(P) Versatrek Training Flashcards
video lecture-based
TOF. VERSATREK is an automated blood culture system.
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versaTREK is manufactured by?
ThermoFischer Scientific
PRINCIPLES OF AUTOMATED BLOOD CULTURE MACHINE (3)
● Colorimetric Technology
● Fluoreescent Technology
● Pressure Change Detection
- organisms grow in media and produce carbon dioxide (CO2)
- CO2 passes through semi-permeable membrane located at the bottom of the blood culture bottle
- sensor changes from green to yellow
- Positive butt of culture bottle will be detected by the blood culture analyzer
COLORIMETRIC TECHNOLOGY
COLORIMETRIC TECHNOLOGY
It is based on what chemistry?
Growth chemistry
COLORIMETRIC TECHNOLOGY
Indicators:
- Green
- Yellow
- Negative
- Positive
- Organism metabolic activity releases CO2
- Carbon dioxide reacts with dye in vial sensor located at the bottom of the blood culture bottle
- LED-activated fluorescent material in sensor.
- Photodetector reads fluorescence
- Raw data from detector is analyzed by row board
- And positivity analysis is performed
- Positive vial is announced by audible alert, on screen indications, and the Positive Vial system indicator.
FLUORESCENT TECHNOLOGY
FLUORESCENT TECHNOLOGY
This reacts with dye in vial sensor located at the
bottom of the blood culture bottle?
CO2
FLUORESCENT TECHNOLOGY
modulated by dye in the sensor
Fluorescence
FLUORESCENT TECHNOLOGY
This reads the fluorescence
Photodetector
FLUORESCENT TECHNOLOGY
Positive vial is announced by audible alert, on screen
indications, and the?
Positive Vial system indicator
- This principle is utilized by VersaTREK Technology
- During metabolism, microorganisms produce and/or consume gases (CO2, H2, O2, N2, etc.)
PRESSURE CHANGE DETECTION
PRESSURE CHANGE DETECTION
They measure these changes in pressure in the
headspace of inoculated bottles over time to determine positivity
VersaTREK
TOF. Production decreases pressure while consumption increases.
F (reverse)
PRESSURE CHANGE DETECTION
No CO2 limitations in VersaTREK’s TI
itz a technology
Comprehensive Detection Technology (CDT)
Consumption of oxygen is decreased in pressure followed by constant pressure which gradually decreases, then the rapid or sharp increase of pressure that is now called
carbon dioxide production
TOF. When microbes may not produce a sufficient amount of CO2, this can become a problem for colorimetric or fluorescence technology.
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- Connector provides the link (via a recessed probe) for headspace pressure measurement
- Allows dissipation of gases produced during metabolism
VERSATREK SAFETY - CONNECTOR
VERSATREK SAFETY - CONNECTOR
a component in the connector prevents
aerosol escape
Hydrophobic membrane
- A major advantage of VersaTREK Technology by continuously stirring the culture media in the bottle
- Proven to be 2 hours faster than the stir bar
VORTEXING
Author of Preliminary Development and Verification of a New Agitation Method for the ESP Culture Technology
N.M Sullican and D. Fett
ESP Culture Technology
TOF. These data show that the stir bar agitation method is a very effective method when used with the ESP technology
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ORGANISMS THAT SIGNAL ON GAS PRODUCTION
● Staphylococcus aureus
● Staphylococcus epidermidis
● Staphylococcus pneumoniae
● Enterococcus faecalis
● Escherichia coli
● Candida albicans
● Klebsiella pneumoniae
SSSEECK
ORGANISMS THAT SIGNAL ON GAS CONSUMPTION
● Brucella suis
● Helicobacter spp.
● Nocardia spp.
● Campylobacter spp.
● Brevundimonas vesicularis
● Rhodococcus equi
● Trichoporum beigelli