A 60-year-old female patient was admitted due to sudden onset of impaired movement in the right limb. Past medical history includes diabetes mellitus (DM) and atrial fibrillation. Examination findings: The patient cannot express herself but can understand others; blood pressure (BP) is normal, cardiopulmonary examination is unremarkable, she is conscious and cooperative but unable to speak. Right nasolabial fold is shallow, forehead wrinkles are symmetrical, tongue protrusion deviates to the right, right limb muscle strength is grade 3, and right pathological signs are positive. The patient's speech impairment is classified as: