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Figure 1 | Critical Care

Figure 1

From: Prediction of fluid challenge effect: filling pressure when left ventricular function is abnormal, diastolic volume when left ventricular function is normal

Figure 1

Simplification of the right and left stroke volume variations during mechanical ventilation. (a) During insufflation, the right ventricular afterload increases with venous return impairment leading to a reduced stroke volume (SV). Simultaneously, lung squeezing pushes blood towards the left ventricle, creating a better left ventricular preload and then a better SV. As a consequence, the pulmonary blood volume decreases. (b) During exsufflation, the right ventricle works with a reduced afterload and a better preload, ejecting a higher SV. In addition, the lung is engorged according to pulmonary vessel compliance, storing blood and reducing preload of the left ventricle and its SV. As a consequence, the pulmonary blood volume increases. Globally, insufflation reduces the pulmonary blood volume when exsufflation is increasing it. MV, mechanical ventilation.

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Critical Care

ISSN: 1364-8535