Rhegmatogenous Detachment Flashcards
Why does a rheg detachment occur?
Because of the formation of a break in the retinal tissue which leads to an influx of vitreous fluid under the retina in the subretinal space
Where is the subretinal space?
It separates the retina from the RPE
What is needed for a rheg to occur?
A tear or a break
What causes the break in a rheg?
The tension between the detaching vit and the ILM which causes the retina to tear
What is the percentage of px with PVD’s that get a rheg detachment?
7-13% of acute and symptomatics
What increases the risk of developing a rheg?
A PVD with complications such as PVD with vit haemorrhage
What is the main concern with PVD’s?
The chance of a break or a tear
What shape does retinal tear demonstrate?
Horseshoe or U shape
What indicates detachment has taken place?
Cloudy white borders
What is the treatment of a retinal break?
Prophylactic treatment with laser or cryotherapy which protects against detachment. The aim is to freeze or burn the retinal tissue around the break in which the scarring leads to sealing the retina in place reducing the progression of a detachment which is a poorer prognosis than just a break
What happens to the influx of fluid during a rheg?
It accumulates in the subretinal space which increases the seperation between the vit and retina
What is the incidence of rheg detachments? (%)
6.3-11.3/100000
Briefly describe the risk factors of rheg detachment
Fellow eye affected, family history, PVD, age, myopia, trauma,
Explain why PVD is a risk factor for rheg
Having acute and symptomatic PVD with a sudden onset is more likely to lead to a detachment. The tension between the post vit and ILM can be sufficient enough to cause a tear or break and the greater the tension, the higher the risk.
Tears are more likely to develop across strong attachments and with PVD’s that have been complicated with haemorrhages because if the tension is high enough to cause a haemorrhage then it’s high enough to cause a break. PVD’s which are incomplete due to strong attachments increase the risk. Incomplete focuses tension on a specific area which increases the force and increases the chance of a break
Explain why age is a risk factor for rheg
Rheg requires an influx of fluid to separate the retina and the more advanced liquidation then the greater the risk of enough fluid to cause a detachment. Age increases the risk of rheg by increasing the fluid and age also leads to an increase risk of PVD