Positioning and nerve injury 2 Flashcards

1
Q

Which nerve is MOST likely to be injured by an IV pole that presses against the dorsolateral aspect of the humerus?
a. median
b. radial
c. ulnar
d. axillary

A

b. radial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The radial nerve passes along the

A

spiral grove at the lateral aspect of the humerus (about three fingerbreadths above the lateral epicondyle)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Etiologies of radial nerve injury include

A

excessive cycling of the NIBG cuff
upper extremity tourniquet
external compression by an IV pole
sheets that are too tight (if the arms are tucked)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Radial nerve injury presents with

A

wrist drop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Long thoracic nerve injury presents with

A

a winged scapula

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Suprascapular nerve injury presents with

A

dull shoulder pain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The long thoracic nerve arises from

A

C5-C7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The long thoracic nerve innervates the

A

serratus anterior muscle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Long thoracic nerve injury can occur from

A

lateral position
trauma
preexisting neuropathy (possibly d/t a virus)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The suprascapular nerve innervatest he

A

supraspinatus and infraspinatus muscles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The suprascapular nerve is anchored between

A

the cervical spine and the suprascapular notch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Etiology of suprascapular nerve injury is

A

the patient in the lateral decubitus position rolls onto their dependent arm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Properly stabilizing the patient and placing a roll distal to the axilla may reduce the risk of

A

suprascapular nerve injury

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

A patient developed foot drop following a vaginal hysterectomy. She was positioned in candy cane stirrups. which nerve was injured?
a. common peroneal
b. obturator
c. saphenous
d. femoral

A

a. common peroneal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The etiology of obturator injury is

A

flexion of the thigh towards the groin
excessive traction during abdominal surgery
forceps delivery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Obturator injury presents with

A

an inability to ADDuct the leg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Etiology of femoral injury is

A

excessive traction during lower abdominal surgery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Femoral injury presents with

A

impaired knee extension and hip flexion as well as reduced sensation over the anterior thigh and anteromedial aspect of the leg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Saphenous injury etiology is

A

external pressure applied to the medial aspect of the leg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Saphenous injury presents with

A

reduced sensation over the anteromedial aspect of the leg (just like femoral n. injury)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Etiology of common peroneal injury

A

external pressure at the level of the fibular head (common in the lithotomy position)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Common peroneal nerve injury presents as

A

foot drop and the inability to ever the foot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Etiology of sciatic injury is

A

excessive hip flexion and external rotation of the legs in the lithotomy position
sitting with straight legs

24
Q

Patients with sciatic injury present with

A

foot drop

25
Q

Etiology of pudendal injury is

A

the nerve is compressed against a perineal post on an orthopedic fracture table

26
Q

Patients with pudendal injury present with

A

loss of perineal sensation

27
Q

Leaving the patient’s legs crossed during surgery increases the risk of

A

sural nerve injury in the top leg and superficial peroneal injury in the bottom leg

28
Q

Prevention of obturator nerve injury includes

A

minimizing hip flexion

29
Q

Prevention of femoral injury includes

A

the surgical team should avoid excessive traction during lower abdominal surgery

30
Q

Prevention of saphenous nerve injury includes

A

placing padding between leg and stirrup

31
Q

Prevention of common peroneal injury includes

A

placing padding between the leg and stirrup
pad under the fibular head
knees should be flexed with minimal rotation

32
Q

Prevention of sciatic injury includes

A

ample padding under buttocks
avoid excessive external rotation of the hips
flex table at the knees

33
Q

Prevention of pudendal injury includes

A

adequate padding between the perineal post and the patient

34
Q

Which complications are MOST commonly associated with the sitting position? (select 2)
a. tracheobronchial compression
b. midcervical tetraplegia
c. lower extremity compartment syndrome
d. paradoxical air embolism

A

b. midcervical tetraplegia
d. paradoxical air embolism

35
Q

Compartment syndrome is most commonly seen in the

A

lithotomy position

36
Q

Compartment syndrome can progress to

A

rhabdomyolysis or reperfusion injury

37
Q

___________ is the treatment for compartment syndrome

A

Fasciotomy

38
Q

This position is most commonly associated with VAE

A

the sitting position

39
Q

VAE can occur in any position that produces

A

a pressure gradient between the atmosphere and the veins at the surgical site

40
Q

Midcervical tetraplegia is associated with

A

hyperflexion of the neck (chin to chest)

41
Q

Midcervical tetraplegia occurs in the __________ position and can also occur postoperatively in patients who have undergone ___________

A

sitting; tracheal resection

42
Q

When compared to the Wilson frame and chest rolls, the ______________ is the best option to preserve normal pulmonary mechanics in prone patients (compliance is better and PIP is lower).

A

Jackson table

43
Q

The _________ position provides optimal V/Q matching which explains its use for ARDS patients

A

prone

44
Q

In the patient with a mediastinal mass, there are three things that worse tracheobronchial compression (i.e. airway collapse):

A

supine position
induction of general anesthesia
loss of spontaneous ventilation

45
Q

When anesthetizing the patient with an anterior mediastinal mass, you should

A

preserve spontaneous ventilation and use a reinforced endotracheal tube

46
Q

If the airway collapses in the patient with a mediastinal mass,

A

repositioning the patient laterally or prone may restore airway patency

47
Q

Risk factors for lower extremity compartment syndrome include

A

surgical time >2-3 hours
Increased BMI
decreased tissue oxygenation (hypotension)

48
Q

What is a venous air embolism?

A

VAE–> right heart–> pulmonary vasculature–> increased dead space and increased RV workload

49
Q

What is a paradoxical air embolism?

A

right heart–> patent foramen ovale–> left heart–> systemic circulation–> stroke

50
Q

In the supine position, ______________ of the lumbar spine can cause paraplegia

A

extreme hyperextension

51
Q

Risk factors for paraplegia include

A

maximal retroflexion of the OR table
raising the kidney rest to its highest position
placing large rolls under the patient’s lumbar spine

52
Q

When positioning the patient for surgery, you should be able to place __________________ in-between the chin and the chest

A

at least 2 fingers to prevent midcervical tetraplegia

53
Q

The tumors likely to occur in the anterior mediastinum include

A

the four T’s
1. thymoma
2. teratoma
3. thyroid
4. terrible lympoma

54
Q

A tumor of the anterior mediastinum can compress three vital structures:

A

tracheobronchial tree
pulmonary artery
superior vena cava

55
Q

What action can help improve comfort in a supine patient with a history of back pain?

A

placing a small pad under the lumbar spine to preserve lordosis