Abstract
Background
Following aneurysmal subarachnoid hemorrhage (SAH), patients are monitored closely for vasospasm in the intensive care unit. Conditional vasospasm-free survival describes the risk of future vasospasm as a function of time elapsed without vasospasm. Conditional survival has not been applied to this clinical scenario but could improve patient counseling and intensive care unit use. The objective of this study was to characterize conditional vasospasm-free survival following SAH.
Methods
This was a single institution, retrospective cohort study of patients treated for aneurysmal SAH between 1/1/2000–6/1/2020. The primary outcome was the development of vasospasm defined by the first instance of either radiographic vasospasm on computed tomography angiography, Lindegaard Index > 3.0 by transcranial doppler ultrasonography, or vasospasm-specific intraarterial therapy. Multivariable Cox regression was performed, and conditional vasospasm-free survival curves were constructed.
Results
A total of 528 patients were treated for aneurysmal SAH and 309 (58.5%) developed vasospasm. Conditional survival curves suggest patients who survive to postbleed day 10 without vasospasm have a nearly 90% chance of being discharged without vasospasm. The median onset of vasospasm was postbleed day 6. Age more than 50 years was associated with a lower risk (hazard ratio [HR] = .76; 95% confidence interval [CI] 0.64–0.91; p < 0.001). Higher initial systolic blood pressure (HR = 1.18; 95% CI 1.046–1.350; p = .008), Hunt-Hess grades 4 or 5 (HR = 1.304; 95% CI 1.014–1.676), and modified Fisher scale score of 4 (HR = 1.808; 95% CI 1.198–2.728) were associated with higher vasospasm than the respective lower grades.
Conclusion
Conditional survival provides a useful framework for counseling patients and making decisions around vasospasm risk for patients with aneurysmal SAH, while risk factor-stratified plots facilitate a patient-centric, evidence-based approach to these conversations and decisions.
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Funding
REDCap, used for study data management, is supported by NCATS/National Institutes of Health grant UL1 TR000445. One author (PDK) is supported by a training grant from the National Cancer Institute of the National Institutes of Health under award number T32CA106183.
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PDK: design of the work, analysis and interpretation of data, and drafting the work. AMYK: design of the work, analysis and interpretation of data, and drafting the work. ART: acquisition of data and critically revising the intellectual content. SVJ: acquisition of data and critically revising the intellectual content. RAR: acquisition and interpretation of data and critically revising the intellectual content. FY: analysis and interpretation of data and critically revising the intellectual content. ZZ: analysis and interpretation of data and critically revising the intellectual content. MTF: conception and design of the work, interpretation of the data, and critically revising the content. MRF: conception and design of the work, interpretation of the data, and critically revising the content. All authors approve of the final manuscript.
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Kelly, P.D., Yengo-Kahn, A.M., Tang, A.R. et al. Conditional Vasospasm-Free Survival Following Aneurysmal Subarachnoid Hemorrhage. Neurocrit Care 37, 81–90 (2022). https://doi.org/10.1007/s12028-022-01444-z
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DOI: https://doi.org/10.1007/s12028-022-01444-z