system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 54-year-old woman comes to the emergency department because of two episodes of bright red blood per rectum within the past day. She has a history of migraine, which is treated prophylactically with verapamil. She appears well and is hemodynamically stable. Cardiac exam reveals a regular heart rate without any murmurs or gallops. Lungs are clear to auscultation. Her abdomen is mildly tender without rebound or guarding. Digital rectal examination shows fresh blood on the glove. Laboratory studies show:
Hemoglobin 10.4 g/dL
Leukocyte count 5,000/mm3
Platelet count 175,000/mm3
Partial thromboplastin time 35 seconds
Serum
Na+ 140 mEq/L
K+ 3.7 mEq/L
Cl- 101 mEq/L
HCO3- 25 mEq/L
Mg2+ 1.8 mEq/L
A routine ECG shows a heart rate of 75/min, a normal axis, PR interval of 280 ms, QRS interval of 80 ms with a QRS complex following each p wave, and no evidence of ischemic changes. Which of the following is the most appropriate next step in management with respect to this patient's cardiovascular workup?"
assistant
Observation