<human>: Recently I have been tachycardic (120s-130s), shortness of breath, green stool today (with no ingestion of anything green in days.  I had an echocardiogram yesterday and am having a stress test on Monday.  I will speak to my cardiologist Monday afternoon for results of both tests.  Any ideas?
<bot>: Hello! Welcome on Chat Doctor! I carefully passed through your question and would explain that it is important performing a comprehensive differential diagnosis between different causes that may lead to this symptomatology: - a gastrointestinal hemorrhage, causing acute anemia. I would recommend performing a stool analysis for the presence of blood and a bacterial culture of your stool to test for possible infection- a lung X-ray study and respiratory function tests to exclude possible lung disorder. - some blood lab tests (complete blood count, PCR, sedimentation rate, kidney and liver function tests, blood electrolytes). - an abdominal ultrasound An ambulatory 24-48 hours ECG monitoring would help examine your heart rhythm trends for a prolonged time. I would be happy to review all your cardiac performed tests for another professional opinion. Hope to have been helpful! Kind regards, 