URINARY TRACT INFECTIONS

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Cystitis

Infection/Condition and Likely Organism

Suggested Treatment

Comments

Preferred Treatment

Alternative Treatment

Acute Uncomplicated Cystitis

Common organisms:

Escherichia coli

Staphylococcus saphrophyticus (in sexually active young women)

Klebsiella pneumoniae

In non-pregnant, premenopausal women with structurally and functionally normal urinary tract

Nitrofurantoin* 100mg PO q12h** for 7 days

OR

Cotrimoxazole 960mg q12h for 3-5 days

OR

Ciprofloxacin 500mg q12h for 3-5 days

Cefuroxime 250mg PO q12h for 3-5 days

*Avoid Nitrofurantoin if GFR < 60ml/min. May be used in GFR >30 but <60 with variable outcome.

 **Based on composition

Monohydrate/ macrocrystals composition : 100mg q12h

Macrocrystals composition: 50-100mg q6h

Cystitis in Pregnancy

Nitrofurantoin* 100mg PO q12h for 7 days

(Monohydrate/ macrocrystals composition 100mg q12h

Macrocrystals composition: 50-100mg q6h)

Cefuroxime 250mg PO q12h for 5 days

OR

Amoxicillin-clavulanate# 625mg PO q8h for 5-7 days

OR

Ampicillin-sulbactam 375-750mg PO q12h for 5-7 days

Repeat Urine C&S 1-2 weeks after completion of antibiotics to ensure eradication.

Treat for 7 days if recurrent.

*Avoid Nitrofurantoin in third trimester if another option available due to small risk of haemolytic anemia in newborn.

#Amoxicillin-clavulanate is generally safe in pregnancy (Category B), but there may be an increased risk of necrotizing enterocolitis associated with use in preterm, premature rupture of membranes.

Pyelonephritis

Infection/Condition and Likely Organism

Suggested Treatment

Comments

Preferred Treatment

Alternative Treatment

Acute Uncomplicated Pyelonephritis

Common organisms:

Escherichia coli

Staphylococcus saprophyticus (in sexually active young women)

Klebsiella pneumoniae

Proteus mirabilis

*Amikacin 1 gm IM/IV q24 for 14 days

OR

*Gentamicin 7mg/kg/day IM/IV q24h for 14 days

Piperacillin-tazobactam 4.5 gm IV q6h for 14 days

Obtain urine culture before starting treatment.

Perform ultrasound of the upper urinary tract to exclude obstructive pyelonephritis.

May step down to oral antibiotic guided by culture and sensitivity result once can tolerate orally and afebrile ≥48 hours.

Monitor renal function closely and rationalize according to culture report.

Other Urinary Tract Infections (UTI)

Infection/Condition and Likely Organism

Suggested Treatment

Comments

Preferred Treatment

Alternative Treatment

Complicated UTIs

Common organisms:

Escherichia coli

Klebsiella pneumoniae

Proteus mirabilis

Pseudomonas aeruginosa

Enterobacteriaceae

Enterococci

Pseudomonas spp.

 

UTI symptoms in men OR presence of a structural or functional abnormality:

Urinary tract obstruction

Chronic kidney disease

Poorly-controlled type 2 diabetes

Immunosuppression

Urinary catheter in situ

Neurogenic bladder

Post-menopausal women

History of recurrent UTIs

Nephrolithiasis

Ampicillin-sulbactam 1.5-3gm IV q6-8h

OR

Amoxicillin-clavulanate 1.2gm IV q8h

OR

Amikacin 1 gm IM/IV q24 for 14 days

OR

Gentamicin 5mg/kg IM/IV q24 for 14 days

OR

Piperacillin-tazobactam 4.5 gm IV q6h for 14 days

Imipenem 1 gm IV q8h

OR

Meropenem 1 gm IV q8h

Obtain urine culture before starting treatment and treat for 10-14 days in patients with upper tract symptoms, delayed response or sepsis.

May step down to oral antibiotic guided by C&S result once can tolerate orally and afebrile for ≥48 hours.

Asymptomatic Bacteriuria (ABU)

Urine bacterial growth ≥ 105cfu/mL of bacteria of same species in 2 serial samples in women obtained 2-7 days apart or a single sample in men without UTI symptoms.

Nitrofurantoin* 100mg PO q12h for 7 days

OR

Amoxicillin 500mg PO q12h for 7-10 days

Nitrofurantoin Monohydrate/ macrocrystals composition 100mg q12h

Macrocrystals composition – 50-100mg q6h

Cefuroxime 250mg PO q12h for 5-7 days

*Avoid Nitrofurantoin in third trimester if another option available due to small risk of haemolytic anemia in newborn.

Screening for, and treating asymptomatic bacteriuria is not recommended, except in pregnant women,

OR

prior to transurethral resection of prostate (TURP) or urological procedures breaching the mucosa

Whenever indicated, treatment should be guided by urine culture and sensitivity result.

 

References
  1. Antibiotic Treatment for Urinary tract infection, Clinical Guidelines Obstetrics and Gynecology, King Edward Memorial Hospital, Perth Western Australia.
  2. Antimicrob Chemother 2013; Duration of antibiotic treatment for acute pyelonephritis and septic urinary tract infection --7 days or less versus longer treatment: systematic review and meta-analysis of randomized controlled trial.
  3. Australian Clinical Practice Guidelines: Therapeutic Guidelines Antibiotic Version 15.
  4. Diagnosis, Prevention, and Treatment of Catheter- Associated Urinary Tract Infection in Adults: 2009 International Clinical Practice Guidelines from the Infectious Diseases Society of America.
  5. Diagnosis, Prevention, and Treatment of Catheter-Associated Urinary Tract Infection in Adults: 2009 International Clinical Practice Guidelines from the Infectious Diseases Society of America, Clinical Infectious Diseases, Volume 50, Issue 5, 1 March 2010.
  6. IDS Guidelines for the Diagnosis and Treatment of Asymptomatic Bacteriuria in Adults 2005.
  7. IDSA UTI guideline 2020.
  8. International Clinical Practice Guidelines for the Treatment of Acute Uncomplicated Cystitis and Pyelonephritis in Women: A 2010 Update by the Infectious Diseases Society of America and the European Society for Microbiology and Infectious Diseases.
  9. International Clinical Practice Guidelines for the Treatment of Acute Uncomplicated Cystitis and Pyelonephritis in Women: A 2010 Update by the IDSA and European Society for Microbiology and Infectious Diseases 2011.
  10. J antimicrobial therapy 2015; Huttner A et al; Nitrofurantoin revisited: a systematic review and meta-analysis of controlled trials.
  11. National Antimicrobial Guideline, Third Edition. Petaling Jaya: Ministry of Health, Malaysia; 2019.
  12. SA Health UTI Treatment Clinical Guidelines 2017.
  13. The Sanford Guide to Antimicrobial Therapy 2017 (47th edition).
  14. Urological Infections - European Association of Urology Guidelines March 2017.