The prognostic value of serum uric acid in the acute phase of hemorrhagic stroke patients in black Africans

Prognostic Significance of Uric Acid Levels in Intracerebral Hemorrhage Patients

Background and Purpose

The role of serum uric acid (UA) level in patients suffering from stroke remains controversial. Our aim was to investigate the effect of UA level on clinical outcomes in patients with intracerebral hemorrhage (ICH).

Methods

In the retrospective cohort study, we analyzed data from 250 patients with intracerebral hemorrhage (85 women and 165 men) to investigate the difference in UA levels between patients with a good prognosis and those with a poor prognosis. Additionally, we analyzed the impact of UA levels on the risk of short-time prognosis of ICH patients.

Results

Patients with a good prognosis presented with significantly lower levels of UA (348.71 ± 84.97 μmol/L) than those with poor prognosis (393.06 ± 148.46 μmol/L). Furthermore, multivariate logistic regression model demonstrated that a high UA level was a likely risk factor for worse prognosis among patients suffering in ICH (odds ratio [95% confidence interval], 1.006 [1.0012, 1.0108]; P = 0.015). Additionally, UA has a threshold effect value of 363.9 μmol/L and was presented in levels that were in a nonlinear relationship with incidence rate of short-time prognosis outcome of ICH patients.

Conclusion

Our findings indicate that higher UA levels can increase the risk of poor clinical prognosis in patients with ICH and high UA levels are not conductive to the clinical prognosis of patients with ICH. These findings provide a new perspective on the treatment and prevention of ICH.

Uric Acid and Clinical Outcomes Among Intracerebral Hemorrhage Patients: Results From the China Stroke Center Alliance

Background and Purpose: The effect of uric acid (UA) levels on severity and prognosis of spontaneous intracerebral hemorrhage (ICH) remains controversial. We aimed to explore the association of admission UA levels with stroke severity and outcomes in ICH patients.

Materials and Methods: The patients enrolled in this study were from the China Stroke Center Alliance study (CSCA). Patients were divided into four groups (Q1–Q4) according to the quartiles of UA levels at admission. The primary outcome was in-hospital mortality. The secondary outcomes included stroke severity, in-hospital complications, and discharge disposition. Multivariate logistic regression was adopted to explore the association of UA levels with outcomes after ICH.

Results: Patients (84,304) with acute ICH were included in the final analysis; the median (interquartile range) of UA was 277 (210, 354) μmol/L. The four groups were defined as follows: Q1 ≤ 210 μmol/L, 210 μmol/L < Q2 ≤ 277 μmol/L, 277 μmol/L < Q3 ≤ 354 μmol/L, Q4 > 354 μmol/L. There was no significant evidence indicating that UA levels were correlated with the discharge disposition and in-hospital mortality after ICH. However, compared to Q1, the patients with higher UA levels had decreased odds of severe stroke (NIHSS ≥ 16) at admission (OR 0.89, 95% CI 0.86–0.92). An L-shaped association was found between UA and severe stroke. Among in-hospital complications, decrease in pneumonia, poor swallow function, gastrointestinal bleeding, and deep vein thrombosis (DVT) were significantly associated with higher UA levels compared to Q1 (P for trend < 0.0001).

Conclusions: UA was a protective factor for stroke severity and in-hospital complications such as pneumonia, poor swallow function, gastrointestinal bleeding, and DVT. However, no significant evidence indicated that UA levels were predictive of the discharge disposition and in-hospital mortality after ICH.

The association between serum uric acid levels and ischemic stroke in essential hypertension patients

Objectives: The association between serum uric acid (SUA) and ischemic stroke is still inconsistent across population. This study aimed to examine the association between SUA and ischemic stroke in essential hypertension patients. Methods: This retrospective study recruited participants from September 2011 to December 2012, in the Liao-bu community, Guangdong Province, China, and followed them until 31 December 2016. Participants were divided into quartiles based on SUA concentrations. Hazard ratio (HR) and confidence intervals (CIs) was estimated from Cox proportional hazards models, and propensity score analysis, Kaplan-Meier survival curves and receiver operating characteristic (ROC) curve were performed to evaluate the relationship between SUA and the risk of ischemic stroke. Results: A total of 5473 eligible hypertensive subjects were enrolled in this study, 2666 (48.71%) of them were males with an average age of 62.02 ± 13.76 years. A total of 155 (2.83%) ischemic stroke occurred after the mean follow-up period of 4.5 years. After adjusting for potential confounders, comparing with the lowest quartiles of SUA, multivariable HR (95%CI) for ischemic stroke for participants with SUA at the second, third and fourth quartiles were 1.13 (95%CI: 1.10, 1.81), 1.39 (95%CI: 1.18, 1.89), and 1.64 (95%CI: 1.19, 1.95), respectively (P < 0.0001 for trend). Elevated SUA was positively associated with ischemic stroke (HR = 1.41, 95%CI: 1.16, 1.84; P < 0.01) and the propensity scores analysis (HR = 1.45, 95%CI: 1.17, 1.90; P < 0.01) showed the similar results. Gender subgroup analysis showed SUA was an independent risk of ischemic stroke in female (HR = 1.35, 95%CI: 1.11, 1.81, P = 0.002) and male (HR = 1.53, 95%CI: 1.14, 1.92, P < 0.001). ROC curve demonstrated that SUA yielded an AUC of 0.7476 (95%CI: 0.7098, 0.7855, P < 0.001) for predictive of ischemic stroke. Conclusions: SUA was an independent risk factor for ischemic stroke, and also have a good predictive value ischemic stroke among hypertensive patients in Chinese community.