![]() To what extent such atelectasis remains or develops regularly after CPB is not clear. Recently, the same group found that the increase in venous admixture is caused by “true shunt” and very little by perfusion of poorly ventilated lung regions, as assessed by multiple inert gas elimination. found a 26.4% incidence of shunt in 11 patients with respiratory dysfunction in the early postoperative period, and this was well correlated with atelectasis as seen on CT scanning. If this is so, it may contribute to the high incidence of intrapulmonary shunting, and sometimes severe hypoxemia, that is frequently seen in persons having cardiac surgery. It may be assumed that atelectasis also can be found after cardiac surgery, especially as the lungs are often open to the atmosphere under cardiopulmonary bypass, which facilitates lung collapse. Using computed tomography (CT), researchers found that general anesthesia induces atelectasis in nearly all patients, and this is correlated to intrapulmonary shunt. Alveolar collapse also has been proposed as an important cause of postoperative respiratory dysfunction. ![]()
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