|
Section 7 Management
of New Vessels Elsewhere
(NVE) (for a larger view of the retina please click the picture) |
||
7.1 Definition NVE are defined as any abnormal collection of leaking vessels occurring on retina more than one disc diameter from the rim of the optic disc. They normally occur in the post-equatorial retina with a predilection for the vascular arcades. However, NVE in the nasal retina also occur and may be easily missed. Untreated NVE in particular are associated with tractional retinal detachment, hence the importance of their early detection and treatment. . 7.2 Treatment of NVE Treatment is the same as for NVD ie by pan-retinal photocoagulation (PRP). Areas of retinal ischaemia as determined by fluorescein angiography should be preferentially treated and a more peripheral application of laser burns helps to preserve more of the visual field, while being equally effective. . 7.2.1 Early NVE Early NVE responds to a basic PRP as NVD (see above (Figs 23a and b) . 7.2.2 Progressive NVE NVE may present as relatively advanced abnormal vascular structures (Figure 11) which require a full PRP which particular attention being paid to the areas of ischaemic retina in the proximity of the NVE (Figure 24a and b). . 7.2.3 Florid NVE NVE may develop rapidly and in more than one site (Figure 12 and 23). This condition required aggressive management as for florid NVD, attention being paid to the regions of ischaemic retina. . 7.2.4 Non-responding NVE On occasion, NVE may not fully respond to PRP and persist as foci of leaking vessels. Attempts should be made to close down such vessels with the application of further laser, particularly around the vicinities of the NVE, in a series of short focal applications. The active vessels should be monitored every 2-3 weeks. . 7.2.5 NVE with gliosis NVE particularly on the vascular arcades may form firm vitreoretinal adhesions which promote the development of gliosis (Figure 25). Such lesions may act as the focus for traction on the retina which, if treated too aggressively with laser therapy, may develop retinal holes and lead to rhegmatogenous retinal detachment. Application of the laser some distance from the site of the gliotic NVE may help to induce regression of the new vessels. If the condition progresses however, for instance with vitreous hemorrhage or retinal detachment, vitrectomy may be required.
. 7.2.6 NVE with vitreous haemorrhage NVE are frequently the cause of vitreous haemorrhage but the site of bleeding may be masked by the blood (Figure 18). NVE may be tracked to the point or tip of a subhyaloid haemorrhage. NVE with vitreous haemorrhage should be treated as for NVE with vitreous haemorrhage. |
|||
|