Fundamentals of Laparoscopic Surgery, FLS
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Describe a monopolar energy -electrode > tissue > patient > return pad
route?
Describe a bipolar energy -electrode > tissue > electrode
route? --> electrodes shaped like forceps
-cut
Three modes of monopolar
-coagulation
devices?
-blending
Describe the mechanism of -heats tissue quickly > converts water to steam > causes cells to
monopolar cutting? explode
Describe the mechanism of -rapid surface heating
monopolar coagulation?
What is current diversion and -when current passes through unintentional tissue following the
when does it occur? path of least resistance
-inspect insulation carefully
-use lowest possible power setting
What precautions should -use lowest voltage waveform possible
surgeons take when utilizing -use brief intermittent activation vs. prolonged activation
laparoscopy? -do not active unless in close proximity to target tissue
-do not activate in close proximity to another instrument
-use bipolar instrumentation when possible
-the transfer of energy within an electrical network or between
What is capacitative coupling? distant networks by means of displacement current between
circuit nodes, induced by the electric field
-the the transfer of electrical energy by means of physical
What is direct coupling? contact via a conductive medium (such as between two
instruments)
When is a narrow return circuit -when a monopolar instrument comes into contact with a ligated
formed? tissue
, Bipolar instruments can seal -7 mm
vessels up to what diameter?
-inadvertent thermal injury
Hazards of using bipolar
-inadvertent cutting of patent before adequate sealing
instruments?
-improper device function if metal is contained within the jaws
The harmonic is an example of -piezoelectric transducer
what type of device?
The use of all plastic or all metal -capacitative coupling
trocars can avoid which
problem during electrosurgery?
Surgeons should have their arms -30 degrees
how many degrees away from
their body?
Elbows should be flexed -60 to 120 degrees
between...?
Consideration for patients on -may need stress dosing
steroids or immunosuppressive
drugs?
When should warfarin be -three days
discontinued before surgery?
Any proof that NSAIDs need to -no
be discontinued before
surgery?
ASA class one? -no disturbance
ASA class two? -mild to moderate systemic disease
ASA class three? -severe systemic disease
What patients may not be -ASA 4 and 5
suitable for LSC surgery?
How long should trocars be in -greater than 100 mm
obsese patients?
Approaches to minimizing -elevating abdominal wall
complications during entry in -place veress near costal margin
thin patients? -use hassan open approach or direct entry
-hypovolemic shock
Absolute contraindications to -lack of training
laparoscopy? -lack of institutional support
-can't tolerate laparotomy
-inability to tolerate general anesthesia
-long-standing peritonitis
Relative contraindications to
-large abdominal or pelvic mass
laparoscopy?
-massive incarcerated ventral and inguinal hernias
-severe cardiopulmonary disease
-gallbladder cancer
-portal HTN
Contraindications to LSC
-cirrhosis
cholecystectomy?
-acute cholecystitis
-mirizzi syndrome