Retrobulbar and Airway Block Flashcards
What is responsible for the oculocardiac reflex?
Trigeminal-Vagal reflex is responsible for the efferent pathway of the oculocardiac reflex
How much LA do you inject for a peribulbar block?
You aspirate then inject 8-10ml of LA
How much LA do you inject for a retrobulbar block?
You aspirate then inject 2-5 ml of LA
What is the most common complication for regional anesthesia for ophthalmic surgery?
Superficial or retrobulbar hemorrhage
What is normal intraocular pressure?
10 to 22 mm Hg
What is the most important determinant of intraocular pressure?
The aqueous humor production and elimination balance
Venous drainage from the eyes are continuous to the heart because of the lack of what?
Venous drainage from the eyes are continuous to the heart without any valves
Lateral Rectus is innervated by what cranial nerve?
Lateral rectus is cranial never VI (abducens)
LR 6
SO 4
AO 3
Superior oblique is innervated by what cranial nerve?
Superior oblique is innervated by cranial nerve IV (Trochlear)
LR 6
SO 4
AO 3
Superior Rectus, Inferior Rectus, Medial rectus, and Inferior Oblique are innervated by what cranial nerve?
All others are innervated by cranial nerve III (oculomotor)
LR 6
SO 4
AO 3
Blocking which nerve will give block your gag reflex?
(IX) GlossophArynGeal will block gag
Which cranial nerve provides sensation below the vocal cords?
Recurrent laryngeal nerve
Which branch and cranial nerve provides sensory above the vocal cords?
Internal branch of the superior laryngeal nerve
How would find the superior laryngeal nerve for a block?
The laryngeal structures are above the vocal cords.
Inferior to the cornu of hyoid bone**
contact the bone and walk off inferiorly
How much LA would you use for a recurrent laryngeal nerve block?
On inspiration, inject 3-5ml through cricothyroid membrane
