Red blood cell distribution width in different time-points of peripheral thrombolysis period in acute ischemic stroke is associated with prognosis

The relationship between red blood cell distribution width (RDW) in peripheral thrombolysis period and prognosis is not fully clarified in those who underwent intravenous thrombolysis (IVT) for acute ischemic stroke (AIS). Our study aimed to clarify this issue. A retrospective analysis of about 510 consecutive thrombolysis cases for AIS from January 2015 to March 2019 in a single-center database was done and followed-up for 3 months. We used univariate and multivariable models to evaluate the relationship between RDW levels at various time-points after IVT and the occurrence risk of hemorrhagic transformation (HT) and recurrent stroke, and used COX regression to assess the hazard ratios of outcomes with RDW levels. Elevated risk of HT was found in higher tertiles of RDW (OR = 10.282, 95% confidence interval (CI) 2.841-39.209, P < 0.001 in Tp tertile G3; OR = 5.650, 95% CI 1.992-16.025, P = 0.001 in T24 tertile G3; OR = 4.308, 95% CI 1.480-12.542, P = 0.007 in T48 tertile G3 and OR = 6.384, 95% CI 2.201-18.515, P = 0.001 in T72 tertile G3, respectively). Occurrence of recurrent stroke was highest in the RDW tertile G3 (HR = 4.580, 95% CI 2.123-9.883, P < 0.001 in Tp tertile G3; HR = 5.731, 95% CI 2.498-13.151, P = 0.001 in T24 tertile G3; HR = 3.019, 95% CI 1.969-4.059, P = 0.031 in T48 tertile G3; HR = 3.318, 95% CI 1.598-6.890, P = 0.001 in T72 tertile G3, respectively). Mean RDW levels >= 13.60 among AIS patients undergoing thrombolysis was associated with higher risk of HT and recurrent stroke.