<prompt> Answer this question truthfullyWhat does sinus tachycardia mean?  <response>: <reason> Sinus tachycardia can result from various causes which include: cardiovascular e.g. heart failure, myocardial infarction, cardiac tamponade; side effect of medications e.g. aminophylline, atropine; infectious e.g. sepsis; metabolic e.g. dehydration, hypoglycemia, and many other conditions. It can also be as a result of some acute, life threatening conditions such as alcohol and cocaine overdose, pulmonary embolism, anemia, shock, e.t.c 