The state Senate unanimously approved a bill on Thursday that would limit staffing in hospital intensive care units, a day after the bill received unanimous support in the House. As the Boston Business Journal reported earlier today, it was expected the Senate would approve the bill. The bill will soon head to Gov. Deval Patrick, who is expected to support the measure. The bill says that a nurse cannot be assigned more than one patient in an intensive care unit setting, and in certain circumstances, no more than two patients.