CRNA Regional Anesthesia and Nerve Blocks

Question 1

What dermatomal level of spinal anesthesia is typically required for a cesarean section?

Accepted Answer

T4

Answer

T6

Answer

T8

Answer

T10

Question 2

Which of the following is an absolute contraindication to neuraxial anesthesia?

Accepted Answer

Infection at the intended injection site

Answer

Patient anxiety about needles

Answer

Prior lumbar spine surgery

Answer

Mild thrombocytopenia (platelets 80,000)

Question 3

Which local anesthetic is MOST associated with refractory cardiac toxicity and is therefore used at lower concentrations for epidural anesthesia?

Accepted Answer

Bupivacaine

Answer

Lidocaine

Answer

Chloroprocaine

Answer

Mepivacaine

Question 4

The standard epidural test dose detects which two complications?

Accepted Answer

Intravascular injection and subarachnoid injection

Answer

Allergic reaction and subarachnoid injection

Answer

Epidural hematoma and intravascular injection

Answer

Total spinal and allergic reaction

Question 5

Which order correctly describes the sequence of nerve fiber blockade by local anesthetics from first to last?

Accepted Answer

Sympathetic → sensory → motor

Answer

Motor → sensory → sympathetic

Answer

Sensory → sympathetic → motor

Answer

Motor → sympathetic → sensory

Question 6

A patient receiving spinal anesthesia develops sudden hypotension and bradycardia. What is the MOST likely mechanism?

Accepted Answer

Sympathetic blockade causing venodilation and reduced preload

Answer

Anaphylaxis to the local anesthetic

Answer

Direct myocardial depression from the local anesthetic

Answer

Vagal response from patient anxiety

Question 7

What is the primary mechanism of action of local anesthetics?

Accepted Answer

Blockade of voltage-gated sodium channels preventing depolarization

Answer

Blockade of potassium channels preventing repolarization

Answer

Enhancement of GABA-A receptor chloride conductance

Answer

Inhibition of acetylcholinesterase at the neuromuscular junction