[Hemodynamic changes during pneumoperitoneum in volume and pressure controlled ventilated dogs.].

BACKGROUND AND OBJECTIVES There are no studies associating ventilation-induced effects and hemodynamic changes during pneumoperitoneum. This study aimed at evaluating hemodynamic changes determined by pneumoperitoneum in dogs under volume and pressure controlled ventilation. METHODS The study involved 16 dogs anesthetized with sodium thiopental and fentanyl, divided in group 1: volume controlled; and group 2: pressure controlled; submitted to 10 and 15 mmHg pneumoperitoneum. The following parameters were evaluated: heart rate, mean blood pressure, right atrium pressure, pulmonary capillary wedge pressure, cardiac index, systemic vascular resistance index and plasma vasopressin. Data were collected in four moments: M1 - before pneumoperitoneum, M2 - 30 minutes after 10 mmHg pneumoperitoneum; M3 - 30 minutes after 15 mmHg pneumoperitoneum; M4 - 30 minutes after pneumoperitoneum deflation. RESULTS Results have shown increased cardiac index, right atrium pressure and pulmonary capillary wedge pressure in M2 and M3 for all groups. Vasopressin was not changed during procedure and systemic vascular resistance index has not increased, providing mean blood pressure stability for both groups. CONCLUSIONS Ventilation modes have not determined hemodynamic differences between studied groups. Anesthetic technique and intra-abdominal pressure have determined mean blood pressure stability, probably due to the absence of systemic vascular resistance index increase.