Elimination & Detox 2: Infections of the UT Flashcards
WHAT determines WHETHER a LOWER UT INFECTION will OCCUR?
what 2 FACTORS play a role in this? describe them?
the BACTERIAL GENE EXPRESSION determines whether BACTERIA can COLONIZE ON BLADDER & cause CLINICAL DZ
2 factors…
1. FITNESS FACTORS = promote COMMENSALISM
2. VIRULENCE FACTORS = dictate INFECTION SEVERITY
bacteria EVOLVE by INCREASING ___ or ___ to…
FITNESS, VIRULENCE to CONSTANTLY ADAPT to CHANGES within their MICROENVIRONMENT
bacteria with HIGH FITNESS are COMMONLY FOUND IN ___ infections that also have DECREASED ___ potential
CHRONIC, VIRLUENCE
ADHESION MOLECULES..
= definition in relation to UT
= produced by BACTERIA and allow them to BIND AFFINITIVELY to DIFFERENT AREAS OF URINARY TRACT
UROPATHOGENIC E. COLI (UPEC)
express __ ____ ____ which BIND TARGETS on _____
could ALSO express ____ ____ that BIND RECEPTORS in ____ ____ ___
can cause WHAT dz?
express TYPE I FIMBRIAE which BIND TARGETS on UROEPITHELIUM
could ALSO express P FIMBRIAE which BIND RECEPTORS in UPPER URINARY TRACT
can cause PYELONEPHRITIS
MOST GRAM-____ organisms express similar ___ molecules with HIGH AFFINITY for ___ ___
NEGATIVE, ADHESION, KIDNEY TISSUE
ASYMPTOMATIC or SUBCLINICAL BACTERIURIA…
this IS NOT A DEFINITION FOR… (2)
= definition
NOT A DEFINITION FOR UTI & DOES NOT MEAN that UTI WILL NOT OCCUR
= BACTIURIA WITHOUT LOWER URINARY TRACT SIGNS
6 LOWER URINARY TRACT SIGNS?
helps
- CAUDAL ABDOMINAL PAIN
- PERIURIA (urinating OUTSIDE litterbox)
- POLLAKIURIA
- DYSURIA
- HEMATURIA
- MALODOROUS URINE
UNCOMPLICATED or SIMPLE UTIs…
how OFTEN do these occur?
what 2 patients are EXCEPTIONS & why?
how OFTEN? = occurs NO MORE THAN ONCE every 6 MONTHS in an OTHERWISE HEALTHY DOG
2 EXCEPTIONS? –> DO NOT FOLLOW THIS RULE
- CATS –> COMMONLY DEVELOP TRUE UTIs with CONCURRENT SYSTEMIC DZ
- INTACT MALE DOGS –> can have RECURRENT PROSTATITIS
COMPLICATED UTIs…
3 types?
- PERSISTENT
- RELAPSE
- REINFECTION
PERSISTENT (REFRACTORY) COMPLICATED URINARY TRACT INFECTIONS
= basic definition?
what are 3 things this could POSSIBLY INDICATE?
overall, if we SUSPECT this dz, we should SCREEN FOR __ __, including… (3)
= with APPROPRIATE ANTIMICROBIAL THERAPY, we have FAILED TO STERILIZE URINE
indicates that…
1. BACTERIA has DEVELOPED RESISTANCE during TREATMENT
- PATIENT is IMMUNOCOMPROMISED so UNABLE TO CLEAR INFECTION
- we HAVE NOT ACHIEVE the URINARY CONCENTRATION of ANTIBIOTIC to INHIBIT BACTERIAL GROWTH
if we SUSPECT PERSISTENT (REFRACTORY) UTI, should SCREEN for SYSTEMIC DZ
1. GI DZ
2. FUNCTION of IMMUNE SYSTEM
3. HEPATIC/RENAL systems
give 4 reasons as to why ___ (___) URINARY TRACT INFECTIONS can occur due to INABILITY TO REACH URINARY CONCENTRATION of ANTIBIOTIC necessary to INHIBIT BACTERIAL GROWTH?
PERSISTENT (REFRACTORY)
- DECREASED INTESTINAL ABSORPTION from GI DZ
- ALTERED PERFUSION of INFECTED TISSUES, so ANTIBIOTIC CANNOT REACH CONCERNED AREA
- ALTERED DRUG METABOLISM from CONCURRENT DZ
- REDUCED URINARY CONCENTRATING DZ (such as TUBULAR DYSFUNCTION)
RELAPSE COMPLICATED URINARY TRACT INFECTION
= definition
what 5 AREAS of the UT can contribute to this?
alternatively, what TRAIT can CERTAIN BACTERIA have that can allow for this/how?
= urine is INITIALLY CLEARED of INFECTION but BACTERIAL RESERVOIRS REMAIN so that RECOLONIZATION w/ SAME ORGANISMS can occur in DAYS TO WEEKS after recovery
areas of UT that can HARBOR bacterial reservoirs…
1. KIDNEYS
2. PROSTATE
3. UROLITHS
4. VAGINA
5. UROTHELIUM
certain BACTERIA can MOVE INTRACELLULARLY during INFECTION & FORM QUIESCENT INTRACELLULAR RESERVOIRS (QIC) that can LATER RE-SEED THE BLADDER
REINFECTION COMPLICATED URINARY TRACT INFECTION…
= definition
this is DIFFICULT to DIFFERENTIATE from ____ infection, so we should perform a ____ ____, which includes.. (3)
= ALTERATION to HOST DEFENSES allow for NEW BACTERIAL STRAINS to COLONIZE BLADDER seen WEEKS to MONTHS after
this is DIFFICULT to DIFFERENTIATE from RELAPSE infection, so we should perform a SYSTEMIC EVALUATION…
- look at EXTERNAL GENITALIA (recessed vulva)
- look for URINE RETENTION
- DIAGNOSTIC IMAGING or CYSTOSCOPY to EVALUATE LOWER UT
what is the GOLD STANDARD DIAGNOSTIC for LOWER URINARY TRACT INFECTIONS?
this is a ____ ____ that is able to IDENTIFY the ____ ___ & ____ ___
however, this does NOT help distinguish between ____ & ___, so we can look to use ____ for SUPPORT
AEROBIC CULTURE
this is a QUANTITATIVE CULTURE that is able to IDENTIFY the INFECTING ORGANISM & COLONY COUNT
however, this does NOT help distinguish between SUBCLINICAL BACTERIURIA & TRUE UTI, so we can look to use SEDIMENT for SUPPORT (like INFLAMMATION)
URINE CULTURE & SEDIMENT are AFFECTED BY… (2)
give 2 examples of what can happen?
AFFECTED by…
1. URINE STORAGE
2. TIME TO PROCESSING
2 examples?
1. bacteria CAN OVERLY PROLIFERATE
2. bacteria can DIE if SAMPLES LEFT UN-REFRIGERATED
when DIFFERENTIATING between URINE CONTAMINATION with BACTERIA & COLONIZATION as result of UTI… (2)
- consider URINE COLLECTION & COLONY COUNT
- look on SEDIMENT for CONCURRENT PYRIA that’s SUGGESTIVE OF INFECTION even if NO CLINICAL SIGNS
AEROBIC CULTURE for UTI…
GROWTH is usually apparent within ___-____ __ of ____ GENERALLY
what 2 BACTERIA can TAKE LONGER? what’s the range?
GRAM-___ are MOST COMMONLY ISOLATED, such as ___ ____
18-24 hours of INCUBATION GENERALLY, some can take longer!
2 BACTERIA that TAKE LONGER?
1. C RENALE
2. MYCOPLASMA SPP
–> 4-7 DAYS
GRAM-NEGATIVE are MOST COMMONLY ISOLATED, such as E. COLI
SIGNIFICANT BACTERIURIA CUTOFF for…
–> CYSTOCENTESIS (1)
–> CATHETERIZED SAMPLE (2, one for males & females)
–> VOIDED SAMPLE (2, one for dogs & cats)
–> CYSTOCENTESIS = GREATER THAN or EQUAL TO 1,000 CFU/mL
–> CATHETERIZED SAMPLE
1. MALES = GREATER THAN or EQUAL TO 10,000 CFU/mL
2. FEMALES = GREATER THAN or EQUAL TO 100,000 CFU/mL
–> VOIDED SAMPLE (2, one for dogs & cats)
1. CATS = GREATER THAN or EQUAL TO 10,000 CFU/mL
2. DOGS = GREATER THAN or EQUAL TO 100,000 CFU/mL
TRUE/FALSE
if an animal has SUBCLINICAL BACTERIURIA, we are usually NOT using ANTIBIOTICS if NO LOWER UT SIGNS ARE PRESENT
TRUE
SIMPLE or UNCOMPLICATED UTI TREATMENT…
does it require URINE CULTURE?
GENERAL medication name & duration?
when is FURTHER INVESTIGATION required?
DOES NOT require URINE CULTURE, especially if IT’S ONLY THE FIRST TIME
GENERALLY, can give AMOXICILLIN/CLAVULANIC ACID or TMS for 3-5 DAYS
FURTHER INVESTIGATION needed if NO RESPONSE in 48 HOURS, so THEN TAKE CULTURE if not yet