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1 software over a time interval (t1 to t2) to quantify the amount of energy produced during each trial, measured in mm?Hg. The equation for EEP is as follows: Surplus hemodynamic energy (SHE) and total hemodynamic energy (THE) were also calculated. SHE is the difference between EEP and MAP, found using the equation below: THE is equivalent to EEP and is calculated using the following equation: The units for SHE and THE are ergs/cm3. The constant 1332 converts pressure from units of mm?Hg to dynes/cm2 (1?mm?Hg?=?1332?dynes/cm2; 1 dyne/cm2?=?1?erg/cm3). The pressure drops across the oxygenator, cannula, and total circuit were calculated using the following equations, where p is the pressure at the location denoted by the subscript description: Analysis of variance (ANOVA) models were fit to the continuous outcomes (e.g., pressure drops and percentage energy losses) to compare flow rate (200, 400, 600, 800?mL/min) and mode https://www.selleck.cn/products/PLX-4720.html (nonpulsatile and pulsatile). A linear mixed-effects model was fit to the continuous outcomes (e.g., MAP, EEP, SHE, and THE) to compare the flow rate, mode, and location (e.g., preoxygenator, precannula, and postcannula) [14]. The linear mixed-effects model is an extension of linear regression that accounts for the within-subject variability inherent in repeated-measures designs. In this study, the repeated factor is the location. For https://www.selleckchem.com/products/avelestat-azd9668.html each outcome, P values were adjusted for multiple comparisons testing using the Tukey�CKramer procedure. All hypothesis tests were two-sided, and all analyses were performed using SAS software, version 9.3 (SAS Institute, Cary, NC, USA). During this experiment, the observed rotational speed of the Deltastream DP3 pump was recorded in nonpulsatile mode at each flow rate. When the pump was switched to pulsatile mode, the rotational speed increased from the nonpulsatile mode observation, even though no other adjustments were made to the pump or circuit. In order to ensure consistency of data measurements, the rotational speed in pulsatile mode was adjusted to match the rotational speed in nonpulsatile mode. This resulted in average observed flow rates that varied by less than 1% across all trials (Table?1). Pulsatile mode produced higher observed flow rates at the same rotational speed differential in all https://www.selleckchem.com/products/a-1331852.html groups except the 800?mL/min group. Additionally, there was no backflow noted in pulsatile mode at any of the flow rates. Figure?2 presents flow waveforms at 400?mL/min and 800?mL/min in both pulsatile and nonpulsatile modes. In both nonpulsatile and pulsatile modes, MAP increased as the flow rate increased. Additionally, MAP in pulsatile mode was significantly higher than in nonpulsatile mode (P?