L18: Cystitis + Pyelonephritis Flashcards
Upper tract infections
Pyelonephritis
Lower tract infections (3)
- Cystitis
- Prostatitis
- Urethritis
in men aged 20-50, most UTIs are
Urethritis
Prostatitis
In women aged 20-50, most UTIs are
cystitis
pyelonephritis
how do 95% of UTIs occur
ascending bacterial infection
remaining are hematogenous
Causes of most UTIs
E coli
UTI risk factors: reduced urine flow
- Urine outflow obstruction
- inadequate fluid intake
- neurogenic bladder
UTI risk factors: promote colonization
- sex
- spermicide
- recent abx
UTI risk factors: facilitate ascent
- Catheters
- Urinary incontinence
- Fecal incontinence
Acute complicated UTI
acute UTI + extension of infection beyond the bladder
what symptoms might suggest a UTI is complicated?
Fever > 99.9 Chills, rigor, fatigue/malaise Flank pain CVA tenderness Pelvic or perineal pain (men)
who is more at risk for complicated UTI
Pregnant women Men Comorbidities Immunocompromised Urologic abnormalities
Irritative voiding symptoms of acute cystitis
*** Dysuria Urinary frequency Urinary urgency ***
+/- hematuria, suprapubic discomfort
Physical exam of acute simple cystitis
TYPICALLY NORMAL
Women +/- suprapubic tenderness
Urine dipstick acute simple cystitis
+ Leukocyte esterase and nitrites
Urine microscopy acute simple cystitis
Pyuria: >10 leukoctyes/micrL
Bacteriuria
When to do a urine culture for acute simple cystitis
Atypical presentation Diagnosis uncertain Suspect complicated Sx do not resolve/recur Suspect abx resistance Special populations
Diagnostic urine culture for UTI
> 1000 CFU
Diagnostic urine culture in women with typical UTI sx
> 100 CFU
Symptomatic relief for UTI
Phenazopyridine (pyridium)
2 days
When to avoid TMP-SMX for acute simple cystitis
more than 20% of local e coli are resistant
When to avoid nitrofurantoin and fosfomycin
early pyelonephritis
due to low renal concentrations
3 primary therapies for acute simple cystitis
- Nitrofurantoin 100 mg po BID 5 days
- TMP-SMX 160/800 mg po BID 3 days
- Fosfomycin 3 g PO single dose
- men: 7 days
- comorbidies, immunocompromised, urologic abnormalities: 1-2 weeks
Alternative therapies for acute simple cystitis
Beta-lactams (augmentin, cefdinir)
Fluoroquinolones (ciprofloxacin, levaquin)
When can nitrofurantoin and TMP-SMX be used in pregnant women
“use/avoidance based on trimester”
Options for pregnant women
Augmentent
Cephalexin
Cefpodoxime
Fosfomycin
DON’T give to pregnant women
Fluoroquinolones (ciprofloxacin, levaquin)
**
who needs follow up cultures in acute simple cystitis or pyelonephritis
pregnant women
symptoms do not resolve on abx
pyelonephritis cause
ascent of bacteria up ureters from bladder to the kidneys
Symptoms of pyelonephritis
UTI symptoms Flank pain Fever, chills, malaise GI: N/V/A, abdominal pain Fever CVA tenderness
what differentiates pyelonephritis from UTI on UA?
same findings except pyelonephritis has white blood cells casts