A client presents with chest pain, shortness of breath, and a recent history of diarrhea. Upon assessment, the nurse notes an irregular heart rhythm and low potassium levels in the lab results. What is the most appropriate nursing action to take next?

Assess the client's vital signs and reassess heart rhythm before taking further action

Document findings for future reference and take no immediate action

Administer potassium without consulting the healthcare provider

Initiate oxygen therapy immediately without further assessment