In surgery, when something goes wrong, minutes become hours. Minutes are the focus of a lawsuit filed by the family of a 29-year-old Seymour nurse who died in February 2015 after undergoing minor elective sinus surgery at the North Haven Surgery Center. The suit alleges that the center waited as long as 29 minutes to call an ambulance after Katherine O’Donnell’s blood pressure and pulse fell to critical levels on the operating table – and that doctors continued to proceed with surgery, even as their efforts to resuscitate her failed. The case raises questions about how well equipped freestanding surgical centers are to handle emergencies, and what sanctions they face for alleged lapses in care. The lawsuit alleges that the center and Fairfield Anesthesia Associates, LLC, which handled anesthesia in the case, failed to properly respond by stopping the surgery immediately and calling a “Code Blue” emergency when O’Donnell’s blood pressure and oxygen levels plummeted.