The patient in this scenario presents with chest pain, dyspnea, agitation, tachypnea, tachycardia, and hypotension. These symptoms are highly suggestive of a pulmonary embolism. A pulmonary embolism occurs when a blood clot travels to the lungs and blocks blood flow. This can lead to decreased oxygenation, causing chest pain and dyspnea. The increased heart rate and respiratory rate are the body's compensatory mechanisms to try to improve oxygenation. Hypotension can occur due to decreased cardiac output. While MI, heart failure, and hypokalemia can cause similar symptoms, the combination of signs and symptoms in this case is most consistent with a pulmonary embolism.