“…Specifically, mechanical ventilation, gastric distension, barium meal, suction applied to chest drainage tubes or aspiration of the hemithorax, coughing on extubation, hyperinflation of the remaining lung, and changes in patient position may facilitate dislocation of the heart through a defect. [8][9][10] Clinical features of cardiac herniation include a sudden onset of low cardiac output and superior vena cava syndrome. These symptoms may be accompanied by severe hypotension, bradycardia or tachycardia, normal or slightly elevated central venous pressure, and sometimes, cardiac arrest.…”