Pregnancies are considered appropriate for laser photocoagulation in TTTS when they have the following:
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Single placenta (Monochorionic)
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Excess fluid (Polyhydramnios) present in recipient twin
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Low fluid (Oligohydramnios) present in donor twin
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Prominent bladder in the recipient twin and an absent or small bladder in the donor twin
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Thin dividing membrane between the twins
Patients with the following situations may not be suitable for laser photocoagulation in TTTS:
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Pre-term labor with a short or open cervix
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Prior septostomy (procedure described under alternative treatments)
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Abnormal genetic studies
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Ruptured membranes
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Infection of the amniotic fluid (Chorioamnionitis)