Regional Exams Flashcards
When using a nerve stimulator, the ____ electrode is placed on the patient and then _____ electrode is placed on the needle.
positive, negative
All of the following is true regarding a Pediatric Caudal blocks EXCEPT:
1.0ml/kg of 2% lidocaine
(correct dosing: Lidocaine 1.5-2% 15-20ml for LL or perineum block; max dosing 5mg/kg or with epi 7mg/kg; bupivacaine 3mg/kg)
Peds: 0.5-1.0ml/kg of .0125-0.25% bupivacaine (or ropivacaine) with or w/o epi — not lidocaine
WHich of the following blocks has the largest depth in regards to ultrasound
Anterior approach to the sciatic nerve (>10.0cm)
Which of the following is an absolute contraindication to neuraxial anesthesia (choose 2)
Bleeding diathesis
Increased intracranial pressure
How much LA to give with epidurals per segment
1-2 ml
Which of the following would be seen with Lidocaine toxicity level of 20mcg/ml
apnea
Which of the following are esters(i):
Procaine
Chloroprocaine
Which of the following is a normal Dibucaine number
80
Specific Receptor theory: (3)
- LA act by binding to specific receptors on Na channel
- Activation is direct, no change in cell membrane permeability
- Specific receptor site for LA in the Na channel which eliminates permeability of Na ions
Which of the following is NOT recommended in the treatment of PDPH:
Early ambulation
Which of the following is a safe dose in Spinals
20 mcg Fentanyl
What membrane is punctured during caudal blocks
sacrococcygeal membrane
Which local anesthetic has the fastest onset and pka around 9.1
Chloroprocaine
Which of the following are least sensitive to action of LA?
C Fibers
2-3 nodes of Ranvier must be blocked to stop nerve conduction is true for what?
Myelinated axons
Relative Refractory period is..
Period where a larger than normal stimulus can elicit an action potential
Lateral Rectus is controlled by what cranial nerve?
Abducens (IV)
LR6 SO4 R3
Nonionized form of a weak base is the ____ and the ionized form is the _____
Base, conjugate acid
When using peripheral nerve stimulation, which is correct?
As needle approaches the sheath, continue to decrease the mA to maintain desired muscle response
Which of the following is a landmark in the use of caudal blocks represented by a depression
Sacral hiatus
Which of the following will be lost LAST in spinals:
Motor
*“ATM”:
ATP - autonomic, temp, pain
TP - touch, pressure
MVP - motor, vibratory, proprioception
Represents highest to lowest blood flows affecting duration of action (not sure if that was the question)
Intraarterial/intravenous > tracheal> intercostal> caudal> paracervical > epidural > brachial plexus> sciatic/subarachnoid/femoral> subq
Which of the following is true regarding metabolism
Mepivacaine > bupivacaine
[P > L> M > R > B]
Which is true regarding fetal ion trapping
A. The lower the fetal pka the greater the amount of LA
B. The higher the fetal pka the greater the amount of LA form in the fetus
C. The lower the fetal ph the greater the amount of LA form in the fetus
D. The lower the fetal pka the greater the amount of LA form in. the fetus
C. The lower the fetal ph the greater the amount of LA form in the fetus
Sodium Ceto has a pKa of _8.5__ and is injected into a patient with a pH of 7.4. Which of the following is true:
more/less than 50% is ionized/unionized..
More than 50% unionized (weak acids bind to positive ions, making Sodium Ceto a weak acid)
Which of the following is true regarding the inactivation of the sodium channel with LA:
The ionized form is responsible for binding to the receptor in the sodium channel
All of the following are true regarding neuraxial blockade in the setting of anticoagulant therapy EXCEPT?
Prophylactic minidose of subcutaneous heparin is a contraindication
Where do local anesthetics work after injection to the intrathecal space?
Spinal nerve roots
Spinal cord
What area is the largest space for spinal anesthesia?
L5-S1
What is the most influential factor for spinal anesthesia?
Dosage of LA
Epidural hydrostatic pressure is…?
negative?
Weak bases become more ____ as pH increases
Nonionized
Sodium permeability decreases in the downstroke of the AP due to:
Inactivation of the Na channel
Most important factor regarding duration of action with LA:
Degree of Protein binding
Locate the adductor magnus muscle
See Pic
Locate the peroneal nerve
See Pic
All of the following are complications of the Supraclavicular approach to the brachial plexus
EXCEPT:
Superior laryngeal n. Block
Which of the following does not correspond to it’s surgical indication?
Axillary approach - procedures of the upper arm and below the elbow
(Just blocks
procedures up to the elbow)
The interscalene approach requires supplementation of:
Ulnar nerve block
All of the following are true regarding the brachial plexus except:
8 Trunks
there are 3 trunks
Which of the following nerves provides innervation to cricothyroid?
External Laryngeal Nerve (Picture ID)
C5 is the first nerve, on the arm which is the last root of the brachial plexus?
T1 (Picture ID)
does anyone remember which picture this was?? let Amanda know. ty!
Major contributor to the phrenic nerve from cervical plexus?
C4 70%
Nerves blocked with popliteal?
a. Common peroneal
b. Tibial
All true about nerve plexus Except?
1 sacral
8 cervical nerves, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal = 31 pairs of spinal nerves
Interscalene muscle
Needle is inserted transverse towards C6- medially- motor response elicited deltoid-
after aspiration 20-30ml of local anesthetic was injected.
Least likely to be blocked with axillary approach?
Musculocutaneous
Bier block local?
0.5 % lido
All true of Bier block Except?
Wrap in Esmarch after tourniquet application
Most serious complication of retrobulbar
Apnea and obtunded
Not true about Lateral Femoral Cutaneous?
Sensory and motor innervation
only sensory
All of the following regarding superior laryngeal nerve block are true EXCEPT:
If you aspirate air it means you are too shallow and you should advance the needle
(correct- it means you are too DEEP if you aspirate air, not too shallow)
Which of the following is not true:
Brachial plexus is formed from posterior divisions of ____
**Cervial, brachial, and lumbar plexus are all formed by the ANTERIOR divisions of corresponding spinal nerves.
Sacral plexus - formed by the roots (posterior roots form ganglia)
Highest incidence of causing a pneumothorax out of all the brachial plexus blocks:
Supraclavicular
Nerve missed during supraclavicular/ interscalene?
Ulnar
Which of the following nerves is anterior to the axillary artery
Median
All of the following are true regarding digital nerve blocks except:
LA containing epinephrine
Which of the following is true regarding their relation to the axillary artery
Ulnar nerve - posterior to the axillary artery
Time limit for tourniquet use with digital nerve blocks if indicated
15 min
Time limit for tourniquet use with digital nerve blocks if indicated
15 min
Indicates intraneural injection
< 0.2 mA
TAP block landmarks consist of all these EXCEPT:
Transverse oblique
“TIE”
Transversus abdominis
Internal oblique
External oblique
most commonly used in conjunction with sciatic (popliteal) block to provide anesthesia/analgesia below the knee?
or
Not part of the sciatic system/plexus OR most medial portion of the femoral n.
Saphenous
TAP block least common complication
Intra arterial injection
All are correct of musculocutaneous Except?
Inject 20 -25 around the nerve
should be 5-10 mL for musculocutaneous block
Which is the cranial nerve supplying the blue portion?
See Pic
trigeminal
Cranial n. Supplying yellow portion
glossopharyngeal
Cranial n. Supplying pink portion
vagus
Specific glossopharyngeal nerves that are of interest. Provides sensation to the mucosa.
(Identify on diagram)
pharyngeal nerve
Nerve blocked when aiming posteriorly to the lateral malleolus
Sural
Cervical sympathetic ganglion
See Pic
SLN
See Pic
External Larygeal branch
See Pic
*Innominate Artery - different image tho
See Pic
Which area is innervated by the last nerve in the brachial plexus?
T1 (E) - light pink area
medial cutaneous nerve
C8 innervates which section?
B - orange area /Ulnar Nerve
thumb to pinky: 6, 7, 8
Least risk of a pneumothorax?
Axillary
Not true with superior laryngeal nerve block?
It is a single sided injection → this is a DOUBLE sided injection!