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Yang C, Miao H. The Authors Reply: Sex Differences in Outcome of Aneurysmal Subarachnoid Hemorrhage and its Relation to Postoperative Cerebral Ischemia. Neurocrit Care 2024:10.1007/s12028-024-02125-9. [PMID: 39313697 DOI: 10.1007/s12028-024-02125-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2024] [Accepted: 08/30/2024] [Indexed: 09/25/2024]
Affiliation(s)
- Cheng Yang
- Department of Neurosurgery, Southwest Hospital, Army Medical University, Chongqing, 400038, China
| | - Hongping Miao
- Department of Neurosurgery, Southwest Hospital, Army Medical University, Chongqing, 400038, China.
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Lim J, Aguirre AO, Baig AA, Levy BR, Ladner LR, Crider C, Garay-Morales S, Yu Alfonzo S, Galloza D, Jaikumar V, Monteiro A, Kuo CC, Vakharia K, Lai PMR, Snyder KV, Davies JM, Siddiqui AH, Levy EI. Global Disparities in the Presentation and Management of Aneurysmal Subarachnoid Hemorrhage: A Review and Analysis. World Neurosurg 2024; 187:202-210.e4. [PMID: 38750883 DOI: 10.1016/j.wneu.2024.05.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 05/06/2024] [Accepted: 05/07/2024] [Indexed: 07/07/2024]
Abstract
OBJECTIVE Aneurysmal subarachnoid hemorrhage (aSAH) is associated with high mortality rates. There is a significant gap in the literature describing global disparities in demographics, management, and outcomes among patients with aSAH. We aimed to conduct a systematic review and meta-analysis to assess global disparities in aSAH presentation and management. METHODS PubMed and Embase databases were queried from earliest records to November 2022 for aSAH literature. Presentation, demographics, comorbidities, treatment methods, and outcomes data were collected. Articles that did not report aSAH-specific patient management and outcomes were excluded. Pooled weighted prevalence rates were calculated. Random effects model rates were reported. RESULTS After screening, 33 articles representing 10,553 patients were included. The prevalence of Fisher grade 3 or 4 aSAH in high- and lower-income countries (HIC and LIC), respectively, was 79.8% (P < 0.01) and 84.1 (P < 0.01). Prevalence of male aSAH patients in HIC and LIC, respectively, was 35.8% (P < 0.01) and 45.0% (P < 0.01). Prevalence of treatment in aSAH patients was 99.5% (P < 0.01) and 99.4% (P = 0.16) in HIC and LIC, respectively. In HIC, 35% (P < 0.01) of aneurysms in aSAH patients were treated with coiling. No LIC reported coiling for aSAH treatment; LIC only reported rates of surgical clipping, with a total prevalence of 92.4% (P < 0.01) versus 65.6% (P < 0.01) in HIC. CONCLUSION In this analysis, we found similar rates of high-grade SAH hemorrhages in HIC and LIC but a lack of endovascular coil embolization treatments reported in LIC. Additional research and discussion are needed to identify reasons for treatment disparities and intervenable societal factors to improve aSAH outcomes worldwide.
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Affiliation(s)
- Jaims Lim
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA
| | - Alexander O Aguirre
- Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA
| | - Ammad A Baig
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA
| | - Bennett R Levy
- George Washington University School of Medicine, Washington, District of Columbia, USA
| | - Liliana R Ladner
- School of Medicine, Virginia Tech Carilion, Roanoke, Virginia, USA
| | - Corianne Crider
- George Washington University School of Medicine, Washington, District of Columbia, USA
| | - Steven Garay-Morales
- George Washington University School of Medicine, Washington, District of Columbia, USA
| | - Sabrina Yu Alfonzo
- George Washington University School of Medicine, Washington, District of Columbia, USA
| | - Daniel Galloza
- George Washington University School of Medicine, Washington, District of Columbia, USA
| | - Vinay Jaikumar
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA
| | - Andre Monteiro
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA
| | - Cathleen C Kuo
- Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA
| | - Kunal Vakharia
- Department of Neurosurgery and Brain Repair, University of South Florida, Tampa, Florida, USA
| | - Pui Man Rosalind Lai
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA; Canon Stroke and Vascular Research Center, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Jacobs Institute, Buffalo, New York, USA
| | - Kenneth V Snyder
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA; Canon Stroke and Vascular Research Center, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Jacobs Institute, Buffalo, New York, USA
| | - Jason M Davies
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA; Canon Stroke and Vascular Research Center, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Jacobs Institute, Buffalo, New York, USA; Department of Biomedical Informatics, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA
| | - Adnan H Siddiqui
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA; Canon Stroke and Vascular Research Center, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Jacobs Institute, Buffalo, New York, USA; Department of Radiology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA
| | - Elad I Levy
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo, New York, USA; Canon Stroke and Vascular Research Center, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA; Jacobs Institute, Buffalo, New York, USA; Department of Radiology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York, USA.
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Stretti F, Utebay D, Bögli SY, Brandi G. Sex differences in the use of mechanical ventilation in a neurointensive care population: a retrospective study. BMC Pulm Med 2024; 24:284. [PMID: 38890713 PMCID: PMC11184830 DOI: 10.1186/s12890-024-03094-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 06/09/2024] [Indexed: 06/20/2024] Open
Abstract
BACKGROUND In the general intensive care unit (ICU) women receive invasive mechanical ventilation (IMV) less frequently than men. We investigated whether sex differences in the use of IMV also exist in the neurocritical care unit (NCCU), where patients are intubated not only due to respiratory failure but also due to neurological impairment. METHODS This retrospective single-centre study included adults admitted to the NCCU of the University Hospital Zurich between January 2018 and August 2021 with neurological or neurosurgical main diagnosis. We collected data on demographics, intubation, re-intubation, tracheotomy, and duration of IMV or other forms of respiratory support from the Swiss ICU registry or the medical records. A descriptive statistics was performed. Baseline and outcome characteristics were compared by sex in the whole population and in subgroup analysis. RESULTS Overall, 963 patients were included. No differences between sexes in the use and duration of IMV, frequency of emergency or planned intubations, tracheostomy were found. The duration of oxygen support was longer in women (men 2 [2, 4] vs. women 3 [1, 6] days, p = 0.018), who were more often admitted due to subarachnoid hemorrhage (SAH). No difference could be found after correction for age, diagnosis of admission and severity of disease. CONCLUSION In this NCCU population and differently from the general ICU population, we found no difference by sex in the frequency and duration of IMV, intubation, reintubation, tracheotomy and non-invasive ventilation support. These results suggest that the differences in provision of care by sex reported in the general ICU population may be diagnosis-dependent. The difference in duration of oxygen supplementation observed in our population can be explained by the higher prevalence of SAH in women, where we aim for higher oxygenation targets due to the specific risk of vasospasm.
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Affiliation(s)
- Federica Stretti
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, Zürich, 8091, Switzerland
| | - Didar Utebay
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, Zürich, 8091, Switzerland
| | - Stefan Yu Bögli
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, Zürich, 8091, Switzerland
- Department of Neurology, Clinical Neuroscience Center, University Hospital Zurich, Frauenklinikstrasse 26, Zürich, 8091, Switzerland
| | - Giovanna Brandi
- Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, Zürich, 8091, Switzerland.
- Universitätsspital Zürich - Neurointensivstation, Rämistrasse 100, Zürich, 8091, Switzerland.
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Berli S, Barbagallo M, Keller E, Esposito G, Pagnamenta A, Brandi G. Sex-Related Differences in Mortality, Delayed Cerebral Ischemia, and Functional Outcomes in Patients with Aneurysmal Subarachnoid Hemorrhage: A Systematic Review and Meta-Analysis. J Clin Med 2024; 13:2781. [PMID: 38792323 PMCID: PMC11122382 DOI: 10.3390/jcm13102781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 04/30/2024] [Accepted: 05/06/2024] [Indexed: 05/26/2024] Open
Abstract
Background/Objective: Sex-related differences among patients with aneurysmal subarachnoid hemorrhage (aSAH) and their potential clinical implications have been insufficiently investigated. To address this knowledge gap, we conduct a comprehensive systematic review and meta-analysis. Methods: Sex-specific differences in patients with aSAH, including mortality, delayed cerebral ischemia (DCI), and functional outcomes were assessed. The functional outcome was dichotomized into favorable or unfavorable based on the modified Rankin Scale (mRS), Glasgow Outcome Scale (GOS), and Glasgow Outcome Scale Extended (GOSE). Results: Overall, 2823 studies were identified in EMBASE, MEDLINE, PubMed, and by manual search on 14 February 2024. After an initial assessment, 74 studies were included in the meta-analysis. In the analysis of mortality, including 18,534 aSAH patients, no statistically significant differences could be detected (risk ratio (RR) 0.99; 95% CI, 0.90-1.09; p = 0.91). In contrast, the risk analysis for DCI, including 23,864 aSAH patients, showed an 11% relative risk reduction in DCI in males versus females (RR, 0.89; 95% CI, 0.81-0.97; p = 0.01). The functional outcome analysis (favorable vs. unfavorable), including 7739 aSAH patients, showed a tendency towards better functional outcomes in men than women; however, this did not reach statistical significance (RR, 1.02; 95% CI, 0.98-1.07; p = 0.34). Conclusions: In conclusion, the available data suggest that sex/gender may play a significant role in the risk of DCI in patients with aSAH, emphasizing the need for sex-specific management strategies.
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Affiliation(s)
- Sarah Berli
- Faculty of Medicine, University of Zurich, 8032 Zurich, Switzerland
- Neurocritical Care Unit, Department of Neurosurgery, Institute for Intensive Care Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Massimo Barbagallo
- Neurocritical Care Unit, Department of Neurosurgery, Institute for Intensive Care Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Emanuela Keller
- Faculty of Medicine, University of Zurich, 8032 Zurich, Switzerland
- Neurocritical Care Unit, Department of Neurosurgery, Institute for Intensive Care Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
- Clinical Neuroscience Center, University Hospital Zurich and University of Zurich, 8091 Zurich, Switzerland
| | - Giuseppe Esposito
- Clinical Neuroscience Center, University Hospital Zurich and University of Zurich, 8091 Zurich, Switzerland
- Department of Neurosurgery, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Alberto Pagnamenta
- Clinical Trial Unit, Ente Ospedaliero Cantonale, 6900 Lugano, Switzerland
- Department of Intensive Care, Ente Ospedaliero Cantonale, 6900 Lugano, Switzerland
- Division of Pneumology, University of Geneva, 1211 Geneva, Switzerland
| | - Giovanna Brandi
- Faculty of Medicine, University of Zurich, 8032 Zurich, Switzerland
- Neurocritical Care Unit, Department of Neurosurgery, Institute for Intensive Care Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
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Han Y, Zhang B, Qi X, Yuan G, Li X, Hao G, Liang G. Comparison of sex differences on outcomes after aneurysmal subarachnoid hemorrhage: a propensity score-matched analysis. BMC Neurol 2024; 24:153. [PMID: 38704548 PMCID: PMC11069223 DOI: 10.1186/s12883-024-03659-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 04/30/2024] [Indexed: 05/06/2024] Open
Abstract
OBJECTIVE Sex differences in outcomes of patients with aneurysmal subarachnoid hemorrhage (aSAH) remain controversial. Therefore, the aim of this study was to investigate the sex differences in the prognosis of patients with aSAH. METHODS This study retrospectively analyzed the clinical data of aSAH patients admitted to the Department of Neurosurgery of General Hospital of Northern Theater Command, from April 2020 to January 2022. The modified Rankin Scale (mRS) was used to evaluate outcomes at 3-month post-discharge. Baseline characteristics, in-hospital complications and outcomes were compared after 1:1 propensity score matching (PSM). RESULTS A total of 665 patients were included and the majority (63.8%) were female. Female patients were significantly older than male patients (59.3 ± 10.9 years vs. 55.1 ± 10.9 years, P < 0.001). After PSM, 141 male and 141 female patients were compared. Comparing postoperative complications and mRS scores, the incidence of delayed cerebral ischemia (DCI) and hydrocephalus and mRS ≥ 2 at 3-month were significantly higher in female patients than in male patients. After adjustment, the analysis of risk factors for unfavorable prognosis at 3-month showed that age, sex, smoking, high Hunt Hess grade, high mFisher score, DCI, and hydrocephalus were independent risk factors. CONCLUSION Female patients with aSAH have a worse prognosis than male patients, and this difference may be because females are more vulnerable to DCI and hydrocephalus.
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Affiliation(s)
- Yuwei Han
- Department of Neurology, General Hospital of Northern Theater Command, NO.83, Wenhua Road, Shenhe District, Shenyang, 110016, Liaoning, China
| | - Bingying Zhang
- Department of Neurology, General Hospital of Northern Theater Command, NO.83, Wenhua Road, Shenhe District, Shenyang, 110016, Liaoning, China
| | - Xin Qi
- Department of Neurology, General Hospital of Northern Theater Command, NO.83, Wenhua Road, Shenhe District, Shenyang, 110016, Liaoning, China
| | - Guanqian Yuan
- Department of Neurology, General Hospital of Northern Theater Command, NO.83, Wenhua Road, Shenhe District, Shenyang, 110016, Liaoning, China
| | - Xiaoming Li
- Department of Neurology, General Hospital of Northern Theater Command, NO.83, Wenhua Road, Shenhe District, Shenyang, 110016, Liaoning, China.
| | - Guangzhi Hao
- Department of Neurology, General Hospital of Northern Theater Command, NO.83, Wenhua Road, Shenhe District, Shenyang, 110016, Liaoning, China.
| | - Guobiao Liang
- Department of Neurology, General Hospital of Northern Theater Command, NO.83, Wenhua Road, Shenhe District, Shenyang, 110016, Liaoning, China.
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Asikainen A, Korja M, Kaprio J, Rautalin I. Sex Differences in Case Fatality of Aneurysmal Subarachnoid Hemorrhage: A Systematic Review. Neuroepidemiology 2024:1-14. [PMID: 38599189 DOI: 10.1159/000538562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 03/19/2024] [Indexed: 04/12/2024] Open
Abstract
INTRODUCTION Aneurysmal subarachnoid hemorrhage (SAH) is more common in women than in men, contrary to most cardiovascular diseases. However, it is unclear whether the case fatality rate (CFR) of SAH also differs by sex. Thus, we performed a systematic review to address the relationship between sex and SAH CFRs. METHODS We conducted a systematic literature search in PubMed, Scopus, and Cochrane library databases. We focused on population-based studies that included both nonhospitalized and hospitalized SAHs and had either reported 1-month (28-31 day) SAH CFRs separately for men and women or calculated risk estimates for SAH CFR by sex. For quality classification, we used the Cochrane Collaboration Handbook and Critical Appraisal Skills Program guidelines. We pooled the study cohorts and calculated relative risk ratios (RRs) with 95% confidence intervals (CIs) for SAH death between women and men using a random-effects meta-analysis model. RESULTS The literature search yielded 5,592 initial publications, of which 33 study cohorts were included in the final review. Of the 33 study cohorts, only three reported significant sex differences, although the findings were contradictory. In the pooled analysis of all 53,141 SAH cases (60.3% women) from 26 countries, the 1-month CFR did not differ (RR = 0.99 [95% CI: 0.93-1.05]) between women (35.5%) and men (35.0%). According to our risk-of-bias evaluation, all 33 study cohorts were categorized as low quality. The most important sources of bias risks were related to the absence of proper confounding control (all 33 study cohorts), insufficient sample size (27 of 33 study cohorts), and poor/unclear diagnostic accuracy (27 of 33 study cohorts). CONCLUSION Contrary to SAH incidence rates, the SAH CFRs do not seem to differ between men and women. However, since none of the studies were specifically designed to examine the sex differences in SAH CFRs, future studies on the topic are warranted.
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Affiliation(s)
- Aleksanteri Asikainen
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland,
| | - Miikka Korja
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Jaakko Kaprio
- Institute for Molecular Medicine FIMM, University of Helsinki, Helsinki, Finland
| | - Ilari Rautalin
- Department of Neurosurgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- The National Institute for Stroke and Applied Neurosciences, Auckland University of Technology, Auckland, New Zealand
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Fitzhugh N, Rasmussen LR, Simoni AH, Valentin JB. Misuse of multinomial logistic regression in stroke related health research: A systematic review of methodology. Eur J Neurosci 2023; 58:3116-3131. [PMID: 37442794 DOI: 10.1111/ejn.16084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 06/13/2023] [Accepted: 06/17/2023] [Indexed: 07/15/2023]
Abstract
Multinomial logistic regression (MLR) is often used to model the association between a nominal outcome variable and one or more covariates. The results of MLR are interpreted as relative risk ratios (RRR) and warrant a more coherent interpretation than ordinary logistic regression. Some authors compare the results of MLR to ordinal logistic regression (OLR), irrespective of the fact that these estimate different quantities. We aim to investigate the time trends in the use and misuse of MLR in studies including stroke patients, specifically the extent to which (1) the results are denoted as anything other than RRR, (2) comparisons are made of results with results of OLR and (3) results have been interpreted coherently. Secondarily, we examine the use of model validation techniques in studies with predictive aims. We searched EMBASE and PubMed for articles using MLR on populations of stroke patients. Identified studies were screened, and information pertaining to our aims was extracted. A total of 285 articles were identified through a systematic literature search, and 68 of these were included in the review. Of these, 60 articles (88%) did not denote exponentiated coefficients of MLR as relative risk ratios but rather some other measure. Additionally, 63 articles (93%) interpreted the results of MLR in a non-coherent manner. Two articles attempted to compare MLR results with those of OLR. Nine studies attempted to use MLR for predictive means, and three used relevant validation techniques. From these findings, it is clear that the interpretation of MLR is often suboptimal.
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Affiliation(s)
- Nicholas Fitzhugh
- Danish Center for Health Services Research, Department of Clinical Medicine, Aalborg University, Gistrup, Denmark
- Danish Health Technology Council (Behandlingsrådet), Aalborg, Denmark
| | - Line Ryberg Rasmussen
- Danish Center for Health Services Research, Department of Clinical Medicine, Aalborg University, Gistrup, Denmark
| | - Amalie Helme Simoni
- Danish Center for Health Services Research, Department of Clinical Medicine, Aalborg University, Gistrup, Denmark
| | - Jan Brink Valentin
- Danish Center for Health Services Research, Department of Clinical Medicine, Aalborg University, Gistrup, Denmark
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Zhang Y, Hu J. Effects of low-dose intravenous heparin therapy in aneurysmal subarachnoid hemorrhage: a randomized controlled clinical trial protocol. Trials 2023; 24:447. [PMID: 37422666 DOI: 10.1186/s13063-023-07493-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Accepted: 07/03/2023] [Indexed: 07/10/2023] Open
Abstract
BACKGROUND Heparin anticoagulation therapy is a widely used method to prevent cerebral vasospasm (CV) and venous thrombosis in patients with subarachnoid hemorrhage caused by ruptured cerebral aneurysms. Subcutaneous heparin injection is considered safe and effective, whereas continuous intravenous heparin infusion is still being debated due to the risk of bleeding. Although most retrospective studies have confirmed the safety and effectiveness of unfractionated heparin (UFH) after aneurysm embolization therapy and its ability to reduce CV, there is still no randomized clinical trial comparing UFH and subcutaneous low-molecular-weight heparin (LMWH) injection in this population. Therefore, this study aims to compare the clinical outcomes associated with these two treatment approaches. METHODS The study is an open-label, single-center, randomized controlled trial and aims to recruit 456 patients, with 228 patients in each group. The primary outcome was CV; the second outcomes measures are occurrence of bleeding events, ischemic events, heparin-induced thrombocytopenia, deep vein thrombosis, cerebral venous circulation time, brain edema score, and hydrocephalus incidence. ETHICS AND DISSEMINATION This study protocol obtained ethical approval from the Ethics Committee of Baoan People's Hospital, Shenzhen, Guangdong (approval number: BYL20220805). This work will be published in peer-reviewed international medical journals and presented at medical conferences. TRIAL REGISTRATION ClinicalTrials ID: NCT05696639. Registered on March 30, 2023.
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Affiliation(s)
- Yifan Zhang
- Department of Neurology, ShenZhen BaoAn People's Hospital, ShenZhen, China
| | - Jiangang Hu
- Department of Neurosurgery, ShenZhen BaoAn People's Hospital, ShenZhen, China.
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Rehman S, Phan HT, Chandra RV, Gall S. Is sex a predictor for delayed cerebral ischaemia (DCI) and hydrocephalus after aneurysmal subarachnoid haemorrhage (aSAH)? A systematic review and meta-analysis. Acta Neurochir (Wien) 2023; 165:199-210. [PMID: 36333624 PMCID: PMC9840585 DOI: 10.1007/s00701-022-05399-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 09/19/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVES DCI and hydrocephalus are the most common complications that predict poor outcomes after aSAH. The relationship between sex, DCI and hydrocephalus are not well established; thus, we aimed to examine sex differences in DCI and hydrocephalus following aSAH in a systematic review and meta-analysis. METHODS A systematic search was conducted using the PubMed, Scopus and Medline databases from inception to August 2022 to identify cohort, case control, case series and clinical studies reporting sex and DCI, acute and chronic shunt-dependent hydrocephalus (SDHC). Random-effects meta-analysis was used to pool estimates for available studies. RESULTS There were 56 studies with crude estimates for DCI and meta-analysis showed that women had a greater risk for DCI than men (OR 1.24, 95% CI 1.11-1.39). The meta-analysis for adjusted estimates for 9 studies also showed an association between sex and DCI (OR 1.61, 95% CI 1.27-2.05). For acute hydrocephalus, only 9 studies were included, and meta-analysis of unadjusted estimates showed no association with sex (OR 0.95, 95%CI 0.78-1.16). For SDHC, a meta-analysis of crude estimates from 53 studies showed that women had a somewhat greater risk of developing chronic hydrocephalus compared to men (OR 1.14, 95% CI 0.99-1.31). In meta-analysis for adjusted estimates from 5 studies, no association of sex with SDHC was observed (OR 0.87, 95% CI 0.57-1.33). CONCLUSIONS Female sex is associated with the development of DCI; however, an association between sex and hydrocephalus was not detected. Strategies to target females to reduce the development of DCI may decrease overall morbidity and mortality after aSAH.
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Affiliation(s)
- Sabah Rehman
- Menzies Institute for Medical Research, University of Tasmania, Hobart, TAS, Australia
| | - Hoang T Phan
- Menzies Institute for Medical Research, University of Tasmania, Hobart, TAS, Australia
| | - Ronil V Chandra
- NeuroInterventional Radiology, Monash Health, Melbourne, VIC, Australia
- School of Clinical Sciences at Monash Health, Monash University, Melbourne, VIC, Australia
| | - Seana Gall
- Menzies Institute for Medical Research, University of Tasmania, Hobart, TAS, Australia.
- Monash University, Melbourne, VIC, Australia.
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Doherty RJ, Henry J, Brennan D, Javadpour M. Predictive factors for pre-intervention rebleeding in aneurysmal subarachnoid haemorrhage: a systematic review and meta-analysis. Neurosurg Rev 2022; 46:24. [PMID: 36562905 DOI: 10.1007/s10143-022-01930-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 11/23/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022]
Abstract
Rebleeding before intervention is a devastating complication of aneurysmal subarachnoid haemorrhage (aSAH). It often occurs early and is associated with poor outcomes. We present a systematic review and meta-analysis to identify potential predictors of rebleeding in aSAH. A database search identified studies detailing the occurrence of pre-intervention rebleeding in aSAH, and 809 studies were screened. The association between rebleeding and a variety of demographic, clinical, and radiological factors was examined using random effects meta-analyses. Fifty-six studies totalling 33,268 patients were included. Rebleeding occurred in 3,223/33,268 patients (11.1%, 95%CI 9.4-13), with risk decreasing by approximately 0.2% per year since 1981. Systolic blood pressure (SBP) during admission was higher in patients who rebled compared with those who did not (MD 7.4 mmHg, 95%CI 2.2 - 12.7), with increased risk in cohorts with SBP > 160 mmHg (RR 2.12, 95%CI 1.35-3.34), but not SBP > 140 mmHg. WFNS Grades IV-V (RR 2.05, 95%CI 1.13-3.74) and Hunt-Hess grades III-V (RR 2.12, 95%CI 1.38-3.28) were strongly associated with rebleeding. Fisher grades IV (RR 2.24, 95%CI 1.45-3.49) and III-IV (RR 2.05, 95%CI 1.17-3.6) were also associated with an increased risk. Awareness of potential risk factors for rebleeding is important when assessing patients with aSAH to ensure timely management in high-risk cases. Increased SBP during admission, especially > 160 mmHg, poorer clinical grades, and higher radiological grades are associated with an increased risk. These results may also aid in designing future studies assessing interventions aimed at reducing the risk of rebleeding.
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Affiliation(s)
- Ronan J Doherty
- National Centre for Neurosurgery, Beaumont Hospital, Dublin, Ireland
- Royal College of Surgeons in Ireland, St. Stephen's Green, Dublin, Ireland
| | - Jack Henry
- National Centre for Neurosurgery, Beaumont Hospital, Dublin, Ireland
- Royal College of Surgeons in Ireland, St. Stephen's Green, Dublin, Ireland
| | - David Brennan
- Department of Neuroradiology, Beaumont Hospital, Dublin, Ireland
| | - Mohsen Javadpour
- National Centre for Neurosurgery, Beaumont Hospital, Dublin, Ireland.
- Royal College of Surgeons in Ireland, St. Stephen's Green, Dublin, Ireland.
- School of Medicine, Trinity College Dublin, Dublin, Ireland.
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11
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The effect of sex differences on complications and 90-day outcomes after aneurysmal subarachnoid hemorrhage: a propensity score-matched analysis. Neurosurg Rev 2022; 45:3339-3347. [DOI: 10.1007/s10143-022-01836-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/28/2022] [Accepted: 07/14/2022] [Indexed: 12/21/2022]
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12
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Li R, Chen X, Zhao Y. Potential triggering factors associated with aneurysmal subarachnoid hemorrhage: A large single-center retrospective study. J Clin Hypertens (Greenwich) 2022; 24:861-869. [PMID: 35739460 PMCID: PMC9278573 DOI: 10.1111/jch.14485] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 04/04/2022] [Accepted: 04/05/2022] [Indexed: 11/30/2022]
Abstract
Controlling blood pressure levels is critical to preventing intracranial aneurysm rupture, and a summary review of induced rupture events allows better health education for patients. We retrospectively reviewed all medical records of consecutive patients with aneurysmal subarachnoid hemorrhage (aSAH) admitted to Beijing Tiantan Hospital from 2015 to 2020. We collected patients’ demographic information, aneurysm morphology, blood pressure level on admission, time to onset, and events at the time of aneurysm rupture to analyze the factors precipitating aneurysmal rupture. A total of 764 patients were enrolled for analysis, including 461 (60.3%) female patients and 303 (39.7%) male patients. The mean age of onset in this cohort was 55, and 465 (60.9%) patients had hypertension history. Autumn (245/764 [32.1%]) was the most frequent season for aneurysm rupture, and 07:00–12:59 (277/764 [36.3%]) was the most frequent time frame for aneurysm rupture. The five most prevalent events when aneurysm rupture happened were: (1) daily behaviors that may induce hypertension (181/764 [23.7%]), especially defecation or micturition (116/181 [64.1%]); (2) sporting (162/764 [21.2%]), especially high‐intensity sports (108/162 [66.7%]); (3) mood and mental factors (112/764 [14.7%]), especially arguing or quarreling (61/112 [54.5%]); (4) sudden postural changes (93/764 [12.2%]), especially getting up (69/93 [74.2%]); and (5) sleeping (72/764 [9.4%]). Patients should avoid behaviors that may cause fluctuations in blood pressure, including keeping warm during seasonal alternation, keeping their urine and defecation unobstructed, avoiding high intensity physical exercise, maintaining a happy mood, avoiding sudden postural changes, and should not bathe with too cold or too hot water.
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Affiliation(s)
- Runting Li
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Xiaolin Chen
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,Stroke Center, Beijing Institute for Brain Disorders, Beijing, China.,Beijing Tiantan hospital, Capital Medical University, Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, Beijing, China
| | - Yuanli Zhao
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China.,Department of Neurosurgery, Peking University International Hospital, Beijing, China.,China National Clinical Research Center for Neurological Diseases, Beijing, China.,Stroke Center, Beijing Institute for Brain Disorders, Beijing, China.,Beijing Tiantan hospital, Capital Medical University, Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease, Beijing, China
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13
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Cai Y, Liu Z, Jia C, Zhao J, Chai S, Li Z, Xu C, Zhang T, Ma Y, Ma C, Chen X, Jiang P, Zhao W, Chen J, Xiong N. Comparison of Sex Differences in Outcomes of Patients With Aneurysmal Subarachnoid Hemorrhage: A Single-Center Retrospective Study. Front Neurol 2022; 13:853513. [PMID: 35572942 PMCID: PMC9103686 DOI: 10.3389/fneur.2022.853513] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 03/09/2022] [Indexed: 01/29/2023] Open
Abstract
Background Sex differences in the outcomes of patients with aneurysmal subarachnoid hemorrhage (aSAH) remain controversial. The aim of this study was to evaluate sex differences in the outcomes of patients with aSAH. Method This study retrospectively analyzed the clinical data of consecutive patients with aSAH, admitted to the Department of Neurosurgery, Wuhan University Zhongnan Hospital, from May 1, 2020 to December 31, 2020. The modified Rankin Scale (mRS) score was used to evaluate the prognosis of patients at discharge. Outcome indicators included cerebral ischemia, hydrocephalus, and mRS ≥ 2 at discharge. Results The majority (65%) of the 287 patients with aSAH included in the study were females. Patients were divided into female (n = 184) and male (n = 99) groups; the female patients were significantly older than the male patients (61.3 ± 8.5 years vs. 60.0 ± 8.5 years, p = 0.032). The incidence of comorbidities (hypertension, diabetes, and heart disease) was higher in the female group than in the male group, but the difference was not statistically significant. Although more female patients than male patients underwent endovascular treatment, there was no statistical difference in the treatment approach between the two groups. Comparison of post-operative complications and mRS scores at discharge revealed that the rate of cerebral ischemia and mRS ≥ 2 at discharge were significantly higher among female patients than among male patients. Moreover, this difference persisted after propensity adjustment for age and treatment approach. Analysis of risk factors for poor prognosis at discharge in both pre- and post-adjustment patients revealed cerebral ischemia and high mFisher score (mFisher = 3/4) to be independent risk factors. Conclusion Female patients with aSAH have a worse prognosis than male patients, and this difference may be because women are more susceptible to cerebral ischemia.
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14
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Fréneau M, Baron-Menguy C, Vion AC, Loirand G. Why Are Women Predisposed to Intracranial Aneurysm? Front Cardiovasc Med 2022; 9:815668. [PMID: 35224050 PMCID: PMC8866977 DOI: 10.3389/fcvm.2022.815668] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 01/11/2022] [Indexed: 12/21/2022] Open
Abstract
Intracranial aneurysm (IA) is a frequent and generally asymptomatic cerebrovascular abnormality characterized as a localized dilation and wall thinning of intracranial arteries that preferentially arises at the arterial bifurcations of the circle of Willis. The devastating complication of IA is its rupture, which results in subarachnoid hemorrhage that can lead to severe disability and death. IA affects about 3% of the general population with an average age for detection of rupture around 50 years. IAs, whether ruptured or unruptured, are more common in women than in men by about 60% overall, and more especially after the menopause where the risk is double-compared to men. Although these data support a protective role of estrogen, differences in the location and number of IAs observed in women and men under the age of 50 suggest that other underlying mechanisms participate to the greater IA prevalence in women. The aim of this review is to provide a comprehensive overview of the current data from both clinical and basic research and a synthesis of the proposed mechanisms that may explain why women are more prone to develop IA.
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15
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Buscot MJ, Chandra RV, Mainguard J, Nichols L, Blizzard L, Stirling C, Smith K, Lai L, Asadi H, Froelich J, Reeves MJ, Thani N, Thrift A, Gall S. Association of Onset-to-Treatment Time With Discharge Destination, Mortality, and Complications Among Patients With Aneurysmal Subarachnoid Hemorrhage. JAMA Netw Open 2022; 5:e2144039. [PMID: 35061040 PMCID: PMC8783267 DOI: 10.1001/jamanetworkopen.2021.44039] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
IMPORTANCE Rapid access to specialized care is recommended to improve outcomes after aneurysmal subarachnoid hemorrhage (SAH), but understanding of the optimal onset-to-treatment time for aneurysmal SAH is limited. OBJECTIVE To assess the optimal onset-to-treatment time for aneurysmal SAH that maximized patient outcomes after surgery. DESIGN, SETTING, AND PARTICIPANTS This cohort study assessed 575 retrospectively identified cases of first-ever aneurysmal SAH occurring within the referral networks of 2 major tertiary Australian hospitals from January 1, 2010, to December 31, 2016. Individual factors, prehospital factors, and hospital factors were extracted from the digital medical records of eligible cases. Data analysis was performed from March 1, 2020, to August 31, 2021. EXPOSURES Main exposure was onset-to-treatment time (time between symptom onset and aneurysm surgical treatment in hours) derived from medical records. MAIN OUTCOMES AND MEASURES Clinical characteristics, complications, and discharge destination were extracted from medical records and 12-month survival obtained from data linkage. The associations of onset-to-treatment time (in hours) with (1) discharge destination of survivors (home vs rehabilitation), (2) 12-month survival, and (3) neurologic complications (rebleed, delayed cerebral ischemia, meningitis, seizure, hydrocephalus, and delayed cerebral injury) were investigated using natural cubic splines in multivariable Cox proportional hazards and logistic regression models. RESULTS Of the 575 patients with aneurysmal SAH, 482 patients (mean [SD] age, 55.0 [14.5] years; 337 [69.9%] female) who received endovascular coiling or neurosurgical clipping were studied. A nonlinear association of treatment delay was found with the odds of being discharged home vs rehabilitation (effective df = 3.83 in the generalized additive model, χ2 test P = .002 for the 4-df cubic spline), with a similar nonlinear association remaining significant after adjustment for sex, treatment modality, severity, Charlson Comorbidity Index, history of hypertension, and hospital transfer (likelihood ratio test: df = 3, deviance = 9.57, χ2 test P = .02). Both unadjusted and adjusted cox regression models showed a nonlinear association between time to treatment and 12-month mortality with the lowest hazard of death with receipt of treatment at 12.5 hours after symptom onset, although the nonlinear term became nonsignificant upon adjustment. The odds of being discharged home were higher with treatment before 20 hours after onset, with the probability of being discharged home compared with rehabilitation or other hospital increased by approximately 10% when treatment was received within the first 12.5 hours after symptom onset and increased by an additional 5% from 12.5 to 20 hours. Time to treatment was not associated with any complications. CONCLUSIONS AND RELEVANCE This cohort study found evidence that more favorable outcomes (discharge home and survival at 12 months) were achieved when surgical treatment occurred at approximately 12.5 hours. These findings provide more clarity around optimal timelines of treatment with people with aneurysmal SAH; however, additional studies are needed to confirm the findings.
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Affiliation(s)
- Marie-Jeanne Buscot
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
| | - Ronil V. Chandra
- NeuroInterventional Radiology, Monash Health, Melbourne, Victoria, Australia
- School of Clinical Sciences Monash Health, Monash University, Melbourne, Victoria, Australia
| | - Julian Mainguard
- NeuroInterventional Radiology, Monash Health, Melbourne, Victoria, Australia
| | - Linda Nichols
- School of Nursing, University of Tasmania, Hobart, Tasmania, Australia
| | - Leigh Blizzard
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
| | | | - Karen Smith
- Ambulance Victoria, Melbourne, Victoria, Australia
| | - Leon Lai
- School of Clinical Sciences Monash Health, Monash University, Melbourne, Victoria, Australia
- Department of Neurosurgery, Monash Health, Melbourne, Victoria, Australia
| | - Hamed Asadi
- NeuroInterventional Radiology, Monash Health, Melbourne, Victoria, Australia
| | - Jens Froelich
- NeuroInterventional Radiology, Royal Hobart Hospital, Hobart, Tasmania, Australia
| | - Mathew J. Reeves
- Department of Epidemiology, Michigan State University, East Lansing
| | - Nova Thani
- Department of Neurosurgery, Royal Hobart Hospital, Hobart, Tasmania, Australia
| | - Amanda Thrift
- School of Clinical Sciences Monash Health, Monash University, Melbourne, Victoria, Australia
| | - Seana Gall
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
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16
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Rehman S, Chandra RV, Lai LT, Asadi H, Dubey A, Froelich J, Thani N, Nichols L, Blizzard L, Smith K, Thrift AG, Stirling C, Callisaya M, Breslin M, Reeves MJ, Gall S. Adherence to evidence-based processes of care reduces one-year mortality after aneurysmal subarachnoid hemorrhage (aSAH). J Neurol Sci 2021; 428:117613. [PMID: 34418669 DOI: 10.1016/j.jns.2021.117613] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 08/01/2021] [Accepted: 08/09/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND There is limited research on the provision of evidence-based care and its association with outcomes after aneurysmal subarachnoid hemorrhage (aSAH). AIMS We examined adherence to evidence-based care after aSAH and associations with survival and discharge destination. Also, factors associated with evidence-based care including age, sex, Charlson comorbidity index, severity scores, and delayed cerebral ischemia and infarction were examined for association with survival and discharge destination. METHODS In a retrospective cohort (2010-2016) of all aSAH cases across two comprehensive cerebrovascular centres, we extracted 3 indicators of evidence-based aSAH care from medical records: (1) antihypertensives prior to aneurysm treatment, (2) nimodipine, and (3) aneurysm treatment (coiling/clipping). We defined 'optimal care' as receiving all eligible processes of care. Survival at 1 year was obtained by data linkage. We estimated (1) proportion of patients and characteristics associated with receiving processes of care, (2) associations between processes of care with 1-year mortality using cox-proportional hazard model and discharge destination with log binomial regression adjusting for age, sex, severity of aSAH, delayed cerebral ischemia and/or cerebral infarction and comorbidities. Sensitivity analyses explored effect modification of the association between processes of care and outcome by management type (active versus comfort measures). RESULTS Among 549 patients (69% women), 59% were managed according to the guidelines. Individual indicators were associated with lower 1-year mortality but not discharge destination. Optimal care reduced mortality at 1 year in univariable (HR 0.24 95% CI 0.17-0.35) and multivariable analyses (HR 0.51 95% CI 0.34-0.77) independent of age, sex, severity, comorbidities, and hospital network. CONCLUSION Adherence to processes of care reduced 1-year mortality after aSAH. Many patients with aSAH do not receive evidence-based care and this must be addressed to improve outcomes.
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Affiliation(s)
- Sabah Rehman
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
| | - Ronil V Chandra
- NeuroInterventional Radiology, Monash Health, Clayton, Victoria, Australia; School of Clinical Sciences at Monash Health, Monash University, Clayton, Victoria, Australia
| | - Leon T Lai
- Neurosurgery, Monash Health, Clayton, Victoria, Australia; School of Clinical Sciences at Monash Health, Monash University, Clayton, Victoria, Australia
| | - Hamed Asadi
- NeuroInterventional Radiology, Monash Health, Clayton, Victoria, Australia
| | - Arvind Dubey
- Neurosurgery, Royal Hobart Hospital, Hobart, Tasmania, Australia
| | - Jens Froelich
- NeuroInterventional Radiology, Royal Hobart Hospital, Hobart, Tasmania, Australia
| | - Nova Thani
- Neurosurgery, Royal Hobart Hospital, Hobart, Tasmania, Australia
| | - Linda Nichols
- School of Nursing, University of Tasmania, Hobart, Tasmania, Australia
| | - Leigh Blizzard
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
| | - Karen Smith
- Centre for Research and Evaluation, Ambulance Victoria, Melbourne, Victoria, Australia; Department of Epidemiology and Preventive Medicine, Monash University, Clayton, Victoria, Australia
| | - Amanda G Thrift
- Stroke and Ageing Research, Department of Medicine, School of Clinical Sciences at, Monash Health, Monash University, Clayton, Victoria, Australia
| | | | - Michele Callisaya
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia; Peninsula Clinical School, Monash University, Clayton, Victoria, Australia
| | - Monique Breslin
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
| | - Mathew J Reeves
- Department of Epidemiology, Michigan State University, East Lansing, MI, USA
| | - Seana Gall
- Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia; Monash University, Clayton, Victoria, Australia.
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