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Background: Patients with non-traumatic intracerebral haemorrhage have a substantial risk of major adverse cardiovascular and cerebrovascular events, including ischaemic stroke, after surgery. The optimal timing of antiplatelet therapy after surgery for spontaneous intracerebral haemorrhage in patients at high risk of postoperative ischaemic events has not been characterised. We aimed to investigate the safety and efficacy of early versus late initiation of antiplatelet therapy after surgery for spontaneous intracerebral haemorrhage., Methods: This prospective, open-label, blinded-endpoint, randomised trial was done at eight stroke centres in China. Eligible patients were aged 18-70 years, undergoing surgery for the evacuation of spontaneous intracerebral haemorrhage, and had a high risk of postoperative ischaemic events. Using the minimisation method in an online randomisation system, patients were randomly assigned (1:1) to receive 100 mg acetylsalicylic acid once per day in either the early-start group (starting on the third day after surgery until the 90th day after surgery) or the late-start group (starting on the 30th day after surgery until the 90th day after surgery). Medication was taken orally or delivered via a feeding tube. The primary efficacy outcome was a composite of new major ischaemic cardiovascular, cerebrovascular, or peripheral vascular events within 90 days and the primary safety outcome was any intracranial bleeding within 90 days, both measured in the intention-to-treat population. The trial is registered at ClinicalTrials.gov, NCT04820972, and is complete., Findings: From May 1, 2021, to May 1, 2023, 7323 patients were screened, of whom 269 (4%) were enrolled and randomly assigned: 134 to the early-start group and 135 to the late-start group. 195 (72%) patients were male, 74 (28%) were female, and the median age was 60·2 years (IQR 52·0-66·5). Haematomas were supratentorial and deep in most (170 [63%] of 269) patients. Ischaemic major cardiovascular, cerebrovascular, or peripheral vascular events occurred within 90 days after surgery in 27 (20%) of 134 patients in the early-start group and 42 (31%) of 135 patients in the late-start group (odds ratio 0·56 [95% CI 0·32-0·98]; p=0·041). Intracranial bleeding occurred in one (1%) of 134 patients in the early-start group and four (3%) of 135 patients in the late-start group. Non-bleeding serious adverse events occurred in 57 (42%) of 134 patients in the early-start group and 57 (42%) of 135 patients in the late-start group., Interpretation: Starting acetylsalicylic acid on the third day after surgery for spontaneous intracerebral haemorrhage in Chinese patients at high risk of postoperative ischaemic events resulted in fewer postoperative ischaemic major cardiovascular, cerebrovascular, or peripheral vascular events than starting acetylsalicylic acid therapy at 30 days, with no increased risk of intracranial bleeding. Whether early initiation of acetylsalicylic acid therapy is safe and improves clinical outcomes for broader populations of patients with spontaneous intracerebral haemorrhage requires further research., Funding: The National Key Research and Development Program of China., Competing Interests: Declaration of interests SW declares support for the present manuscript, paid to their institution, from the National Key Research and Development Program of China. All other authors declare no competing interests., (Copyright © 2024 Elsevier Ltd. All rights reserved, including those for text and data mining, AI training, and similar technologies.)

Background: Aspirin is widely used for preventing ischaemic events. About 20%-40% of patients have aspirin resistance (ASR), which prevents them from benefiting from aspirin medication. This study aimed to develop and validate a model based on single-nucleotide polymorphism (SNP) to distinguish ASR patients., Methods: We included patients with spontaneous intracerebral haemorrhage and continuing antiplatelet therapy from a multicentre, prospective cohort study as the derivation cohort. Thromboelastography (inhibition of arachidonic acid channel<50%) was used to identify ASR. Genotyping was performed to identify the ASR-related SNP. Based on the result of the logistic analysis, the aspirin resistance in the Chinese population score (ASR-CN score) was established, and its accuracy was evaluated using the area under the curve (AUC). Patients receiving dual antiplatelet therapy for unruptured intracranial aneurysm embolism were prospectively included in the validation cohort. After embolism, 30-day ischaemic events, including ischaemic stroke, new or more frequent transient ischaemic attack, stent thrombosis and cerebrovascular death, were recorded., Results: The derivation cohort included 212 patients (155 male patients and the median age as 59). 87 (41.0%) individuals were identified with ASR. The multivariate logistic analysis demonstrated six SNPs of GP1BA, TBXA2R, PTGS2 and NOS3 as risk factors related to ASR. The ASR-CN score integrating these SNPs performed well to discriminate ASR patients from non-ASR patients (AUC as 0.77). Based on the validation cohort of 372 patients receiving antiplatelet therapy after embolism (including 130 ASR patients), the ASR-CN score continued to distinguish ASR patients with good accuracy (AUC as 0.80). Patients with high a ASR-CN score were more likely to suffer from 30-day ischaemic events after embolism (OR, 1.28; 95% CI, 1.10 to 1.50; p=0.002)., Conclusion: GP1BA, TBXA2R, PTGS2 and NOS3 were SNPs related to ASR. The ASR-CN score is an effective tool to discriminate ASR patients, which may guide antiplatelet therapy., Clinical Trial Registration: Surgical Treatments of Antiplatelet Intracerebral Hemorrhage cohort (unique identifier: ChiCTR1900024406, http://www.chictr.org.cn/edit.aspx?pid=40640&htm=4)., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Administration of acetylsalicylic acid (ASA) at early stage after surgery for spontaneous intracerebral hemorrhage (SICH) may increase the risk of postoperative intracranial bleeding (PIB), because of potential inhibition of platelet function. This study aimed to investigate whether early ASA administration after surgery was related to increased risk of PIB. This retrospective study enrolled SICH patients receiving surgery from September 2019 to December 2022 in seven medical institution. Based on postoperative ASA administration, patients who continuously received ASA more than three days within seven days post-surgery were identified as ASA users, otherwise as non-ASA users. The primary outcome was symptomatic PIB events within seven days after surgery. Incidence of PIB was compared between ASA users and non-ASA users using survival analysis. This study included 744 appropriate patients from 794 SICH patients. PIB occurred in 42 patients. Survival analysis showed no statistical difference between ASA users and non-ASA users in incidence of PIB (P = 0.900). Multivariate Cox analysis demonstrated current smoker (hazard ratio [HR], 2.50, 95%CI, 1.33-4.71, P = 0.005), dyslipidemia (HR = 3.03; 95%CI, 1.31-6.99; P = 0.010) and pre-hemorrhagic antiplatelet therapy (HR = 3.05; 95% CI, 1.64-5.68; P < 0.001) were associated with PIB. Subgroup analysis manifested no significant difference in incidence of PIB between ASA users and non-ASA users after controlling the effect from factors of PIB (i.e., sex, age, current smoker, regular drinker, dyslipidemia, pre-hemorrhagic antiplatelet therapy and hematoma location). This study revealed that early ASA administration to SICH patients after surgery was not related to increased risk of PIB., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Hematoma growth (HG) affects the prognosis of patients with spontaneous intracranial hematoma (ICH), but there is still a lack of evidence about the effects of aspirin (acetylsalicylic acid, ASA) on HG in patients with severe ICH. This study retrospectively analyzed patients with severe ICH who met the inclusion and exclusion criteria in Beijing Tiantan Hospital, Capital Medical University, between January 1, 2015, and July 31, 2019. Severe ICH patients were divided into ASA group and nASA groups according to ASA usage, and the incidence of HG between the groups was compared. Univariate analysis was performed by the Mann-Whitney U test, chi-square test, or Fisher exact test. Multivariate logistic regression analysis was used to analyze the impact of ASA on HG and to screen for risk factors of HG. In total, 221 patients with severe ICH were consecutively enrolled in this study. There were 72 (32.6%) patients in the ASA group and 149 patients in the nASA group. Although the incidence of HG in the nASA group was higher than that in the ASA group (34.9% VS 22.2%, p = 0.056), ASA did not significantly affect the occurrence of HG (p = 0.285) after adjusting for initial hematoma volume, high blood pressure at admission, coronary heart disease, and GCS at admission. In addition, we found that high blood pressure at admission was a risk factor for HG. Prior ASA does not increase the incidence of HG in severe ICH patients, and high blood pressure at admission is a risk factor for HG., (© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)