Oculocardiac reflex
| A peculiarity of ophthalmic anaesthesia but also possible in entrapment after orbital floor fracture | |
|---|---|
| Stimulus | pressure or traction on eyeball |
| Afferent | CN V (ciliary nerves) → ciliary ganglion → Gasserion ganglion → trigeminal nucleus |
| Efferent | vagus nerve → SA node |
| Response | ↑ vagal tone |
| Net effect | Bradycardia/AV block |
anaesthetic considerations
- Effect increased by:
- TIVA
- dexmed
- hypoxia, hypercarbia