P suffered a severe adverse reaction to anesthesia she received during surgery. P died. P sued the Ds alleging malpractice. P alleged that D had committed malpractice by failing to 'pre-oxygenate' P. The trial court granted D's' motion in limine to prevent P from cross-examining D's medical expert, Dr. Caplan, about whether he, personally, would have pre- oxygenated P. The jury found in favor of D and P appealed. The Court of Appeals affirmed, and this appeal resulted.