In an overcrowded environment like the OR , biplane systems add to the complexity .
In an overcrowded environment like the OR , biplane systems interfere with anesthesia , except for neurosurgery , where anesthesia is not at the head end .
In an overcrowded environment like the OR , biplane systems add to the complexity and interfere with anesthesia , except for neurosurgery , where anesthesia is not at the head end .