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Romero-Garcia N, Robba C, Monleon B, Ruiz-Zarco A, Ruiz-Pacheco A, Pascual-Gonzalez M, Perdomo F, Garcia-Perez ML, Taccone FS, Badenes R. Neurological outcomes and mortality of hyperoxaemia in patients with acute brain injury: protocol for a systematic review and meta-analysis. BMJ Open 2024; 14:e084849. [PMID: 39019641 PMCID: PMC11256059 DOI: 10.1136/bmjopen-2024-084849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 06/17/2024] [Indexed: 07/19/2024] Open
Abstract
INTRODUCTION Oxygen is frequently prescribed in neurocritical care units. Avoiding hypoxaemia is a key objective in patients with acute brain injury (ABI). However, several studies suggest that hyperoxaemia may also be related to higher mortality and poor neurological outcomes in these patients. The evidence in this direction is still controversial due to the limited number of prospective studies, the lack of a common definition for hyperoxaemia, the heterogeneity in experimental designs and the different causes of ABI. To explore the correlation between hyperoxaemia and poor neurological outcomes and mortality in hospitalised adult patients with ABI, we will conduct a systematic review and meta-analysis of observational studies and RCTs. METHODS AND ANALYSIS The systematic review methods have been defined according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and follow the PRISMA-Protocols structure. Studies published until June 2024 will be identified in the electronic databases MEDLINE, Embase, Scopus, Web of Science, The Cochrane Library, Cumulative Index to Nursing and Allied Health Literature and ClinicalTrials.gov. Retrieved records will be independently screened by four authors working in pairs, and the selected variables will be extracted from studies reporting data on the effect of 'hyperoxaemia' versus 'no hyperoxaemia on neurological outcomes and mortality in hospitalised patients with ABI. We will use covariate-adjusted ORs as outcome measures when reported since they account for potential cofounders and provide a more accurate estimate of the association between hyperoxaemia and outcomes; when not available, we will use univariate ORs. If the study presents the results as relative risks, it will be considered equivalent to the OR as long as the prevalence of the condition is close to 10%. Pooled estimates of both outcomes will be calculated applying random-effects meta-analysis. Interstudy heterogeneity will be assessed using the I2 statistic; risk of bias will be assessed through Risk Of Bias In Non-Randomised Studies of Interventions, Newcastle-Ottawa or RoB2 tools. Depending on data availability, we plan to conduct subgroup analyses by ABI type (traumatic brain injury, postcardiac arrest, subarachnoid haemorrhage, intracerebral haemorrhage and ischaemic stroke), arterial partial pressure of oxygen values, study quality, study time, neurological scores and other selected clinical variables of interest. ETHICS AND DISSEMINATION Specific ethics approval consent is not required as this is a review of previously published anonymised data. Results of the study will be shared with the scientific community via publication in a peer-reviewed journal and presentation at relevant conferences and workshops. It will also be shared key stakeholders, such as national or international health authorities, healthcare professionals and the general population, via scientific outreach journals and research institutes' newsletters.
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Affiliation(s)
- Nekane Romero-Garcia
- Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de València, Valencia, Spain
- Department of Surgery. School of Medicine, University of Valencia, Valencia, Spain
| | - Chiara Robba
- IRCCS Policlinico San Martino, Policlinico San Martino, Genova, Genova, Italy
- Dipartimento di Scienze Chirurgiche diagnostiche e integrate, University of Genoa, Genoa, Italy
| | - Berta Monleon
- Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de València, Valencia, Spain
- Department of Surgery. School of Medicine, University of Valencia, Valencia, Spain
| | - Ana Ruiz-Zarco
- Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de València, Valencia, Spain
| | - Alberto Ruiz-Pacheco
- Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de València, Valencia, Spain
| | - Maria Pascual-Gonzalez
- Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de València, Valencia, Spain
| | - Felipe Perdomo
- Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de València, Valencia, Spain
| | - Maria Luisa Garcia-Perez
- Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de València, Valencia, Spain
- Department of Surgery. School of Medicine, University of Valencia, Valencia, Spain
| | - Fabio Silvio Taccone
- Department of Intensive Care, Hôpital Universitaire de Bruxelles (HUB), Université Libre de Bruxelles (ULB), Bruxelles, Belgium
| | - Rafael Badenes
- Anesthesiology and Surgical-Trauma Intensive Care, Hospital Clinic Universitari de València, Valencia, Spain
- Department of Surgery. School of Medicine, University of Valencia, Valencia, Spain
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Cinotti R, Taran S, Stevens RD. Setting the ventilator in acute brain injury. Intensive Care Med 2024:10.1007/s00134-024-07476-7. [PMID: 38771363 DOI: 10.1007/s00134-024-07476-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/03/2024] [Indexed: 05/22/2024]
Affiliation(s)
- Raphaël Cinotti
- Department of Anaesthesia and Critical Care, CHU Nantes, Nantes Université, Hôtel Dieu, 44000, Nantes, France.
- UMR 1246 SPHERE "Methods in Patients-Centered Outcomes and HEalth Research", University of Nantes, University of Tours, INSERM, IRS2 22 Boulevard Benoni Goulin, 44200, Nantes, France.
| | - Shaurya Taran
- Toronto Western Hospital, University Health Network, Toronto, ON, Canada
- Division of Critical Care Medicine, University of Toronto, Toronto, ON, Canada
| | - Robert D Stevens
- Departments of Anesthesiology and Critical Care Medicine, Biomedical and Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, USA
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Zhao YT, Yuan Y, Tang YG, Zhang SW, Zhou H, Xie ZY. The association between high-oxygen saturation and prognosis for intracerebral hemorrhage. Neurosurg Rev 2024; 47:45. [PMID: 38217753 DOI: 10.1007/s10143-024-02283-6] [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: 10/07/2023] [Revised: 11/30/2023] [Accepted: 01/06/2024] [Indexed: 01/15/2024]
Abstract
BACKGROUND Concerns about the adverse effects of excessive oxygen have grown over the years. This study investigated the relationship between high oxygen saturation and short-term prognosis of patients with spontaneous intracerebral hemorrhage (sICH) after liberal use of oxygen. METHODS This retrospective cohort study collected data from the Medical Information Mart for Intensive Care III (MIMIC-III) database (ICU cohort) and a tertiary stroke center (general ward cohort). The data on pulse oximetry-derived oxygen saturation (SpO2) during the first 24 h in ICU and general wards were respectively extracted. RESULTS Overall, 1117 and 372 patients were included in the ICU and general ward cohort, respectively. Among the patients from the ICU cohort, a spoon-shaped association was observed between minimum SpO2 and the risk of in-hospital mortality (non-linear P<0.0001). In comparison with minimum SpO2 of 93-97%, the minimum SpO2>97% was associated with a significantly higher risk of in-hospital mortality after adjustment for confounders. Sensitivity analysis conducted using propensity score matching did not change this significance. The same spoon-shaped association between minimum SpO2 and the risk of in-hospital mortality was also detected for the general ward cohort. In comparison with the group with 95-97% SpO2, the group with SpO2>97% showed a stronger association with, but non-significant risk for, in-hospital mortality after adjustment for confounders. The time-weighted average SpO2>97% was associated significantly with in-hospital mortality in both cohorts. CONCLUSION Higher SpO2 (especially a minimum SpO2>97%) was unrewarding after liberal use of oxygen among patients with sICH and might even be potentially detrimental.
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Affiliation(s)
- Yu-Tong Zhao
- Department of Neurosurgery, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 76 Linjiang Road, Chongqing, 400010, China
| | - Ye Yuan
- Department of Neurosurgery, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 76 Linjiang Road, Chongqing, 400010, China
| | - Yu-Guang Tang
- Department of Neurosurgery, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 76 Linjiang Road, Chongqing, 400010, China
| | - Shu-Wei Zhang
- Department of Intensive Care Unit, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400010, China
| | - Hai Zhou
- Department of Neurosurgery, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 76 Linjiang Road, Chongqing, 400010, China
| | - Zong-Yi Xie
- Department of Neurosurgery, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 76 Linjiang Road, Chongqing, 400010, China.
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