The manufacturer of a component of the hemodialysis treatment known as GranuFlo, investigated over 900 reports of cardiac arrest during or immediately following treatment. According to an internal study by the manufacturer, Fresenius, at least 914 patients suffered sudden cardiac arrest in Fresenius clinics in 2010 alone. Alkalosis, too much sodium bicarbonate in the blood is one explanation for the high rate of dialysis patients have suffered cardiac arrest in recent years. That electrolyte imbalance makes patients six to eight times more likely to suffer cardiac arrest.