The use of small cannulae improves surgical field visualization in minimally invasive cardiac surgery, but may compromise the venous drainage. Vacuum assisted venous drainage is a simple and nonexpensive solution to this problem. We report our clinical experience using a device consisting of a negative pressure regulator, a vacuum line filter and an electronic manometer. The safety and efficacy of this CPB system was first tested in vitro, applying a negative pressure of 250 mmHg to the venous blood reservoir of a membrane oxigenator, at 40°C. Such a system was used in 11 patients who underwent CABG through standard sternotomy. Later, 9 patients underwenf aortic valve surgery (5 patients) or ASD closure (4 patients) through partial sternotomy ("J" incision), using this system. This device allowed the use of 24 to 28 Fr cannulae, using negative pressure of 40 to 70 mmHg, with adequate arterial flow, venous drainage and no evidence of hemolysis.
Myocardial revascularization; Drainage; Vacuum; Catheters; Oxigenators
