EXPRESS: Normal Saline Versus Balanced Intravenous Fluids in Acute Ischemic Stroke: A Retrospective Study.

Abstract

Background While some studies have suggested better outcomes for critically ill patients with balanced solutions over normal saline, the best type of intravenous fluid to use for stroke patients remains unknown.Objective To determine if balanced solutions or normal saline are associated with risk of hemorrhagic transformation or 90-day disability in patients with acute ischemic stroke treated with intravenous thrombolysis.Methods This was a retrospective review of the 2015-2019 Get with the Guidelines® data at a single academic medical center. Exposure was type of intravenous fluid and outcomes were modified Rankin scale (mRS) ≤2 at 90 days and hemorrhagic transformation. Multivariate analysis controlled for age, demographics, medical history, time to tPA, and admission stroke scale.Results We included 302 patients who received thrombolysis, of which 166 patients had mRS data at 90 days. In univariate analysis, exposure to any balanced solution was associated with increased 90-day disability (OR 4.3, 95% CI 3.8-4.9) and hemorrhagic transformation (OR 2.0, 95% CI 1.3-2.2). In multivariate analysis, exposure to a balanced solution at any time was associated with increased 90-day disability (OR 6.3, 95% CI 2.4-17.0, p<0.01), but not hemorrhagic transformation.Conclusion This observational trial demonstrated that exposure to balanced solutions is associated with increased risk of disability at 90 days and possibly hemorrhagic transformation in patients with acute ischemic stroke treated with intravenous thrombolysis. This data would suggest that normal saline is a preferred solution in these patients, though larger future trials are needed.