Syncope - What Is the Most Ominous Rhythm in Medicine, Robbie?

Most causes of syncope aren't benign. They're not malignant. The ones that you really have to watch out for is the heart, like cardiac primary. A patient with sinus tachycardia and relative hypotension may need volume resuscitation. But even if the heart rate responds, Robbie, you haven't ruled out an autonomic process. It's good for ruling it in, but not ruling it out.