The nurse is caring for a client with a bowel obstruction. The client has a nasogastric tube in place set to low intermittent suctioning (LIS). The nurse notes an output of 750 mL during the first half of the shift. The nurse reviews the client’s lab values and notes a pH of 7.48, CO2 of 35 mEq/L, and HCO3 of 28 mEq/L. Which of the following conditions does the nurse suspect?