Abstract
Though the anatomy of most nerves is well understood, there are many variations in popularity of different selective nerve blocks in clinical practice despite the implementation of ultrasound technology. In this regard, iliohypogastric nerve, ilioinguinal nerve, genitofemoral nerve, and penile nerve blocks, though effective, are less often performed when compared with many other selective nerve blocks. Local pain, local anesthetic toxicity, bowel perforation, pelvic hematoma, hypotension, and subcutaneous hematoma are all potential complications, suggesting that precise technique and use of ultrasound are critical for consistent success without these type of side effects when providing these selective nerve blocks. Collectively, these blocks are valuable for a wide range of indications; however, an appreciation of anatomy and proper technique with ultrasound can improve efficacy and reduce potential side effects. In this regard, many groups have moved away from bupivacaine because of its potential toxicity with intravascular injection, while other groups still utilize bupivacaine, making good technique that is much more significant for ensuring best outcomes and patient safety.
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Review Questions
Review Questions
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1.
The primary nerve root supplying the ilioinguinal and iliohypogastric nerves is:
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(a)
L3
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(b)
L2
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(c)
L1
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(d)
T12
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(a)
-
2.
All the following are advantages of ilioinguinal and iliohypogastric blocks compared to spinal except:
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(a)
Quicker postoperative discharge
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(b)
Faster postoperative oral intake
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(c)
Less need for recovery room
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(d)
Less postoperative surgical complications
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(a)
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3.
The ilioinguinal nerve supplies sensation to all the following areas except:
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(a)
Skin covering the base of the penis
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(b)
Skin covering the upper scrotum
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(c)
Skin covering the mons pubis
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(d)
Skin covering the posterior aspect of the upper thigh
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(a)
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4.
The ilioinguinal and iliohypogastric nerves are commonly located between:
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(a)
The transverse abdominal muscle and the internal oblique muscle
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(b)
The internal oblique muscle and the external oblique muscle
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(c)
The transverse abdominal muscle and the rectus sheath
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(d)
The rectus sheath and aponeurosis of the external oblique muscle
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(a)
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5.
Continuous ilioinguinal and iliohypogastric blocks for Pfannenstiel incisions:
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(a)
Place catheter unilaterally
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(b)
Place bilateral catheters between the transverse abdominal and the internal oblique muscles
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(c)
Place bilateral catheters between the external and the internal oblique muscles
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(d)
Place bilateral catheters between the internal and the external oblique muscles aiming medially
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(a)
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6.
Complications to the ilioinguinal and iliohypogastric block include all except:
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(a)
Hemodynamic instability
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(b)
Bowel perforation
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(c)
Subcutaneous hematoma
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(d)
Pelvic hematoma
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(a)
-
7.
Indications for genitofemoral nerve block include all except:
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(a)
Supplemental block for hernia surgery
-
(b)
Aid in diagnosis of genitofemoral neuralgia
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(c)
Treatment of some chronic pelvic pain syndromes
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(d)
Primary block for orchiopexy surgery
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(a)
-
8.
The genitofemoral nerve originates from:
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(a)
Dorsal rami of T12 and L1
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(b)
Dorsal rami of L1 and L2
-
(c)
Ventral rami of L1 and L2
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(d)
Ventral rami of T12 and L1
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(a)
-
9.
The genital branch of the genitofemoral nerve:
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(a)
Enters the inguinal area through the deep ring
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(b)
Travels with the spermatic cord
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(c)
Supplies the cremaster and dartos muscles
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(d)
All of the above
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(a)
-
10.
Anatomical landmarks used for ultrasound block of the genital branch include all except:
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(a)
ASIS
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(b)
Umbilical button
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(c)
Inguinal ligament
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(d)
Quadriceps muscle
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(a)
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11.
Clinical pearls for genitofemoral block include all except:
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(a)
Use epinephrine mixed with local anesthetic
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(b)
Use multidirectional infiltration
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(c)
Sterile preparation extremely important
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(d)
Use local anesthetic without epinephrine
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(a)
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12.
Indications for penile block include:
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(a)
Cystoscopy
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(b)
Retrograde urethrogram
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(c)
Circumcision and distal hypospadias repair
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(d)
Testicular torsion
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(a)
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13.
Contraindications for penile block:
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(a)
Dorsal penile skin surgery
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(b)
Postoperative analgesia for penile surgery
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(c)
Penile skin infection
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(d)
Phimosis surgery
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(a)
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14.
All of the following concerning the penile nerve are true except:
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(a)
Derived from S2–4
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(b)
Courses under the pubic symphysis
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(c)
Travels under Buck’s fascia
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(d)
Blocked with local anesthetic containing epinephrine
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(a)
-
15.
Complications from penile block:
-
(a)
Inadequate block
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(b)
Penile ischemia is common
-
(c)
Hematomas are rare
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(d)
Local anesthetic toxicity from large-volume doses
-
(a)
Answers
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1.
c
-
2.
d
-
3.
d
-
4.
a
-
5.
b
-
6.
a
-
7.
d
-
8.
c
-
9.
d
-
10.
d
-
11.
a
-
12.
c
-
13.
c
-
14.
d
-
15.
b
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Yan, H., Kaye, A.D., Liu, H. (2018). Selective Regional Anesthesia Options in Surgical Subspecialties. In: Kaye, A., Urman, R., Vadivelu, N. (eds) Essentials of Regional Anesthesia. Springer, Cham. https://doi.org/10.1007/978-3-319-74838-2_20
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