Ophthalmic Surgery Flashcards
1
Q
what determines intraocular pressure? (3)
A
- extrinsic pressure
- scleral rigidity
- alteration of intraocular contents
2
Q
what are most important in determining intraocular pressure?
A
rate of formation and drainage
3
Q
what can increase intraocular pressure? (4)
A
- acute HTN
- hypoxia
- hypercarbia
- succinylcholine
4
Q
what can decrease intraocular pressure? (7)
A
- inhalation anesthetics
- CNS depressants
- non-depolarizing NMB
- hyperventilation
- hypothermia
- ganglionic blockers
- diuretics
5
Q
what are the afferent and efferent nerves in the oculocardiac reflex?
A
afferent - trigeminal
efferent - vagus
6
Q
what can cause oculocardiac reflex?
A
- pressure on globe
- retrobulbar block
- pressure on orbital contents after enucleation
- traction on EOM
- ocular trauma
7
Q
what effects come via the oculocardiac reflex?
A
- bradycardia
- v-tach
- v-fib
- sinus arrest
- asystole
