Urinary Tract Infections Flashcards
(33 cards)
Epidemiology
• Incidence in ♀ ≈ 12% annually
▫ 50% of ♀ report to have had a urinary tract infection (UTI) by age 32
▫ Significantly less common in ♂
▫ Incidence increases with age (as does asymptomatic bacteriuria)
• Recurrence occurs in 25% of ♀ within 6 months of 1st UTI
▫ This increases when > 1 prior UTI experienced
• UTI is the 8th most common reason for ambulatory clinic visits and 5th
most common reason for emergency department visits in Canada
pt prescribed TMP/SMX BID x 3 days
for UTI
what is first thing pharmacist should do?
assess to confirm symtpoms
pathophys
ascend urethra and getinto bladder to cause infection and occasinally to kdines
urethra shorter in females than males so more common
Urinary Tract Infection (UTI)
symptoms
• Bacterial infection of urinary tract
▫ Cystitis (lower)
▫ Pyelonephritis (upper)
• Symptoms
▫ Cystitis (LOW UT) → dysuria ± increased frequency, urgency, suprapubic pain, or hematuria
▫ Pyelonephritis (UPPER UT)→ fever, chills, flank pain/tenderness, ± typical cystitis symptoms (more systemic)
• Asymptomatic bacteriuria (ASB) → bacteria in urine in quantitative counts that are consistent with growth in bladder/kidneys without symptoms referable to the urinary tract
▫ Usually treatment of this is unnecessary, no evidence to treat, sometimes ppl get symptoms after treating
TERT for prostate enlargement
Predisposing Factors - ♀
• Sexual intercourse (75-90%) (freq of intercourse correlated to infection)
• Spermicide use
• New sexual partner within past year
• Previous urinary tract infection
• Family history of urinary tract infection in first degree female relative
• Menopause
• Diabetes and other complicating factors (see slide on complicating
factors)
Predisposing Factors - ♂
• Benign prostatic hypertrophy
• Previous urinary tract surgery
• Recent procedures (including cystoscopy, catheterization, prostate
biopsy)
• Anatomic or physiologic abnormalities (incomplete bladder emptying)
• Age > 65 years
• Uncircumcised
• Immunocompromised
• In young sexually active men, engaging in sex with infected female
partner or engaging in anal intercourse
Complications of UTI
outcome less than ideal as result of UTI
More common in the setting of complicated than with uncomplicated UTI
• Bacteremia - into blood
• Sepsis (urosepsis)
• Systemic inflammatory response syndrome
• Renal abscess (rare 1/1,000 cases) - more common in diabetes
• Prostatitis, epididymitis, orchitis in men
UTI Investigations
• Symptoms to ask about
▫ Dysuria, frequency, urgency, suprapubic pain, hematuria
▫ Vaginal discharge, odour, pruritis; painful intercourse
(Vaginitis becomes more likely when these are present, especially if no urinary frequency or urgency)
▫ Flank pain/tenderness, fever/chills, nausea/vomiting
• Cloudy, foul-smelling urine ≠ UTI symptoms!
gives pressure to treat, need symptoms first, could be asymptomatic bactinnuria
older aldut pt
criteria for symptomatic UTI
see slide 13
noncath vs catherized
Older Adult Patients
• Nonspecific symptoms
▫ Worsening mental status
▫ Worsening functional status
▫ Increased confusion, delirium, or agitation
▫ New or more frequent falls
▫ These do NOT indicate UTI!
▫ If medical status not rapidly declining (and not on fluid restriction)
Hold (i.e., don’t start) antibacterials
Ensure adequate hydration (push fluids, water, tea , juice)
Observe (24 hours)
▫ If typical UTI symptoms develop, treat as UTI
▫ If nonspecific symptoms continue without development of typical symptoms,
assess for other causes of nonspecific symptoms
Complicating Factors
• Complicated UTI if symptomatic of UTI in presence of complicating factors – Structural, functional, or metabolic conditions that promote UTI and put the patient at risk of resistant pathogens and/or treatment failure • Examples of complicating factors: ▫ Male sex ▫ Chronic obstruction ▫ Diabetes (poorly controlled) ▫ Indwelling urinary catheter ▫ Nephrolithiasis ▫ Immunosuppression ▫ Pregnancy • In absence of complicating factors, considered uncomplicated UTI
Microbiology – Usual Pathogens
• Escherichia coli (up to 95% of uncomplicated UTI, still majority in complicted)
• Others: ▫ Klebsiella pneumoniae ▫ Proteus mirabilis ▫ Other Enterobacterales ▫ Staphylococcus saprophyticus ▫ Pseudomonas aeruginosa ▫ Enterococcus spp ▫ Streptococcus agalactiae (if pregnant or diabetic)
T/F a urine culture is required for diagnosis of UTI
false
ppredictable microbiology
high rate of spontaneous resolution
Laboratory Investigations
when is urine C&S needed
• Sending urine for C&S generally not recommended if asymptomatic
• Uncomplicated UTI → urine C&S usually not necessary
▫ Potential exceptions:
Early recurrence of infection
Recent travel outside Canada/US or recent hospitalization
Atypical presentation
Pyelonephritis
• Complicated UTI → urine C&S recommended
▫ If urinary catheter in place for ≥ 2 weeks, it should be discontinued or changed before specimen collection
• Blood C&S → recommended if patient febrile, hemodynamically unstable, pyelonephritis, or immunocompromised
biofilm on catheter, higher rate of tx failure
Laboratory Investigations
pyruia
nitrites
• Pyuria (identified via urinalysis or urine dipstick)
▫ Does not identify symptomatic infection (present in majority of ASB patients)
▫ High negative predictive value, particularly in older patients (rule out UTI)
In younger patients with uncomplicated UTI, urinalysis/urine dipstick should not be obtained and patients should be treated on basis of presence of
symptoms alone
• Nitrites (identified via urinalysis or urine dipstick)
▫ Reduction of nitrates to nitrites by Gram negative bacteria
▫ Not particularly helpful
• Ultrasound or CT sometimes used when pyelonephritis is suspected
• If urine C&S sent
▫ antibacterial initiation should be delayed until results of culture available, if
possible
▫ When antibacterials started empirically, choice of agent should be re-evaluated once culture results available
tx should usually be offed, dont wait
Treatment – Uncomplicated UTI
Cystitis
• Nitrofurantoin monohydrate/macrocrystals 100 mg po BID x 5 days
• Fosfomycin 3 g po x 1 dose
• Alternatives: no antibacterial exposure within last 6 months
▫ Cephalexin 250-500 mg po QID x 5-7 days
▫ TMP/SMX i DS tab po BID x 3 days
Can use TMP 100 mg po BID x 3 days if sulfa allergy
• Alternatives: Other
▫ Cefixime 400 mg po once daily x 5-7 days
▫ Fluoroquinolone* x 3 days
some countries just use TMP
norfloxacin - narrowest spectrum
FDA Advisory – Fluoroquinolones (2016)
• Fluoroquinolone antibacterials associated with disabling and potentially permanent side effects of the tendons, muscles, joints, nerves, and central nervous system that can occur together in the
same patient.
• …fluoroquinolones should be reserved for use in patients who have no other treatment options for acute bacterial sinusitis, ABECB, and uncomplicated urinary tract infections because the risk of these serious side effects generally outweigh the benefits in these patients
Empiric Treatment – Uncomplicated UTI
Pyelonephritis
Outpatient
• Ceftriaxone 1-2 g IV/IM x 1 dose, followed by oral therapy
• Gentamicin 5-7 mg/kg IV/IM x 1 dose, followed by oral therapy
Oral therapy • Cefixime 400 mg po once daily • Amoxicillin-clavulanate 875^ mg po BID • Fluoroquinolone • TMP-SMX i DS tab po BID x 7-10 days
Hospitalized/Septic
• Ceftriaxone 1-2 g IV q24h
• Gentamicin 5-7 mg/kg IV q24h
x 7-10 days
Empiric Treatment – Complicated UTI
Prolonged fever, renal function deterioration,
or septic presentation requires further
investigation for abscess/undrained collection
Lower urinary tract – no systemic features • Cefixime 400 mg po once daily • Amoxicillin-clavulanate 875^ mg po BID • Fluoroquinolone • TMP-SMX i DS tab po BID x 7-10 days*
Pyelonephritis and/or systemic features • Ampicillin 1-2 g IV q6 PLUS [Ceftriaxone 1-2 g IV q24h OR Gentamicin 5-7 mg/kg IV q24h] x 7-10 days*#
Septic/Hemodynamically Unstable
• Piperacillin-tazobactam 3.375 g IV q6h
± Gentamicin 5-7 mg/kg IV q24h
x 7-10 days*#
* Continue Abx therapy for 3-5 days after defervescence or elimination of obstruction/infected focus If lower tract infection and prompt response (within 48h), treat for 7 days. If delayed response or structural abnormality, treat for 10-14 days. # Reasonable to step down to PO therapy to complete course, if clinically appropriate
Follow Up
• Improvement in symptoms can usually be expected in 48-72 hours
• Ask about systemic symptoms (or factors concerning for pyelonephritis, including nausea and vomiting)
• Repeat urine C&S after completion of therapy generally not recommended unless treatment failure
▫ (or pregnant patients, for whom ongoing screening and treatment of ASB is indicated)
if symptoms are gone bbut bac is still there, creating pressure to treat it
Clinical Case
• JS is a 45 year old ♀ who presents to your pharmacy requesting treatment for what she suspects is a urinary tract infection. She states that she has a burning sensation when she urinates and also notes that she feels like she has to “go all the time”. On examination, her BP is 140/90, HR 80, RR 20, O2
sat 99% RA, temperature 37.2ºC. Her home
medications include candesartan, metformin, vitamin D, and citalopram and she does not have any medication allergies.
▫ What is your approach to this patient?
have they experienced it before, how recently?
back or flank pain, nausea/vomiting
vaginal discharge, painful intercourse
most STIs are asymptomatic in females
ask for how well diabetes control is good or not
if good -> uncomp cystitis
Nitrofurantoin monohydrate/macrocrystals 100 mg po BID x 5 days
Clinical Case #2
• BR is a 68 year old ♂ who presents to your pharmacy with a prescription from his physician for amoxicillin-clavulanate 500 mg PO TID x 10 days. He states that it is for an “infection in his bladder”. You
check Netcare and see that there was a urine culture from a couple days ago that grew E. coli which is susceptible to amoxicillinclavulanate, cephalexin, gentamicin, and nitrofurantoin; and
resistant to ampicillin and TMP-SMX.
rule out TMP-SMX (resistant)
nitrfurantoin –> not used as much for males
cephalexin –> narrowest spectrum
Pregnant Patients – Empiric Treatment
Cystitis
• Nitrofurantoin 50-100 mg po QID (or Macrobid 100 mg BID) x 7 days
(not to be used at term)
• Cephalexin 250-500 mg po QID x 7 days
• Cefixime 400 mg po once daily x 7 days
• Fosfomycin 3 g po x 1 dose
• TMP/SMX i DS tab po BID x 7 days (not to be used in 1st or 3rd trimester)
Post-treatment (1 wk) urine C&S recommended followed by monthly follow-up cultures during remainder of pregnancy
