A 55-year-old woman entered the emergency room by ambulance. Her primary complaint is chest pain. She is receiving O2 via nasal cannula at 2 L/min for dyspnea. Which of the following findings in the client's nursing assessment demand immediate nursing action?

Indigestion or nausea may accompany angina or myocardial infarction, but they do not indicate imminent danger for the client. Restlessness and apprehensiveness require immediate nursing action because they are indicative of very low oxygenation of body tissues and are frequently the first indication of impending cardiac or respiratory arrest. It is common for the cardiac client to experience fatigue and inability to physically tolerate long assessment sessions. A history of hypertension requires no immediate nursing intervention. In the situation described, the blood pressure is not given and therefore cannot be assumed to be elevated.