Cardiothoracic and Vascular Anesthesia
Influence of Low Tidal Volume Ventilation on Time to Extubation in Cardiac Surgical Patients
Sundar S, Novack V, Jervis K, et al (Beth Israel Deaconess Med Ctr, Boston, MA; et al) Anesthesiology 114:1102-1110, 2011§
Low tidal volumes have been associated with improved outcomes in patients with established acute lung injury. The role of low tidal volume ventilation in patients without lung injury is still unresolved. We hypothesized that such a strategy in patients undergoing elective surgery would reduce ventilator-associated lung injury and that this improvement would lead to a shortened time to extubation.
A single-center randomized controlled trial was undertaken in 149 patients undergoing elective cardiac surgery. Ventilation with 6 versus 10 ml/kg tidal volume was compared. Ventilator settings were applied immediately after anesthesia induction and continued throughout surgery and the subsequent intensive care unit stay. The primary endpoint of the study was time to extubation. Secondary endpoints included the proportion of patients extubated at 6 h and indices of lung mechanics and gas exchange as well as patient clinical outcomes.
Median ventilation time was not significantly different in the low tidal volume group; a median (interquartile range) of 450 (264–1,044) min was achieved compared with 643 (417–1,032) min in the control group (P = 0.10). However, a higher proportion of patients in the low tidal volume group was free of any ventilation at 6 h: 37.3% compared with 20.3% in the control group (P = 0.02). In addition, fewer patients in the low tidal volume group required reintubation (1.3 vs. 9.5%; P = 0.03).