0 T and 50 msec at 1.5 T) was used to measure T2* signal changes (Delta R2*) in the fetal brain in control conditions and during hypoxia (maternal oxygenation, 50%-70%). A carotid catheter JQEZ5 mw was placed and maintained in the fetuses to enable measurement of the fetal arterial oxygen saturation (SaO(2)). Delta R2* was correlated with fetal SaO(2), and linear regression analysis was performed. A paired t test was
used to evaluate differences, with a significance level of P < .05.
Results: At both field strengths, a signal intensity decrease on T2*-weighted images during hypoxia was detected. At 1.5 T, mean fetal SaO(2) was reduced from 65.4% +/- 9.2 (standard deviation) during control conditions to 17.7% +/- 6.2 during hypoxia. Delta R2* and fetal SaO(2) correlated significantly (r = 0.98, P = .018). At 3.0 T, fetal SaO(2) click here was reduced from 62.4% +/- 7.5 during control conditions to 18% +/- 7.5 during hypoxia. Delta R2* and fetal SaO(2) also correlated significantly (r = 0.95, P = .012). A linear fit resulted in a slope value of 0.084 +/- 0.003 for 1.5 T and 0.166 +/- 0.016 for 3.0 T. This means a doubled sensitivity of Delta R2* for oxygen saturation variations at 3.0 T compared with 1.5 T.
Conclusion: MR imaging at 3.0 T is more sensitive than that at 1.5 T in the detection of Delta R2* in the fetal brain during hypoxia.
However, there was a signal decrease in the fetal brain in all 1.5-T experiments during hypoxia. Thus it is possible to measure fetal Delta R2* at 1.5 T, which may be of more practical relevance for the evaluation of pregnant women. (C) RSNA, 2009″
“In this era of SB273005 research buy highly active antiretroviral therapy (ART), body habitus changes among HIV-infected patients, including face and peripheral lipoatrophy, visceral abdomen fat accumulation, together with lipid and glucose metabolism abnormalities, have been widely described under the name of lipodystrophy.
Lipodystrophy contributes to cardiovascular disease risk in HIV infection through a complex interplay of host, virus and ART factors. Given that both HIV and ART are independent risk factors for cardiovascular disease, aggressive preventive care should be considered in all infected patients. The time has come to proceed beyond lipodystrophy studies based on blood concentrations of lipids and glucose and body fat evaluation. Surrogate markers of organ disease associated with lipodystrophy identify patients vulnerable to cardiovascular events better than statistical risk algorithms. Management of lipodystrophy needs to be considered as being part of a multidisciplinary approach focusing on the reduction of cardiovascular diseases. For now, the mainstays of cardiovascular disease prevention for HIV-infected persons at high risk include, appropriate lifestyle changes, use of lipid-lowering and anti-aggregant medications and judicious selection of highly active ART agents.