A 22-year-old woman presents to the emergency room with an 8-hour history of high fever, vomiting, diarrhea, and night sweats. Her temperature on admission is 38.7degC (103degF), blood pressure 100/60 mm Hg, and respirations 24 per minute. She has a diffuse desquamative erythematous rash. Upon pelvic examination, the patient is found to be menstruating, and a tampon is in place. A purulent exudate is found within the vagina, which is cultured and grows Staphylococcus aureus. The hemoglobin is 12 g/dL, and the platelet count is 40,000/mL. Which of the following represents the most common life-threatening complication of this patient's systemic disorder?