Detrusor overactivity vs impaired contractility: which statement is true?

• A. Involuntary contractions during filling
• B. Absence of contractions during filling with urge
• C. Contractions only during voiding
• D. No change in detrusor pressure during filling

Answer: (A)

The main idea here is how the detrusor behaves during bladder filling versus emptying. Detrusor overactivity means the bladder muscle makes involuntary contractions while you are still filling, which produces urgency and can lead to leakage before you reach the bathroom. This pattern—involuntary contractions during the filling phase—best matches the statement that is true. In contrast, impaired detrusor contractility refers to weak or absent contractions during voiding, causing poor emptying, not unusual activity during filling. The other statements describe scenarios that don’t fit detrusor overactivity: no contractions during filling with an urge would imply a mismatch between sensation and action, contractions only during voiding don’t reflect the common filling-phase contractions of DO, and no change in detrusor pressure during filling describes normal storage rather than involuntary activity.