Problem: A 55-year-old male presents with fatigue, dizziness, and black, tarry stools. His blood pressure is 90/60 mmHg, and heart rate is 110 bpm. Which of the following is the most immediate concern? Need Assignment Help? Hypovolemic shock from upper GI bleeding Acute myocardial infarction Chronic anemia from lower GI bleeding Pulmonary embolism