Does Ultrasound Improve Procedural Time in the Lateral Popliteal Approach to the Sciatic Nerve in Obese Patients

This is a single blinded randomized controlled trial comparing the procedural time for a
sciatic nerve block via the lateral popliteal approach using ultrasound compared with nerve
stimulation.

54 patients will be randomly selected to determine if the patient will receive their sciatic
block using an ultrasound or a nerve stimulation technique.

Patients chosen to receive the ultrasound technique will have their blocks performed by
attending regional anesthesiologist who are experts at ultrasound guided sciatic nerve
blocks via the lateral popliteal approach.

Patients chosen to receive the nerve stimulation technique will have their blocks performed
by attending regional anesthesiologist who are experts at nerve stimulation sciatic nerve
blocks via the lateral popliteal approach.

Blinding:

Both the patient and the person assessing the block will be blinded to the group allocation.
The highest pain score during the procedure will be obtained by an observer blinded to the
group allocation. The time taken for the block, the number of skin punctures and number of
passes will be recorded by a person who is not performing the block.

All popliteal blocks will be performed preoperatively by 1 of 4 staff anesthesiologists with
substantial expertise in both peripheral nerve localization techniques. Patients will be in
the supine position with a bolster below the calf keeping the tibia parallel to the floor.
This allows placement of the ultrasound probe in the popliteal region in the ultrasound
group. An ultrasound machine and a nerve stimulator will be set up in both groups and the
patient will be blinded on the technique used for nerve localization. The ultrasound machine
will be turned on and placed perpendicular to the anesthesiologist performing the block on
the opposite side of the leg being blocked. The nerve stimulator will be turned on and a
grounding lead place on the side of the leg being blocked for both groups. The
anesthesiologist performing the block will be given the allocation only after the set up of
both systems and just prior to commencement of the block. The patient will be sedated with
2-5mg midazolam and 50-200 ug fentanyl to achieve anxiolysis while maintaining verbal
contact. A screen will be set up to prevent the patient or the person assessing the block
from seeing the block or the ultrasound screen.

Nerve stimulation group:

Time of block performance starts from first palpation of landmarks to the final injection of
local anesthetics. The site of needle insertion was identified and marked (Surgical Skin
Marker VX100; Vio Healthcare, Hailsham, East Sussex, UK) as the groove between the biceps
femoris and vastus lateralis muscle 10 cm above the top of the patella. (4) A 22G 80mm
(SonoPlex Stim Cannula Pajunk Medizintechnologie Germany) insulated needle is inserted with
a nerve stimulator set at 1.0mA. The needle is inserted perpendicular to the skin and
redirected at a 30 degree angle relative to the horizontal plane. The needle depth is
estimated using the midpoint of the thigh and the tangential trajectory of 30 degrees. If
plantar flexion is elicited, the nerve stimulator is dialed down to produce a stimulation at
0.4mA or less. If stimulation persists at 0.2mA, the needle is withdrawn until stimulation
disappears at 0.2mA but persists below 0.4mA. If dorsiflexion is elicited, the needle is
inserted deeper to achieve plantarflexion. Internal rotation of the leg may be help in
achieving the angulation.(4) If the needle does not achieve any stimulation, the needle is
redirected in 5 degree increments between a 15 to 45 degree trajectory. (5) When the needle
is in the correct position, 20 cc of 1.5% mepivacaine is injected in 5 cc increments over 30
seconds. Aspiration for blood is performed before injection and after every 5 cc of
injection. Injection is stopped if blood is aspirated or if there is pain on injection. The
needle is then repositioned or the block abandoned on the discretion of the anesthesiologist
doing the block. However, blood aspiration or pain will be noted.

Ultrasound group

Time of block performance starts from the first antiseptic skin prep on the patient to the
final injection of local anesthetics. The lateral and posterior portion of the thigh will be
prepped with chlorhexidine. The ultrasound probe is covered with a sterile dressing and
placed in the popliteal fossa close to the popliteal crease. The tibial and common peroneal
nerve is identified. A long axis slide in the cephalad direction is performed to identify
the unity of the tibial and common peroneal nerve into the sciatic nerve. The 28 mm high
frequency ultrasound probe is then then moved 2 or more cm cephalad and this is the level of
the needle insertion. The 22G 80mm (SonoPlex Stim Cannula Pajunk Medizintechnologie Germany)
needle is inserted in-plane from the lateral thigh to approach the sciatic nerve. (6) 20 cc
of 1.5% mepivacaine is injected in 5 cc increments over 30 seconds. Aspiration for blood is
performed before injection and after every 5 cc of injection. Circumferential spread of
local anesthetics around the nerve is sought. The needle is redirected as required to
achieve this goal. Injection is stopped if blood is aspirated or if there is pain on
injection. The needle is then repositioned or the block abandoned on the discretion of the
anesthesiologist doing the block. However, blood aspiration or pain will be noted.

Block Evaluation After the placement of the block, the tibial (bottom of the foot) and
common peroneal (top of the foot) will be assessed for motor and sensory loss. Motor loss
will be graded as such: 0= no motor strength; 1 = some loss, 2 = full strength. using ice in
a PVC glove every 5 minutes for 30 minutes. Sensory loss will be graded as such: 0 = no
sensation to ice; 1 = some loss; 2= complete sensation to ice. If the block does not produce
complete sensory loss in both distribution within 30 minutes, the block is defined as a
failure. It is up to the discretion of the anesthesiologist if he wishes to perform a rescue
block or supplement with local field block or to perform a general anesthesia.

Other Evaluation Patients will be followed up in recovery to evaluate if general anesthetic
or supplemental local anesthetic by the surgeon is required in the sciatic distribution for
surgery.

Patients will be followed up within 72 hours via a telephone interview with regards to signs
and symptoms of infection and nerve damage.

Inclusion Criteria:

- ASA 1-3

- Age 18 and above

- BMI >30

- Operations requiring lateral popliteal approach to the sciatic nerve block

Exclusion Criteria:

- Diabetes

- Injection site deformities

- infection at the injection site

- existing peripheral neuropathy

- allergy to LA agents

- Dementia or communication problems

- Inability to understand or discern temperature difference

- Any other contraindication to lower limb peripheral nerve block