Management of UTI for 6 marks University exam
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Management of Urinary Tract Infection (UTI)
(6-Mark University Exam Answer)
Classification Before Management
Proper management depends on correctly classifying the infection:
- Uncomplicated UTI - infection confined to the bladder (cystitis) in a non-catheterized patient with no structural or functional urinary tract abnormality
- Complicated UTI - infection extending beyond the bladder (pyelonephritis, prostatitis, bacteremia) or occurring in a catheterized patient
- Recurrent UTI - >2 episodes in 6 months or >3 episodes in 12 months
- Asymptomatic bacteriuria (ASB) - bacteria in urine WITHOUT symptoms; does NOT require treatment (except in pregnancy and before high-risk urologic procedures)
I. General (Non-Pharmacological) Measures
- Adequate hydration - increases urine flow and helps flush bacteria
- Urinary analgesics - Phenazopyridine (200 mg TDS) for dysuria relief (symptomatic, not curative)
- Avoid spermicide-based contraception - a risk factor for recurrent UTI
- Post-coital voiding in women with coitally-associated recurrence
- Treat any underlying structural abnormalities (stones, obstruction)
II. Antimicrobial Management
A. Uncomplicated Acute Cystitis
| Drug | Dose | Duration | Notes |
|---|---|---|---|
| Nitrofurantoin (first-line) | 100 mg BD | 5-7 days | Avoid if GFR <30 ml/min; not for pyelonephritis |
| TMP-SMX (co-trimoxazole) | 1 DS tablet BD | 3 days (women), 7 days (men) | Avoid if local resistance >20% |
| Fosfomycin | 3 g sachet | Single dose (women) | Excellent for MDR organisms |
| Fluoroquinolones (e.g., ciprofloxacin) | Dose varies | 3 days (women), 7 days (men) | Reserve; risk of resistance selection |
| β-Lactams (e.g., amoxicillin-clavulanate) | Dose varies | 5-7 days | Less preferred due to higher recurrence rates |
- Fluoroquinolones are NOT recommended as first-line for uncomplicated cystitis due to antimicrobial stewardship concerns
- Antibiotic choice should be guided by local/regional antibiograms
(Harrison's Principles of Internal Medicine, 22e - Table 40-1)
B. Acute Pyelonephritis
Outpatient management (mild-to-moderate, no vomiting, tolerating oral):
- Ciprofloxacin 500 mg BD PO x 7 days
- TMP-SMX 1 DS tablet BD x 14 days
- Total duration: 7-14 days (guidelines)
Inpatient management (severe, sepsis, vomiting, immunocompromised):
- IV Ciprofloxacin 400 mg every 12 h
- IV Ceftriaxone 1-2 g once daily
- IV Piperacillin-tazobactam 3.375 g every 6 h
- IV Gentamicin 3 mg/kg/day ± Ampicillin
- Carbapenems (Ertapenem, Meropenem) for suspected MDR organisms
- Step-down to oral agents once clinically stable
- Total duration: 7-14 days; up to 21 days if sepsis syndrome
(Tintinalli's Emergency Medicine, Table 91-6)
C. Catheter-Associated UTI (CAUTI)
- Remove or replace the urinary catheter before collecting cultures and initiating antibiotics
- Treat based on culture and sensitivity
- Duration: 7-14 days
D. Asymptomatic Bacteriuria (ASB) - Special Cases Requiring Treatment
| Situation | Treatment |
|---|---|
| Pregnancy | Must treat (risk of pyelonephritis, preterm birth, low birth weight) |
| Before urologic procedures (e.g., TURP, lithotripsy) | Must treat to prevent bacteremia |
| All others | Do NOT treat |
III. Management of Recurrent UTI
Prophylaxis options:
- Continuous low-dose prophylaxis - Nitrofurantoin 50-100 mg at bedtime or TMP-SMX half-tab nightly
- Post-coital prophylaxis - single dose of nitrofurantoin or TMP-SMX after intercourse
- Self-start therapy - patient-initiated short course at first symptoms (with prior counselling)
- Women using spermicide should be counselled to change contraception method
- Refer to primary care physician for culture and prophylaxis planning after recurrence
IV. Special Populations
| Population | Consideration |
|---|---|
| Pregnancy | Avoid fluoroquinolones, TMP (1st trimester), nitrofurantoin (near term); use beta-lactams, fosfomycin |
| Men | Treat for 7 days minimum; consider prostatitis if febrile |
| Children (febrile UTI) | 7-14 days antibiotic; guided by local antibiogram |
| Immunocompromised | Treat for longer; monitor closely |
V. Follow-Up
- Uncomplicated cystitis: No routine follow-up or post-treatment culture needed if symptoms resolve
- Pyelonephritis: Follow-up culture at 1-2 weeks to confirm eradication
- Recurrent UTI: Repeat culture 1-2 weeks after therapy; investigate for structural/functional cause (ultrasound, cystoscopy if warranted)
- Complicated UTI: Culture and sensitivity should always guide treatment
Key Points to Remember for Exam
- ASB does not need treatment except in pregnancy and pre-urologic procedure
- First-line for uncomplicated cystitis = Nitrofurantoin or TMP-SMX (NOT fluoroquinolones)
- Pyelonephritis duration = 7-14 days (oral or step-down from IV)
- CAUTI - always remove/replace catheter first
- Recurrent UTI = prophylaxis (continuous, post-coital, or self-start)
- Antibiotic selection must be guided by local resistance patterns
Sources: Harrison's Principles of Internal Medicine 22e (2025), Tintinalli's Emergency Medicine (Table 91-5/6), Campbell-Walsh Wein Urology
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