The images were obtained and stored for further evaluation. The ICH for each patient was located in the supratentorial area (including the basal ganglia, thalamus or cerebral lobes). Two experts (one neurosurgical expert and one neuroimaging expert) who were blinded to the clinical information served as reviewers and independently evaluated the shape features of the haematomas. The shape of the haematoma was assessed by visual inspection¹⁶. The blend sign was determined by the criteria proposed in previously published studies¹³. Briefly, the haematoma blend sign was defined as follows: (1) blending of a relatively hypoattenuating area with an adjacent hyperattenuating region within a haematoma; (2) presence of a well-defined margin between the hypoattenuating area and adjacent hyperattenuating region that is easily recognized by the naked eye; (3) the haematoma should have at least an 18 Hounsfield unit difference between the 2 density regions; and (4) the relatively hypoattenuating area was not encapsulated by the hyperattenuating region.
Discrepancies about the presence of the blend signs were settled by joint discussion between the readers.

Haematoma volumes were estimated based on CT using the ABC/2 formula (t=π/6×l×s×slice) ¹⁴. The criteria for identifying the blend sign were the same as those reported in the literature¹³. The blend sign was composed of two parts with different densities on CT (Fig. 2).

Patient treatment

sMIS for ICH evacuation

The sMIS procedures for ICH evacuation were the same as those used in our previously published studies ^{19, 22, 23}. To remove the influences of surgical technical factors on the outcomes, surgical procedures were performed by two experienced neurosurgeons. Briefly, a stereotactic instrument was fixed on the patient’s skull, and a repeated CT scan was performed for each patient prior to surgery. After the repeating CT scan was performed, the patient was transferred to the operating room. Using the CT scan, the coordinates of the ICH were determined, and we punctured the skull using a 3-mm-diameter needle (with a drill integrated into the needle guard) under the guidance of the stereotactic instrument. After the drill was replaced by a blunt-tip plastic needle core, the LY-1-type puncture-needle set was inserted slightly into the haematoma. Following removal of the plastic-needle core, the liquid part of the haematoma was aspirated using a 10-ml syringe (Fig. 3). The aspiration was stopped after the first resistance was encountered, and the needle guard connected to a plastic tube was retained for several days for drainage. The patients were transferred to the intensive care unit after removing the location framework and stereotactic apparatus. Then, 50,000 units of urokinase (diluted in 2 ml of normal saline) were injected slowly every 8 hours into the residual haematoma area to dissolve the solid part of the haematoma. The needle system was closed for 2 hours before reopening to allow spontaneous drainage. The first postoperative follow-up CT scan was performed on the day following surgery, and the second postoperative CT was performed on the third day after surgery. Some patients needed a third or even a fourth postoperative follow-up CT scan. If the patients showed neurological deterioration at any time after surgery, a repeated CT scan was performed.

Medications

All patients in our study received the same medical management based on the guidelines for the treatment of hypertensive ICH¹⁵. More comprehensive measures were also taken in all patients, including the prevention of deep-venous thrombosis (DVT), the control of temperature and blood glucose, nutritional support, and the prevention of other complications. The main measures used for preventing DVT were to move the paralysed limbs slowly and to wear socks. No anticoagulants were used to prevent DVT during the hospital stay because they might induce haemorrhage.

Functional outcomes

The primary functional outcome was a good functional outcome, defined as the proportion of patients who achieved a modified Rankin Scale (mRS) score of 0–3 at discharge. The mRS was conducted by neurological experts blinded to both the study and the imaging. The secondary outcomes included the National Institutes of Health Stroke Scale (NIHSS) scores, the Glasgow Coma Scale (GCS) scores and the ICH volume changes. The outcome was considered favourable if the mRS score was 0–3 points. In contrast, if the mRS score was >3 points, the outcome was considered poor⁴. The GCS and NIHSS scores were assessed upon admission and at one and two weeks after surgery by experienced neurological experts. Mortality and complications were recorded during the hospital stay and were compared between the two groups.

Complications

Some patients suffered from life-threatening complications during their hospital stays. Severe cardiopulmonary complications included severe pulmonary infection, respiratory failure, and heart failure. The cardiopulmonary complications were those that occurred during their hospital stay. Exacerbations of chronic heart failure and respiratory failure, as well as community-acquired pneumonia, were not included.

Postoperative rehaemorrhaging was defined as when the ICH (hyperdensity) reappeared in the haematoma region on the follow-up CT scan after it was removed completely following surgery¹². An increase in the haematoma volume of >33%¹⁶ compared with the ICH volume determined by using the previous CT scan, which showed significantly decreased ICH volume after sMIS, was also considered a case of postoperative rehaemorrhage.

Statistical analysis

On the basis of the assumption that 25% of patients would have a mRS score of 0-3 in the blend sign group versus 45% of patients would have a mRS score of 0–3 following sMIS in the control group⁴, we estimated that 90 patients in each group would provide 81.0% statistical power at an α level of 0.05. The permissible error d was 0.1.

A commercially available software package (SPSS, Version 22.0) was used to perform the statistical analyses. Categorical data are expressed as proportions, and continuous variables are presented as the mean and SD. Demographic, clinical, and radiological characteristics were compared between patients with shape-regular or shape-irregular ICH using Student’s t tests (for normal distribution) or nonparametric tests (if the data were not normally distributed). A difference in the GCS and NIHSS scores between different time points was analysed using the method of repeated measures. A p value less than 0.05 was considered to indicate a statistically significant difference. The independent association between the initial CT blend sign and the outcome of patients after sMIS was evaluated using binary logistic regression. The interobserver reliability of the CT blend sign was assessed by calculating the κ values. The κ values were categorized as reported in the literature¹². A κ value equal to 1 indicated total agreement between the observers.

The baseline data

During the recruitment period, 318 patients were assessed for eligibility. Of the 318 patients, 242 with ICH met our inclusion criteria. One hundred eighty patients were men, and 69 were women. The ages ranged from 31 to 93 years, with an average of 57.05±12.703. The time from onset to baseline CT was 5.0 (2.0–9.7) hours. The mean admission GCS score was 11 (8–13), and the mean NIHSS score was 16 (14-20). One hundred eighty-four patients showed haematoma in the basal ganglia area, 34 patients in the cerebral lobes, and 24 patients in the thalamus.

Based on their haematoma features, the 242 included patients with ICH were assigned to the abovementioned two study groups. No significant differences were noted between the blend sign group and the control group in age, history of smoking, drinking, preoperative ICH volume, anticoagulants, GCS score on admission, NIHSS score on admission, time from onset to admission, time from onset to baseline CT, and time from onset to surgery. Only the blend sign group showed a higher rate of hypertension history (Table 1).

Discrepancies between the neurosurgeon and the radiologist were noted in 3 patients. The interobserver agreement for identifying the shape features of the haematoma was good and reliable between the 2 readers, with a κ value of 0.974 and a 95% confidence interval of 0.94-1.00.

Changes in haematoma volume

Compared with the control group, the blend sign group did not show significant changes in the ICH volume or the time for removal of the drainage tube. The rates of ICH clearance between the blend sign group and the nonblend sign group were also similar. No significant differences were observed between the two groups (Fig. 4, Table 2). These findings demonstrated that the blend sign did not affect the removal of ICH by sMIS.

Changes in the GCS and the NIHSS

The GCS and the NIHSS were determined at one and two weeks after surgery. The blend sign group and the control group showed significantly greater GCS and lower NIHSS at one and two weeks after surgery compared with those on admission (Tables 3 and 4). However, no significant difference was observed between the two groups. These findings suggested that patients with the blend sign on initial CT would obtain the same short-term outcome as nonblend sign patients after sMIS.

Complications

The blend sign group showed similar rates of severe complications, including pulmonary infection and heart failure, compared with the control group (P>0.05, Table 5). However, the blend sign group showed a higher rate of rehaemorrhage than the control group (P=0.049).

Influences of the CT blend sign on the outcome following sMIS

Of the 91 patients with CT blend signs, 50 (54.9%) showed good outcomes. In 151 patients without blend signs, 71 (51.8%) showed good outcomes. No significant differences between the two groups were observed. In 128 patients with good outcomes, 50 (39.1%) had blend signs on the initial CT scan. To determine whether the CT blend signs were associated with poor outcomes, we performed a univariate analysis first and then conducted a binary logistic regression. The history of hypertension (P=0.037), NIHSS score upon admission (P<0.001), and GCS score upon admission (P<0.001) showed statistical significance (Table 6). The blend sign showed no statistical significance with the poor outcome. Therefore, only the history of hypertension, the initial NIHSS score and the GCS score went into the binary logistic regression model. The final results suggested that the initial NIHSS score or the GCS score was an independent predictor of poor functional outcome in patients with ICH following sMIS (Table 7).

Spontaneous ICH is the most common subtype of haemorrhagic stroke. The incidence of ICH accounts for approximately 10%–30% of all types of stroke worldwide. HE predicts substantially poor outcomes and is potentially preventable if high-risk patients could be identified in the early stage of ICH⁸. The initial CT blend sign could predict HE and was associated with poor outcome in patients who received medication management ¹⁷. The blend signs also showed a close association with postoperative rebleeding in patients with ICH following sMIS¹².

Minimally invasive procedures have been used to treat patients with ICH for more than ten years. These procedures were shown to remove ICH with minimal traumatic brain injury and to be beneficial for neurofunctional recovery^{18, 19}. Minimally invasive catheter aspiration of ICH followed by medications for dissolving the clot could be another choice of surgical approach as a therapeutic strategy for ICH²⁰. Minimally invasive puncture and drainage showed the least trauma to the brain and had the shortest operative time⁴. Our previously published studies demonstrated that the initial CT blend signs showed a close association with postoperative rehaemorrhage in ICH patients following sMIS ¹². Therefore, we postulated that the blend signs could affect the outcome of patients with ICH following sMIS. In the present study, the GCS, NIHSS, mRS and postoperative complications were used as indexes to evaluate the outcome. However, the authors were unable to obtain the expected results. The GCS increased and the NIHSS decreased significantly at two weeks after surgery compared with those on admission. However, there were no significant differences between the blend sign group and the control group. The proportions of patients with favourable outcomes were compared between the patients with blend signs and the control subjects, and no significant difference was observed. Secondary complications after ICH are associated with prognosis^{21, 22}. Pneumonia was the most common medical complication (15.1%) after ICH²³. Cardiac complications (5.9%) also often occur after ICH due to neuroendocrine changes such as changes in catecholamine levels and elevated levels of brain natriuretic peptide

In the present study, the patients with blend signs following sMIS had similar rates of severe pulmonary infection and heart failure as those without blend signs. No significant difference was observed between the two groups, suggesting that the blend sign was not associated with the rate of complications following sMIS. The blend sign group showed a higher rate of postoperative rehaemorrhage than in our previously published study¹². Although the blend signs predicted poor outcome in patients with small volumes of ICH, no evidence demonstrates that blend signs were associated with poor outcome in patients following sMIS. sMIS should be performed to treat patients with blend signs on initial CT scans if the ICH volume is large enough and the patients are suitable candidates for surgery.

There were some limitations in the present study. The patients were not followed up after discharge. Therefore, we were unable to observe the long-term outcomes. Some patients were discharged from the hospital without medical orders, and mortality could not be recorded and compared, as no deaths occurred during their hospital stay. The present study was retrospective; randomized prospective studies with larger sample sizes are required in the future.

In conclusion, sMIS could remove intracerebral haematomas effectively. The initial CT blend signs are not associated with poor outcomes among patients with ICH following sMIS. ICH patients with CT blend signs obtained the same outcome as patients without the CT blend sign after sMIS.

ICH: intracerebral haemorrhage; CT: computed tomography; sMIS: stereotactic minimally invasive surgery; GCS: Glasgow Coma Scale; NIHSS: National Institute of Health Stroke Scale

Acknowledgements

We are grateful for the help provided by the Image Department of the Affiliated Hospital of Guizhou Medical University in the analysis of the computed tomography scans. We also wish to thank all the postgraduates who were involved in this study for their hard work.

Funding

This research was supported by the Natural Science Foundation of China (81971126/H0906), the Medical Speciality and Community Project Construction in Baoshan District – Neurorehabilitation Speciality (BSZK-2018-A01) as well as the High-level Overseas Talents Innovation and Entrepreneurship Merit-based Funding Projects ［(2020) 05］. The funding body did not take part in the design of the study or the collection, analysis, and interpretation of data or in the writing of the manuscript.

Consent for publication

Not applicable.

Competing of interests

The authors declare that they have no competing interests.

Authors’ contributions

GW, LW and JL conceived of the study, participated in the design of the study, coordinated the study and drafted the manuscript. XY, LZ, YL and YM conducted the clinical study. YZ and LW performed the statistical analyses and revised the manuscript. All the authors read and approved the final manuscript.

Availability of data and materials statement

The datasets analysed in the current study are available from the corresponding author upon reasonable request.

Ethics approval and consent to participate

All the patients’ authorized representatives and those patients who had the ability to communicate with the doctors agreed to participate in the study. Informed consent was obtained in written form.

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Table1. Baseline data between blend sign group and control group

Factors	Blend sign group(91)	Control group（151）		χ²/Z	P-value
Ages（years, x±ｓ）	56.18±12.61		57.58±12.77	-0.814	0.416
Gender（male，%）	73（80.2%）		107（70.9）	2.610	0.106
History of smoking（n,%）	46（50.5%）		75（49.7%）	0.018	0.500
History of drinking（n,%）	41（45.1%）		67（46.9%）	0.1072	0.447
History of hypertension（n,%）	68（74.7%）		110（56.7%）	8.582	0.004
Anticoagulants（n,%）	2（2,2%）		4（2.6%）	0.048	0.594
History of diabetes（n，%）	2（2.2%）		10（6.4%）	2.177	0.119
Haematoma volume（ml, IQR）	37.8(33-52.5)		38(31-50)	-0.879	0.379
Systolic pressure（mmHg, x±ｓ）	174.03±24.96		173.33±29.53	-0.190	0.844
Diastolic pressure（mmHg, x±ｓ）	103.75±15.67		100.63±21.70	1.292	0.198
GCS on admission（points, IQR）	11（8-13）		11（7-13）	-0.550	0.583
NIHSS on admission（points, IQR）	16（14-19）		14（16-21）	-1.029	0.304
Time from onset to baseline CT（h, IQR）	4（2-8）		5（2.5-10）	-1.860	0.163
Time from admission to surgery（h, IQR）	15（9-27）		15（9.8-27）	-0.728	0.466
Duration of surgery（h, IQR）	1.4（1.0-1.9）		1.5（1.0-2.0）	-1.513	0.130
Time for removing the tube（days，IQR）	4(2-6)		4（3-6）	-0.121	0.904
Good outcome (n, %)	50（54.9）		78（51.7）	0.247	0.619
Poor outcome (n, %)	41（45.1）		73（48.3）	0.247	0.619

GCS=Glasgow Coma Scale; NIHSS=National Institute of Health Stroke Scale

Table 2.Changes of residual haematoma volume and rate of ICH clearance during surgery

Group	Preoperative ICH volume（ml, IQR）	Postoperative Residual ICH volume（ml, IQR）	Rate of ICH clearance during surgery（%, IQR）	Time for removing the tube（days, IQR）
blend group（n=91）	37.8(33-52.5)	8（3.87-15）	30.61（8.67-56.67）	4（2-6）
Control group（n=151）	38.0(31-50)	8（4.5-12）	37.27（18.98-55.69）	4（3-6）
Z（P-value）	-0.879（0.379）	-0.456（0.648）	-0.241(0.809)	-1.121（0.904）

Table 3. Changes of GCS between the blend sign group and control group（IQR）

Group	On admission	One week	Two weeks	χ²/（P-value）
blend sign group（n=91）	11（8-13）	12（9-13）*	13（12-15）^&	8.627(0.013)
control group（n=151）	11（7-13）	12（8-14）*	13（9-15）^&	22.974(0.000)
Z（P-value）	-1.029（0.304）	-0.239（0.811）	-1.136（0.256）

*Compared with those on admission（P<0.05）.^&Compared with those on admission or with one week （P<0.05）. These results suggested that the GCS were improved one week after the surgery.

Table 4. Changes of NIHSS between the blend sign group and the control group（IQR）

Group	On admission	One week	Two weeks	F（P-value）
Blend sign group(n=91)	16（14-20）	13（9-17）^$	10（6-13）^$	81.475(0.000)
control group（n=151）	16（13-20）	14（10-18）^$	12（8-15）^$	99.987(0.000)
Z（P-value）	-2.075（0.381）	-1.537（0.124）	-0.654（0.513）

^$Compared with those on admission（P<0.05）.The NIHSS did not show any difference between the two groups at any time point.

Table 5 .Comparison of severe complication rate and final outcome（n,%）

Group	Pulmonary infection	Heart failure	Postoperative rehaemorrhage	good outcome
Blend sign group(n=91)	19(20.9%)	2(2.2%)	23(25.6) ^&	50（54.9%）
control group（n=151）	30(19.87%)	7(4.6%)	23(15.2)	78 (51.7%)
c²（P-value）	0.036（0.850）	0.943（0.275）	3.892(0.049)	0.247（0.358）

^&Compared with the control group（P<0.05）. The rate of postoperative rehaemorrhage was increased compared with the control group. No significant differences were observed in the outcome between the two groups.

Table 6. Univariate analysis of predictors for poor outcome of patients underwent sMIS

Factors	Good outcome (128 patients)	Poor outcome(114 patients)	Z/T	P-value
Ages（x±ｓ）	55.91±12.55	58.43±12.81	1.493	0.137
Gender（male，%）	96（75.0%）	84（73.7%）	0.055	0.815
History of smoking（n,%）	63（49.2%）	57（50.4%）	0.0363	0.850
History of drinking（n,%）	51（39.8%）	57（50.0%）	2.517	0.113
History of hypertension（n,%）	87（68.0%）	91（79.8%）	4.357	0.037
Anticoagulants（n,%）	3（2.3%）	4（3.5%）	0.291	0.589
History of diabetes（n，%）	4（3.1%）	9（7.9%）	2.699	0.100
Systolic pressure（mmHg, x±ｓ）	171.17±26.557	176.32±29.113	1.437	0.152
Diastolic pressure（mmHg, x±ｓ）	101.07±19.733	102.62±19.676	0.612	0.541
GCS on admission（points, IQR）	12 (10-13.75)	9 (6-12))	-3.672	0.000
NIHSS on admission（points, IQR）	16 (13-18)	17 (15-22)	4.105	0.000
Time from onset to baseline CT (hour, IQR)	5.0(2.0-9.9)	4.55(2.0-9.7)	0.301	0.764
ICH volume on admission（ml, IQR）	36(32-50)	40(30.75-52.39)	0.120	0.2904
Haematoma ruptured into ventricles（n,%）	43（33.6%）	47（41.2%）	1.504	0.220
Time from onset to surgery（h, IQR）	16(8.13-26.75)	13.5(10-27)	0.288	0.773
Duration of surgery (h, IQR)	1.2(1.0-2.0)	1.5(1.0-2.0)	-0.288	0.773
Blend sign（n，%）	50（39.1）	41（36.0）	0.247	0.619
Non-blend sign （n，%）	78 (60.9)	73 (64.0)	0.247	0.619

GCS=Glasgow Coma Scale; NIHSS=National Institute of Health Stroke

Table 7. Binary logistic regression analysis of predictors for poor outcome

Variables	B	Wals	OR	95%CI	P
History of hypertension	3.170	2.691	23.800	0.539-1.050	0.101
GCS on admission	0.577	4.140	1.781	1.021-3.106	0.042
NIHSS on admission	0.522	4.649	1.686	1.049-2.710	0.031

Note: only the GCS and NIHSS on admission were associated with the poor outcome. The blend sign on initial CT has no effects on the outcome of patients who underwent a minimally invasive surgery.

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Initial CT blend sign is not associated with poor outcome in patients following stereotactic minimally invasive surgery

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