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 38-year-old woman comes to the physician because of a 1-month history of progressively worsening dyspnea, cough, and hoarseness of voice. Her pulse is 92/min and irregularly irregular, respirations are 20/min, and blood pressure is 110/75 mm Hg. Cardiac examination shows a rumbling mid-diastolic murmur that is best heard at the apex in the left lateral decubitus position. Which of the following is the most likely underlying cause of this patient's condition?
assistant
Antibody cross-reactivity