Questions & explanations
1. A patient with neurogenic bladder develops frequent UTIs despite clean intermittent catheterization. What additional steps could be considered?
First, check that the catheterization technique is truly clean and the patient is using proper hygiene. Consider sending urine cultures to identify the bacteria and their antibiotic sensitivities. The doctor might prescribe a low-dose antibiotic prophylaxis, such as nitrofurantoin or trimethoprim-sulfamethoxazole, taken daily. Another option is to use a bladder instillation of antibiotics or hyaluronic acid. Also, evaluate if the bladder is emptying completely; if not, adjusting the catheterization schedule or adding medications like oxybutynin may help. In some cases, surgical procedures like bladder augmentation or a urinary diversion might be discussed.
2. How does multiple sclerosis (MS) affect bladder function?
Multiple sclerosis (MS) damages the protective coating (myelin) around nerves in the brain and spinal cord, which can disrupt bladder control. Most people with MS develop an overactive bladder, causing urgency (sudden need to pee), frequency (peeing often), and urge incontinence (leaking before reaching the toilet). Some may also have difficulty emptying the bladder (retention). Management includes anticholinergic medications to calm the bladder, timed voiding (peeing on a schedule), and intermittent catheterization if retention is present. Treating MS itself with disease-modifying therapies can help slow progression of bladder symptoms.
3. How does a spinal cord injury cause neurogenic bladder?
A spinal cord injury (SCI) can disrupt the nerves that connect the bladder to the brain. If the injury is above the sacral region (upper spine), the bladder may become spastic and contract without warning, causing leakage (reflex incontinence). If the injury is in the sacral region (lower spine), the bladder may become flaccid and unable to contract, leading to urinary retention (inability to empty). In both cases, the bladder does not function normally. Management depends on the type of dysfunction. For example, a spastic bladder may be treated with medications to relax it, while a flaccid bladder may require catheterization.
4. Why is tamsulosin preferred over calcium channel blockers for MET?
Tamsulosin is preferred because it is more effective and has fewer side effects than calcium channel blockers. Tamsulosin is an alpha-blocker that relaxes the smooth muscle of the ureter, making it easier for the stone to pass. Studies show tamsulosin increases stone passage rates by about 30% compared to no treatment. Calcium channel blockers like nifedipine also relax the ureter but can cause headaches, dizziness, and low blood pressure. Tamsulosin is generally well-tolerated, with common side effects like nasal stuffiness or dizziness. Therefore, guidelines recommend tamsulosin as first-line MET for distal ureteral stones.
5. What are the main reasons to actively remove a kidney stone instead of waiting?
Active stone removal is needed when the stone causes problems that cannot be managed by waiting. The main reasons are: stone size larger than 10 mm (unlikely to pass on its own), stone location in the kidney or upper ureter (harder to pass), blockage of urine flow (hydronephrosis), signs of infection like fever or chills, and pain that does not get better with medicines. Also, if the stone is causing kidney damage or if the patient has only one working kidney, removal is often recommended. Other reasons include the patient's job (e.g., pilots) or travel plans. The doctor decides based on the stone and the patient's health.
6. Compare an artificial urinary sphincter with a male sling for post-prostatectomy incontinence.
Both treat incontinence after prostate surgery, but they work differently. The AUS is more effective for severe incontinence, with success rates over 80%. It gives active control by opening and closing the urethra. A male sling is a mesh that compresses the urethra to provide passive resistance. It works best for mild to moderate incontinence. The sling is less invasive and has fewer parts, but it may not help severe leaks. The AUS has a higher risk of infection or device failure and requires surgery to replace the battery (the balloon) every 5-10 years. The choice depends on incontinence severity and patient preference.
7. Compare the bladder risks of stem cell transplant with those of chemotherapy alone for cancer treatment.
Both stem cell transplant and chemotherapy can cause hemorrhagic cystitis, but the risk is higher with transplant. Chemotherapy alone may cause cystitis from drugs like cyclophosphamide. In transplant, patients receive high-dose chemotherapy before the transplant, increasing bladder damage. Additionally, transplant patients are at risk for viral cystitis from BK virus or cytomegalovirus, which does not occur with chemotherapy alone. The immune suppression after transplant also delays healing. Therefore, bladder problems after transplant are more complex and require monitoring for both chemical and infectious causes.
8. How does knowing the stone type help prevent recurrence?
Knowing the stone type (e.g., calcium oxalate, uric acid, cystine, struvite) helps target prevention. For calcium oxalate stones, the focus is on low oxalate diet, moderate calcium, and low salt. For uric acid stones, the goal is to reduce animal protein and sometimes take medicine to make urine less acidic (like potassium citrate). For cystine stones, high fluid intake and medicines that bind cystine are needed. Struvite stones are caused by infection, so preventing urinary tract infections is key. Stone analysis is done by sending the passed stone to a lab. This information guides specific prevention strategies.
9. Compare chemotherapy and immunotherapy for advanced bladder cancer.
Chemotherapy uses strong drugs to kill fast-growing cancer cells throughout the body. It is often given before or after cystectomy for muscle-invasive bladder cancer, or as the main treatment when cancer has spread. Immunotherapy helps the body's own immune system fight the cancer. It is used when bladder cancer comes back after chemotherapy or when a patient cannot take chemotherapy. Both treatments can shrink tumors and improve survival, but they have different side effects. Chemotherapy can cause nausea, hair loss, and low blood counts, while immunotherapy may cause fatigue, rash, or inflammation in organs.
10. Compare radical cystectomy and intravesical chemotherapy for BCG failure.
Radical cystectomy removes the entire bladder and nearby lymph nodes, offering a chance for cure but requiring major surgery and a urinary diversion (a new way to store and pass urine). Intravesical chemotherapy puts drugs like gemcitabine or mitomycin into the bladder, which is less invasive and preserves the bladder, but the cancer may return more often. Radical cystectomy is usually preferred for fit patients with aggressive or high-risk cancer, while intravesical chemotherapy is an option for those who cannot have surgery or want to keep their bladder. Both treatments aim to control cancer after BCG fails.
11. What is the most common way to manage a neurogenic bladder that cannot empty?
The most common way is clean intermittent catheterization (CIC), where a thin tube (catheter) is inserted through the urethra into the bladder to drain urine several times a day. This is done every 4-6 hours to keep the bladder empty and prevent infections and kidney damage. Patients or caregivers can learn to do this at home with clean technique (washing hands and cleaning the catheter). CIC is preferred over an indwelling catheter (left in place) because it has fewer complications like infections and bladder stones. Some patients may need medications to help the bladder store urine between catheterizations.
12. Compare intravesical antibiotic instillation with oral antibiotic prophylaxis for recurrent UTI in terms of efficacy and side effects.
Both methods aim to prevent UTIs, but they work differently. Intravesical instillation delivers a high drug dose directly to the bladder, often with fewer systemic side effects like nausea or allergic reactions. Oral prophylaxis is easier to take at home but can cause gut issues and promote antibiotic resistance. Studies show intravesical therapy can be as effective or more effective in some patients, especially those with resistant bacteria. However, intravesical therapy requires clinic visits and catheter insertion, which can be uncomfortable. The choice depends on patient preference and infection pattern.