Aortic acceleration as a noninvasive index of left ventricular contractility in the mouse.

Aortic acceleration as a noninvasive index of left ventricular contractility in the mouse.
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DOI:
10.1038/s41598-020-79866-y
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发表时间:
2021-01-12
期刊:
影响因子:
4.6
通讯作者:
Reddy AK
Reddy AK
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Perez JET;Ortiz-Urbina J;Heredia CP;Pham TT;Madala S;Hartley CJ;Entman ML;Taffet GE;Reddy AK

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经侵入性测量的左心室(LV)压力一阶导数的最大值(+ dp/dtmax或P‘)常被用来量化LV收缩能力,这在小鼠中仅限于单一的终末期研究。因此,在小鼠纵向/连续研究中确定P‘需要在每个期望的时间点上对一组小鼠进行测量,从而产生“伪”连续测量。或者,P‘的非侵入性替代物将允许在同一组小鼠上重复测量,从而将生理变异性降至最低,并需要更少的动物。在这项研究中,我们评估了主动脉加速度和其他主动脉血流速度参数作为小鼠左室收缩能力的无创性指标。我们同时使用血管内压导管和脉冲多普勒探头无创测量小鼠的左室压和主动脉血流速度,在基线和注射正性肌力阻滞剂多巴酚丁胺后。P‘与主动脉峰值速度(Vp)、峰值速度平方/上升时间(Vp2/T)、峰值(+ dvp/dt或v’p)和平均(+ dvm/dt或v‘m)的相关系数高(P’与Vp,R2 = 为0.77;Vp2/T,R2 = 为0.86;v‘p,R2 = 为0.80;v’m,R2 = 为0.89)。结果提示,平均或峰值升主动脉加速度或其他参数可作为评价左心室收缩功能的无创性指标。
The maximum value of the first derivative of the invasively measured left ventricular (LV) pressure (+ dP/dtmax or P′) is often used to quantify LV contractility, which in mice is limited to a single terminal study. Thus, determination of P′ in mouse longitudinal/serial studies requires a group of mice at each desired time point resulting in “pseudo” serial measurements. Alternatively, a noninvasive surrogate for P′ will allow for repeated measurements on the same group of mice, thereby minimizing physiological variability and requiring fewer animals. In this study we evaluated aortic acceleration and other parameters of aortic flow velocity as noninvasive indices of LV contractility in mice. We simultaneously measured LV pressure invasively with an intravascular pressure catheter and aortic flow velocity noninvasively with a pulsed Doppler probe in mice, at baseline and after the administration of the positive inotrope, dobutamine. Regression analysis of P′ versus peak aortic velocity (vp), peak velocity squared/rise time (vp2/T), peak (+ dvp/dt or v′p) and mean (+ dvm/dt or v′m) aortic acceleration showed a high degree of association (P′ versus: vp, r2 = 0.77; vp2/T, r2 = 0.86; v′p, r2 = 0.80; and v′m, r2 = 0.89). The results suggest that mean or peak aortic acceleration or the other parameters may be used as a noninvasive index of LV contractility.
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