A patient with a history of diastolic heart failure is admit…

A patient with a history of diastolic heart failure is admitted to the emergency department with severe dyspnea. The patient has pitting edema in the ankles, a blood pressure of 110/60 mm Hg, an apical pulse rate of 95, a respiratory rate of 30, and SpO2 of 90%. The most important assessment for the nurse to accomplish next is: