Question: Example: A patient presents generally unwell, lightheaded and feels like their heart is beating fast, not an unusual call for any paramedic. On exam the patient has a pulse of 130-150 BPM, sinus tach to match on the monitor and BP is 100-110 systolic. Would it not be safe to assume that the BP is being maintained by the HR?

The question: Could this patient not benefit from a one time fluid bolus/challenge of 250ml to see if it decreases the HR decreasing cardiac demand and maintain the BP thus being beneficial for the patients overall condition? I realize that the IV and fluid therapy directive is for a BP less that 90 Systolic and is to ensure that a patient has an adequate perfusion or actual/potential need for medication, however would this not fall under the fluid therapy part of the IV and fluid therapy directive?