A 68-year-old woman presents with light-headedness, nausea, and chest discomfort. Your assessment finds her awake and responsive but appearing ill, pale, and grossly diaphoretic. Her radial pulse is weak, thready, and fast. You are unable to obtain a blood pressure. She has no obvious dependent edema, and her neck veins are flat. Her lung sounds are equal, with moderate rales present bilaterally. The cardiac monitor shows the rhythm seen here.
