 One group of patients received 100 milligrams of Coenzyme Q10 per day for 14 days prior to the surgery and for 30 days following the surgery.The other group of patients received a placebo for the same periods.Patients in both groups had a documented blood Coenzyme Q10 deficiency (< 0.6 micrograms per milliliter), low cardiac index (< 2.4 l/m2 per minute), and low left ventricular ejection fraction (< 35%) prior to the Coenzyme Q10 treatment.