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SM Renal > Microbiology of Urinary Tract Infection > Flashcards

Microbiology of Urinary Tract Infection Flashcards

1
Q

What part of the renal tract is colonised by bacteria

A

The distal end of the urethra

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2
Q

What type of bacteria is found in the distal end of the urethra

A

Coliforms and enterococci from the large bowel

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3
Q

What is the definition of a UTI

A

The presence of micro-organisms in the urinary tract that are causing clinical infection

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4
Q

What is cystitis

A

Inflammation of the bladder that ay or may not be caused by an infection

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5
Q

What is a lower UTI

A

an infection that is confined to the bladder (cystitis)

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6
Q

What is an upper UTI

A

An infection involving the ureters +/ the kidneys (pyelonephritis)

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7
Q

Why is it important to determine whether the infection is upper or lower

A

Different antibiotics are used to treat different levels of the urinary tract

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8
Q

What is a complicated UTI

A

A UTI complicated by systemic sepsis or a urinary structural abnormality or stones

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9
Q

What patients are more likely to have bacteria in their urinary tract but not necessarily an infection

A

Patients with catheters or elderly patients

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10
Q

What is meant by bacteriuria

A

The presence of bacteria in the urine

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11
Q

Give 3 reasons that make women more susceptible to UTI than men

A

Short wide urethra
proximity of urehtra to anus is shorter
increased risk with sexual activity,
pregnancy (uterus presses down on the bladder resulting in incomplete emptying)

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12
Q

Ascending infection is more common. Describe how it occurs

A

Bowel organisms colonise the perineal skin. they travel to the lower end of the urethra, into the bladder, ureters and then kidneys

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13
Q

Describe how infection occurs from the blood

A

The patient has bacteraemia/ septicaemia from another focus of infection –> bacteria in blood –> seeded into kidney –> multiple small abscesses –> bacteria in urine

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14
Q

What organism is responsible for 70% of UTI

A

E Coli

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15
Q

What are almost all causal organisms

A

Gram negative bacilli

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16
Q

What are some other causal organisms

A

Coliforms
Klebstelle sp.
Enterobacter sp.
Proteus sp.

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17
Q

What is protest sp. associated with

A

the formation of stones (calculi)
They produce urease which changes urinary pH which causes precipitation of salts and this can result in the formation of stones

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18
Q

there are 2 common forms of Enterococcus spp.
Name them
What is more difficult to treat and why

A

Enterococcus faecalis and enterococcus faecium

Faecium is more difficult to treat as it is more resistant to antibiotics

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19
Q

What organism usually affects women of child bearing age

A

Staphylococcus saphrophyticus

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20
Q

What is pseudomonas aeruginosa associated with

A

UT instrumentation or catheters

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21
Q

What is the antibiotic that seems to be sensitive to pseudomonas aeruginosa.

What is the disadvantage of using it

A

Ciprofloxacin

Associated with C diff infection

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22
Q

How does pseudomonas aeroginosa behave differently to other coliforms

A

It grows aerobically

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23
Q

What are the signs and symptoms of a UTI

A

dysuria
frequency of urination
nocturia
haematuria

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24
Q

What are some signs of an upper urinary tract infection

A

fever
loin pain
rigors

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25
How is the best specimen collected
Wash perineum / urethral meatus with sterile saline (not antiseptic) Allow patient to pass first part in toilet. Collect second part which should have less organisms and not just urethral organisms Pass last urine in toilet
26
Why should antiseptic not be used to wash the perineum
It can inhibit bacteria growth which may affect lab results
27
What is the difficulty with bag urine collection
It is often contaminated with bowel flora | A negative culture result is more useful than a positive as it can exclude infection from the differential
28
What might a clinician do lift he bag urine is positive
Suprapubic aspirate of urine
29
How is urine collected from a catheter for culture
Take from a collection port - not the bag
30
What is the best container to collect urine for sending to the lab
``` Boricon container (red top) It contains the preservativeve boric acid which will stop bacteria multiplying for 24 hours ```
31
When might LEU be raised on dipstick
Catheterised patients
32
What organism does not give a positive nitrite test
Enterococci
33
If a patients urinalysis shows LEU, when should you send a sample
Only if they have signs and symptoms as well
34
What should we look for on microscopy of urine
Not done routinely but when we do we look for: presence of polymorphs (pus cells), bacteria +/- RBCs
35
When is a plate insignificant of a urine infection
10^3
36
When is a plate of urine definitive for UTI
10^5 organisms or more but usually only 1 organism shows huge numbers (not huge numbers of various organisms)
37
When might a urine plate be contaminated or show signs of an early UTI
10^4 organisms | Test should be repeated
38
What is the problem of using Kass's Criteria
It only applies to women of child bearing age
39
What is ESBL
Extended spectrum beta lactamase - this is an enzyme that breaks down the beta lactic rings in almost all cephalosporins and penicillins
40
Where is ESBL carried
on a plasmid
41
What are some antibiotics that may be useful for treating ESBL-producing bacteria
``` Nitrofurantoin - oral Pivemecillinam - oral Fosfomycin - oral Tmocillin-IV Meeropenem - IV Ertapenem -IV ```
42
What is though to be one of the causes for the increasing incidence of ESBL producing bacteria
Imported chickens - they contain antibiotic strains
43
What are carbapenemase- producing enterobacteriaceae (CPE)
``` Gram negative (coliform) bacilli that are resistant to meropenem --> basically resistant to all antibiotics This is the last choice antibiotic ```
44
Why did CPE become resistant
A lot of organisms are found in Asia. Uncontrolled use of antibiotics there
45
What are 4 ideal components of an antibiotic
Excreted in urine in high concentration Oral Inexpensive Few side effects
46
Why is trimethoprim the first line AB in women
It inhibits bacterial folic acid synthesis - a range of organisms can be treated
47
Why is trimethoprim contraindicated in the 1st trimester of pregnancy
It inhibits folate synthesis --> spinabifida is associated with low levels of folic acid in pregnancy
48
How can trimethorprim be given
As co-trimoxaxole (IV or oral)
49
When would nitrofurantoin be given
In lower uncomplicated UTI -
50
When should nitrofurantoin be avoided
Late pregnancy | Breastfeeding
51
Why can Nitrofurantoin only be used for uncomplicated lower UTI
It is only activated in the urine
52
Why should gentamicin be avoided in pregnancy
Risk of hearing problems and kidney problem in the fetus | VIIIth nerve damage - deafness and balance problems
53
How long should gentamicin be prescribed for
3 days only - not 3 doses
54
What is the main advantages of using pivmecillinam
Very beta-lactamase stable - high activity against very antibiotic-resistant coliforms that produce extended spectrum beta-lactamases (ESBLs) Less of a risk of C diff
55
When would Temocillin be used
It is useful for patients whose renal function is too poor for gentamicin but is not as effective
56
When is Cefalexin used
During pregnancy
57
What is co-amoxiclav made up of
amoxicillin and clavulanic acid
58
What does Ciprofloxacin do
Inhibit bacterial DNA gyros which prevents supercoiling of bacterial DNA
59
Who should not receive ciprofloxacin
Pregnant women or young children
60
What is the antibiotic of choice for a female lower UTI
Trimethoprim or nitrofurantoin oral 3 days
61
What is the antibiotic of choice for an uncatheterised male UTI
Trimethoprim or nitrofurantoin orally | 7 days
62
What is the antibiotic used for a complicated UTI or pyelonephritis (GP)
Co-amoxiclav or co-trimoxazole | 14 days
63
What is the antibiotic used for a complicated UTI or pyelonephritis (hospital)
Amoxicillin and gentamicin IV for 3 days Co-trimoxazole and gentamicin if penicillin allergic Stepdown as guided by antibiotic sensitivities
64
Why are pregnant women treated for asymptomatic bacteriuria but other patients are not
If pregnant women are left untreated, 20-30% progress to pyelonephritis This may lead to intra-uterine growth retardation or premature labour
65
What might help symptoms of bacterial cystitis / urethral syndrome
Alkalinising the urine may help

SM Renal (23 decks)

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