003),
and left atrial area (p = 0.014). In conclusion, plasma inflammatory markers are not associated with sinus non-conversion by radiofrequency maze procedure.”
“Introduction: Parameters of ventricular repolarization variability are increasingly being used in an attempt to understand better and predict the occurrence of ventricular tachycardia. Nevertheless, some of the measures used hove thus far not been analyzed regarding gender differences in a large group of healthy subjects. Furthermore, new parameters might give further insight.
Methods and Results: We investigated 139 healthy volunteers (mean age 41.6 +/- 15.3 years, range 20-77, median 40.0 years, 76 women) without evidence of organic cardiac disease. Mean RR interval and established buy ATM Kinase Inhibitor time domain parameters of heart rate variability (rMSSD; SDNN) were measured for each subject. Beat-to-beat QT interval and time-domain QT interval variability
were analyzed. Characteristics of the QT interval and QT interval variability were determined as hourly mean values. The standard deviation of all QT intervals/hour (SDQT) and the standard deviation of all QTc intervals/hour (SDQTc) were used to measure QT interval variability. Four novel ratios of repolarization inhomogeneity (VRI: SDQT/SDNN; VR II: SDQT/rMSSD; VB III: SDQTc/SDNN, VR IV: SDQTc/rMSSD) were introduced. Female subjects exhibited CBL0137 purchase significantly higher values in all four ratios of variability.
Conclusion: The obvious gender differences in EX527 repolarization inhomogeneity found in this study might be valuable in better understanding differences between men and women in the genesis of ventricular tachycardia. (PACE 2009; 32:S167-S172)”
“Nonlocal elasticity theory is a growing technique for the mechanical analyses of microelectromechanical (MEMS) and nanoelectromechanical (NEMS) based structures.
The nonlocal parameter accounts for the small size effects when dealing with nanosize structures such as single-walled carbon nanotubes (SWCNTs). In this article, nonlocal elasticity and Timoshenko beam theory are implemented to study the vibration response of SWCNT embedded in an elastic medium. Influence of the surrounding elastic medium on the fundamental frequencies of the SWCNT is investigated. Both Winkler-type and Pasternak-type foundation models are employed to simulate the interaction of the SWCNT with the surrounding elastic medium. A differential quadrature approach is being utilized and numerical solutions for the natural frequencies are obtained. Influences of nonlocal effects, Winkler modulus parameter, Pasternak shear modulus parameter, and aspect ratio on the frequency of SWCNT are analyzed and discussed. The present study illustrates that the frequencies of embedded SWCNT are significantly dependent on the nonlocal parameter and on the stiffness of the surrounding elastic medium. (c) 2009 American Institute of Physics. [DOI: 10.1063/1.
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