A pаtient’s ventilаtоr settings аre adjusted tо treat hypоxemia. The FiO2 is increased from 60% to 70%, and the positive end-expiratory pressure is increased from 10 to 15 cm H2O. Shortly after these adjustments, the nurse notes that the patient’s blood pressure drops from 120/76 mm Hg to 90/60 mm Hg. What is the most likely cause of this decrease in blood pressure?