What condition should an EMT suspect in an obese patient with sudden dyspnea, tachycardia, and low oxygen saturation despite supplemental oxygen?

In this scenario, the symptoms of sudden dyspnea (difficulty breathing), tachycardia (rapid heart rate), and low oxygen saturation despite receiving supplemental oxygen align well with a pulmonary embolism. A pulmonary embolism occurs when a blood clot travels to the lungs, leading to blockage of the pulmonary arteries. This condition can cause acute respiratory distress, which can manifest suddenly and severely, especially in individuals who have risk factors such as obesity.

Obese patients are at an increased risk for developing blood clots due to factors such as restricted mobility and increased venous stasis. The rapid onset of dyspnea and the insufficient response to supplemental oxygen suggest that the lungs are not effectively exchanging gases due to the obstruction caused by the embolus. This is a critical situation that often requires immediate intervention to restore adequate blood flow and oxygenation.

While congestive heart failure, pneumonia, and asthma exacerbation can also result in respiratory distress and low oxygen saturation, these conditions typically present with additional signs or symptoms over a longer period of time. For instance, congestive heart failure often involves fluid retention and a history of heart issues, pneumonia usually presents with fever and productive cough, and asthma exacerbation may involve wheezing and a known history of asthma. The acute