Bladder Considerations with Spinal Cord Injury

Original Editor - Wendy Oelofse

Top Contributors - Ewa Jaraczewska, Jess Bell and Kim Jackson  

Introduction

The bladder becomes neurogenic when it no longer receives an input from the brain to empty or store urine. This interruption in communication can occur after a spinal cord injury (SCI) as the brain is not able to send or receive signals to and from the organs below the level of injury. Urologic complications can be severe and life threatening. This article supplies additional information on managing bladder dysfunction after spinal cord injury for the Plus course: Bladder and Bowel Considerations with Spinal Cord Injury.

Bladder Dysfunction in Spinal Cord Injury

The location of the spinal cord lesion defines bladder dysfunction.

Spastic Bladder

• Observed in people with a spinal cord injury above T12 (upper motor neuron SCI)
• Limited/no ability to feel bladder fullness
• Limited/no control of the sphincter muscle to hold urine
• Spastic/overactive bladder causing involuntary reflex voiding and incontinence – the voiding reflex is intact between the spinal cord and bladder
• Detrusor sphincter dyssynergia (DSD) may also be present
  • this is when the bladder contracts to void but the sphincter remains tight
  • this causes increased pressure in the bladder which can result in urine being forced back up the ureters to the kidney - this can result in kidney damage
• May experience incomplete bladder emptying

Flaccid Bladder

• Observed in people with a spinal cord injury below T12 (lower motor neuron SCI)
• Limited/no ability to feel bladder fullness
• The bladder muscle cannot contract to empty the bladder resulting in the bladder overfilling (urinary retention)
• The voiding reflex is not intact between the bladder and spinal cord
• The sphincter muscle can also be relaxed, causing urine to leak out of the bladder when it overfills or during some activities such as transfers, sneezing, coughing etc.
• Unable to empty bladder voluntarily

Table 1 summarises storage and voiding dysfunction based on the level of the spinal cord lesion.

Table 1. Spinal cord level of injury and storage and voiding dysfunction

Level of spinal cord lesion	Bladder dysfunction
Suprasacral (upper motor neuron injury)	Overactive detrusor Hyperreflexic external urethral sphincter High detrusor pressure (>40 cm H2O) Detrusor sphincter dyssynergia (DSD) Urinary incontinence
Mix (upper and lower motor neuron injury)	Overactive detrusor Hyperreflexic or flaccid external urethral sphincter High detrusor pressure (>40 cm H2O) Detrusor sphincter dyssynergia (DSD) or detrusor sphincter areflexia Urinary incontinence
Sacral (lower motor neuron injury)	Areflexic or flaccid detrusor External urethral sphincter areflexia/flaccidity Overflow urinary incontinence

Management of Bladder Dysfunction

Spastic Bladder Management

Goals:

1. To reduce overactivity in the bladder wall muscle to decrease or eliminate accidents, leaking, and wetness.
2. To prevent high detrusor pressure and damage to the upper urinary tract.

Draining the Bladder

The following methods can be used to drain the bladder:

• Indwelling catheters:
  • an indwelling urethral catheter is not recommended unless a patient has difficulty self-catheterising. Example: patient with quadriplegia or in the presence of urethral abnormalities
  • regular follow-up with imaging and cystoscopy is required due to an increased risk of urinary tract infection, renal impairment, bladder stone formation, urethral stricture, urethral erosion, and bladder cancer
  • a suprapubic catheter is easier to manage and is an option for patients with quadriplegia
• Condom catheters
  • used to catch leaks, but not for emptying the bladder
• Intermittent catheterisation
  • Clean Intermittent Catheterisation (CIC)
  • Sterile Intermittent Catheterisation (much higher cost)
  • CIC is the " the preferred form of management of the bladder when adequate low intravesical pressure and acceptable bladder capacity are achievable". However, Wu et al. note that over 45% of patients who initially rely on CIC switched to urethral or suprapubic catheters after 11 years of follow-up based on their preference and physician recommendation.

Intermittent catheterisation (CIC)

Females: Finding the right hole (meatus) can be difficult when learning to perform CIC. The meatus is located just below the clitoris and above the vagina. A magnified mirror may help patients see the area. If the catheter is mistakenly inserted into the vagina, it should be left there as a landmark when the new catheter is being inserted. A clean catheter should be inserted ABOVE the vagina into the meatus.

Recommended positions for self-catheterisation for females are shown in Figure 1.

Figure 1. Recommended positions for self-catheterisation for females. Permission obtained form Delparte JJ, Chau BA, Mills S, Burns AS, eds. Spinal Cord Essentials: Your spinal cord rehabilitation handbook. Toronto ON: Toronto Rehab; 2016.

Please watch this video if you want to learn more about self-catheterisation for women with spinal cord injuries. This video shows self-catheterisation performed in bed.

Males: Inserting the catheter can be done in different positions, including: sitting in bed, side lying in bed, sitting in the wheelchair or on the toilet.

Recommended positions for self-catheterisation for males are shown in Figure 2.

Figure 2. Recommended positions for self-catheterisation for males.Permission obtained form Delparte JJ, Chau BA, Mills S, Burns AS, eds. Spinal Cord Essentials: Your spinal cord rehabilitation handbook. Toronto ON: Toronto Rehab; 2016.

Please watch the following video if you would like to learn about intermittent catheterisation for males with spinal cord injuries.

Medications

• Anticholinergic medications (sometimes called antimuscarinic medications) may help to relax the bladder muscles.
• This can help to reduce pressure within the bladder, increase the ability of the bladder to hold urine, and help reduce incontinence.Overall it improves compliance and quality of life
• Side effects, depending on the choice of the medication, may include memory and cognition impairment, visual blurring, oral dryness, constipation, tachycardias and arrhythmias.

Botulin Injections

• Injecting small doses of some strains of botulinum toxin (Botox) into muscles can help to reduce muscle spasms.
• Injections into the bladder wall muscle or the external sphincter muscle can help to relax these muscles to help prevent leaking and incontinence or to improve bladder emptying.
• The effects of these injections can last for 6 to 12 months.

Surgical Management

• Bladder augmentation surgery can increase the capacity of the bladder to hold urine.
  • Augmentation cystoplasty with a detubularized intestinal segment
  • Augmentation cystoplasty with an ileal segment
  • Augmentation cystoplasty with a colonic patch
• Incompetent sphincters can be treated with an artificial urinary sphincter (AUS), abdominal slings, or a transobturator tape procedure.

Flaccid Bladder Management

Goals:

1. To prevent overfilling and increased pressure in the bladder
2. To prevent leaking and wetness.

Draining the Bladder

• Intermittent catheterization or indwelling catheters
• Condom catheters or pouches may be used to catch leaks but not for emptying

Medication

• Alpha-adrenergic blockers are used to encourage the bladder sphincter muscles to relax to allow urine to flow out of the body.
• This can help with bladder emptying and help prevent urinary retention

Botulin Injections

See Spastic Bladder Management

Surgical Management

• Transurethral sphincterotomy
• Stents
  • Wire mesh stent
  • Nickel-titanium alloy tightly coiled stent
  • Complications may include stent migration, stent blockage by encrustation, UTIs and persistent haematuria

Bladder Irrigation

Bladder irrigation is a procedure that flushes the bladder using sterile liquid. Water, saline, acetic acid, or chlorhexidine can be used for this procedure. Watch this video to understand the bladder irrigation technique:

Complications of Bladder Dysfunction

The most common primary complications include urinary tract infection (UTI), urinary stones, and renal impairment

• Urinary tract infection is an infection of part of the urinary tract (kidneys, bladder or the connecting tubes
• Bladder or renal stones could cause reoccurring UTI’s
• Renal impairment can be caused by reflux and high pressure bladder

Other primary complications include:

• Incontinence
• Bladder cancer

Secondary complications include the following:

• Skin irritation and skin breakdown due to wetness from bladder complications
• Increased spasticity
• Autonomic dysreflexia characterised by a sudden rise in blood pressure in response to and irritating stimulus below the level of injury. It typically occurs in people with an injury at T6 and above

Resources

• Perez NE, Godbole NP, Amin K, Syan R, Gater DR Jr. Neurogenic Bladder Physiology, Pathogenesis, and Management after Spinal Cord Injury. J Pers Med. 2022 Jun 14;12(6):968.
• Chen YC, Ou YC, Hu JC, Yang MH, Lin WY, Huang SW, Lin WY, Lin CC, Lin VC, Chuang YC, Kuo HC; Taiwan Continence Society Spinal Cord Injury Study Group. Bladder Management Strategies for Urological Complications in Patients with Chronic Spinal Cord Injury. J Clin Med. 2022 Nov 20;11(22):6850.
• Spinal Cord Essentials. Handouts
• Decision Aid: Bladder Management After Spinal Cord Injury (SCI)