A course of VISUDYNE (verteporfin for injection) therapy is a two-step process
requiring administration of both drug and light.
The first step is the intravenous infusion of VISUDYNE. The second step is
the activation of VISUDYNE with light from a nonthermal diode laser.
The physician should re-evaluate the patient every 3 months and if choroidal
neovascular leakage is detected on fluorescein angiography, therapy should be
repeated.
Lesion Size Determination
The greatest linear dimension (GLD) of the lesion is estimated by fluorescein
angiography and color fundus photography. All classic and occult CNV, blood
and/or blocked fluorescence, and any serous detachments of the retinal pigment
epithelium should be included for this measurement. Fundus cameras with magnification
within the range of 2.4-2.6X are recommended. The GLD of the lesion on the fluorescein
angiogram must be corrected for the magnification of the fundus camera to obtain
the GLD of the lesion on the retina.
Spot Size Determination
The treatment spot size should be 1000 microns larger than the GLD of the lesion
on the retina to allow a 500 micron border, ensuring full coverage of the lesion.
The maximum spot size used in the clinical trials was 6400 microns.
The nasal edge of the treatment spot must be positioned at least 200 microns
from the temporal edge of the optic disc, even if this will result in lack of
photoactivation of CNV within 200 microns of the optic nerve.
VISUDYNE Administration
Reconstitute each vial of VISUDYNE with 7 mL of sterile Water for Injection
to provide 7.5 mL containing 2 mg/mL. Reconstituted VISUDYNE must be protected
from light and used within 4 hours. It is recommended that reconstituted VISUDYNE
be inspected visually for particulate matter and discoloration prior to administration.
Reconstituted VISUDYNE is an opaque dark green solution. VISUDYNE may precipitate
in saline solutions. Do not use normal saline or other parenteral solutions.
Do not mix VISUDYNE in the same solution with other drugs.
The volume of reconstituted VISUDYNE required to achieve the desired dose of
6 mg/m² body surface area is withdrawn from the vial and diluted with 5%
Dextrose for Injection to a total infusion volume of 30 mL. After dilution,
protect from light and use within a maximum of 4 hours. The full infusion volume
is administered intravenously over 10 minutes at a rate of 3 mL/minute, using
an appropriate syringe pump and in-line filter. The clinical studies were conducted
using a standard infusion line filter of 1.2 microns.
Precautions should be taken to prevent extravasation at the injection site.
If extravasation occurs, protect the site from light (See PRECAUTIONS).
Light Administration
Initiate 689 nm wavelength laser light delivery to the patient 15 minutes after
the start of the 10-minute infusion with VISUDYNE.
Photoactivation of VISUDYNE is controlled by the total light dose delivered.
In the treatment of choroidal neovascularization, the recommended light dose
is 50 J/cm² of neovascular lesion administered at an intensity of 600 mW/cm².
This dose is administered over 83 seconds.
Light dose, light intensity, ophthalmic lens magnification factor and zoom
lens setting are important parameters for the appropriate delivery of light
to the predetermined treatment spot. Follow the laser system manuals for procedure
set up and operation.
The laser system must deliver a stable power output at a wavelength of 689±3
nm. Light is delivered to the retina as a single circular spot via a fiber optic
and a slit lamp, using a suitable ophthalmic magnification lens.
The following laser systems have been tested for compatibility with VISUDYNE
and are approved for delivery of a stable power output at a wavelength of 689±3
nm:
Coherent Opal Photoactivator laser console and modified Coherent LaserLink
adapter, manufactured by Lumenis, Inc., 2400 Condensa Street, Santa Clara, CA
95051-0901,
Zeiss VISULAS 690s laser and VISULINK® PDT adapter manufactured by Carl
Zeiss Meditec Inc., 5160 Hacienda Drive, Dublin, CA 94568,
Ceralas I laser system and Ceralink Slit Lamp Adapter manufactured by Biolitec
Inc., 515 Shaker Road, East Longmeadow, MA 01028,
Quantel Activis laser console and the ZSL30 ACTTM, ZSL120 ACTTM and HSBMBQ
ACTTM slit lamp adapters distributed by Quantel Medical, 601 Haggerty Lane,
Bozeman, MT 59715.
Concurrent Bilateral Treatment
The controlled trials only allowed treatment of one eye per patient. In patients
who present with eligible lesions in both eyes, physicians should evaluate the
potential benefits and risks of treating both eyes concurrently. If the patient
has already received previous Visudyne therapy in one eye with an acceptable
safety profile, both eyes can be treated concurrently after a single administration
of VISUDYNE. The more aggressive lesion should be treated first, at 15 minutes
after the start of infusion. Immediately at the end of light application to
the first eye, the laser settings should be adjusted to introduce the treatment
parameters for the second eye, with the same light dose and intensity as for
the first eye, starting no later than 20 minutes from the start of infusion.
In patients who present for the first time with eligible lesions in both eyes
without prior Visudyne therapy, it is prudent to treat only one eye (the most
aggressive lesion) at the first course. One week after the first course, if
no significant safety issues are identified, the second eye can be treated using
the same treatment regimen after a second VISUDYNE infusion. Approximately 3
months later, both eyes can be evaluated and concurrent treatment following
a new VISUDYNE infusion can be started if both lesions still show evidence of
leakage.