Cardiovascular Systems, Inc. provided preliminary and unaudited revenue guidance for the fiscal second quarter ended December 31, 2018. For the quarter, the company revenues are expected to be $60.2 million, an increase of $7.6 million, or 14.4%, from the second quarter of fiscal 2018. For the year to date, revenues in a range of $243 million to $247 million, an increase of 12% to 14% compared to fiscal 2018.