Chapter 34: Urinary Incontinence Assessment

Urinary Incontinence Assessment examines the epidemiology of the condition, noting its high prevalence in older adults and women, and categorizes adult incontinence into five distinct types: stress incontinence, caused by pelvic floor relaxation and increased intraabdominal pressure; urge incontinence (overactive bladder), driven by detrusor muscle hyperactivity or neurologic impairment; overflow incontinence, resulting from bladder overdistention, obstruction, or underactive detrusor muscles; mixed incontinence, which presents with combined symptoms; and reversible or functional incontinence, often associated with medications, mobility issues, or mental status changes. The text delves into the pathophysiology of these conditions, explaining how various medications such as diuretics, anticholinergics, and alpha-adrenergic agonists can precipitate incontinence, and explores organic causes ranging from benign prostatic hypertrophy to neurogenic bladder and spinal cord injuries. Significant focus is placed on pediatric enuresis, distinguishing between primary nonorganic enuresis (where dryness was never achieved) and secondary enuresis (recurrence after a period of dryness), while outlining organic triggers such as urinary tract infections, ectopic ureters, constipation, and pinworms. The chapter details a robust diagnostic reasoning framework, emphasizing a focused history that evaluates fluid intake, voiding frequency, and symptom characteristics, alongside a physical examination that includes abdominal palpation, pelvic and rectal exams to assess sphincter tone and anatomical support, and neurologic assessments for gait and reflexes. Diagnostic studies are thoroughly reviewed, including the use of bladder diaries, urinalysis to rule out infection or diabetes, measurement of postvoid residual (PVR) volume to assess retention, and office cystometrography to evaluate detrusor stability. Finally, the content guides clinicians through differential diagnoses, contrasting anatomical causes like urethral hypermotility with systemic issues like diabetes insipidus or normal pressure hydrocephalus, ensuring a holistic approach to management in primary care settings.