Lactate Dehydrogenase Predicts Hemorrhagic Transformation in Patients with Acute Ischemic Stroke

Introduction: Hemorrhagic transformation (HT) is a severe but frequent complication of acute ischemic stroke (AIS). This study aimed to evaluate the relationship between serum LDH levels and HT. Methods: We retrospectively included 542 AIS patients with HT and 1091 age and gender-matched patients without HT. Demographic and clinical data were obtained from medical records, and blood samples were obtained within 24 hours after admission. The characteristics of groups were compared. With the receiver operating characteristic curve (ROC) analysis, we assessed the discriminating capacity of LDH levels in predicting HT in patients with AIS. The logistic regression model was used to determine the connection between LDH and HT. Results: The HT group had considerably higher LDH levels than the non-HT group [263.0 (216.0-323.3) U/L vs. 178.0 (162.0-195.0) U/L, P < 0.001]. We also observed that the levels of LDH in the parenchymal hemorrhage (PH) subgroup were significantly higher than those in the hemorrhagic infarction (HI) subgroup [281.0 (230.0-340.0) U/L vs. 258.0 (209.0-311.0) U/L, P < 0.001]. The area under the ROC curve (AUC) of LDH was 0.890 (95% CI 0.874-0.905, P < 0.001). Besides, logistic regression revealed that high LDH levels (LDH > 215 U/L) showed a higher risk of HT [odds ratio (OR) = 10.958, 95% confidence level (CI) 7.964-15.078, P < 0.001]. Conclusion: High LDH levels were linked with an increased risk of HT in AIS patients. Practical measures should be considered in patients with increased LDH levels (LDH > 215 U/L).