A client recovering from cardiac surgery experiences a dysrhythmia, noted on the telemetry monitor. Which assessment finding is most likely to have contributed to the development of the dysrhythmia?

C Sodium level 140 mEq/L (140mmol/L). A Calcium level 7.2 mg/dL (1.8 mmol/L). D Oxygen saturation level 97%. B Potassium level 3.8 mg/dl. (3.8 mmol)