Which statement correctly differentiates overflow incontinence from detrusor underactivity?

Which statement correctly differentiates overflow incontinence from detrusor underactivity?

• A. Overflow leakage occurs with impaired detrusor contraction; detrusor underactivity involves obstruction
• B. Overflow leakage is due to incomplete emptying from obstruction or poor detrusor contraction, while detrusor underactivity involves insufficient detrusor contraction with retention and minimal leakage
• C. Both conditions present with significant urge to void
• D. They are identical conditions

Answer: (B)

The key idea is distinguishing the mechanism behind leakage in these two conditions. Overflow incontinence happens when the bladder can’t empty properly, so urine gradually overfills and leaks. This can be due to an outlet obstruction or a detrusor that isn’t contracting well enough to empty the bladder. Detrusor underactivity, by contrast, means the detrusor muscle itself isn’t contracting strongly or long enough to empty the bladder, leading to retention with little leakage unless the bladder becomes overfull. So, the best description is that overflow leakage arises from incomplete emptying caused by obstruction or poor detrusor contraction, while detrusor underactivity involves insufficient detrusor contraction with retention and minimal leakage.

The key idea is distinguishing the mechanism behind leakage in these two conditions. Overflow incontinence happens when the bladder can’t empty properly, so urine gradually overfills and leaks. This can be due to an outlet obstruction or a detrusor that isn’t contracting well enough to empty the bladder. Detrusor underactivity, by contrast, means the detrusor muscle itself isn’t contracting strongly or long enough to empty the bladder, leading to retention with little leakage unless the bladder becomes overfull.

So, the best description is that overflow leakage arises from incomplete emptying caused by obstruction or poor detrusor contraction, while detrusor underactivity involves insufficient detrusor contraction with retention and minimal leakage.