Compared with neat PBS, the incorporation of MWCNTs into the matrix led to higher complex viscosities (|eta*|), storage modulus (G’), loss modulus (G ”), shear thinning behaviors, and lower damping factor (tan delta) at low frequency range, and shifted the PBS/MWCNT composites from liquid-like to solid-like, which affected the crystallization behaviors and thermal stabilities of PBS. The presence of a very small quantity
of MWCNTs had a significant heterogeneous-nucleation effect SYN-117 on the crystallization of PBS, resulting in the enhancement of crystallization temperature, i.e., with the addition of 0.5 wt % MWCNTs, the values of T-c of PBS/MWCNT composites could attain to 90 degrees C, about 6 degrees C higher than that of neat PBS, whereas the values of Tc increased slightly with further increasing the MWCNTs content. The thermogravimetric analysis illustrated that the thermal stability of PBS was improved with the addition of MWCNTs compared with that of neat PBS. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 59-67, 2011″
“Background: Sudden death (SD) and non-sudden cardiac death are responsible for the majority
of deaths in patients with heart failure. We sought to identify the influence of comorbid illness (Charlson Comorbidity BAY 80-6946 datasheet Index [CCI]) on competing modes of death in heart failure.
Methods: A retrospective analysis of 824 patients followed in a tertiary care heart failure clinic was performed. We analyzed the cumulative incidence of sudden and nonsudden death. Competing
risk regression was used to examine the association between medical comorbidities and mode of death. The outcomes of interest were overall mortality, SD, SD and/or appropriate implantable cardioverter-defibrillator therapy (ICD), and non-SD.
Results: Mean age of the study population Q-VD-Oph solubility dmso was 64.1 +/- 14.7 years, 68.6% were male, and mean ejection fraction was 32.8% +/- 13.5%. Over a mean follow-up of 4.4 years, 229 patients (27.8%) died. SD accounted for 33 deaths (14.4%), whereas SD/appropriate ICD therapy occurred in 56 patients (24.5%). The risk of non-SD and total mortality increased (P < .0001) as the CCI increased, whereas the risk of SD decreased (P = .03). The cumulative incidence of SD, SD and/or ventricular tachycardia/fibrillation, and non-SD at 5 years was 5.6%, 9.1%, and 27.8%, respectively. In multivariate competing risk analysis, advancing age, New York Heart Association class, and a CCI > 4 were significantly associated with non-SD.
Conclusion: Patients with heart failure with significant comorbidities are much more likely to sustain non-SD. These findings may have implications in optimal selection of patients with heart failure for interventions such as prophylactic ICD therapy.”