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Table 1 Evolution of ventriculo-arterial coupling and left ventricular mechanical efficiency during different experimental stages

From: Determinants of left ventricular ejection fraction and a novel method to improve its assessment of myocardial contractility

  VAC (a.u.) LV efficiency (%)
  Before After Before After
Afterload
 Phenylephrine 2.06 ± 0.51 2.36 ± 0.51* 61 ± 9 55 ± 10*
 Nitroprusside 2.00 ± 0.49 1.42 ± 0.44 61 ± 10 72 ± 11
Preload
 Bleeding 2.02 ± 0.61 1.57 ± 0.51* 58 ± 11 67 ± 11
 Fluid bolus 1.72 ± 0.63 2.06 ± 0.73* 65 ± 12 57 ± 12*
Contractility
 Esmolol 1.50 ± 0.36 2.43 ± 0.61 68 ± 7 47 ± 3
 Dobutamine 1.71 ± 0.47 1.14 ± 0.34 65 ± 7 75 ± 1
  1. Data are presented as mean ± SD
  2. A.u. arbitrary units, VAC ventriculo-arterial coupling, LVeff left ventricular mechanical efficiency
  3. *p < 0.05, p ≤ 0.001 ,p ≤ 0.0001 versus “before” stage