Abstract book 6th RMS 16.indd

vitro crystallization study enabling the
specification of kinetic and thermodynamic
conditions of formation and growth of
crystalline calcium phosphate
species. We used wild Algerian medicinal
plant extracts which prevent, slow down or
reduce crystallization phases.
Methods: We chose the classical model
for the study of phosphate crystallization
without inhibitor and with it, in order
to assess the inhibiting capacity of any
chemical species used. The precipitation
of the solid phase of phosphates from
artificial urine was studied . The crystal size
development was monitored by polarized
microscopy at different time intervals.
After crystallization time, the mixture was
filtered, the recovered dried precipitates
were analysed by FTIR spectroscopy and
X-rays diffraction technique and chemical
analysis.
Results: In the absence of plant extract
inhibitors (Acacia raddiana, Citrullus
colocynthis, Rhus tripartite), the
crystallization of phosphates led to the
formation of struvite and amorphous
carbonated calcium phosphates (ACCP),
after 6 hours. In presence of lower
concentrations of plant extract inhibitor,
inhibition was partial. The addition of 1 ml
of plant extract to the mixture decreases
the size of crystal. After 4 hours the size
of crystals stabilized at 20.67 μm. The
complete disappearance of struvite crystals
was obtained after addition of 10mL of
plant extract inhibitor. Only Pentahydrated
octocalcium phosphates (POP) and ACCP
were formed. In the presence of other
inhibitor extract plant, the inhibition of
struvite growth and aggregation increased.
The addition of up to a volume of 20 mL
of the second inhibitor resulted in total
inhibition and crystalline transformation
of the ACCP into carbapatite (CA).
Phosphate compounds encountered in
urine can be dangerous and the use of
inhibitors to prevent, slow down or reduce
crystallization phases might be very helpful.
Conclusion: In this investigation, plant
extracts proved to be good inhibitors.
Their effect varies according to solution pH
but they are more efficient in less acidic or
neutral urine than in alkaline one.
Hall E Session 4
Anesthesia
380
Update in Thoracic Anaesthesia
Omar Al-Rawi MD (UK)
Changes in medical technology, patients’
demographics and surgical philosophy have
resulted in older, sicker patients presenting
for thoracic surgery. Simultaneously, a
global economic downturn has mandated
the development of new strategies to
reduce hospital stay. One successful
strategy has been the use of minimally
invasive techniques for a variety of thoracic
surgical procedures. The move to less
invasive surgery and enhanced recovery
has provided thoracic anaesthesia with
the opportunity to evolve to meet these
new challenges. Changes to techniques of
one lung isolation, management of intraoperative
of one lung ventilation and postoperative
analgesia will all be described.
381
Central Neraxial Ultrasound
(Ultrasound of the Spine for Epidural
Placement)
Steven R. Clendenen MD (USA)
Spinal anesthesia and epidural needle
insertion and paravertebral block is usually
a blind technique where the rate of
adverse events depends on the experience
of the operator. Ultrasound can be used to
guide placement of an epidural catheters,
spinal anesthesia and paravertebral block
placement. The ultrasound sonoanatomy
and techniques of cenrtral neuraxial and
paravertebral blocks will be described.
382
Where We’ve Come From & Where
are We Going?
Moawiya Ababneh MD (Jordan)
This lecture will highlight the history
of Anesthesia in Jordan, The Jordan
Medical Council, the Anesthesia Society,
anesthetists Shortage, Current problems
and proposals to solve them.
www.jrms.gov.jo
188