Urinary tract infection Flashcards
Presentation of UTI
dysuria, frequency and smelly urine
BUT can be unwell/failure to thrive or incontinence
Do ureters store urine?
no - constant trickle
How do the ureter enter the bladder?
at an angle
Significance of ureters entering bladder at an angle
as bladder fills up and pressure increases this closes off ureter and stops reflux of urine
4 normal urinary tract bacteriostatic propertier
prostatic secretions
anti-bacterial antibodies
free flow of urine through normal anatomy
low pH, high osmolarity and high ammonia
What part of urinary tract is sterile?
all of it apart from terminal urethra
2 commensal bacteria flora of terminal urethra
gut flora eg ecoli
skin - perineal
If a suprapubic aspirate is taken will this be sterile or not?
sterile
Is a urine specimen ever sterile?
NO -always atleast slightly contaminated by terminal urethra flora
Which part of urine will be most highly contaminated?
first few mls
Significance of MSSU
initial void discarded with most bacteria
still always present but flush out majority
How is MSSU interpreted?
microbiology - bacteria grow in log phase
dip slide method to count colonies and bacteria
time and temperature of MSSU incubation
24 hours 37 degrees
What number means an infection in culture?
10 to the power of 5
What does 10 to the power of 3/4 mean in culture?
probable infection if symptoms and 50% chance if no symptoms
What people are MSSU difficult to collect?
children and elderly