Thousands of nurses plan to hold a one-day strike on Thursday over contract disputes between the California nurses’ union and two health care organizations. About 4,000 nurses employed by Sutter Health, based in the San Francisco area, will walk off the job at eight hospitals unless a deal is reached. Around 2,000 nurses from a Long Beach hospital system also plan to strike. More than 23,000 California nurses staged a one-day strike in September. The nurses were locked out at Sutter hospitals after the strike, and one patient died when a replacement nurse administered an incorrect dosage of medicine. Sutter plans to bring in replacement nurses on Thursday and Friday. A Sutter spokeswoman said care would not be compromised.