Laparoscopic cholecystectomy (LC) can be performed using low intra-abdominal pressure (<12 mmHg), but surgical conditions may not be optimal. The present study aimed at comparing surgical space conditions using either deep, continuous muscle relaxation or moderate blockade during low-pressure (8 mmHg) LC. We hypothesized that a deep neuromuscular block would be associated with a higher proportion of optimal surgical space conditions.