By reducing intrathoracic and transmural pressures during systole and diastole, CPAP reduces left ventricular afterload, and by reducing venous return and left and right ventricular end-diastolic volumes, it also decreases preload [ 54].
LVAD, withdrawing the blood from the left ventricular apex and returning the blood to the ascending aorta, can establish physiological perfusion and reduce left ventricular volume, whereas peripheral PCPS perfuses aorta retrogradely, increases left ventricular afterload, and might induce left ventricular distension.
In patients with COPD but without cardiac disease, weaning was associated with a significant reduction in left ventricle ejection fraction and this reduction was probably due to increased left ventricular afterload [ 30].
However, the downside of ECMO for cardiac support is that because of the retrograde aortic flow, left ventricular afterload and oxygen demand increase without the placement of a left ventricular drain.
Potential causes of acute pulmonary congestion during weaning in patients with diastolic left ventricular dysfunction include the weaning-induced increases in venous return and left ventricular afterload, hypoxia, and tachycardia [ 23].
Left ventricular afterload is defined as the pressure of the wall in the left ventricle during ejection.
Left ventricular afterload.
During hyperoxia, left ventricular afterload clearly increased.
Note that restoration of a "normal" left ventricular afterload has unmasked impaired contractility.
Thus, Ea should be considered as an index reflecting SV rather than left ventricular afterload in critically ill patients.
Widely used for ischemic cardiogenic shock, intra-aortic counterpulsation reduces cardiac work by reducing left ventricular afterload and improves tissue perfusion and diastolic coronary perfusion.
