Asymptomatic Urinary Tract Infection Edward L Goodman MD
- Slides: 51
Asymptomatic Urinary Tract Infection Edward L. Goodman, MD FACP, FIDSA, FSHEA October 12, 2009
Nicolle et al IDSA Guidelines for Asymptomatic Bacteriuria. Clin Inf Dis 2005; 40: 643 -54
So, it’s common- big deal! • We’ve got The Sanford Guide – – We can look it up conveniently Who needs a lecture? • For those of us who can’t read the small print – We’ve got Epocrates, Hopkins-abxguide. com – Current house staff were all born with an IPhone™ clutched in their hands! • What’s the big deal – just treat it! – A whole lecture on this?
Definitions: Asymptomatic Bacteriuria • “Gold standard” for bacteriuria = >=100, 000 CFU/ml voided urine – Applied to Asymptomatic Bacteriuria – Almost always present in acute pyelonephritis – Kass, EH. Trans Assoc. Amer. Phys 69: 56, 1956
Definitions: Symptomatic Bacteriuria • Acute cystitis in women: >= 100 CFU/ml – 95% sensitivity; 85% specificity* • Acute pyelonephritis: > 100, 000/ml** • (The standard 0. 001 ml loop cannot detect <1000 organisms/ml) • *Stamm WE. NEJM 3229: 1328, 1982 • **Kass 1956
Infectious Disease Society Consensus Definition • Cystitis: >=10³ cfu/ml – Sensitivity 80%; Specificity 90% • Pyelonephritis: >=10, 000 cfu/ml • Can be identified in routine micro labs using 0. 001 ml loop • Rubin et al. Clinical Infectious Disease, 1992
Symptoms • Acute: irritation, obstruction or inflammation – correlate with significant bacteriuria • Chronic: incontinence, hesitancy, hematuria – do not correlate with bacteriuria in elderly • In demented: non-specific symptoms such as altered mentation are fairly sensitive for systemic infection
Colonization vs. Infection • Bacteriuria is almost always associated with a host response – Pyuria – Cytokinuria • HENCE, THE TERM COLONIZATION OF URINE IS OBSOLETE. It is infection, asymptomatic or symptomatic
Why So Many Urine Cultures? • Annually 10, 400 urine cultures are submitted to the PHD Microbiology Laboratory – Exceeded only by 14, 000 blood cultures • At least one third from catheterized patients – Often cath specimens are mislabeled as voided – It is an effort to obtain a clean catch urine from a hospitalized patient – Catheter urine is so convenient to culture! • Nursing preferences play a major role
HCW’s Attitudes and Perceptions • HCW interpret bacteriuria as symptomatic in presence of nonspecific symptoms • Urine cultures are thus ordered for nonspecific changes in patient’s status – part of the “panculture” mentality • Difficulty in eliciting information about symptoms in frail elderly
Attitudes and Perceptions – 2 • Physician’s uncertainty about significance and management of positive urine culture • Liability concerns – A positive culture left untreated looks “bad” in the chart • Walker et al. CMAJ 2000; 163 (3): 273
Does Rx for AB Help? • All data is from elderly in long term care facilities • Early studies (Platt, NEJM 1982; 307: 637) suggested AB associated with three fold higher mortality – Therapy had no protective effect – AB seems to be a marker of debility • More recent comparative studies confirm no benefit from Rx and no higher mortality in non Rx
Case Presentation • 91 year old woman admitted from NH with fever, altered mental state and drainage from recent hip incision, no urinary sx • Urine culture from cath inserted in ER: >100, 000 Pseudomonas aeruginosa • Diagnosis: “Urosepsis” – BUT
Case continued • Blood and hip aspirate cultures: MRSA • No response to anti-pseudomonas Rx: still confused • Woke up with Vancomycin • Diagnoses: – Infected total hip with secondary bacteremia – MRSA – Asymptomatic bacteriuria - Pseudomonas
Fever and UTI in Elderly Institutionalized • Prospective study – Jan 1, 1989 through Dec 31, 1990 – Two LTCF in Canada • Demographics – M: F 3: 1 – Majority >65 years – Catheters 5. 7% to 9. 3% Nicolle, AJM 1996; 100: 71.
Fever and UTI in Elderly Institutionalized • Entry Criteria – Fever • Urine cultures, UA at enrollment and Q 4 weeks • Monitored serum antibody – Major Outer Membrane Protein (MOMP) of E coli for all enterobacteriaceae – Ig. G to other organisms
Fever and UTI in Elderly Institutionalized: Definitions • Fever >38 (100. 4) • Sx UTI for non cath required at least 3: • • • Fever or chills* New or increased lower tract irritation New flank or suprapubic pain or tender Change in character of urine Worsening mental status* – *our case
Definitions continued • Indwelling catheter: two symptoms – – Fever or chills New flank or suprapubic pain/tender Change in character of urine Worsening mental status • Bacteriuria – Non cath >= 100, 000/ml of one or two bugs – Condom cath >=100, 000 of <3 bugs – Cath: any number
Febrile Morbidity in long term care patients • Prevalence of bacteriuria - 50% – <10% were catheterized • Positive Predictive Value of bacteriuria for clinical UTI – 11% • PPV of bacteriuria for serologic UTI – 12% • <10% of episodes of unexplained fever were attributable to UTI • Nicolle, AJM 1996; 100: 71.
To Summarize • Bacteriuria very common in uncatheterized long term care patients • Poor correlation of bacteriuria with symptoms attributable to urinary tract • Bacteriuria rarely explains fever in absence of localizing symptoms • Most treatment for AB is inappropriate
Should AB ever be treated? • Pregnant women – AB Prevalence: 4 -7% – Optimal time to screen is 16 th week – Symptomatic infection develops in 20 -40% of those with AB (1 -3% of all pregnancies) – Premature labor in 20 -50% with symptomatic UTI – Successful Rx of AB reduces rate of symptomatic UTI by 80 -90% – Patterson TF, Andriole VT. Inf Dis Clin NA 1997; 11: 593 -608
Nicolle et al IDSA Guidelines for Asymptomatic Bacteriuria. Clin Inf Dis 2005; 40: 643 -54
When to Rx AB – cont’d • Prior to renal transplant • Prior to invasive urinary procedures – TURP, biopsy prostate – not for insertion of catheter (even if valvular heart disease even with infected urine) • Unclear before insertion of prostheses: heart valve, total hip or knee
Case Presentation 2 • 39 woman, 250 pounds, three previous THR. No urinary sx. • Pre op: “dirty” voided UC: 30 k E coli and Klebsiella • Three days of cefamandole (the first of the 2 nd generation cephalosporins) and tobramycin starting at time of surgery • 6 weeks later, E coli found in infected hip – Different biotypes and MIC’s
Case 2 - continued • She sued the surgeon alleging negligence for replacing hip in setting of positive urine culture • Defense expert testified – the two organisms were unrelated – the literature didn’t support any increased risk of SSI from asymptomatic UTI*
*Review of literature on urine cultures prior to hip surgery • Lawrence, Kroenke. Arch Int Med 1988; 148: 1370 -1373 – Chart review 200 consecutive knee procedures • Excluded insertion of prostheses – Criteria for abnormal UA established – 10% UA’s indicated, 90% not – SSI: 1/166 with normal UA; 0/23 with WBC • Overall infection rate 0. 5% (95% CI: 0 -2. 3%)
Literature - continued • Health Technology Assessment 1997; 1: 4347 – No controlled trials on value of routine preop urine testing – Routine preop urine abnormal 1%-34. 1% • Leads to change in management in only 0. 1%-2. 8%! – No good evidence that preop abnormal UA is associated with any postop complication
Case - continued • Plaintiff’s expert stated “An E coli is an E coli. Don’t bother me with genetics. ” • SHE RECEIVED A SETTLEMENT! – Given more time, I would be happy to expound on medical legal issues
Catheter Associated UTI • • • Short term catheter <30 days Long term catheter >30 days Prevention of bacteriuria Prevention of complications of bacteriuria Avoidance of urethral catheters Warren Inf Dis Clin NA 1997; 11: 609 -622
How Significant is Pyuria in Foley Urine? • Definition – Standard: 5 WBC/hpf – Hemocytometer: 10 WBC/µl • Does not correlate with catheter related symptomatic infection. • SHOULD NOT BE USED AS REASON TO OBTAIN FOLEY URINE CULTURE • Tambyah, Maki. Arch Int Med 2000; 160: 673
Short Term Catheter • 15 -25% of acute care patients have catheter – Mean/median duration between 2 and 4 days – At 3% to 10% incidence/day, 10% to 30% will develop catheter associated bacteriuria (CAB) during their hospital stay –Warren Inf Dis Clin NA 1997; 11: 609 -622
Risk Factors for CAB Platt. Am J Epid 1986; 124: 977 • • • Duration of catheter Absence of urinometer Colonization of drainage back/back flow Diabetes No receipt of antibiotics Female For other than surgery or output measures Abnormal serum creatinine Errors in catheter care
Complications of Short Term Catheter • Most episodes of AB are asymptomatic • Fever or UTI sx in up to 30% – <5% associated with bacteremia – Attributable mortality <15% of bacteremic (0. 75% of symptomatic patients with short term foley) • Given large number of short term catheters nationwide, up to 15% of nosocomial bacteremias (symptomatic or not) are from UTI
PHD 2001 Survey Data courtesy of Sharon Williamson, MT(ASCP) and Bobby Moore, MT (ASCP) PHD Microbiology Lab • Review Micro Lab Computer for – All patients with positive urinary catheter culture and – Positive blood cultures drawn same day • Exclude urine positive for Staph aureus and Candida since – Literature states these are more likely causes of the bacteriuria rather than the consequence
Cases with same isolate in BC/UC • Total 19 cases – 14 E coli – 2 Proteus mirabilis • 1 had three other urinary isolates as well – 2 Klebsiella pneumoniae – 1 Morganella morganii
Cases with different isolates • 55 total cases – Skin flora in blood: 40 • Seven had 2 + BC for CNS – likely pathogens • 33 had single + BC – unclear significance – Definite pathogens in blood: 16 – Combined definite and likely: 23 cases
Likelihood of Positive Foley Culture As Cause of “urosepsis” • 19/42 (45%) bacteremic episodes in this cohort of catheterized patients were attributable to urine isolate • 23/42 (55%) bacteremic episodes not related to urine isolate – would have been missed if therapy based on urine only! – Recall Case #1 • Pseudomonas AB from foley; MRSA in blood
Conclusion • In an acute care hospital, cannot assume that a positive urine culture from catheterized patient is the cause of a febrile episode • Must always draw blood culture before initiating therapy • Keep an open mind about other sites for fever
Long Term Catheters • Prevalence: more than 100, 000 NH patients in USA • Incidence of bacteriuria still 3% to 10%/day • At 30 days, almost 100% prevalence! – 95% polymicrobial – Catheter bugs not the same as bladder bugs at least 25% of the time (biofilm theory)
Complications of Long Term Catheters • Two thirds of febrile episodes in aged LTC attributed to UTI – Incidence: one febrile episode per 100 catheter days – MOST SELF LIMITED (<1 day) – Therapy not usually indicated
Other Complications of LTC • Catheter obstruction – Related to biofilm production • Infection stones • Chronic renal inflammation – Chronic pyelo usually only with obstruction/stones • Urethritis/fistulae, epididymitis, prostatitis • Bladder cancer
Prevention/delay of CA Bacteriuria • Closed catheter system • Remove catheter when possible* • Delay onset – Coated catheters largely ineffective – Systemic antibiotics work but at the cost of ultimately causing • Adverse effects • Multidrug resistant isolates emerge
Prevent Complications of CA Bacteriuria? • Search out and treat AB? – Prospective trial (Warren JAMA 1982; 248: 454) • no effect on preventing fever • Marked increase in resistance • DO NOT TREAT CAB except in – epidemics or clusters – High risk patients • Pregnancy, renal transplant, urologic surgery
What about symptomatic UTI in catheterized patient? • Always look for non-UTI explanations as well – Blood cultures • Treat with specific therapy for 10 -14 days assuming occult pyelonephritis – Change catheter and obtain new culture before Rx • Clinical and bacteriologic outcomes better • More reliable culture from newly inserted catheter with no biofilm – Raz. J Urol 2000; 164: 1254
What about Candiduria? • 10% of positive urine cultures in referral hospitals yield candida sp. • Symptomatic candiduria should be treated • What about catheter associated candiduria? – Short term eradication with 14 days fluconazole – No effect on candiduria two weeks after therapy – No effect on mortality Sobel. Clin Inf Dis 2000; 30: 19
Incidentally • 10/1/08 CMS announced that treatment for hospital acquired UTI would not be compensated – Should we screen new admissions for bacteriuria? – If we do • They will be treated! • There will be increased MDR organisms including MRSA • C diff will emerge • THR Chief Quality Officers Council has agreed that we WILL NOT ROUTINELY SCREEN FOR AB ON ADMISSION
Thanks to the following persons for their assistance: • • • Sharon Williamson, MT (ASCP) Bobby Moore, MT (ASCP) Tammy Chung, Pharm. D Carla Philmon, Pharm. D Teri Smith, Pharm. D Judith Marshall, R. Ph
Historic overview on treatment of infections • • • 2000 BC: Eat this root 1000 AD: Say this prayer 1800’s: Take this potion 1940’s: Take penicillin, it is a miracle drug 1980’s – 2000’s: Take this new antibiotic, it is even a bigger miracle! • ? 2010 and beyond: Eat this root!
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