MRCP2-2740
A 68-year-old woman was admitted to the hospital with a tender, hot, right calf. She had a history of congestive cardiac failure and chronic edema of her left leg. The admitting doctor considered deep vein thrombosis or cellulitis as possible diagnoses and started the patient on low molecular weight heparin while scheduling a Doppler ultrasound scan of the affected leg.
During the night, the nursing staff requested a review of the patient by the senior house officer, as they felt that she was unwell. Upon examination, the SHO noted that the patient was confused, had a fever of 39.0°C, a blood pressure of 85/60 mmHg, a pulse of 120 beats per minute and regular, and a respiratory rate of 32 breaths per minute. The area of erythema on the right lower leg had extended to the mid-thigh.
Given the patient’s acute illness, which of the following is the appropriate course of action?