Fowler urethral sphincter dysfunction syndrome

Fowler syndrome, also known as Fowler urethral sphincter dysfunction syndrome, is a rare condition primarily affecting young women, characterized by urinary retention due to a failure of the external urethral sphincter to relax during voiding. The condition was first described by Professor Clare Fowler and typically presents in premenopausal women, often in their 20s and 30s. The underlying mechanism involves abnormal electromyographic (EMG) activity in the striated muscle of the urethral sphincter, which demonstrates a characteristic pattern of complex repetitive discharges and decelerating bursts. This abnormal sphincter activity results in an elevated urethral closure pressure that prevents normal bladder emptying, leading to painless urinary retention with large residual volumes. The primary body system affected is the lower urinary tract, specifically the external urethral sphincter and bladder function. Patients typically present with an inability to void or incomplete bladder emptying, often with bladder volumes exceeding one liter at the time of diagnosis. The condition is frequently associated with polycystic ovaries, suggesting a possible hormonal component in its pathogenesis. Some patients may also experience associated symptoms such as constipation or other pelvic floor dysfunction. Management of Fowler syndrome centers on sacral neuromodulation (also known as sacral nerve stimulation), which has been shown to be an effective treatment for restoring voiding function in many affected women. This involves the implantation of a device that delivers electrical stimulation to the sacral nerve roots, particularly S3, which helps to modulate the abnormal sphincter activity and restore the voiding reflex. Prior to the availability of sacral neuromodulation, patients were typically managed with clean intermittent self-catheterization. Conventional treatments for urinary retention, such as alpha-blockers, are generally ineffective in this condition.

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