ABSTRACT
Objective:To study the risk factors, cerebral hemodynamics and clinical outcomes of extremely and very preterm infants with severe intraventricular hemorrhage (IVH).Methods:From January 2019 to December 2019, premature infants with gestational age (GA) <32 w admitted to our hospital were assigned into severe IVH group and non-severe IVH group. Risk factors for severe IVH were analyzed. According to clinical outcomes, severe IVH group was further assigned into improvement subgroup and no-improvement subgroup. Cerebral hemodynamic parameters were compared between the two groups.Results:A total of 346 eligible neonates were enrolled in this study. The incidence of severe IVH was 11.0% (38 cases). The incidences of Grade Ⅲ and Ⅳ IVH were 8.7% (30/346) and 2.3% (8/346), respectively. Multivariate logistic regression analysis showed that CA < 28 w ( OR=4.365, 95% CI 1.055~18.054), 5 min Apgar score ≤7 ( OR=8.749, 95% CI 2.214~36.042), chorioamnionitis ( OR=3.245, 95% CI 1.127～9.344), PaCO 2 fluctuation within 1 h >25 mmHg ( OR=7.728, 95% CI 1.738~80.907) and vasoactive drugs usage ( OR=10.883, 95% CI 3.746~31.621) were the risk factors of severe IVH. 20 cases in severe IVH group were improved at discharge and 12 cases showed no improvement at discharge. Improvement subgroup showed quicker reduction of the middle cerebral artery flow resistance and faster recovery of the mean flow velocity than the no-improvement subgroup. Conclusions:GA <28 w, 5 min Apgar score ≤7, chorioamnionitis, PaCO 2 fluctuation within 1 h >25 mmHg and vasoactive drugs usage are risk factors of severe IVH in extremely and very preterm infants. Cerebral hemodynamic monitoring may provide initial assessment for the clinical outcomes for severe IVH.
ABSTRACT
Objective To explore the relationship between blood lipid levels and cerebrovascular hemodynamic indices (CVHI) in a young and middle?aged population, and to identify reference values for early warning of stroke. Method Between June 2015 and June 2016, a total of 6 252 young and middle?aged patients were assessed for cerebrovascular function in The Health Management Center of Affiliated Hospital of Guizhou Medical University. Patients were divided into abnormal and normal blood lipid groups. Differences in CVHI indicators and scores between the groups were determined, and factors influencing CVHI indices were compared using multivariate logistic regression analysis. Results Mean (Vmean), maximum (Vmax), and minimum blood flow velocity (Vmin) and cumulative scores for CVHI indices in the abnormal blood lipid group were significantly lower than in the normal blood lipid group (P<0.001). However, pulse wave velocity, characteristic impedance, peripheral vascular resistance, dynamic resistance, critical pressure, and differences between diastolic blood pressure and critical pressure were greater than those in the normal blood lipid group (P<0.001). Multivariate logistic regression analysis indicated that a high triglyceride level, overweight or obesity, high systolic blood pressure, high diastolic blood pressure, and age were risk factors for low CVHI scores, with odds ratios (95% confidence intervals) of 1.455 (1.195- 1.771), 2.271 (1.782-2.895), 5.967 (4.557-7.815), 4.251 (3.349-5.396), 2.560 (1.993-3.287), and 1.448 (1.189-1.763). Conclusion Abnormal blood lipid levels can lead to abnormal cerebrovascular function in young and middle?aged population; elevated triglyceride level was an independent risk factor for impaired cerebrovascular function.