Review Question - QID 216248

A 48-year-old woman, gravida 3 para 3, presents to the clinic with a 5-month history of intermittent loss of urine. Her urinary leaking occurs throughout the day and night, and she often has to get up to use the bathroom while asleep. Exercising does not affect the loss of urine. She states that she often cannot make it to the bathroom in time once she senses a need to void. Her last menstrual period was 2 weeks ago. Her urinalysis is unremarkable, and her postvoid residual volume is 40 mL. On pelvic examination, there is no dribbling of urine when the patient coughs. Physical exam is otherwise unremarkable. Which of the following is the most likely diagnosis?