What vital sign change is most concerning in a patient being treated for a suspected pulmonary embolism?

In a patient being treated for a suspected pulmonary embolism, a significant decrease in blood pressure is particularly concerning due to the potential for cardiovascular compromise. Pulmonary embolism can lead to decreased blood flow to the lungs, resulting in impaired oxygenation and increased strain on the heart. When a patient experiences a drop in blood pressure, it can indicate that the heart is unable to maintain adequate circulation, which may suggest a serious deterioration of the patient's condition. This drop in blood pressure could lead to shock, requiring immediate intervention to restore hemodynamic stability.

Other vital sign changes can also be important indicators in this scenario. An increased heart rate might indicate the body's compensatory response to maintain cardiac output in the setting of reduced blood flow or oxygenation. An elevated temperature could suggest an inflammatory response, while a decreased respiratory rate might not be as significant in the context of a pulmonary embolism. Therefore, while these other vital signs are relevant, a decreased blood pressure stands out as the most urgent change requiring attention, as it directly reflects the heart's ability to effectively perfuse the body and maintain vital organ function.