An earlier post explored how stroke can rob bladder control. This post looks into what bladder problems stroke can cause. These problems could occur due to the direct damage to the brain areas that control the bladder and bladder gates as well as other impairments such as speech difficulties, movement restrictions, and understanding difficulties.
Table of contents
- Bladder problems due to involvement of the brain areas that control the bladder and the bladder gates
- Urge incontinence
- Increased daytime frequency
- Bladder problems due to other stroke-associated impairments
Post-stroke bladder problems due to the involvement of bladder controlling brain areas
Post-stroke bladder problems due to involvement of the brain areas that regulate the bladder and bladder gates are very common; In the year 2000, a large community-based UK study found 64 percent of those living with a stroke reported one or more bladder problems.
Researchers describe a range of stroke-associated bladder problems; they group these problems into two;
- Storage problems
- Voiding problems
The former group includes urgency, nocturia, increased daytime frequency, and urge incontinence.
The latter group includes hesitancy, decreased stream or dribbling, incomplete emptying (retention), and straining.
Pain and stress incontinence can also co-exist with the above problems.
Of the two groups, storage problems seem to be the most prevalent and problematic. Nataša Bizovičar‘s 2018 review of published research recognizes frequency, urgency, and urge incontinence as predominant bladder problems. Hence, this post focuses more on this group of problems.
The commonly reported storage problems include;
- The urgency with or without the urge incontinence
- Increased daytime frequency,
- Urge incontinence.
The urgency with or without the urge incontinence
The word, urgency, refers to the sudden, compelling desire to pee which is difficult to hold according to the International Continence Society’s glossary.
Research reveals urgency as one of the commonest stroke-associated bladder problems. For example, in 2008 a Denmark hospital-based study found 70 percent of 482 individuals having urgency a month after the stroke event.
How does this urgency to pee arise normally?
An adult normal bladder can hold about 350 – 450 ml of urine. When the bladder is getting filled, its wall becomes stretched. As a result, the nerve network of the web on the wall begins messaging the Pontine center, a place in the lower part of the brain stem (Figure 1). The Pontine center’s job is to send back instructions to start contracting the bladder and release the bladder’s internal gate. However, the center requires permission from its higher centers which are in the brain’s frontal and other lobes. (Figure 1).
Under normal conditions, the higher centers hold granting approval until we find a suitable place and time to pee. However, if the higher centers become dysfunctional, either due to a stroke or any other reason, this regulatory mechanism does not take place resulting in the whole range of bladder problems. As a result, depending on the extent of the brain damage, the following problems may manifest even with the filling of small amounts of urine in the bladder.
Urgency severity scale
As Figure 2 depicts, researchers view the urgency along a severity scale: Mild, moderate, severe, and urge incontinence. However, the urgency is always associated with another two problems: Nocturia and increased daytime frequency.
The Urgency Severity scale
Several screening tools exist to recognize and quantify bladder problems. Of those, a group of Korean researchers has suggested the following four-item tool as a simple and practical one. It appears below. They further suggest incorporating it into a bladder diary.
This scale travels from a “no urgency” state to mild urgency, moderate (tolerable) urgency, severe (intolerable) urgency, and ultimately urge incontinence.
|Score||Severity level||Description |
|0||no feeling of urgency||I can continue all activities until I reach a toileting facility.|
|1||mild feeling of urgency||I feel the urgency but I can hold it until I reach a toileting facility.|
|2||moderate feeling of urgency||The sensation of urgency causes a compelling desire to void; I need to stop my activity and reach a toileting facility.|
|3||severe feeling of urgency||The sensation of urgency causes a compelling desire to void; I have a difficulty in holding urine. I have to stop my activitiy to avoid a wetting accident and hurry to the toileting facility.|
|4||Unable to hold urine||The urine leaks from my bladder; I have a wetting accident before I reach the toileting facility.|
The urge incontinence refers to a situation when the loss of ability to hold until a suitable place and time is met. As mentioned earlier, it could be viewed as the logical result of the urgency spectrum (Figure 1).
Use the following question to determine the presence of urge incontinence.
Other forms of incontinence
However, apart from urge incontinence, incontinence with normal bladder function may also occur. Researchers describe incontinence among individuals with normal bladder functions under the following situations;
- When unable to communicate the need to pee
- Difficulty to comprehend the urgency sensation due to cognitive impairment
- When severely restricted to move due to limb paralysis
Moreover, incontinence can also occur due to the urine retention resulting in an overflow.
According to the International Continence Society’s glossary, nocturia refers to waking up from sleep at night to pee more than once resulting in disturbed sleep.
Some studies reveal straining and pain as related problems too. They may or may not have incontinence.
Increased daytime frequency
Under normal conditions, an adult fills the bladder and hence feels the urge to pee every 3-4 hours depending on the fluid intake. When someone’s number of times to pee exceeds the above frequency, it could be considered as increased daytime frequency.
Overactive bladder (syndrome)
All the above-mentioned bladder problems – urgency, urge incontinence, nocturia, and increased daytime frequency – according to the researchers occur due to overactive bladder wall muscle – detrusor. Collectively, researchers bundle these problems under the term, overactive bladder or overactive bladder syndrome.
The International Continence Society defines the overactive bladder as follows;
“Urinary urgency with or without urge incontinence, and with urinary frequency and nocturia, but in the absence of infection or any other disease”.
The core symptom of the overactive bladder is urgency.
Researchers claim only a third of individuals with overactive bladder have urge incontinence. Some may also have overactive bladder with stress incontinence which arises from a separate mechanism. The stress incontinence arises due to the inability to sustain the extra pressure on the bladder gates. The extra pressure occurs in the forms of coughing, sneezing, or laughing.
How to recognize stress incontinence
Bladder problems due to other stroke-associated impairments
- Peeing problems associated with other impairments that occur due to the stroke
- inability to reach either a toilet or voiding equipment in time
- Speech difficulties
- inability to understand due to a cognitive impairment
- The difficulty of seeing properly