Since its inception in the early 1980s, laparoscopy has become a widely accepted surgical approach. Smaller incisions impart several clinical benefits such as improved cosmesis, decreased pain, and an earlier return to preoperative activities.1,2 Laparoscopy, however, requires the establishment of pneumoperitoneum, which alters certain physiologic functions. We will review the physiologic effects of pneumoperitoneum (Fig. 1).