scholarly journals Logistic Characterization of Left Ventricular Isovolumic Pressure-Time Curve.

1995 ◽  
Vol 45 (3) ◽  
pp. 535-552 ◽  
Author(s):  
Hiromi MATSUBARA ◽  
Junichi ARAKI ◽  
Miyako TAKAKI ◽  
Sachiko T. NAKAGAWA ◽  
Hiroyuki SUGA
Keyword(s):  
Left Ventricular ◽  
Time Curve ◽  
Pressure Time

scholarly journals Temperature-dependent inotropic and lusitropic indices based on half-logistic time constants for four segmental phases in isovolumic left ventricular pressure–time curve in excised, cross-circulated canine heart

2017 ◽  
Vol 95 (2) ◽  
pp. 190-198 ◽  
Author(s):  
Ju Mizuno ◽  
Satoshi Mohri ◽  
Takeshi Yokoyama ◽  
Mikiya Otsuji ◽  
Hideko Arita ◽  
...  
Keyword(s):  
Least Squares Method ◽  
Left Ventricular Pressure ◽  
Left Ventricular ◽  
Canine Heart ◽  
Temperature Dependent ◽  
Time Curve ◽  
Time Constants ◽  
Pressure Time ◽  
Systolic And Diastolic Function ◽  
Increasing Temperature

Varying temperature affects cardiac systolic and diastolic function and the left ventricular (LV) pressure–time curve (PTC) waveform that includes information about LV inotropism and lusitropism. Our proposed half-logistic (h-L) time constants obtained by fitting using h-L functions for four segmental phases (Phases I–IV) in the isovolumic LV PTC are more useful indices for estimating LV inotropism and lusitropism during contraction and relaxation periods than the mono-exponential (m-E) time constants at normal temperature. In this study, we investigated whether the superiority of the goodness of h-L fits remained even at hypothermia and hyperthermia. Phases I–IV in the isovolumic LV PTCs in eight excised, cross-circulated canine hearts at 33, 36, and 38 °C were analyzed using h-L and m-E functions and the least-squares method. The h-L and m-E time constants for Phases I–IV significantly shortened with increasing temperature. Curve fitting using h-L functions was significantly better than that using m-E functions for Phases I–IV at all temperatures. Therefore, the superiority of the goodness of h-L fit vs. m-E fit remained at all temperatures. As LV inotropic and lusitropic indices, temperature-dependent h-L time constants could be more useful than m-E time constants for Phases I–IV.

Application of Electrochemical Techniques to Characterization of the Corrosion Behaviors of GW63 Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 571-574
Author(s):  
Xing Wu Guo ◽  
Jian Wei Chang ◽  
Shang Ming He ◽  
Peng Huai Fu ◽  
Wen Jiang Ding
Keyword(s):  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Open Circuit ◽  
Cyclic Polarization ◽  
Time Curve ◽  
Completely Monotonic ◽  
Treatment Conditions ◽  
Impedance Variation ◽  
Corrosion Behaviors

The corrosion behavior of GW63 (Mg-6wt.%Gd-3wt.%Y-0.4wt.%Zr) alloys in 5% NaCl aqueous solution has been investigated by PARSTAT 2273 instrument. The Open Circuit Potential (ECORR) vs. time curve, cyclic polarization (Pitting Scans) curve and Electrochemical Impedance Spectroscopy (EIS) was measured for the GW63 alloys in as-cast and T6 heat treatment conditions. The EIS results indicated that the tendency of impedance variation for as-cast condition was monotonic decreasing, however, the tendency of variation for T6 condition was not completely monotonic but the total tendency was decreasing. The values of impedance of GW63 alloy at 0.1 Hz are about 103 ohm-cm2 for as-cast and T6 condition.

Stereological characterization of left ventricular cardiomyocytes, capillaries, and innervation in the nondiabetic, obese mouse

2012 ◽  
Vol 21 (4) ◽  
pp. 346-354 ◽  
Author(s):  
Carina Gruber ◽  
Karin Kohlstedt ◽  
Annemarieke E. Loot ◽  
Ingrid Fleming ◽  
Wolfgang Kummer ◽  
...  
Keyword(s):  
Left Ventricular ◽  
Obese Mouse ◽  
Ventricular Cardiomyocytes
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