Final answer:
The first step in the management of a patient with mixed urinary incontinence is to perform a thorough history and physical examination.
Step-by-step explanation:
The first step in the management of a patient with mixed urinary incontinence is to perform a thorough history and physical examination. This is important to gather information about the patient's symptoms, medical history, and lifestyle factors that may be contributing to the incontinence. It also helps to assess the severity and type of incontinence present, which is crucial for developing an appropriate treatment plan.